2 * libev event processing core, watcher management
4 * Copyright (c) 2007,2008,2009,2010,2011 Marc Alexander Lehmann <libev@schmorp.de>
7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met:
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26 * OF THE POSSIBILITY OF SUCH DAMAGE.
28 * Alternatively, the contents of this file may be used under the terms of
29 * the GNU General Public License ("GPL") version 2 or any later version,
30 * in which case the provisions of the GPL are applicable instead of
31 * the above. If you wish to allow the use of your version of this file
32 * only under the terms of the GPL and not to allow others to use your
33 * version of this file under the BSD license, indicate your decision
34 * by deleting the provisions above and replace them with the notice
35 * and other provisions required by the GPL. If you do not delete the
36 * provisions above, a recipient may use your version of this file under
37 * either the BSD or the GPL.
40 /* this big block deduces configuration from config.h */
50 # define EV_USE_FLOOR 1
54 # if HAVE_CLOCK_SYSCALL
55 # ifndef EV_USE_CLOCK_SYSCALL
56 # define EV_USE_CLOCK_SYSCALL 1
57 # ifndef EV_USE_REALTIME
58 # define EV_USE_REALTIME 0
60 # ifndef EV_USE_MONOTONIC
61 # define EV_USE_MONOTONIC 1
64 # elif !defined(EV_USE_CLOCK_SYSCALL)
65 # define EV_USE_CLOCK_SYSCALL 0
68 # if HAVE_CLOCK_GETTIME
69 # ifndef EV_USE_MONOTONIC
70 # define EV_USE_MONOTONIC 1
72 # ifndef EV_USE_REALTIME
73 # define EV_USE_REALTIME 0
76 # ifndef EV_USE_MONOTONIC
77 # define EV_USE_MONOTONIC 0
79 # ifndef EV_USE_REALTIME
80 # define EV_USE_REALTIME 0
85 # ifndef EV_USE_NANOSLEEP
86 # define EV_USE_NANOSLEEP EV_FEATURE_OS
89 # undef EV_USE_NANOSLEEP
90 # define EV_USE_NANOSLEEP 0
93 # if HAVE_SELECT && HAVE_SYS_SELECT_H
94 # ifndef EV_USE_SELECT
95 # define EV_USE_SELECT EV_FEATURE_BACKENDS
99 # define EV_USE_SELECT 0
102 # if HAVE_POLL && HAVE_POLL_H
104 # define EV_USE_POLL EV_FEATURE_BACKENDS
108 # define EV_USE_POLL 0
111 # if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
112 # ifndef EV_USE_EPOLL
113 # define EV_USE_EPOLL EV_FEATURE_BACKENDS
117 # define EV_USE_EPOLL 0
120 # if HAVE_KQUEUE && HAVE_SYS_EVENT_H
121 # ifndef EV_USE_KQUEUE
122 # define EV_USE_KQUEUE EV_FEATURE_BACKENDS
125 # undef EV_USE_KQUEUE
126 # define EV_USE_KQUEUE 0
129 # if HAVE_PORT_H && HAVE_PORT_CREATE
131 # define EV_USE_PORT EV_FEATURE_BACKENDS
135 # define EV_USE_PORT 0
138 # if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
139 # ifndef EV_USE_INOTIFY
140 # define EV_USE_INOTIFY EV_FEATURE_OS
143 # undef EV_USE_INOTIFY
144 # define EV_USE_INOTIFY 0
147 # if HAVE_SIGNALFD && HAVE_SYS_SIGNALFD_H
148 # ifndef EV_USE_SIGNALFD
149 # define EV_USE_SIGNALFD EV_FEATURE_OS
152 # undef EV_USE_SIGNALFD
153 # define EV_USE_SIGNALFD 0
157 # ifndef EV_USE_EVENTFD
158 # define EV_USE_EVENTFD EV_FEATURE_OS
161 # undef EV_USE_EVENTFD
162 # define EV_USE_EVENTFD 0
176 #include <sys/types.h>
191 # include <sys/time.h>
192 # include <sys/wait.h>
196 # define WIN32_LEAN_AND_MEAN
197 # include <windows.h>
198 # ifndef EV_SELECT_IS_WINSOCKET
199 # define EV_SELECT_IS_WINSOCKET 1
201 # undef EV_AVOID_STDIO
204 /* OS X, in its infinite idiocy, actually HARDCODES
205 * a limit of 1024 into their select. Where people have brains,
206 * OS X engineers apparently have a vacuum. Or maybe they were
207 * ordered to have a vacuum, or they do anything for money.
208 * This might help. Or not.
210 #define _DARWIN_UNLIMITED_SELECT 1
212 /* this block tries to deduce configuration from header-defined symbols and defaults */
214 /* try to deduce the maximum number of signals on this platform */
215 #if defined (EV_NSIG)
216 /* use what's provided */
218 # define EV_NSIG (NSIG)
220 # define EV_NSIG (_NSIG)
221 #elif defined (SIGMAX)
222 # define EV_NSIG (SIGMAX+1)
223 #elif defined (SIG_MAX)
224 # define EV_NSIG (SIG_MAX+1)
225 #elif defined (_SIG_MAX)
226 # define EV_NSIG (_SIG_MAX+1)
227 #elif defined (MAXSIG)
228 # define EV_NSIG (MAXSIG+1)
229 #elif defined (MAX_SIG)
230 # define EV_NSIG (MAX_SIG+1)
231 #elif defined (SIGARRAYSIZE)
232 # define EV_NSIG (SIGARRAYSIZE) /* Assume ary[SIGARRAYSIZE] */
233 #elif defined (_sys_nsig)
234 # define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
236 # error "unable to find value for NSIG, please report"
237 /* to make it compile regardless, just remove the above line, */
238 /* but consider reporting it, too! :) */
243 # define EV_USE_FLOOR 0
246 #ifndef EV_USE_CLOCK_SYSCALL
247 # if __linux && __GLIBC__ >= 2
248 # define EV_USE_CLOCK_SYSCALL EV_FEATURE_OS
250 # define EV_USE_CLOCK_SYSCALL 0
254 #ifndef EV_USE_MONOTONIC
255 # if defined (_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
256 # define EV_USE_MONOTONIC EV_FEATURE_OS
258 # define EV_USE_MONOTONIC 0
262 #ifndef EV_USE_REALTIME
263 # define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
266 #ifndef EV_USE_NANOSLEEP
267 # if _POSIX_C_SOURCE >= 199309L
268 # define EV_USE_NANOSLEEP EV_FEATURE_OS
270 # define EV_USE_NANOSLEEP 0
274 #ifndef EV_USE_SELECT
275 # define EV_USE_SELECT EV_FEATURE_BACKENDS
280 # define EV_USE_POLL 0
282 # define EV_USE_POLL EV_FEATURE_BACKENDS
287 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
288 # define EV_USE_EPOLL EV_FEATURE_BACKENDS
290 # define EV_USE_EPOLL 0
294 #ifndef EV_USE_KQUEUE
295 # define EV_USE_KQUEUE 0
299 # define EV_USE_PORT 0
302 #ifndef EV_USE_INOTIFY
303 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
304 # define EV_USE_INOTIFY EV_FEATURE_OS
306 # define EV_USE_INOTIFY 0
310 #ifndef EV_PID_HASHSIZE
311 # define EV_PID_HASHSIZE EV_FEATURE_DATA ? 16 : 1
314 #ifndef EV_INOTIFY_HASHSIZE
315 # define EV_INOTIFY_HASHSIZE EV_FEATURE_DATA ? 16 : 1
318 #ifndef EV_USE_EVENTFD
319 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
320 # define EV_USE_EVENTFD EV_FEATURE_OS
322 # define EV_USE_EVENTFD 0
326 #ifndef EV_USE_SIGNALFD
327 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
328 # define EV_USE_SIGNALFD EV_FEATURE_OS
330 # define EV_USE_SIGNALFD 0
334 #if 0 /* debugging */
336 # define EV_USE_4HEAP 1
337 # define EV_HEAP_CACHE_AT 1
341 # define EV_VERIFY (EV_FEATURE_API ? 1 : 0)
345 # define EV_USE_4HEAP EV_FEATURE_DATA
348 #ifndef EV_HEAP_CACHE_AT
349 # define EV_HEAP_CACHE_AT EV_FEATURE_DATA
352 /* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
353 /* which makes programs even slower. might work on other unices, too. */
354 #if EV_USE_CLOCK_SYSCALL
355 # include <syscall.h>
356 # ifdef SYS_clock_gettime
357 # define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
358 # undef EV_USE_MONOTONIC
359 # define EV_USE_MONOTONIC 1
361 # undef EV_USE_CLOCK_SYSCALL
362 # define EV_USE_CLOCK_SYSCALL 0
366 /* this block fixes any misconfiguration where we know we run into trouble otherwise */
369 /* AIX has a completely broken poll.h header */
371 # define EV_USE_POLL 0
374 #ifndef CLOCK_MONOTONIC
375 # undef EV_USE_MONOTONIC
376 # define EV_USE_MONOTONIC 0
379 #ifndef CLOCK_REALTIME
380 # undef EV_USE_REALTIME
381 # define EV_USE_REALTIME 0
385 # undef EV_USE_INOTIFY
386 # define EV_USE_INOTIFY 0
389 #if !EV_USE_NANOSLEEP
390 /* hp-ux has it in sys/time.h, which we unconditionally include above */
391 # if !defined(_WIN32) && !defined(__hpux)
392 # include <sys/select.h>
397 # include <sys/statfs.h>
398 # include <sys/inotify.h>
399 /* some very old inotify.h headers don't have IN_DONT_FOLLOW */
400 # ifndef IN_DONT_FOLLOW
401 # undef EV_USE_INOTIFY
402 # define EV_USE_INOTIFY 0
406 #if EV_SELECT_IS_WINSOCKET
407 # include <winsock.h>
411 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
413 # ifndef EFD_NONBLOCK
414 # define EFD_NONBLOCK O_NONBLOCK
418 # define EFD_CLOEXEC O_CLOEXEC
420 # define EFD_CLOEXEC 02000000
423 EV_CPP(extern "C") int (eventfd) (unsigned int initval, int flags);
427 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
429 # ifndef SFD_NONBLOCK
430 # define SFD_NONBLOCK O_NONBLOCK
434 # define SFD_CLOEXEC O_CLOEXEC
436 # define SFD_CLOEXEC 02000000
439 EV_CPP (extern "C") int signalfd (int fd, const sigset_t *mask, int flags);
441 struct signalfd_siginfo
444 char pad[128 - sizeof (uint32_t)];
451 # define EV_FREQUENT_CHECK ev_verify (EV_A)
453 # define EV_FREQUENT_CHECK do { } while (0)
457 * This is used to work around floating point rounding problems.
458 * This value is good at least till the year 4000.
460 #define MIN_INTERVAL 0.0001220703125 /* 1/2**13, good till 4000 */
461 /*#define MIN_INTERVAL 0.00000095367431640625 /* 1/2**20, good till 2200 */
463 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
464 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
466 #define EV_TV_SET(tv,t) do { tv.tv_sec = (long)t; tv.tv_usec = (long)((t - tv.tv_sec) * 1e6); } while (0)
467 #define EV_TS_SET(ts,t) do { ts.tv_sec = (long)t; ts.tv_nsec = (long)((t - ts.tv_sec) * 1e9); } while (0)
469 /* the following are taken from libecb */
472 /* many compilers define _GNUC_ to some versions but then only implement
473 * what their idiot authors think are the "more important" extensions,
474 * causing enourmous grief in return for some better fake benchmark numbers.
476 * we try to detect these and simply assume they are not gcc - if they have
477 * an issue with that they should have done it right in the first place.
479 #ifndef ECB_GCC_VERSION
480 #if !defined(__GNUC_MINOR__) || defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__llvm__) || defined(__clang__)
481 #define ECB_GCC_VERSION(major,minor) 0
483 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
488 #define ecb_inline static inline
489 #elif ECB_GCC_VERSION(2,5)
490 #define ecb_inline static __inline__
492 #define ecb_inline static inline
494 #define ecb_inline static
497 #ifndef ECB_MEMORY_FENCE
498 #if ECB_GCC_VERSION(2,5)
500 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
501 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
502 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
504 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
505 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")
506 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence")
511 #ifndef ECB_MEMORY_FENCE
512 #if ECB_GCC_VERSION(4,4)
513 #define ECB_MEMORY_FENCE __sync_synchronize ()
514 #define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); })
515 #define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); })
516 #elif defined(_WIN32) && defined(MemoryBarrier)
517 #define ECB_MEMORY_FENCE MemoryBarrier ()
518 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
519 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
523 #ifndef ECB_MEMORY_FENCE
526 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
527 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
528 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
529 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
532 #if ECB_GCC_VERSION(3,1)
533 #define ecb_attribute(attrlist) __attribute__(attrlist)
534 #define ecb_is_constant(expr) __builtin_constant_p (expr)
535 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
536 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
538 #define ecb_attribute(attrlist)
539 #define ecb_is_constant(expr) 0
540 #define ecb_expect(expr,value) (expr)
541 #define ecb_prefetch(addr,rw,locality)
544 #define ecb_noinline ecb_attribute ((__noinline__))
545 #define ecb_noreturn ecb_attribute ((__noreturn__))
546 #define ecb_unused ecb_attribute ((__unused__))
547 #define ecb_const ecb_attribute ((__const__))
548 #define ecb_pure ecb_attribute ((__pure__))
550 #if ECB_GCC_VERSION(4,3)
551 #define ecb_artificial ecb_attribute ((__artificial__))
552 #define ecb_hot ecb_attribute ((__hot__))
553 #define ecb_cold ecb_attribute ((__cold__))
555 #define ecb_artificial
560 /* put around conditional expressions if you are very sure that the */
561 /* expression is mostly true or mostly false. note that these return */
562 /* booleans, not the expression. */
563 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
564 #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
567 #define expect_false(cond) ecb_expect_false (cond)
568 #define expect_true(cond) ecb_expect_true (cond)
569 #define noinline ecb_noinline
571 #define inline_size ecb_inline
574 # define inline_speed ecb_inline
576 # define inline_speed static noinline
579 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
581 #if EV_MINPRI == EV_MAXPRI
582 # define ABSPRI(w) (((W)w), 0)
584 # define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
587 #define EMPTY /* required for microsofts broken pseudo-c compiler */
588 #define EMPTY2(a,b) /* used to suppress some warnings */
590 typedef ev_watcher *W;
591 typedef ev_watcher_list *WL;
592 typedef ev_watcher_time *WT;
594 #define ev_active(w) ((W)(w))->active
595 #define ev_at(w) ((WT)(w))->at
598 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
599 /* giving it a reasonably high chance of working on typical architectures */
600 static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
604 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
607 #ifndef EV_FD_TO_WIN32_HANDLE
608 # define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
610 #ifndef EV_WIN32_HANDLE_TO_FD
611 # define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
613 #ifndef EV_WIN32_CLOSE_FD
614 # define EV_WIN32_CLOSE_FD(fd) close (fd)
618 # include "ev_win32.c"
621 /*****************************************************************************/
623 /* define a suitable floor function (only used by periodics atm) */
627 # define ev_floor(v) floor (v)
632 /* a floor() replacement function, should be independent of ev_tstamp type */
633 static ev_tstamp noinline
634 ev_floor (ev_tstamp v)
636 /* the choice of shift factor is not terribly important */
637 #if FLT_RADIX != 2 /* assume FLT_RADIX == 10 */
638 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 10000000000000000000. : 1000000000.;
640 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 18446744073709551616. : 4294967296.;
643 /* argument too large for an unsigned long? */
644 if (expect_false (v >= shift))
649 return v; /* very large number */
651 f = shift * ev_floor (v * (1. / shift));
652 return f + ev_floor (v - f);
655 /* special treatment for negative args? */
656 if (expect_false (v < 0.))
658 ev_tstamp f = -ev_floor (-v);
660 return f - (f == v ? 0 : 1);
663 /* fits into an unsigned long */
664 return (unsigned long)v;
669 /*****************************************************************************/
672 # include <sys/utsname.h>
675 static unsigned int noinline ecb_cold
676 ev_linux_version (void)
682 char *p = buf.release;
693 if (*p >= '0' && *p <= '9')
694 c = c * 10 + *p++ - '0';
711 /*****************************************************************************/
714 static void noinline ecb_cold
715 ev_printerr (const char *msg)
717 write (STDERR_FILENO, msg, strlen (msg));
721 static void (*syserr_cb)(const char *msg);
724 ev_set_syserr_cb (void (*cb)(const char *msg))
729 static void noinline ecb_cold
730 ev_syserr (const char *msg)
733 msg = "(libev) system error";
742 ev_printerr (strerror (errno));
752 ev_realloc_emul (void *ptr, long size)
755 return realloc (ptr, size);
757 /* some systems, notably openbsd and darwin, fail to properly
758 * implement realloc (x, 0) (as required by both ansi c-89 and
759 * the single unix specification, so work around them here.
763 return realloc (ptr, size);
770 static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
773 ev_set_allocator (void *(*cb)(void *ptr, long size))
779 ev_realloc (void *ptr, long size)
781 ptr = alloc (ptr, size);
786 ev_printerr ("(libev) memory allocation failed, aborting.\n");
788 fprintf (stderr, "(libev) cannot allocate %ld bytes, aborting.", size);
796 #define ev_malloc(size) ev_realloc (0, (size))
797 #define ev_free(ptr) ev_realloc ((ptr), 0)
799 /*****************************************************************************/
801 /* set in reify when reification needed */
802 #define EV_ANFD_REIFY 1
804 /* file descriptor info structure */
808 unsigned char events; /* the events watched for */
809 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
810 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
811 unsigned char unused;
813 unsigned int egen; /* generation counter to counter epoll bugs */
815 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
823 /* stores the pending event set for a given watcher */
827 int events; /* the pending event set for the given watcher */
831 /* hash table entry per inotify-id */
846 #define ANHE_w(he) (he).w /* access watcher, read-write */
847 #define ANHE_at(he) (he).at /* access cached at, read-only */
848 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
853 #define ANHE_w(he) (he)
854 #define ANHE_at(he) (he)->at
855 #define ANHE_at_cache(he)
863 #define ev_rt_now ((loop)->ev_rt_now)
864 #define VAR(name,decl) decl;
870 static struct ev_loop default_loop_struct;
871 struct ev_loop *ev_default_loop_ptr;
876 #define VAR(name,decl) static decl;
880 static int ev_default_loop_ptr;
885 # define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
886 # define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
887 # define EV_INVOKE_PENDING invoke_cb (EV_A)
889 # define EV_RELEASE_CB (void)0
890 # define EV_ACQUIRE_CB (void)0
891 # define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
894 #define EVBREAK_RECURSE 0x80
896 /*****************************************************************************/
898 #ifndef EV_HAVE_EV_TIME
903 if (expect_true (have_realtime))
906 clock_gettime (CLOCK_REALTIME, &ts);
907 return ts.tv_sec + ts.tv_nsec * 1e-9;
912 gettimeofday (&tv, 0);
913 return tv.tv_sec + tv.tv_usec * 1e-6;
917 inline_size ev_tstamp
921 if (expect_true (have_monotonic))
924 clock_gettime (CLOCK_MONOTONIC, &ts);
925 return ts.tv_sec + ts.tv_nsec * 1e-9;
941 ev_sleep (ev_tstamp delay)
948 EV_TS_SET (ts, delay);
950 #elif defined(_WIN32)
951 Sleep ((unsigned long)(delay * 1e3));
955 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
956 /* something not guaranteed by newer posix versions, but guaranteed */
958 EV_TV_SET (tv, delay);
959 select (0, 0, 0, 0, &tv);
964 /*****************************************************************************/
966 #define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
968 /* find a suitable new size for the given array, */
969 /* hopefully by rounding to a nice-to-malloc size */
971 array_nextsize (int elem, int cur, int cnt)
979 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
980 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
983 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
984 ncur = ncur - sizeof (void *) * 4;
991 static void * noinline ecb_cold
992 array_realloc (int elem, void *base, int *cur, int cnt)
994 *cur = array_nextsize (elem, *cur, cnt);
995 return ev_realloc (base, elem * *cur);
998 #define array_init_zero(base,count) \
999 memset ((void *)(base), 0, sizeof (*(base)) * (count))
1001 #define array_needsize(type,base,cur,cnt,init) \
1002 if (expect_false ((cnt) > (cur))) \
1004 int ecb_unused ocur_ = (cur); \
1005 (base) = (type *)array_realloc \
1006 (sizeof (type), (base), &(cur), (cnt)); \
1007 init ((base) + (ocur_), (cur) - ocur_); \
1011 #define array_slim(type,stem) \
1012 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
1014 stem ## max = array_roundsize (stem ## cnt >> 1); \
1015 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
1016 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
1020 #define array_free(stem, idx) \
1021 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
1023 /*****************************************************************************/
1025 /* dummy callback for pending events */
1026 static void noinline
1027 pendingcb (EV_P_ ev_prepare *w, int revents)
1032 ev_feed_event (EV_P_ void *w, int revents)
1035 int pri = ABSPRI (w_);
1037 if (expect_false (w_->pending))
1038 pendings [pri][w_->pending - 1].events |= revents;
1041 w_->pending = ++pendingcnt [pri];
1042 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
1043 pendings [pri][w_->pending - 1].w = w_;
1044 pendings [pri][w_->pending - 1].events = revents;
1049 feed_reverse (EV_P_ W w)
1051 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
1052 rfeeds [rfeedcnt++] = w;
1056 feed_reverse_done (EV_P_ int revents)
1059 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
1064 queue_events (EV_P_ W *events, int eventcnt, int type)
1068 for (i = 0; i < eventcnt; ++i)
1069 ev_feed_event (EV_A_ events [i], type);
1072 /*****************************************************************************/
1075 fd_event_nocheck (EV_P_ int fd, int revents)
1077 ANFD *anfd = anfds + fd;
1080 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1082 int ev = w->events & revents;
1085 ev_feed_event (EV_A_ (W)w, ev);
1089 /* do not submit kernel events for fds that have reify set */
1090 /* because that means they changed while we were polling for new events */
1092 fd_event (EV_P_ int fd, int revents)
1094 ANFD *anfd = anfds + fd;
1096 if (expect_true (!anfd->reify))
1097 fd_event_nocheck (EV_A_ fd, revents);
1101 ev_feed_fd_event (EV_P_ int fd, int revents)
1103 if (fd >= 0 && fd < anfdmax)
1104 fd_event_nocheck (EV_A_ fd, revents);
1107 /* make sure the external fd watch events are in-sync */
1108 /* with the kernel/libev internal state */
1114 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1115 for (i = 0; i < fdchangecnt; ++i)
1117 int fd = fdchanges [i];
1118 ANFD *anfd = anfds + fd;
1120 if (anfd->reify & EV__IOFDSET && anfd->head)
1122 SOCKET handle = EV_FD_TO_WIN32_HANDLE (fd);
1124 if (handle != anfd->handle)
1128 assert (("libev: only socket fds supported in this configuration", ioctlsocket (handle, FIONREAD, &arg) == 0));
1130 /* handle changed, but fd didn't - we need to do it in two steps */
1131 backend_modify (EV_A_ fd, anfd->events, 0);
1133 anfd->handle = handle;
1139 for (i = 0; i < fdchangecnt; ++i)
1141 int fd = fdchanges [i];
1142 ANFD *anfd = anfds + fd;
1145 unsigned char o_events = anfd->events;
1146 unsigned char o_reify = anfd->reify;
1150 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
1154 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1155 anfd->events |= (unsigned char)w->events;
1157 if (o_events != anfd->events)
1158 o_reify = EV__IOFDSET; /* actually |= */
1161 if (o_reify & EV__IOFDSET)
1162 backend_modify (EV_A_ fd, o_events, anfd->events);
1168 /* something about the given fd changed */
1170 fd_change (EV_P_ int fd, int flags)
1172 unsigned char reify = anfds [fd].reify;
1173 anfds [fd].reify |= flags;
1175 if (expect_true (!reify))
1178 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
1179 fdchanges [fdchangecnt - 1] = fd;
1183 /* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
1184 inline_speed void ecb_cold
1185 fd_kill (EV_P_ int fd)
1189 while ((w = (ev_io *)anfds [fd].head))
1191 ev_io_stop (EV_A_ w);
1192 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
1196 /* check whether the given fd is actually valid, for error recovery */
1197 inline_size int ecb_cold
1201 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
1203 return fcntl (fd, F_GETFD) != -1;
1207 /* called on EBADF to verify fds */
1208 static void noinline ecb_cold
1213 for (fd = 0; fd < anfdmax; ++fd)
1214 if (anfds [fd].events)
1215 if (!fd_valid (fd) && errno == EBADF)
1219 /* called on ENOMEM in select/poll to kill some fds and retry */
1220 static void noinline ecb_cold
1225 for (fd = anfdmax; fd--; )
1226 if (anfds [fd].events)
1233 /* usually called after fork if backend needs to re-arm all fds from scratch */
1234 static void noinline
1239 for (fd = 0; fd < anfdmax; ++fd)
1240 if (anfds [fd].events)
1242 anfds [fd].events = 0;
1243 anfds [fd].emask = 0;
1244 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
1248 /* used to prepare libev internal fd's */
1249 /* this is not fork-safe */
1254 unsigned long arg = 1;
1255 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
1257 fcntl (fd, F_SETFD, FD_CLOEXEC);
1258 fcntl (fd, F_SETFL, O_NONBLOCK);
1262 /*****************************************************************************/
1265 * the heap functions want a real array index. array index 0 is guaranteed to not
1266 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
1267 * the branching factor of the d-tree.
1271 * at the moment we allow libev the luxury of two heaps,
1272 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
1273 * which is more cache-efficient.
1274 * the difference is about 5% with 50000+ watchers.
1279 #define HEAP0 (DHEAP - 1) /* index of first element in heap */
1280 #define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
1281 #define UPHEAP_DONE(p,k) ((p) == (k))
1283 /* away from the root */
1285 downheap (ANHE *heap, int N, int k)
1288 ANHE *E = heap + N + HEAP0;
1294 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
1296 /* find minimum child */
1297 if (expect_true (pos + DHEAP - 1 < E))
1299 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1300 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1301 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1302 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1306 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1307 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1308 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1309 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1314 if (ANHE_at (he) <= minat)
1318 ev_active (ANHE_w (*minpos)) = k;
1324 ev_active (ANHE_w (he)) = k;
1330 #define HPARENT(k) ((k) >> 1)
1331 #define UPHEAP_DONE(p,k) (!(p))
1333 /* away from the root */
1335 downheap (ANHE *heap, int N, int k)
1346 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
1349 if (ANHE_at (he) <= ANHE_at (heap [c]))
1352 heap [k] = heap [c];
1353 ev_active (ANHE_w (heap [k])) = k;
1359 ev_active (ANHE_w (he)) = k;
1363 /* towards the root */
1365 upheap (ANHE *heap, int k)
1371 int p = HPARENT (k);
1373 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1376 heap [k] = heap [p];
1377 ev_active (ANHE_w (heap [k])) = k;
1382 ev_active (ANHE_w (he)) = k;
1385 /* move an element suitably so it is in a correct place */
1387 adjustheap (ANHE *heap, int N, int k)
1389 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
1392 downheap (heap, N, k);
1395 /* rebuild the heap: this function is used only once and executed rarely */
1397 reheap (ANHE *heap, int N)
1401 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1402 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1403 for (i = 0; i < N; ++i)
1404 upheap (heap, i + HEAP0);
1407 /*****************************************************************************/
1409 /* associate signal watchers to a signal signal */
1412 EV_ATOMIC_T pending;
1419 static ANSIG signals [EV_NSIG - 1];
1421 /*****************************************************************************/
1423 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1425 static void noinline ecb_cold
1428 if (!ev_is_active (&pipe_w))
1431 evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
1432 if (evfd < 0 && errno == EINVAL)
1433 evfd = eventfd (0, 0);
1438 fd_intern (evfd); /* doing it twice doesn't hurt */
1439 ev_io_set (&pipe_w, evfd, EV_READ);
1444 while (pipe (evpipe))
1445 ev_syserr ("(libev) error creating signal/async pipe");
1447 fd_intern (evpipe [0]);
1448 fd_intern (evpipe [1]);
1449 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1452 ev_io_start (EV_A_ &pipe_w);
1453 ev_unref (EV_A); /* watcher should not keep loop alive */
1458 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1460 if (expect_true (*flag))
1465 ECB_MEMORY_FENCE_RELEASE; /* make sure flag is visible before the wakeup */
1467 pipe_write_skipped = 1;
1469 ECB_MEMORY_FENCE; /* make sure pipe_write_skipped is visible before we check pipe_write_wanted */
1471 if (pipe_write_wanted)
1475 pipe_write_skipped = 0; /* just an optimsiation, no fence needed */
1477 old_errno = errno; /* save errno because write will clobber it */
1482 uint64_t counter = 1;
1483 write (evfd, &counter, sizeof (uint64_t));
1488 /* win32 people keep sending patches that change this write() to send() */
1489 /* and then run away. but send() is wrong, it wants a socket handle on win32 */
1490 /* so when you think this write should be a send instead, please find out */
1491 /* where your send() is from - it's definitely not the microsoft send, and */
1492 /* tell me. thank you. */
1493 write (evpipe [1], &(evpipe [1]), 1);
1500 /* called whenever the libev signal pipe */
1501 /* got some events (signal, async) */
1503 pipecb (EV_P_ ev_io *iow, int revents)
1507 if (revents & EV_READ)
1513 read (evfd, &counter, sizeof (uint64_t));
1519 /* see discussion in evpipe_write when you think this read should be recv in win32 */
1520 read (evpipe [0], &dummy, 1);
1524 pipe_write_skipped = 0;
1526 #if EV_SIGNAL_ENABLE
1531 for (i = EV_NSIG - 1; i--; )
1532 if (expect_false (signals [i].pending))
1533 ev_feed_signal_event (EV_A_ i + 1);
1542 for (i = asynccnt; i--; )
1543 if (asyncs [i]->sent)
1545 asyncs [i]->sent = 0;
1546 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1552 /*****************************************************************************/
1555 ev_feed_signal (int signum)
1558 EV_P = signals [signum - 1].loop;
1564 if (!ev_active (&pipe_w))
1567 signals [signum - 1].pending = 1;
1568 evpipe_write (EV_A_ &sig_pending);
1572 ev_sighandler (int signum)
1575 signal (signum, ev_sighandler);
1578 ev_feed_signal (signum);
1582 ev_feed_signal_event (EV_P_ int signum)
1586 if (expect_false (signum <= 0 || signum > EV_NSIG))
1592 /* it is permissible to try to feed a signal to the wrong loop */
1593 /* or, likely more useful, feeding a signal nobody is waiting for */
1595 if (expect_false (signals [signum].loop != EV_A))
1599 signals [signum].pending = 0;
1601 for (w = signals [signum].head; w; w = w->next)
1602 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1607 sigfdcb (EV_P_ ev_io *iow, int revents)
1609 struct signalfd_siginfo si[2], *sip; /* these structs are big */
1613 ssize_t res = read (sigfd, si, sizeof (si));
1615 /* not ISO-C, as res might be -1, but works with SuS */
1616 for (sip = si; (char *)sip < (char *)si + res; ++sip)
1617 ev_feed_signal_event (EV_A_ sip->ssi_signo);
1619 if (res < (ssize_t)sizeof (si))
1627 /*****************************************************************************/
1630 static WL childs [EV_PID_HASHSIZE];
1632 static ev_signal childev;
1634 #ifndef WIFCONTINUED
1635 # define WIFCONTINUED(status) 0
1638 /* handle a single child status event */
1640 child_reap (EV_P_ int chain, int pid, int status)
1643 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1645 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
1647 if ((w->pid == pid || !w->pid)
1648 && (!traced || (w->flags & 1)))
1650 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
1652 w->rstatus = status;
1653 ev_feed_event (EV_A_ (W)w, EV_CHILD);
1659 # define WCONTINUED 0
1662 /* called on sigchld etc., calls waitpid */
1664 childcb (EV_P_ ev_signal *sw, int revents)
1668 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1669 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1672 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1675 /* make sure we are called again until all children have been reaped */
1676 /* we need to do it this way so that the callback gets called before we continue */
1677 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1679 child_reap (EV_A_ pid, pid, status);
1680 if ((EV_PID_HASHSIZE) > 1)
1681 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1686 /*****************************************************************************/
1689 # include "ev_iocp.c"
1692 # include "ev_port.c"
1695 # include "ev_kqueue.c"
1698 # include "ev_epoll.c"
1701 # include "ev_poll.c"
1704 # include "ev_select.c"
1708 ev_version_major (void)
1710 return EV_VERSION_MAJOR;
1714 ev_version_minor (void)
1716 return EV_VERSION_MINOR;
1719 /* return true if we are running with elevated privileges and should ignore env variables */
1720 int inline_size ecb_cold
1721 enable_secure (void)
1726 return getuid () != geteuid ()
1727 || getgid () != getegid ();
1731 unsigned int ecb_cold
1732 ev_supported_backends (void)
1734 unsigned int flags = 0;
1736 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1737 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1738 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1739 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1740 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1745 unsigned int ecb_cold
1746 ev_recommended_backends (void)
1748 unsigned int flags = ev_supported_backends ();
1751 /* kqueue is borked on everything but netbsd apparently */
1752 /* it usually doesn't work correctly on anything but sockets and pipes */
1753 flags &= ~EVBACKEND_KQUEUE;
1756 /* only select works correctly on that "unix-certified" platform */
1757 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
1758 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
1761 flags &= ~EVBACKEND_POLL; /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
1767 unsigned int ecb_cold
1768 ev_embeddable_backends (void)
1770 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1772 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1773 if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
1774 flags &= ~EVBACKEND_EPOLL;
1799 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1801 io_blocktime = interval;
1805 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1807 timeout_blocktime = interval;
1811 ev_set_userdata (EV_P_ void *data)
1823 ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P))
1825 invoke_cb = invoke_pending_cb;
1829 ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P))
1831 release_cb = release;
1832 acquire_cb = acquire;
1836 /* initialise a loop structure, must be zero-initialised */
1837 static void noinline ecb_cold
1838 loop_init (EV_P_ unsigned int flags)
1849 if (!clock_gettime (CLOCK_REALTIME, &ts))
1854 #if EV_USE_MONOTONIC
1855 if (!have_monotonic)
1859 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1864 /* pid check not overridable via env */
1866 if (flags & EVFLAG_FORKCHECK)
1870 if (!(flags & EVFLAG_NOENV)
1871 && !enable_secure ()
1872 && getenv ("LIBEV_FLAGS"))
1873 flags = atoi (getenv ("LIBEV_FLAGS"));
1875 ev_rt_now = ev_time ();
1876 mn_now = get_clock ();
1878 rtmn_diff = ev_rt_now - mn_now;
1880 invoke_cb = ev_invoke_pending;
1884 timeout_blocktime = 0.;
1891 pipe_write_skipped = 0;
1892 pipe_write_wanted = 0;
1894 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
1897 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
1900 if (!(flags & EVBACKEND_MASK))
1901 flags |= ev_recommended_backends ();
1904 if (!backend && (flags & EVBACKEND_IOCP )) backend = iocp_init (EV_A_ flags);
1907 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1910 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1913 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1916 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1919 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1922 ev_prepare_init (&pending_w, pendingcb);
1924 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1925 ev_init (&pipe_w, pipecb);
1926 ev_set_priority (&pipe_w, EV_MAXPRI);
1931 /* free up a loop structure */
1933 ev_loop_destroy (EV_P)
1938 /* mimic free (0) */
1943 #if EV_CLEANUP_ENABLE
1944 /* queue cleanup watchers (and execute them) */
1945 if (expect_false (cleanupcnt))
1947 queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
1953 if (ev_is_active (&childev))
1955 ev_ref (EV_A); /* child watcher */
1956 ev_signal_stop (EV_A_ &childev);
1960 if (ev_is_active (&pipe_w))
1963 /*ev_io_stop (EV_A_ &pipe_w);*/
1970 if (evpipe [0] >= 0)
1972 EV_WIN32_CLOSE_FD (evpipe [0]);
1973 EV_WIN32_CLOSE_FD (evpipe [1]);
1978 if (ev_is_active (&sigfd_w))
1987 if (backend_fd >= 0)
1991 if (backend == EVBACKEND_IOCP ) iocp_destroy (EV_A);
1994 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1997 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
2000 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
2003 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
2006 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
2009 for (i = NUMPRI; i--; )
2011 array_free (pending, [i]);
2013 array_free (idle, [i]);
2017 ev_free (anfds); anfds = 0; anfdmax = 0;
2019 /* have to use the microsoft-never-gets-it-right macro */
2020 array_free (rfeed, EMPTY);
2021 array_free (fdchange, EMPTY);
2022 array_free (timer, EMPTY);
2023 #if EV_PERIODIC_ENABLE
2024 array_free (periodic, EMPTY);
2027 array_free (fork, EMPTY);
2029 #if EV_CLEANUP_ENABLE
2030 array_free (cleanup, EMPTY);
2032 array_free (prepare, EMPTY);
2033 array_free (check, EMPTY);
2035 array_free (async, EMPTY);
2041 if (ev_is_default_loop (EV_A))
2043 ev_default_loop_ptr = 0;
2051 inline_size void infy_fork (EV_P);
2058 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
2061 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
2064 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
2070 if (ev_is_active (&pipe_w))
2072 /* pipe_write_wanted must be false now, so modifying fd vars should be safe */
2075 ev_io_stop (EV_A_ &pipe_w);
2082 if (evpipe [0] >= 0)
2084 EV_WIN32_CLOSE_FD (evpipe [0]);
2085 EV_WIN32_CLOSE_FD (evpipe [1]);
2088 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2090 /* now iterate over everything, in case we missed something */
2091 pipecb (EV_A_ &pipe_w, EV_READ);
2100 struct ev_loop * ecb_cold
2101 ev_loop_new (unsigned int flags)
2103 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
2105 memset (EV_A, 0, sizeof (struct ev_loop));
2106 loop_init (EV_A_ flags);
2108 if (ev_backend (EV_A))
2115 #endif /* multiplicity */
2118 static void noinline ecb_cold
2119 verify_watcher (EV_P_ W w)
2121 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
2124 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
2127 static void noinline ecb_cold
2128 verify_heap (EV_P_ ANHE *heap, int N)
2132 for (i = HEAP0; i < N + HEAP0; ++i)
2134 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
2135 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
2136 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
2138 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
2142 static void noinline ecb_cold
2143 array_verify (EV_P_ W *ws, int cnt)
2147 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
2148 verify_watcher (EV_A_ ws [cnt]);
2161 assert (activecnt >= -1);
2163 assert (fdchangemax >= fdchangecnt);
2164 for (i = 0; i < fdchangecnt; ++i)
2165 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
2167 assert (anfdmax >= 0);
2168 for (i = 0; i < anfdmax; ++i)
2169 for (w = anfds [i].head; w; w = w->next)
2171 verify_watcher (EV_A_ (W)w);
2172 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
2173 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
2176 assert (timermax >= timercnt);
2177 verify_heap (EV_A_ timers, timercnt);
2179 #if EV_PERIODIC_ENABLE
2180 assert (periodicmax >= periodiccnt);
2181 verify_heap (EV_A_ periodics, periodiccnt);
2184 for (i = NUMPRI; i--; )
2186 assert (pendingmax [i] >= pendingcnt [i]);
2188 assert (idleall >= 0);
2189 assert (idlemax [i] >= idlecnt [i]);
2190 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
2195 assert (forkmax >= forkcnt);
2196 array_verify (EV_A_ (W *)forks, forkcnt);
2199 #if EV_CLEANUP_ENABLE
2200 assert (cleanupmax >= cleanupcnt);
2201 array_verify (EV_A_ (W *)cleanups, cleanupcnt);
2205 assert (asyncmax >= asynccnt);
2206 array_verify (EV_A_ (W *)asyncs, asynccnt);
2209 #if EV_PREPARE_ENABLE
2210 assert (preparemax >= preparecnt);
2211 array_verify (EV_A_ (W *)prepares, preparecnt);
2215 assert (checkmax >= checkcnt);
2216 array_verify (EV_A_ (W *)checks, checkcnt);
2221 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2222 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
2230 struct ev_loop * ecb_cold
2234 ev_default_loop (unsigned int flags)
2236 if (!ev_default_loop_ptr)
2239 EV_P = ev_default_loop_ptr = &default_loop_struct;
2241 ev_default_loop_ptr = 1;
2244 loop_init (EV_A_ flags);
2246 if (ev_backend (EV_A))
2249 ev_signal_init (&childev, childcb, SIGCHLD);
2250 ev_set_priority (&childev, EV_MAXPRI);
2251 ev_signal_start (EV_A_ &childev);
2252 ev_unref (EV_A); /* child watcher should not keep loop alive */
2256 ev_default_loop_ptr = 0;
2259 return ev_default_loop_ptr;
2265 postfork = 1; /* must be in line with ev_default_fork */
2268 /*****************************************************************************/
2271 ev_invoke (EV_P_ void *w, int revents)
2273 EV_CB_INVOKE ((W)w, revents);
2277 ev_pending_count (EV_P)
2280 unsigned int count = 0;
2282 for (pri = NUMPRI; pri--; )
2283 count += pendingcnt [pri];
2289 ev_invoke_pending (EV_P)
2293 for (pri = NUMPRI; pri--; )
2294 while (pendingcnt [pri])
2296 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
2299 EV_CB_INVOKE (p->w, p->events);
2305 /* make idle watchers pending. this handles the "call-idle */
2306 /* only when higher priorities are idle" logic */
2310 if (expect_false (idleall))
2314 for (pri = NUMPRI; pri--; )
2316 if (pendingcnt [pri])
2321 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
2329 /* make timers pending */
2335 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2339 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
2341 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
2343 /* first reschedule or stop timer */
2346 ev_at (w) += w->repeat;
2347 if (ev_at (w) < mn_now)
2350 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
2352 ANHE_at_cache (timers [HEAP0]);
2353 downheap (timers, timercnt, HEAP0);
2356 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
2359 feed_reverse (EV_A_ (W)w);
2361 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
2363 feed_reverse_done (EV_A_ EV_TIMER);
2367 #if EV_PERIODIC_ENABLE
2369 static void noinline
2370 periodic_recalc (EV_P_ ev_periodic *w)
2372 ev_tstamp interval = w->interval > MIN_INTERVAL ? w->interval : MIN_INTERVAL;
2373 ev_tstamp at = w->offset + interval * ev_floor ((ev_rt_now - w->offset) / interval);
2375 /* the above almost always errs on the low side */
2376 while (at <= ev_rt_now)
2378 ev_tstamp nat = at + w->interval;
2380 /* when resolution fails us, we use ev_rt_now */
2381 if (expect_false (nat == at))
2393 /* make periodics pending */
2395 periodics_reify (EV_P)
2399 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2405 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2407 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
2409 /* first reschedule or stop timer */
2410 if (w->reschedule_cb)
2412 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2414 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
2416 ANHE_at_cache (periodics [HEAP0]);
2417 downheap (periodics, periodiccnt, HEAP0);
2419 else if (w->interval)
2421 periodic_recalc (EV_A_ w);
2422 ANHE_at_cache (periodics [HEAP0]);
2423 downheap (periodics, periodiccnt, HEAP0);
2426 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2429 feed_reverse (EV_A_ (W)w);
2431 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
2433 feed_reverse_done (EV_A_ EV_PERIODIC);
2437 /* simply recalculate all periodics */
2438 /* TODO: maybe ensure that at least one event happens when jumping forward? */
2439 static void noinline ecb_cold
2440 periodics_reschedule (EV_P)
2444 /* adjust periodics after time jump */
2445 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
2447 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2449 if (w->reschedule_cb)
2450 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2451 else if (w->interval)
2452 periodic_recalc (EV_A_ w);
2454 ANHE_at_cache (periodics [i]);
2457 reheap (periodics, periodiccnt);
2461 /* adjust all timers by a given offset */
2462 static void noinline ecb_cold
2463 timers_reschedule (EV_P_ ev_tstamp adjust)
2467 for (i = 0; i < timercnt; ++i)
2469 ANHE *he = timers + i + HEAP0;
2470 ANHE_w (*he)->at += adjust;
2471 ANHE_at_cache (*he);
2475 /* fetch new monotonic and realtime times from the kernel */
2476 /* also detect if there was a timejump, and act accordingly */
2478 time_update (EV_P_ ev_tstamp max_block)
2480 #if EV_USE_MONOTONIC
2481 if (expect_true (have_monotonic))
2484 ev_tstamp odiff = rtmn_diff;
2486 mn_now = get_clock ();
2488 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
2489 /* interpolate in the meantime */
2490 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
2492 ev_rt_now = rtmn_diff + mn_now;
2497 ev_rt_now = ev_time ();
2499 /* loop a few times, before making important decisions.
2500 * on the choice of "4": one iteration isn't enough,
2501 * in case we get preempted during the calls to
2502 * ev_time and get_clock. a second call is almost guaranteed
2503 * to succeed in that case, though. and looping a few more times
2504 * doesn't hurt either as we only do this on time-jumps or
2505 * in the unlikely event of having been preempted here.
2510 rtmn_diff = ev_rt_now - mn_now;
2512 diff = odiff - rtmn_diff;
2514 if (expect_true ((diff < 0. ? -diff : diff) < MIN_TIMEJUMP))
2515 return; /* all is well */
2517 ev_rt_now = ev_time ();
2518 mn_now = get_clock ();
2522 /* no timer adjustment, as the monotonic clock doesn't jump */
2523 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
2524 # if EV_PERIODIC_ENABLE
2525 periodics_reschedule (EV_A);
2531 ev_rt_now = ev_time ();
2533 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
2535 /* adjust timers. this is easy, as the offset is the same for all of them */
2536 timers_reschedule (EV_A_ ev_rt_now - mn_now);
2537 #if EV_PERIODIC_ENABLE
2538 periodics_reschedule (EV_A);
2547 ev_run (EV_P_ int flags)
2553 assert (("libev: ev_loop recursion during release detected", loop_done != EVBREAK_RECURSE));
2555 loop_done = EVBREAK_CANCEL;
2557 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
2566 if (expect_false (curpid)) /* penalise the forking check even more */
2567 if (expect_false (getpid () != curpid))
2575 /* we might have forked, so queue fork handlers */
2576 if (expect_false (postfork))
2579 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
2584 #if EV_PREPARE_ENABLE
2585 /* queue prepare watchers (and execute them) */
2586 if (expect_false (preparecnt))
2588 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
2593 if (expect_false (loop_done))
2596 /* we might have forked, so reify kernel state if necessary */
2597 if (expect_false (postfork))
2600 /* update fd-related kernel structures */
2603 /* calculate blocking time */
2605 ev_tstamp waittime = 0.;
2606 ev_tstamp sleeptime = 0.;
2608 /* remember old timestamp for io_blocktime calculation */
2609 ev_tstamp prev_mn_now = mn_now;
2611 /* update time to cancel out callback processing overhead */
2612 time_update (EV_A_ 1e100);
2614 /* from now on, we want a pipe-wake-up */
2615 pipe_write_wanted = 1;
2617 ECB_MEMORY_FENCE; /* amke sure pipe_write_wanted is visible before we check for potential skips */
2619 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt || pipe_write_skipped)))
2621 waittime = MAX_BLOCKTIME;
2625 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now;
2626 if (waittime > to) waittime = to;
2629 #if EV_PERIODIC_ENABLE
2632 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now;
2633 if (waittime > to) waittime = to;
2637 /* don't let timeouts decrease the waittime below timeout_blocktime */
2638 if (expect_false (waittime < timeout_blocktime))
2639 waittime = timeout_blocktime;
2641 /* at this point, we NEED to wait, so we have to ensure */
2642 /* to pass a minimum nonzero value to the backend */
2643 if (expect_false (waittime < backend_mintime))
2644 waittime = backend_mintime;
2646 /* extra check because io_blocktime is commonly 0 */
2647 if (expect_false (io_blocktime))
2649 sleeptime = io_blocktime - (mn_now - prev_mn_now);
2651 if (sleeptime > waittime - backend_mintime)
2652 sleeptime = waittime - backend_mintime;
2654 if (expect_true (sleeptime > 0.))
2656 ev_sleep (sleeptime);
2657 waittime -= sleeptime;
2665 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
2666 backend_poll (EV_A_ waittime);
2667 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
2669 pipe_write_wanted = 0; /* just an optimsiation, no fence needed */
2671 if (pipe_write_skipped)
2673 assert (("libev: pipe_w not active, but pipe not written", ev_is_active (&pipe_w)));
2674 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
2678 /* update ev_rt_now, do magic */
2679 time_update (EV_A_ waittime + sleeptime);
2682 /* queue pending timers and reschedule them */
2683 timers_reify (EV_A); /* relative timers called last */
2684 #if EV_PERIODIC_ENABLE
2685 periodics_reify (EV_A); /* absolute timers called first */
2689 /* queue idle watchers unless other events are pending */
2694 /* queue check watchers, to be executed first */
2695 if (expect_false (checkcnt))
2696 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
2701 while (expect_true (
2704 && !(flags & (EVRUN_ONCE | EVRUN_NOWAIT))
2707 if (loop_done == EVBREAK_ONE)
2708 loop_done = EVBREAK_CANCEL;
2716 ev_break (EV_P_ int how)
2734 ev_now_update (EV_P)
2736 time_update (EV_A_ 1e100);
2742 ev_now_update (EV_A);
2748 ev_tstamp mn_prev = mn_now;
2750 ev_now_update (EV_A);
2751 timers_reschedule (EV_A_ mn_now - mn_prev);
2752 #if EV_PERIODIC_ENABLE
2753 /* TODO: really do this? */
2754 periodics_reschedule (EV_A);
2758 /*****************************************************************************/
2759 /* singly-linked list management, used when the expected list length is short */
2762 wlist_add (WL *head, WL elem)
2769 wlist_del (WL *head, WL elem)
2773 if (expect_true (*head == elem))
2779 head = &(*head)->next;
2783 /* internal, faster, version of ev_clear_pending */
2785 clear_pending (EV_P_ W w)
2789 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
2795 ev_clear_pending (EV_P_ void *w)
2798 int pending = w_->pending;
2800 if (expect_true (pending))
2802 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
2803 p->w = (W)&pending_w;
2812 pri_adjust (EV_P_ W w)
2814 int pri = ev_priority (w);
2815 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
2816 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
2817 ev_set_priority (w, pri);
2821 ev_start (EV_P_ W w, int active)
2823 pri_adjust (EV_A_ w);
2835 /*****************************************************************************/
2838 ev_io_start (EV_P_ ev_io *w)
2842 if (expect_false (ev_is_active (w)))
2845 assert (("libev: ev_io_start called with negative fd", fd >= 0));
2846 assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
2850 ev_start (EV_A_ (W)w, 1);
2851 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
2852 wlist_add (&anfds[fd].head, (WL)w);
2854 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
2855 w->events &= ~EV__IOFDSET;
2861 ev_io_stop (EV_P_ ev_io *w)
2863 clear_pending (EV_A_ (W)w);
2864 if (expect_false (!ev_is_active (w)))
2867 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
2871 wlist_del (&anfds[w->fd].head, (WL)w);
2872 ev_stop (EV_A_ (W)w);
2874 fd_change (EV_A_ w->fd, EV_ANFD_REIFY);
2880 ev_timer_start (EV_P_ ev_timer *w)
2882 if (expect_false (ev_is_active (w)))
2885 ev_at (w) += mn_now;
2887 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
2892 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
2893 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
2894 ANHE_w (timers [ev_active (w)]) = (WT)w;
2895 ANHE_at_cache (timers [ev_active (w)]);
2896 upheap (timers, ev_active (w));
2900 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
2904 ev_timer_stop (EV_P_ ev_timer *w)
2906 clear_pending (EV_A_ (W)w);
2907 if (expect_false (!ev_is_active (w)))
2913 int active = ev_active (w);
2915 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
2919 if (expect_true (active < timercnt + HEAP0))
2921 timers [active] = timers [timercnt + HEAP0];
2922 adjustheap (timers, timercnt, active);
2926 ev_at (w) -= mn_now;
2928 ev_stop (EV_A_ (W)w);
2934 ev_timer_again (EV_P_ ev_timer *w)
2938 if (ev_is_active (w))
2942 ev_at (w) = mn_now + w->repeat;
2943 ANHE_at_cache (timers [ev_active (w)]);
2944 adjustheap (timers, timercnt, ev_active (w));
2947 ev_timer_stop (EV_A_ w);
2951 ev_at (w) = w->repeat;
2952 ev_timer_start (EV_A_ w);
2959 ev_timer_remaining (EV_P_ ev_timer *w)
2961 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
2964 #if EV_PERIODIC_ENABLE
2966 ev_periodic_start (EV_P_ ev_periodic *w)
2968 if (expect_false (ev_is_active (w)))
2971 if (w->reschedule_cb)
2972 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2973 else if (w->interval)
2975 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
2976 periodic_recalc (EV_A_ w);
2979 ev_at (w) = w->offset;
2984 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
2985 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
2986 ANHE_w (periodics [ev_active (w)]) = (WT)w;
2987 ANHE_at_cache (periodics [ev_active (w)]);
2988 upheap (periodics, ev_active (w));
2992 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
2996 ev_periodic_stop (EV_P_ ev_periodic *w)
2998 clear_pending (EV_A_ (W)w);
2999 if (expect_false (!ev_is_active (w)))
3005 int active = ev_active (w);
3007 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
3011 if (expect_true (active < periodiccnt + HEAP0))
3013 periodics [active] = periodics [periodiccnt + HEAP0];
3014 adjustheap (periodics, periodiccnt, active);
3018 ev_stop (EV_A_ (W)w);
3024 ev_periodic_again (EV_P_ ev_periodic *w)
3026 /* TODO: use adjustheap and recalculation */
3027 ev_periodic_stop (EV_A_ w);
3028 ev_periodic_start (EV_A_ w);
3033 # define SA_RESTART 0
3036 #if EV_SIGNAL_ENABLE
3039 ev_signal_start (EV_P_ ev_signal *w)
3041 if (expect_false (ev_is_active (w)))
3044 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
3047 assert (("libev: a signal must not be attached to two different loops",
3048 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
3050 signals [w->signum - 1].loop = EV_A;
3058 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
3059 if (sigfd < 0 && errno == EINVAL)
3060 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
3064 fd_intern (sigfd); /* doing it twice will not hurt */
3066 sigemptyset (&sigfd_set);
3068 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
3069 ev_set_priority (&sigfd_w, EV_MAXPRI);
3070 ev_io_start (EV_A_ &sigfd_w);
3071 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
3077 /* TODO: check .head */
3078 sigaddset (&sigfd_set, w->signum);
3079 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
3081 signalfd (sigfd, &sigfd_set, 0);
3085 ev_start (EV_A_ (W)w, 1);
3086 wlist_add (&signals [w->signum - 1].head, (WL)w);
3089 # if EV_USE_SIGNALFD
3090 if (sigfd < 0) /*TODO*/
3096 signal (w->signum, ev_sighandler);
3098 struct sigaction sa;
3102 sa.sa_handler = ev_sighandler;
3103 sigfillset (&sa.sa_mask);
3104 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
3105 sigaction (w->signum, &sa, 0);
3107 if (origflags & EVFLAG_NOSIGMASK)
3109 sigemptyset (&sa.sa_mask);
3110 sigaddset (&sa.sa_mask, w->signum);
3111 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
3120 ev_signal_stop (EV_P_ ev_signal *w)
3122 clear_pending (EV_A_ (W)w);
3123 if (expect_false (!ev_is_active (w)))
3128 wlist_del (&signals [w->signum - 1].head, (WL)w);
3129 ev_stop (EV_A_ (W)w);
3131 if (!signals [w->signum - 1].head)
3134 signals [w->signum - 1].loop = 0; /* unattach from signal */
3142 sigaddset (&ss, w->signum);
3143 sigdelset (&sigfd_set, w->signum);
3145 signalfd (sigfd, &sigfd_set, 0);
3146 sigprocmask (SIG_UNBLOCK, &ss, 0);
3150 signal (w->signum, SIG_DFL);
3161 ev_child_start (EV_P_ ev_child *w)
3164 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
3166 if (expect_false (ev_is_active (w)))
3171 ev_start (EV_A_ (W)w, 1);
3172 wlist_add (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3178 ev_child_stop (EV_P_ ev_child *w)
3180 clear_pending (EV_A_ (W)w);
3181 if (expect_false (!ev_is_active (w)))
3186 wlist_del (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3187 ev_stop (EV_A_ (W)w);
3198 # define lstat(a,b) _stati64 (a,b)
3201 #define DEF_STAT_INTERVAL 5.0074891
3202 #define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
3203 #define MIN_STAT_INTERVAL 0.1074891
3205 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
3209 /* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
3210 # define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
3212 static void noinline
3213 infy_add (EV_P_ ev_stat *w)
3215 w->wd = inotify_add_watch (fs_fd, w->path, IN_ATTRIB | IN_DELETE_SELF | IN_MOVE_SELF | IN_MODIFY | IN_DONT_FOLLOW | IN_MASK_ADD);
3221 /* now local changes will be tracked by inotify, but remote changes won't */
3222 /* unless the filesystem is known to be local, we therefore still poll */
3223 /* also do poll on <2.6.25, but with normal frequency */
3226 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3227 else if (!statfs (w->path, &sfs)
3228 && (sfs.f_type == 0x1373 /* devfs */
3229 || sfs.f_type == 0xEF53 /* ext2/3 */
3230 || sfs.f_type == 0x3153464a /* jfs */
3231 || sfs.f_type == 0x52654973 /* reiser3 */
3232 || sfs.f_type == 0x01021994 /* tempfs */
3233 || sfs.f_type == 0x58465342 /* xfs */))
3234 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
3236 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
3240 /* can't use inotify, continue to stat */
3241 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3243 /* if path is not there, monitor some parent directory for speedup hints */
3244 /* note that exceeding the hardcoded path limit is not a correctness issue, */
3245 /* but an efficiency issue only */
3246 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
3249 strcpy (path, w->path);
3253 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
3254 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
3256 char *pend = strrchr (path, '/');
3258 if (!pend || pend == path)
3262 w->wd = inotify_add_watch (fs_fd, path, mask);
3264 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
3269 wlist_add (&fs_hash [w->wd & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3271 /* now re-arm timer, if required */
3272 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3273 ev_timer_again (EV_A_ &w->timer);
3274 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3277 static void noinline
3278 infy_del (EV_P_ ev_stat *w)
3287 slot = wd & ((EV_INOTIFY_HASHSIZE) - 1);
3288 wlist_del (&fs_hash [slot].head, (WL)w);
3290 /* remove this watcher, if others are watching it, they will rearm */
3291 inotify_rm_watch (fs_fd, wd);
3294 static void noinline
3295 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
3298 /* overflow, need to check for all hash slots */
3299 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3300 infy_wd (EV_A_ slot, wd, ev);
3305 for (w_ = fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head; w_; )
3307 ev_stat *w = (ev_stat *)w_;
3308 w_ = w_->next; /* lets us remove this watcher and all before it */
3310 if (w->wd == wd || wd == -1)
3312 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
3314 wlist_del (&fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3316 infy_add (EV_A_ w); /* re-add, no matter what */
3319 stat_timer_cb (EV_A_ &w->timer, 0);
3326 infy_cb (EV_P_ ev_io *w, int revents)
3328 char buf [EV_INOTIFY_BUFSIZE];
3330 int len = read (fs_fd, buf, sizeof (buf));
3332 for (ofs = 0; ofs < len; )
3334 struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
3335 infy_wd (EV_A_ ev->wd, ev->wd, ev);
3336 ofs += sizeof (struct inotify_event) + ev->len;
3340 inline_size void ecb_cold
3341 ev_check_2625 (EV_P)
3343 /* kernels < 2.6.25 are borked
3344 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
3346 if (ev_linux_version () < 0x020619)
3355 #if defined (IN_CLOEXEC) && defined (IN_NONBLOCK)
3356 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3360 return inotify_init ();
3371 ev_check_2625 (EV_A);
3373 fs_fd = infy_newfd ();
3378 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3379 ev_set_priority (&fs_w, EV_MAXPRI);
3380 ev_io_start (EV_A_ &fs_w);
3394 ev_io_stop (EV_A_ &fs_w);
3396 fs_fd = infy_newfd ();
3401 ev_io_set (&fs_w, fs_fd, EV_READ);
3402 ev_io_start (EV_A_ &fs_w);
3406 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3408 WL w_ = fs_hash [slot].head;
3409 fs_hash [slot].head = 0;
3413 ev_stat *w = (ev_stat *)w_;
3414 w_ = w_->next; /* lets us add this watcher */
3419 infy_add (EV_A_ w); /* re-add, no matter what */
3422 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3423 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3424 ev_timer_again (EV_A_ &w->timer);
3425 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3434 # define EV_LSTAT(p,b) _stati64 (p, b)
3436 # define EV_LSTAT(p,b) lstat (p, b)
3440 ev_stat_stat (EV_P_ ev_stat *w)
3442 if (lstat (w->path, &w->attr) < 0)
3443 w->attr.st_nlink = 0;
3444 else if (!w->attr.st_nlink)
3445 w->attr.st_nlink = 1;
3448 static void noinline
3449 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3451 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3453 ev_statdata prev = w->attr;
3454 ev_stat_stat (EV_A_ w);
3456 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3458 prev.st_dev != w->attr.st_dev
3459 || prev.st_ino != w->attr.st_ino
3460 || prev.st_mode != w->attr.st_mode
3461 || prev.st_nlink != w->attr.st_nlink
3462 || prev.st_uid != w->attr.st_uid
3463 || prev.st_gid != w->attr.st_gid
3464 || prev.st_rdev != w->attr.st_rdev
3465 || prev.st_size != w->attr.st_size
3466 || prev.st_atime != w->attr.st_atime
3467 || prev.st_mtime != w->attr.st_mtime
3468 || prev.st_ctime != w->attr.st_ctime
3470 /* we only update w->prev on actual differences */
3471 /* in case we test more often than invoke the callback, */
3472 /* to ensure that prev is always different to attr */
3480 ev_stat_stat (EV_A_ w); /* avoid race... */
3484 ev_feed_event (EV_A_ w, EV_STAT);
3489 ev_stat_start (EV_P_ ev_stat *w)
3491 if (expect_false (ev_is_active (w)))
3494 ev_stat_stat (EV_A_ w);
3496 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3497 w->interval = MIN_STAT_INTERVAL;
3499 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3500 ev_set_priority (&w->timer, ev_priority (w));
3510 ev_timer_again (EV_A_ &w->timer);
3514 ev_start (EV_A_ (W)w, 1);
3520 ev_stat_stop (EV_P_ ev_stat *w)
3522 clear_pending (EV_A_ (W)w);
3523 if (expect_false (!ev_is_active (w)))
3532 if (ev_is_active (&w->timer))
3535 ev_timer_stop (EV_A_ &w->timer);
3538 ev_stop (EV_A_ (W)w);
3546 ev_idle_start (EV_P_ ev_idle *w)
3548 if (expect_false (ev_is_active (w)))
3551 pri_adjust (EV_A_ (W)w);
3556 int active = ++idlecnt [ABSPRI (w)];
3559 ev_start (EV_A_ (W)w, active);
3561 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
3562 idles [ABSPRI (w)][active - 1] = w;
3569 ev_idle_stop (EV_P_ ev_idle *w)
3571 clear_pending (EV_A_ (W)w);
3572 if (expect_false (!ev_is_active (w)))
3578 int active = ev_active (w);
3580 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
3581 ev_active (idles [ABSPRI (w)][active - 1]) = active;
3583 ev_stop (EV_A_ (W)w);
3591 #if EV_PREPARE_ENABLE
3593 ev_prepare_start (EV_P_ ev_prepare *w)
3595 if (expect_false (ev_is_active (w)))
3600 ev_start (EV_A_ (W)w, ++preparecnt);
3601 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
3602 prepares [preparecnt - 1] = w;
3608 ev_prepare_stop (EV_P_ ev_prepare *w)
3610 clear_pending (EV_A_ (W)w);
3611 if (expect_false (!ev_is_active (w)))
3617 int active = ev_active (w);
3619 prepares [active - 1] = prepares [--preparecnt];
3620 ev_active (prepares [active - 1]) = active;
3623 ev_stop (EV_A_ (W)w);
3631 ev_check_start (EV_P_ ev_check *w)
3633 if (expect_false (ev_is_active (w)))
3638 ev_start (EV_A_ (W)w, ++checkcnt);
3639 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
3640 checks [checkcnt - 1] = w;
3646 ev_check_stop (EV_P_ ev_check *w)
3648 clear_pending (EV_A_ (W)w);
3649 if (expect_false (!ev_is_active (w)))
3655 int active = ev_active (w);
3657 checks [active - 1] = checks [--checkcnt];
3658 ev_active (checks [active - 1]) = active;
3661 ev_stop (EV_A_ (W)w);
3669 ev_embed_sweep (EV_P_ ev_embed *w)
3671 ev_run (w->other, EVRUN_NOWAIT);
3675 embed_io_cb (EV_P_ ev_io *io, int revents)
3677 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
3680 ev_feed_event (EV_A_ (W)w, EV_EMBED);
3682 ev_run (w->other, EVRUN_NOWAIT);
3686 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
3688 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
3696 ev_run (EV_A_ EVRUN_NOWAIT);
3702 embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
3704 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
3706 ev_embed_stop (EV_A_ w);
3711 ev_loop_fork (EV_A);
3712 ev_run (EV_A_ EVRUN_NOWAIT);
3715 ev_embed_start (EV_A_ w);
3720 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
3722 ev_idle_stop (EV_A_ idle);
3727 ev_embed_start (EV_P_ ev_embed *w)
3729 if (expect_false (ev_is_active (w)))
3734 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
3735 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
3740 ev_set_priority (&w->io, ev_priority (w));
3741 ev_io_start (EV_A_ &w->io);
3743 ev_prepare_init (&w->prepare, embed_prepare_cb);
3744 ev_set_priority (&w->prepare, EV_MINPRI);
3745 ev_prepare_start (EV_A_ &w->prepare);
3747 ev_fork_init (&w->fork, embed_fork_cb);
3748 ev_fork_start (EV_A_ &w->fork);
3750 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
3752 ev_start (EV_A_ (W)w, 1);
3758 ev_embed_stop (EV_P_ ev_embed *w)
3760 clear_pending (EV_A_ (W)w);
3761 if (expect_false (!ev_is_active (w)))
3766 ev_io_stop (EV_A_ &w->io);
3767 ev_prepare_stop (EV_A_ &w->prepare);
3768 ev_fork_stop (EV_A_ &w->fork);
3770 ev_stop (EV_A_ (W)w);
3778 ev_fork_start (EV_P_ ev_fork *w)
3780 if (expect_false (ev_is_active (w)))
3785 ev_start (EV_A_ (W)w, ++forkcnt);
3786 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
3787 forks [forkcnt - 1] = w;
3793 ev_fork_stop (EV_P_ ev_fork *w)
3795 clear_pending (EV_A_ (W)w);
3796 if (expect_false (!ev_is_active (w)))
3802 int active = ev_active (w);
3804 forks [active - 1] = forks [--forkcnt];
3805 ev_active (forks [active - 1]) = active;
3808 ev_stop (EV_A_ (W)w);
3814 #if EV_CLEANUP_ENABLE
3816 ev_cleanup_start (EV_P_ ev_cleanup *w)
3818 if (expect_false (ev_is_active (w)))
3823 ev_start (EV_A_ (W)w, ++cleanupcnt);
3824 array_needsize (ev_cleanup *, cleanups, cleanupmax, cleanupcnt, EMPTY2);
3825 cleanups [cleanupcnt - 1] = w;
3827 /* cleanup watchers should never keep a refcount on the loop */
3833 ev_cleanup_stop (EV_P_ ev_cleanup *w)
3835 clear_pending (EV_A_ (W)w);
3836 if (expect_false (!ev_is_active (w)))
3843 int active = ev_active (w);
3845 cleanups [active - 1] = cleanups [--cleanupcnt];
3846 ev_active (cleanups [active - 1]) = active;
3849 ev_stop (EV_A_ (W)w);
3857 ev_async_start (EV_P_ ev_async *w)
3859 if (expect_false (ev_is_active (w)))
3868 ev_start (EV_A_ (W)w, ++asynccnt);
3869 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
3870 asyncs [asynccnt - 1] = w;
3876 ev_async_stop (EV_P_ ev_async *w)
3878 clear_pending (EV_A_ (W)w);
3879 if (expect_false (!ev_is_active (w)))
3885 int active = ev_active (w);
3887 asyncs [active - 1] = asyncs [--asynccnt];
3888 ev_active (asyncs [active - 1]) = active;
3891 ev_stop (EV_A_ (W)w);
3897 ev_async_send (EV_P_ ev_async *w)
3900 evpipe_write (EV_A_ &async_pending);
3904 /*****************************************************************************/
3910 void (*cb)(int revents, void *arg);
3915 once_cb (EV_P_ struct ev_once *once, int revents)
3917 void (*cb)(int revents, void *arg) = once->cb;
3918 void *arg = once->arg;
3920 ev_io_stop (EV_A_ &once->io);
3921 ev_timer_stop (EV_A_ &once->to);
3928 once_cb_io (EV_P_ ev_io *w, int revents)
3930 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
3932 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
3936 once_cb_to (EV_P_ ev_timer *w, int revents)
3938 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
3940 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
3944 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
3946 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
3948 if (expect_false (!once))
3950 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMER, arg);
3957 ev_init (&once->io, once_cb_io);
3960 ev_io_set (&once->io, fd, events);
3961 ev_io_start (EV_A_ &once->io);
3964 ev_init (&once->to, once_cb_to);
3967 ev_timer_set (&once->to, timeout, 0.);
3968 ev_timer_start (EV_A_ &once->to);
3972 /*****************************************************************************/
3976 ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
3979 ev_watcher_list *wl, *wn;
3981 if (types & (EV_IO | EV_EMBED))
3982 for (i = 0; i < anfdmax; ++i)
3983 for (wl = anfds [i].head; wl; )
3988 if (ev_cb ((ev_io *)wl) == embed_io_cb)
3990 if (types & EV_EMBED)
3991 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
3996 if (ev_cb ((ev_io *)wl) == infy_cb)
4000 if ((ev_io *)wl != &pipe_w)
4002 cb (EV_A_ EV_IO, wl);
4007 if (types & (EV_TIMER | EV_STAT))
4008 for (i = timercnt + HEAP0; i-- > HEAP0; )
4010 /*TODO: timer is not always active*/
4011 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
4013 if (types & EV_STAT)
4014 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
4018 if (types & EV_TIMER)
4019 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
4021 #if EV_PERIODIC_ENABLE
4022 if (types & EV_PERIODIC)
4023 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
4024 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
4028 if (types & EV_IDLE)
4029 for (j = NUMPRI; i--; )
4030 for (i = idlecnt [j]; i--; )
4031 cb (EV_A_ EV_IDLE, idles [j][i]);
4035 if (types & EV_FORK)
4036 for (i = forkcnt; i--; )
4037 if (ev_cb (forks [i]) != embed_fork_cb)
4038 cb (EV_A_ EV_FORK, forks [i]);
4042 if (types & EV_ASYNC)
4043 for (i = asynccnt; i--; )
4044 cb (EV_A_ EV_ASYNC, asyncs [i]);
4047 #if EV_PREPARE_ENABLE
4048 if (types & EV_PREPARE)
4049 for (i = preparecnt; i--; )
4050 # if EV_EMBED_ENABLE
4051 if (ev_cb (prepares [i]) != embed_prepare_cb)
4053 cb (EV_A_ EV_PREPARE, prepares [i]);
4057 if (types & EV_CHECK)
4058 for (i = checkcnt; i--; )
4059 cb (EV_A_ EV_CHECK, checks [i]);
4062 #if EV_SIGNAL_ENABLE
4063 if (types & EV_SIGNAL)
4064 for (i = 0; i < EV_NSIG - 1; ++i)
4065 for (wl = signals [i].head; wl; )
4068 cb (EV_A_ EV_SIGNAL, wl);
4074 if (types & EV_CHILD)
4075 for (i = (EV_PID_HASHSIZE); i--; )
4076 for (wl = childs [i]; wl; )
4079 cb (EV_A_ EV_CHILD, wl);
4083 /* EV_STAT 0x00001000 /* stat data changed */
4084 /* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
4089 #include "ev_wrap.h"