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 #if ECB_GCC_VERSION(3,1)
498 #define ecb_attribute(attrlist) __attribute__(attrlist)
499 #define ecb_is_constant(expr) __builtin_constant_p (expr)
500 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
501 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
503 #define ecb_attribute(attrlist)
504 #define ecb_is_constant(expr) 0
505 #define ecb_expect(expr,value) (expr)
506 #define ecb_prefetch(addr,rw,locality)
509 #define ecb_noinline ecb_attribute ((__noinline__))
510 #define ecb_noreturn ecb_attribute ((__noreturn__))
511 #define ecb_unused ecb_attribute ((__unused__))
512 #define ecb_const ecb_attribute ((__const__))
513 #define ecb_pure ecb_attribute ((__pure__))
515 #if ECB_GCC_VERSION(4,3)
516 #define ecb_artificial ecb_attribute ((__artificial__))
517 #define ecb_hot ecb_attribute ((__hot__))
518 #define ecb_cold ecb_attribute ((__cold__))
520 #define ecb_artificial
525 /* put around conditional expressions if you are very sure that the */
526 /* expression is mostly true or mostly false. note that these return */
527 /* booleans, not the expression. */
528 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
529 #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
532 #define expect_false(cond) ecb_expect_false (cond)
533 #define expect_true(cond) ecb_expect_true (cond)
534 #define noinline ecb_noinline
536 #define inline_size ecb_inline
539 # define inline_speed ecb_inline
541 # define inline_speed static noinline
544 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
546 #if EV_MINPRI == EV_MAXPRI
547 # define ABSPRI(w) (((W)w), 0)
549 # define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
552 #define EMPTY /* required for microsofts broken pseudo-c compiler */
553 #define EMPTY2(a,b) /* used to suppress some warnings */
555 typedef ev_watcher *W;
556 typedef ev_watcher_list *WL;
557 typedef ev_watcher_time *WT;
559 #define ev_active(w) ((W)(w))->active
560 #define ev_at(w) ((WT)(w))->at
563 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
564 /* giving it a reasonably high chance of working on typical architectures */
565 static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
569 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
572 #ifndef EV_FD_TO_WIN32_HANDLE
573 # define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
575 #ifndef EV_WIN32_HANDLE_TO_FD
576 # define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
578 #ifndef EV_WIN32_CLOSE_FD
579 # define EV_WIN32_CLOSE_FD(fd) close (fd)
583 # include "ev_win32.c"
586 /*****************************************************************************/
588 /* define a suitable floor function (only used by periodics atm) */
592 # define ev_floor(v) floor (v)
597 /* a floor() replacement function, should be independent of ev_tstamp type */
598 static ev_tstamp noinline
599 ev_floor (ev_tstamp v)
601 /* the choice of shift factor is not terribly important */
602 #if FLT_RADIX != 2 /* assume FLT_RADIX == 10 */
603 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 10000000000000000000. : 1000000000.;
605 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 18446744073709551616. : 4294967296.;
608 /* argument too large for an unsigned long? */
609 if (expect_false (v >= shift))
614 return v; /* very large number */
616 f = shift * ev_floor (v * (1. / shift));
617 return f + ev_floor (v - f);
620 /* special treatment for negative args? */
621 if (expect_false (v < 0.))
623 ev_tstamp f = -ev_floor (-v);
625 return f - (f == v ? 0 : 1);
628 /* fits into an unsigned long */
629 return (unsigned long)v;
634 /*****************************************************************************/
637 # include <sys/utsname.h>
640 static unsigned int noinline ecb_cold
641 ev_linux_version (void)
647 char *p = buf.release;
658 if (*p >= '0' && *p <= '9')
659 c = c * 10 + *p++ - '0';
676 /*****************************************************************************/
679 static void noinline ecb_cold
680 ev_printerr (const char *msg)
682 write (STDERR_FILENO, msg, strlen (msg));
686 static void (*syserr_cb)(const char *msg);
689 ev_set_syserr_cb (void (*cb)(const char *msg))
694 static void noinline ecb_cold
695 ev_syserr (const char *msg)
698 msg = "(libev) system error";
707 ev_printerr (strerror (errno));
717 ev_realloc_emul (void *ptr, long size)
720 return realloc (ptr, size);
722 /* some systems, notably openbsd and darwin, fail to properly
723 * implement realloc (x, 0) (as required by both ansi c-89 and
724 * the single unix specification, so work around them here.
728 return realloc (ptr, size);
735 static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
738 ev_set_allocator (void *(*cb)(void *ptr, long size))
744 ev_realloc (void *ptr, long size)
746 ptr = alloc (ptr, size);
751 ev_printerr ("(libev) memory allocation failed, aborting.\n");
753 fprintf (stderr, "(libev) cannot allocate %ld bytes, aborting.", size);
761 #define ev_malloc(size) ev_realloc (0, (size))
762 #define ev_free(ptr) ev_realloc ((ptr), 0)
764 /*****************************************************************************/
766 /* set in reify when reification needed */
767 #define EV_ANFD_REIFY 1
769 /* file descriptor info structure */
773 unsigned char events; /* the events watched for */
774 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
775 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
776 unsigned char unused;
778 unsigned int egen; /* generation counter to counter epoll bugs */
780 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
788 /* stores the pending event set for a given watcher */
792 int events; /* the pending event set for the given watcher */
796 /* hash table entry per inotify-id */
811 #define ANHE_w(he) (he).w /* access watcher, read-write */
812 #define ANHE_at(he) (he).at /* access cached at, read-only */
813 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
818 #define ANHE_w(he) (he)
819 #define ANHE_at(he) (he)->at
820 #define ANHE_at_cache(he)
828 #define ev_rt_now ((loop)->ev_rt_now)
829 #define VAR(name,decl) decl;
835 static struct ev_loop default_loop_struct;
836 struct ev_loop *ev_default_loop_ptr;
841 #define VAR(name,decl) static decl;
845 static int ev_default_loop_ptr;
850 # define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
851 # define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
852 # define EV_INVOKE_PENDING invoke_cb (EV_A)
854 # define EV_RELEASE_CB (void)0
855 # define EV_ACQUIRE_CB (void)0
856 # define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
859 #define EVBREAK_RECURSE 0x80
861 /*****************************************************************************/
863 #ifndef EV_HAVE_EV_TIME
868 if (expect_true (have_realtime))
871 clock_gettime (CLOCK_REALTIME, &ts);
872 return ts.tv_sec + ts.tv_nsec * 1e-9;
877 gettimeofday (&tv, 0);
878 return tv.tv_sec + tv.tv_usec * 1e-6;
882 inline_size ev_tstamp
886 if (expect_true (have_monotonic))
889 clock_gettime (CLOCK_MONOTONIC, &ts);
890 return ts.tv_sec + ts.tv_nsec * 1e-9;
906 ev_sleep (ev_tstamp delay)
913 EV_TS_SET (ts, delay);
915 #elif defined(_WIN32)
916 Sleep ((unsigned long)(delay * 1e3));
920 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
921 /* something not guaranteed by newer posix versions, but guaranteed */
923 EV_TV_SET (tv, delay);
924 select (0, 0, 0, 0, &tv);
929 /*****************************************************************************/
931 #define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
933 /* find a suitable new size for the given array, */
934 /* hopefully by rounding to a nice-to-malloc size */
936 array_nextsize (int elem, int cur, int cnt)
944 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
945 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
948 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
949 ncur = ncur - sizeof (void *) * 4;
956 static void * noinline ecb_cold
957 array_realloc (int elem, void *base, int *cur, int cnt)
959 *cur = array_nextsize (elem, *cur, cnt);
960 return ev_realloc (base, elem * *cur);
963 #define array_init_zero(base,count) \
964 memset ((void *)(base), 0, sizeof (*(base)) * (count))
966 #define array_needsize(type,base,cur,cnt,init) \
967 if (expect_false ((cnt) > (cur))) \
970 (base) = (type *)array_realloc \
971 (sizeof (type), (base), &(cur), (cnt)); \
972 init ((base) + (ocur_), (cur) - ocur_); \
976 #define array_slim(type,stem) \
977 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
979 stem ## max = array_roundsize (stem ## cnt >> 1); \
980 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
981 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
985 #define array_free(stem, idx) \
986 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
988 /*****************************************************************************/
990 /* dummy callback for pending events */
992 pendingcb (EV_P_ ev_prepare *w, int revents)
997 ev_feed_event (EV_P_ void *w, int revents)
1000 int pri = ABSPRI (w_);
1002 if (expect_false (w_->pending))
1003 pendings [pri][w_->pending - 1].events |= revents;
1006 w_->pending = ++pendingcnt [pri];
1007 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
1008 pendings [pri][w_->pending - 1].w = w_;
1009 pendings [pri][w_->pending - 1].events = revents;
1014 feed_reverse (EV_P_ W w)
1016 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
1017 rfeeds [rfeedcnt++] = w;
1021 feed_reverse_done (EV_P_ int revents)
1024 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
1029 queue_events (EV_P_ W *events, int eventcnt, int type)
1033 for (i = 0; i < eventcnt; ++i)
1034 ev_feed_event (EV_A_ events [i], type);
1037 /*****************************************************************************/
1040 fd_event_nocheck (EV_P_ int fd, int revents)
1042 ANFD *anfd = anfds + fd;
1045 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1047 int ev = w->events & revents;
1050 ev_feed_event (EV_A_ (W)w, ev);
1054 /* do not submit kernel events for fds that have reify set */
1055 /* because that means they changed while we were polling for new events */
1057 fd_event (EV_P_ int fd, int revents)
1059 ANFD *anfd = anfds + fd;
1061 if (expect_true (!anfd->reify))
1062 fd_event_nocheck (EV_A_ fd, revents);
1066 ev_feed_fd_event (EV_P_ int fd, int revents)
1068 if (fd >= 0 && fd < anfdmax)
1069 fd_event_nocheck (EV_A_ fd, revents);
1072 /* make sure the external fd watch events are in-sync */
1073 /* with the kernel/libev internal state */
1079 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1080 for (i = 0; i < fdchangecnt; ++i)
1082 int fd = fdchanges [i];
1083 ANFD *anfd = anfds + fd;
1085 if (anfd->reify & EV__IOFDSET && anfd->head)
1087 SOCKET handle = EV_FD_TO_WIN32_HANDLE (fd);
1089 if (handle != anfd->handle)
1093 assert (("libev: only socket fds supported in this configuration", ioctlsocket (handle, FIONREAD, &arg) == 0));
1095 /* handle changed, but fd didn't - we need to do it in two steps */
1096 backend_modify (EV_A_ fd, anfd->events, 0);
1098 anfd->handle = handle;
1104 for (i = 0; i < fdchangecnt; ++i)
1106 int fd = fdchanges [i];
1107 ANFD *anfd = anfds + fd;
1110 unsigned char o_events = anfd->events;
1111 unsigned char o_reify = anfd->reify;
1115 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
1119 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1120 anfd->events |= (unsigned char)w->events;
1122 if (o_events != anfd->events)
1123 o_reify = EV__IOFDSET; /* actually |= */
1126 if (o_reify & EV__IOFDSET)
1127 backend_modify (EV_A_ fd, o_events, anfd->events);
1133 /* something about the given fd changed */
1135 fd_change (EV_P_ int fd, int flags)
1137 unsigned char reify = anfds [fd].reify;
1138 anfds [fd].reify |= flags;
1140 if (expect_true (!reify))
1143 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
1144 fdchanges [fdchangecnt - 1] = fd;
1148 /* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
1149 inline_speed void ecb_cold
1150 fd_kill (EV_P_ int fd)
1154 while ((w = (ev_io *)anfds [fd].head))
1156 ev_io_stop (EV_A_ w);
1157 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
1161 /* check whether the given fd is actually valid, for error recovery */
1162 inline_size int ecb_cold
1166 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
1168 return fcntl (fd, F_GETFD) != -1;
1172 /* called on EBADF to verify fds */
1173 static void noinline ecb_cold
1178 for (fd = 0; fd < anfdmax; ++fd)
1179 if (anfds [fd].events)
1180 if (!fd_valid (fd) && errno == EBADF)
1184 /* called on ENOMEM in select/poll to kill some fds and retry */
1185 static void noinline ecb_cold
1190 for (fd = anfdmax; fd--; )
1191 if (anfds [fd].events)
1198 /* usually called after fork if backend needs to re-arm all fds from scratch */
1199 static void noinline
1204 for (fd = 0; fd < anfdmax; ++fd)
1205 if (anfds [fd].events)
1207 anfds [fd].events = 0;
1208 anfds [fd].emask = 0;
1209 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
1213 /* used to prepare libev internal fd's */
1214 /* this is not fork-safe */
1219 unsigned long arg = 1;
1220 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
1222 fcntl (fd, F_SETFD, FD_CLOEXEC);
1223 fcntl (fd, F_SETFL, O_NONBLOCK);
1227 /*****************************************************************************/
1230 * the heap functions want a real array index. array index 0 is guaranteed to not
1231 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
1232 * the branching factor of the d-tree.
1236 * at the moment we allow libev the luxury of two heaps,
1237 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
1238 * which is more cache-efficient.
1239 * the difference is about 5% with 50000+ watchers.
1244 #define HEAP0 (DHEAP - 1) /* index of first element in heap */
1245 #define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
1246 #define UPHEAP_DONE(p,k) ((p) == (k))
1248 /* away from the root */
1250 downheap (ANHE *heap, int N, int k)
1253 ANHE *E = heap + N + HEAP0;
1259 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
1261 /* find minimum child */
1262 if (expect_true (pos + DHEAP - 1 < E))
1264 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1265 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1266 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1267 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1271 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1272 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1273 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1274 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1279 if (ANHE_at (he) <= minat)
1283 ev_active (ANHE_w (*minpos)) = k;
1289 ev_active (ANHE_w (he)) = k;
1295 #define HPARENT(k) ((k) >> 1)
1296 #define UPHEAP_DONE(p,k) (!(p))
1298 /* away from the root */
1300 downheap (ANHE *heap, int N, int k)
1311 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
1314 if (ANHE_at (he) <= ANHE_at (heap [c]))
1317 heap [k] = heap [c];
1318 ev_active (ANHE_w (heap [k])) = k;
1324 ev_active (ANHE_w (he)) = k;
1328 /* towards the root */
1330 upheap (ANHE *heap, int k)
1336 int p = HPARENT (k);
1338 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1341 heap [k] = heap [p];
1342 ev_active (ANHE_w (heap [k])) = k;
1347 ev_active (ANHE_w (he)) = k;
1350 /* move an element suitably so it is in a correct place */
1352 adjustheap (ANHE *heap, int N, int k)
1354 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
1357 downheap (heap, N, k);
1360 /* rebuild the heap: this function is used only once and executed rarely */
1362 reheap (ANHE *heap, int N)
1366 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1367 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1368 for (i = 0; i < N; ++i)
1369 upheap (heap, i + HEAP0);
1372 /*****************************************************************************/
1374 /* associate signal watchers to a signal signal */
1377 EV_ATOMIC_T pending;
1384 static ANSIG signals [EV_NSIG - 1];
1386 /*****************************************************************************/
1388 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1390 static void noinline ecb_cold
1393 if (!ev_is_active (&pipe_w))
1396 evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
1397 if (evfd < 0 && errno == EINVAL)
1398 evfd = eventfd (0, 0);
1403 fd_intern (evfd); /* doing it twice doesn't hurt */
1404 ev_io_set (&pipe_w, evfd, EV_READ);
1409 while (pipe (evpipe))
1410 ev_syserr ("(libev) error creating signal/async pipe");
1412 fd_intern (evpipe [0]);
1413 fd_intern (evpipe [1]);
1414 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1417 ev_io_start (EV_A_ &pipe_w);
1418 ev_unref (EV_A); /* watcher should not keep loop alive */
1423 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1429 pipe_write_skipped = 1;
1431 if (pipe_write_wanted)
1435 pipe_write_skipped = 0;
1437 old_errno = errno; /* save errno because write will clobber it */
1442 uint64_t counter = 1;
1443 write (evfd, &counter, sizeof (uint64_t));
1448 /* win32 people keep sending patches that change this write() to send() */
1449 /* and then run away. but send() is wrong, it wants a socket handle on win32 */
1450 /* so when you think this write should be a send instead, please find out */
1451 /* where your send() is from - it's definitely not the microsoft send, and */
1452 /* tell me. thank you. */
1453 write (evpipe [1], &(evpipe [1]), 1);
1461 /* called whenever the libev signal pipe */
1462 /* got some events (signal, async) */
1464 pipecb (EV_P_ ev_io *iow, int revents)
1468 if (revents & EV_READ)
1474 read (evfd, &counter, sizeof (uint64_t));
1480 /* see discussion in evpipe_write when you think this read should be recv in win32 */
1481 read (evpipe [0], &dummy, 1);
1485 pipe_write_skipped = 0;
1487 #if EV_SIGNAL_ENABLE
1492 for (i = EV_NSIG - 1; i--; )
1493 if (expect_false (signals [i].pending))
1494 ev_feed_signal_event (EV_A_ i + 1);
1503 for (i = asynccnt; i--; )
1504 if (asyncs [i]->sent)
1506 asyncs [i]->sent = 0;
1507 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1513 /*****************************************************************************/
1516 ev_feed_signal (int signum)
1519 EV_P = signals [signum - 1].loop;
1527 signals [signum - 1].pending = 1;
1528 evpipe_write (EV_A_ &sig_pending);
1532 ev_sighandler (int signum)
1535 signal (signum, ev_sighandler);
1538 ev_feed_signal (signum);
1542 ev_feed_signal_event (EV_P_ int signum)
1546 if (expect_false (signum <= 0 || signum > EV_NSIG))
1552 /* it is permissible to try to feed a signal to the wrong loop */
1553 /* or, likely more useful, feeding a signal nobody is waiting for */
1555 if (expect_false (signals [signum].loop != EV_A))
1559 signals [signum].pending = 0;
1561 for (w = signals [signum].head; w; w = w->next)
1562 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1567 sigfdcb (EV_P_ ev_io *iow, int revents)
1569 struct signalfd_siginfo si[2], *sip; /* these structs are big */
1573 ssize_t res = read (sigfd, si, sizeof (si));
1575 /* not ISO-C, as res might be -1, but works with SuS */
1576 for (sip = si; (char *)sip < (char *)si + res; ++sip)
1577 ev_feed_signal_event (EV_A_ sip->ssi_signo);
1579 if (res < (ssize_t)sizeof (si))
1587 /*****************************************************************************/
1590 static WL childs [EV_PID_HASHSIZE];
1592 static ev_signal childev;
1594 #ifndef WIFCONTINUED
1595 # define WIFCONTINUED(status) 0
1598 /* handle a single child status event */
1600 child_reap (EV_P_ int chain, int pid, int status)
1603 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1605 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
1607 if ((w->pid == pid || !w->pid)
1608 && (!traced || (w->flags & 1)))
1610 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
1612 w->rstatus = status;
1613 ev_feed_event (EV_A_ (W)w, EV_CHILD);
1619 # define WCONTINUED 0
1622 /* called on sigchld etc., calls waitpid */
1624 childcb (EV_P_ ev_signal *sw, int revents)
1628 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1629 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1632 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1635 /* make sure we are called again until all children have been reaped */
1636 /* we need to do it this way so that the callback gets called before we continue */
1637 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1639 child_reap (EV_A_ pid, pid, status);
1640 if ((EV_PID_HASHSIZE) > 1)
1641 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1646 /*****************************************************************************/
1649 # include "ev_iocp.c"
1652 # include "ev_port.c"
1655 # include "ev_kqueue.c"
1658 # include "ev_epoll.c"
1661 # include "ev_poll.c"
1664 # include "ev_select.c"
1668 ev_version_major (void)
1670 return EV_VERSION_MAJOR;
1674 ev_version_minor (void)
1676 return EV_VERSION_MINOR;
1679 /* return true if we are running with elevated privileges and should ignore env variables */
1680 int inline_size ecb_cold
1681 enable_secure (void)
1686 return getuid () != geteuid ()
1687 || getgid () != getegid ();
1691 unsigned int ecb_cold
1692 ev_supported_backends (void)
1694 unsigned int flags = 0;
1696 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1697 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1698 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1699 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1700 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1705 unsigned int ecb_cold
1706 ev_recommended_backends (void)
1708 unsigned int flags = ev_supported_backends ();
1711 /* kqueue is borked on everything but netbsd apparently */
1712 /* it usually doesn't work correctly on anything but sockets and pipes */
1713 flags &= ~EVBACKEND_KQUEUE;
1716 /* only select works correctly on that "unix-certified" platform */
1717 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
1718 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
1721 flags &= ~EVBACKEND_POLL; /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
1727 unsigned int ecb_cold
1728 ev_embeddable_backends (void)
1730 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1732 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1733 if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
1734 flags &= ~EVBACKEND_EPOLL;
1759 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1761 io_blocktime = interval;
1765 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1767 timeout_blocktime = interval;
1771 ev_set_userdata (EV_P_ void *data)
1783 ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P))
1785 invoke_cb = invoke_pending_cb;
1789 ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P))
1791 release_cb = release;
1792 acquire_cb = acquire;
1796 /* initialise a loop structure, must be zero-initialised */
1797 static void noinline ecb_cold
1798 loop_init (EV_P_ unsigned int flags)
1809 if (!clock_gettime (CLOCK_REALTIME, &ts))
1814 #if EV_USE_MONOTONIC
1815 if (!have_monotonic)
1819 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1824 /* pid check not overridable via env */
1826 if (flags & EVFLAG_FORKCHECK)
1830 if (!(flags & EVFLAG_NOENV)
1831 && !enable_secure ()
1832 && getenv ("LIBEV_FLAGS"))
1833 flags = atoi (getenv ("LIBEV_FLAGS"));
1835 ev_rt_now = ev_time ();
1836 mn_now = get_clock ();
1838 rtmn_diff = ev_rt_now - mn_now;
1840 invoke_cb = ev_invoke_pending;
1844 timeout_blocktime = 0.;
1851 pipe_write_skipped = 0;
1852 pipe_write_wanted = 0;
1854 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
1857 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
1860 if (!(flags & EVBACKEND_MASK))
1861 flags |= ev_recommended_backends ();
1864 if (!backend && (flags & EVBACKEND_IOCP )) backend = iocp_init (EV_A_ flags);
1867 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1870 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1873 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1876 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1879 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1882 ev_prepare_init (&pending_w, pendingcb);
1884 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1885 ev_init (&pipe_w, pipecb);
1886 ev_set_priority (&pipe_w, EV_MAXPRI);
1891 /* free up a loop structure */
1893 ev_loop_destroy (EV_P)
1898 /* mimic free (0) */
1903 #if EV_CLEANUP_ENABLE
1904 /* queue cleanup watchers (and execute them) */
1905 if (expect_false (cleanupcnt))
1907 queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
1913 if (ev_is_active (&childev))
1915 ev_ref (EV_A); /* child watcher */
1916 ev_signal_stop (EV_A_ &childev);
1920 if (ev_is_active (&pipe_w))
1923 /*ev_io_stop (EV_A_ &pipe_w);*/
1930 if (evpipe [0] >= 0)
1932 EV_WIN32_CLOSE_FD (evpipe [0]);
1933 EV_WIN32_CLOSE_FD (evpipe [1]);
1938 if (ev_is_active (&sigfd_w))
1947 if (backend_fd >= 0)
1951 if (backend == EVBACKEND_IOCP ) iocp_destroy (EV_A);
1954 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1957 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1960 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1963 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1966 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1969 for (i = NUMPRI; i--; )
1971 array_free (pending, [i]);
1973 array_free (idle, [i]);
1977 ev_free (anfds); anfds = 0; anfdmax = 0;
1979 /* have to use the microsoft-never-gets-it-right macro */
1980 array_free (rfeed, EMPTY);
1981 array_free (fdchange, EMPTY);
1982 array_free (timer, EMPTY);
1983 #if EV_PERIODIC_ENABLE
1984 array_free (periodic, EMPTY);
1987 array_free (fork, EMPTY);
1989 #if EV_CLEANUP_ENABLE
1990 array_free (cleanup, EMPTY);
1992 array_free (prepare, EMPTY);
1993 array_free (check, EMPTY);
1995 array_free (async, EMPTY);
2001 if (ev_is_default_loop (EV_A))
2003 ev_default_loop_ptr = 0;
2011 inline_size void infy_fork (EV_P);
2018 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
2021 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
2024 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
2030 if (ev_is_active (&pipe_w))
2032 /* pipe_write_wanted must be false now, so modifying fd vars should be safe */
2035 ev_io_stop (EV_A_ &pipe_w);
2042 if (evpipe [0] >= 0)
2044 EV_WIN32_CLOSE_FD (evpipe [0]);
2045 EV_WIN32_CLOSE_FD (evpipe [1]);
2048 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2050 /* now iterate over everything, in case we missed something */
2051 pipecb (EV_A_ &pipe_w, EV_READ);
2060 struct ev_loop * ecb_cold
2061 ev_loop_new (unsigned int flags)
2063 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
2065 memset (EV_A, 0, sizeof (struct ev_loop));
2066 loop_init (EV_A_ flags);
2068 if (ev_backend (EV_A))
2075 #endif /* multiplicity */
2078 static void noinline ecb_cold
2079 verify_watcher (EV_P_ W w)
2081 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
2084 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
2087 static void noinline ecb_cold
2088 verify_heap (EV_P_ ANHE *heap, int N)
2092 for (i = HEAP0; i < N + HEAP0; ++i)
2094 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
2095 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
2096 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
2098 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
2102 static void noinline ecb_cold
2103 array_verify (EV_P_ W *ws, int cnt)
2107 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
2108 verify_watcher (EV_A_ ws [cnt]);
2121 assert (activecnt >= -1);
2123 assert (fdchangemax >= fdchangecnt);
2124 for (i = 0; i < fdchangecnt; ++i)
2125 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
2127 assert (anfdmax >= 0);
2128 for (i = 0; i < anfdmax; ++i)
2129 for (w = anfds [i].head; w; w = w->next)
2131 verify_watcher (EV_A_ (W)w);
2132 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
2133 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
2136 assert (timermax >= timercnt);
2137 verify_heap (EV_A_ timers, timercnt);
2139 #if EV_PERIODIC_ENABLE
2140 assert (periodicmax >= periodiccnt);
2141 verify_heap (EV_A_ periodics, periodiccnt);
2144 for (i = NUMPRI; i--; )
2146 assert (pendingmax [i] >= pendingcnt [i]);
2148 assert (idleall >= 0);
2149 assert (idlemax [i] >= idlecnt [i]);
2150 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
2155 assert (forkmax >= forkcnt);
2156 array_verify (EV_A_ (W *)forks, forkcnt);
2159 #if EV_CLEANUP_ENABLE
2160 assert (cleanupmax >= cleanupcnt);
2161 array_verify (EV_A_ (W *)cleanups, cleanupcnt);
2165 assert (asyncmax >= asynccnt);
2166 array_verify (EV_A_ (W *)asyncs, asynccnt);
2169 #if EV_PREPARE_ENABLE
2170 assert (preparemax >= preparecnt);
2171 array_verify (EV_A_ (W *)prepares, preparecnt);
2175 assert (checkmax >= checkcnt);
2176 array_verify (EV_A_ (W *)checks, checkcnt);
2181 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2182 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
2190 struct ev_loop * ecb_cold
2194 ev_default_loop (unsigned int flags)
2196 if (!ev_default_loop_ptr)
2199 EV_P = ev_default_loop_ptr = &default_loop_struct;
2201 ev_default_loop_ptr = 1;
2204 loop_init (EV_A_ flags);
2206 if (ev_backend (EV_A))
2209 ev_signal_init (&childev, childcb, SIGCHLD);
2210 ev_set_priority (&childev, EV_MAXPRI);
2211 ev_signal_start (EV_A_ &childev);
2212 ev_unref (EV_A); /* child watcher should not keep loop alive */
2216 ev_default_loop_ptr = 0;
2219 return ev_default_loop_ptr;
2225 postfork = 1; /* must be in line with ev_default_fork */
2228 /*****************************************************************************/
2231 ev_invoke (EV_P_ void *w, int revents)
2233 EV_CB_INVOKE ((W)w, revents);
2237 ev_pending_count (EV_P)
2240 unsigned int count = 0;
2242 for (pri = NUMPRI; pri--; )
2243 count += pendingcnt [pri];
2249 ev_invoke_pending (EV_P)
2253 for (pri = NUMPRI; pri--; )
2254 while (pendingcnt [pri])
2256 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
2259 EV_CB_INVOKE (p->w, p->events);
2265 /* make idle watchers pending. this handles the "call-idle */
2266 /* only when higher priorities are idle" logic */
2270 if (expect_false (idleall))
2274 for (pri = NUMPRI; pri--; )
2276 if (pendingcnt [pri])
2281 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
2289 /* make timers pending */
2295 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2299 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
2301 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
2303 /* first reschedule or stop timer */
2306 ev_at (w) += w->repeat;
2307 if (ev_at (w) < mn_now)
2310 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
2312 ANHE_at_cache (timers [HEAP0]);
2313 downheap (timers, timercnt, HEAP0);
2316 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
2319 feed_reverse (EV_A_ (W)w);
2321 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
2323 feed_reverse_done (EV_A_ EV_TIMER);
2327 #if EV_PERIODIC_ENABLE
2329 static void noinline
2330 periodic_recalc (EV_P_ ev_periodic *w)
2332 ev_tstamp interval = w->interval > MIN_INTERVAL ? w->interval : MIN_INTERVAL;
2333 ev_tstamp at = w->offset + interval * ev_floor ((ev_rt_now - w->offset) / interval);
2335 /* the above almost always errs on the low side */
2336 while (at <= ev_rt_now)
2338 ev_tstamp nat = at + w->interval;
2340 /* when resolution fails us, we use ev_rt_now */
2341 if (expect_false (nat == at))
2353 /* make periodics pending */
2355 periodics_reify (EV_P)
2359 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2365 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2367 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
2369 /* first reschedule or stop timer */
2370 if (w->reschedule_cb)
2372 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2374 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
2376 ANHE_at_cache (periodics [HEAP0]);
2377 downheap (periodics, periodiccnt, HEAP0);
2379 else if (w->interval)
2381 periodic_recalc (EV_A_ w);
2382 ANHE_at_cache (periodics [HEAP0]);
2383 downheap (periodics, periodiccnt, HEAP0);
2386 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2389 feed_reverse (EV_A_ (W)w);
2391 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
2393 feed_reverse_done (EV_A_ EV_PERIODIC);
2397 /* simply recalculate all periodics */
2398 /* TODO: maybe ensure that at least one event happens when jumping forward? */
2399 static void noinline ecb_cold
2400 periodics_reschedule (EV_P)
2404 /* adjust periodics after time jump */
2405 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
2407 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2409 if (w->reschedule_cb)
2410 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2411 else if (w->interval)
2412 periodic_recalc (EV_A_ w);
2414 ANHE_at_cache (periodics [i]);
2417 reheap (periodics, periodiccnt);
2421 /* adjust all timers by a given offset */
2422 static void noinline ecb_cold
2423 timers_reschedule (EV_P_ ev_tstamp adjust)
2427 for (i = 0; i < timercnt; ++i)
2429 ANHE *he = timers + i + HEAP0;
2430 ANHE_w (*he)->at += adjust;
2431 ANHE_at_cache (*he);
2435 /* fetch new monotonic and realtime times from the kernel */
2436 /* also detect if there was a timejump, and act accordingly */
2438 time_update (EV_P_ ev_tstamp max_block)
2440 #if EV_USE_MONOTONIC
2441 if (expect_true (have_monotonic))
2444 ev_tstamp odiff = rtmn_diff;
2446 mn_now = get_clock ();
2448 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
2449 /* interpolate in the meantime */
2450 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
2452 ev_rt_now = rtmn_diff + mn_now;
2457 ev_rt_now = ev_time ();
2459 /* loop a few times, before making important decisions.
2460 * on the choice of "4": one iteration isn't enough,
2461 * in case we get preempted during the calls to
2462 * ev_time and get_clock. a second call is almost guaranteed
2463 * to succeed in that case, though. and looping a few more times
2464 * doesn't hurt either as we only do this on time-jumps or
2465 * in the unlikely event of having been preempted here.
2470 rtmn_diff = ev_rt_now - mn_now;
2472 diff = odiff - rtmn_diff;
2474 if (expect_true ((diff < 0. ? -diff : diff) < MIN_TIMEJUMP))
2475 return; /* all is well */
2477 ev_rt_now = ev_time ();
2478 mn_now = get_clock ();
2482 /* no timer adjustment, as the monotonic clock doesn't jump */
2483 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
2484 # if EV_PERIODIC_ENABLE
2485 periodics_reschedule (EV_A);
2491 ev_rt_now = ev_time ();
2493 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
2495 /* adjust timers. this is easy, as the offset is the same for all of them */
2496 timers_reschedule (EV_A_ ev_rt_now - mn_now);
2497 #if EV_PERIODIC_ENABLE
2498 periodics_reschedule (EV_A);
2507 ev_run (EV_P_ int flags)
2513 assert (("libev: ev_loop recursion during release detected", loop_done != EVBREAK_RECURSE));
2515 loop_done = EVBREAK_CANCEL;
2517 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
2526 if (expect_false (curpid)) /* penalise the forking check even more */
2527 if (expect_false (getpid () != curpid))
2535 /* we might have forked, so queue fork handlers */
2536 if (expect_false (postfork))
2539 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
2544 #if EV_PREPARE_ENABLE
2545 /* queue prepare watchers (and execute them) */
2546 if (expect_false (preparecnt))
2548 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
2553 if (expect_false (loop_done))
2556 /* we might have forked, so reify kernel state if necessary */
2557 if (expect_false (postfork))
2560 /* update fd-related kernel structures */
2563 /* calculate blocking time */
2565 ev_tstamp waittime = 0.;
2566 ev_tstamp sleeptime = 0.;
2568 /* remember old timestamp for io_blocktime calculation */
2569 ev_tstamp prev_mn_now = mn_now;
2571 /* update time to cancel out callback processing overhead */
2572 time_update (EV_A_ 1e100);
2574 /* from now on, we want a pipe-wake-up */
2575 pipe_write_wanted = 1;
2577 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt || pipe_write_skipped)))
2579 waittime = MAX_BLOCKTIME;
2583 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now;
2584 if (waittime > to) waittime = to;
2587 #if EV_PERIODIC_ENABLE
2590 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now;
2591 if (waittime > to) waittime = to;
2595 /* don't let timeouts decrease the waittime below timeout_blocktime */
2596 if (expect_false (waittime < timeout_blocktime))
2597 waittime = timeout_blocktime;
2599 /* at this point, we NEED to wait, so we have to ensure */
2600 /* to pass a minimum nonzero value to the backend */
2601 if (expect_false (waittime < backend_mintime))
2602 waittime = backend_mintime;
2604 /* extra check because io_blocktime is commonly 0 */
2605 if (expect_false (io_blocktime))
2607 sleeptime = io_blocktime - (mn_now - prev_mn_now);
2609 if (sleeptime > waittime - backend_mintime)
2610 sleeptime = waittime - backend_mintime;
2612 if (expect_true (sleeptime > 0.))
2614 ev_sleep (sleeptime);
2615 waittime -= sleeptime;
2623 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
2624 backend_poll (EV_A_ waittime);
2625 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
2627 pipe_write_wanted = 0;
2629 if (pipe_write_skipped)
2631 assert (("libev: pipe_w not active, but pipe not written", ev_is_active (&pipe_w)));
2632 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
2636 /* update ev_rt_now, do magic */
2637 time_update (EV_A_ waittime + sleeptime);
2640 /* queue pending timers and reschedule them */
2641 timers_reify (EV_A); /* relative timers called last */
2642 #if EV_PERIODIC_ENABLE
2643 periodics_reify (EV_A); /* absolute timers called first */
2647 /* queue idle watchers unless other events are pending */
2652 /* queue check watchers, to be executed first */
2653 if (expect_false (checkcnt))
2654 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
2659 while (expect_true (
2662 && !(flags & (EVRUN_ONCE | EVRUN_NOWAIT))
2665 if (loop_done == EVBREAK_ONE)
2666 loop_done = EVBREAK_CANCEL;
2674 ev_break (EV_P_ int how)
2692 ev_now_update (EV_P)
2694 time_update (EV_A_ 1e100);
2700 ev_now_update (EV_A);
2706 ev_tstamp mn_prev = mn_now;
2708 ev_now_update (EV_A);
2709 timers_reschedule (EV_A_ mn_now - mn_prev);
2710 #if EV_PERIODIC_ENABLE
2711 /* TODO: really do this? */
2712 periodics_reschedule (EV_A);
2716 /*****************************************************************************/
2717 /* singly-linked list management, used when the expected list length is short */
2720 wlist_add (WL *head, WL elem)
2727 wlist_del (WL *head, WL elem)
2731 if (expect_true (*head == elem))
2737 head = &(*head)->next;
2741 /* internal, faster, version of ev_clear_pending */
2743 clear_pending (EV_P_ W w)
2747 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
2753 ev_clear_pending (EV_P_ void *w)
2756 int pending = w_->pending;
2758 if (expect_true (pending))
2760 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
2761 p->w = (W)&pending_w;
2770 pri_adjust (EV_P_ W w)
2772 int pri = ev_priority (w);
2773 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
2774 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
2775 ev_set_priority (w, pri);
2779 ev_start (EV_P_ W w, int active)
2781 pri_adjust (EV_A_ w);
2793 /*****************************************************************************/
2796 ev_io_start (EV_P_ ev_io *w)
2800 if (expect_false (ev_is_active (w)))
2803 assert (("libev: ev_io_start called with negative fd", fd >= 0));
2804 assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
2808 ev_start (EV_A_ (W)w, 1);
2809 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
2810 wlist_add (&anfds[fd].head, (WL)w);
2812 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
2813 w->events &= ~EV__IOFDSET;
2819 ev_io_stop (EV_P_ ev_io *w)
2821 clear_pending (EV_A_ (W)w);
2822 if (expect_false (!ev_is_active (w)))
2825 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
2829 wlist_del (&anfds[w->fd].head, (WL)w);
2830 ev_stop (EV_A_ (W)w);
2832 fd_change (EV_A_ w->fd, EV_ANFD_REIFY);
2838 ev_timer_start (EV_P_ ev_timer *w)
2840 if (expect_false (ev_is_active (w)))
2843 ev_at (w) += mn_now;
2845 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
2850 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
2851 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
2852 ANHE_w (timers [ev_active (w)]) = (WT)w;
2853 ANHE_at_cache (timers [ev_active (w)]);
2854 upheap (timers, ev_active (w));
2858 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
2862 ev_timer_stop (EV_P_ ev_timer *w)
2864 clear_pending (EV_A_ (W)w);
2865 if (expect_false (!ev_is_active (w)))
2871 int active = ev_active (w);
2873 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
2877 if (expect_true (active < timercnt + HEAP0))
2879 timers [active] = timers [timercnt + HEAP0];
2880 adjustheap (timers, timercnt, active);
2884 ev_at (w) -= mn_now;
2886 ev_stop (EV_A_ (W)w);
2892 ev_timer_again (EV_P_ ev_timer *w)
2896 if (ev_is_active (w))
2900 ev_at (w) = mn_now + w->repeat;
2901 ANHE_at_cache (timers [ev_active (w)]);
2902 adjustheap (timers, timercnt, ev_active (w));
2905 ev_timer_stop (EV_A_ w);
2909 ev_at (w) = w->repeat;
2910 ev_timer_start (EV_A_ w);
2917 ev_timer_remaining (EV_P_ ev_timer *w)
2919 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
2922 #if EV_PERIODIC_ENABLE
2924 ev_periodic_start (EV_P_ ev_periodic *w)
2926 if (expect_false (ev_is_active (w)))
2929 if (w->reschedule_cb)
2930 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2931 else if (w->interval)
2933 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
2934 periodic_recalc (EV_A_ w);
2937 ev_at (w) = w->offset;
2942 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
2943 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
2944 ANHE_w (periodics [ev_active (w)]) = (WT)w;
2945 ANHE_at_cache (periodics [ev_active (w)]);
2946 upheap (periodics, ev_active (w));
2950 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
2954 ev_periodic_stop (EV_P_ ev_periodic *w)
2956 clear_pending (EV_A_ (W)w);
2957 if (expect_false (!ev_is_active (w)))
2963 int active = ev_active (w);
2965 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
2969 if (expect_true (active < periodiccnt + HEAP0))
2971 periodics [active] = periodics [periodiccnt + HEAP0];
2972 adjustheap (periodics, periodiccnt, active);
2976 ev_stop (EV_A_ (W)w);
2982 ev_periodic_again (EV_P_ ev_periodic *w)
2984 /* TODO: use adjustheap and recalculation */
2985 ev_periodic_stop (EV_A_ w);
2986 ev_periodic_start (EV_A_ w);
2991 # define SA_RESTART 0
2994 #if EV_SIGNAL_ENABLE
2997 ev_signal_start (EV_P_ ev_signal *w)
2999 if (expect_false (ev_is_active (w)))
3002 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
3005 assert (("libev: a signal must not be attached to two different loops",
3006 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
3008 signals [w->signum - 1].loop = EV_A;
3016 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
3017 if (sigfd < 0 && errno == EINVAL)
3018 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
3022 fd_intern (sigfd); /* doing it twice will not hurt */
3024 sigemptyset (&sigfd_set);
3026 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
3027 ev_set_priority (&sigfd_w, EV_MAXPRI);
3028 ev_io_start (EV_A_ &sigfd_w);
3029 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
3035 /* TODO: check .head */
3036 sigaddset (&sigfd_set, w->signum);
3037 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
3039 signalfd (sigfd, &sigfd_set, 0);
3043 ev_start (EV_A_ (W)w, 1);
3044 wlist_add (&signals [w->signum - 1].head, (WL)w);
3047 # if EV_USE_SIGNALFD
3048 if (sigfd < 0) /*TODO*/
3054 signal (w->signum, ev_sighandler);
3056 struct sigaction sa;
3060 sa.sa_handler = ev_sighandler;
3061 sigfillset (&sa.sa_mask);
3062 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
3063 sigaction (w->signum, &sa, 0);
3065 if (origflags & EVFLAG_NOSIGMASK)
3067 sigemptyset (&sa.sa_mask);
3068 sigaddset (&sa.sa_mask, w->signum);
3069 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
3078 ev_signal_stop (EV_P_ ev_signal *w)
3080 clear_pending (EV_A_ (W)w);
3081 if (expect_false (!ev_is_active (w)))
3086 wlist_del (&signals [w->signum - 1].head, (WL)w);
3087 ev_stop (EV_A_ (W)w);
3089 if (!signals [w->signum - 1].head)
3092 signals [w->signum - 1].loop = 0; /* unattach from signal */
3100 sigaddset (&ss, w->signum);
3101 sigdelset (&sigfd_set, w->signum);
3103 signalfd (sigfd, &sigfd_set, 0);
3104 sigprocmask (SIG_UNBLOCK, &ss, 0);
3108 signal (w->signum, SIG_DFL);
3119 ev_child_start (EV_P_ ev_child *w)
3122 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
3124 if (expect_false (ev_is_active (w)))
3129 ev_start (EV_A_ (W)w, 1);
3130 wlist_add (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3136 ev_child_stop (EV_P_ ev_child *w)
3138 clear_pending (EV_A_ (W)w);
3139 if (expect_false (!ev_is_active (w)))
3144 wlist_del (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3145 ev_stop (EV_A_ (W)w);
3156 # define lstat(a,b) _stati64 (a,b)
3159 #define DEF_STAT_INTERVAL 5.0074891
3160 #define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
3161 #define MIN_STAT_INTERVAL 0.1074891
3163 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
3167 /* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
3168 # define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
3170 static void noinline
3171 infy_add (EV_P_ ev_stat *w)
3173 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);
3179 /* now local changes will be tracked by inotify, but remote changes won't */
3180 /* unless the filesystem is known to be local, we therefore still poll */
3181 /* also do poll on <2.6.25, but with normal frequency */
3184 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3185 else if (!statfs (w->path, &sfs)
3186 && (sfs.f_type == 0x1373 /* devfs */
3187 || sfs.f_type == 0xEF53 /* ext2/3 */
3188 || sfs.f_type == 0x3153464a /* jfs */
3189 || sfs.f_type == 0x52654973 /* reiser3 */
3190 || sfs.f_type == 0x01021994 /* tempfs */
3191 || sfs.f_type == 0x58465342 /* xfs */))
3192 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
3194 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
3198 /* can't use inotify, continue to stat */
3199 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3201 /* if path is not there, monitor some parent directory for speedup hints */
3202 /* note that exceeding the hardcoded path limit is not a correctness issue, */
3203 /* but an efficiency issue only */
3204 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
3207 strcpy (path, w->path);
3211 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
3212 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
3214 char *pend = strrchr (path, '/');
3216 if (!pend || pend == path)
3220 w->wd = inotify_add_watch (fs_fd, path, mask);
3222 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
3227 wlist_add (&fs_hash [w->wd & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3229 /* now re-arm timer, if required */
3230 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3231 ev_timer_again (EV_A_ &w->timer);
3232 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3235 static void noinline
3236 infy_del (EV_P_ ev_stat *w)
3245 slot = wd & ((EV_INOTIFY_HASHSIZE) - 1);
3246 wlist_del (&fs_hash [slot].head, (WL)w);
3248 /* remove this watcher, if others are watching it, they will rearm */
3249 inotify_rm_watch (fs_fd, wd);
3252 static void noinline
3253 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
3256 /* overflow, need to check for all hash slots */
3257 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3258 infy_wd (EV_A_ slot, wd, ev);
3263 for (w_ = fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head; w_; )
3265 ev_stat *w = (ev_stat *)w_;
3266 w_ = w_->next; /* lets us remove this watcher and all before it */
3268 if (w->wd == wd || wd == -1)
3270 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
3272 wlist_del (&fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3274 infy_add (EV_A_ w); /* re-add, no matter what */
3277 stat_timer_cb (EV_A_ &w->timer, 0);
3284 infy_cb (EV_P_ ev_io *w, int revents)
3286 char buf [EV_INOTIFY_BUFSIZE];
3288 int len = read (fs_fd, buf, sizeof (buf));
3290 for (ofs = 0; ofs < len; )
3292 struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
3293 infy_wd (EV_A_ ev->wd, ev->wd, ev);
3294 ofs += sizeof (struct inotify_event) + ev->len;
3298 inline_size void ecb_cold
3299 ev_check_2625 (EV_P)
3301 /* kernels < 2.6.25 are borked
3302 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
3304 if (ev_linux_version () < 0x020619)
3313 #if defined (IN_CLOEXEC) && defined (IN_NONBLOCK)
3314 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3318 return inotify_init ();
3329 ev_check_2625 (EV_A);
3331 fs_fd = infy_newfd ();
3336 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3337 ev_set_priority (&fs_w, EV_MAXPRI);
3338 ev_io_start (EV_A_ &fs_w);
3352 ev_io_stop (EV_A_ &fs_w);
3354 fs_fd = infy_newfd ();
3359 ev_io_set (&fs_w, fs_fd, EV_READ);
3360 ev_io_start (EV_A_ &fs_w);
3364 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3366 WL w_ = fs_hash [slot].head;
3367 fs_hash [slot].head = 0;
3371 ev_stat *w = (ev_stat *)w_;
3372 w_ = w_->next; /* lets us add this watcher */
3377 infy_add (EV_A_ w); /* re-add, no matter what */
3380 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3381 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3382 ev_timer_again (EV_A_ &w->timer);
3383 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3392 # define EV_LSTAT(p,b) _stati64 (p, b)
3394 # define EV_LSTAT(p,b) lstat (p, b)
3398 ev_stat_stat (EV_P_ ev_stat *w)
3400 if (lstat (w->path, &w->attr) < 0)
3401 w->attr.st_nlink = 0;
3402 else if (!w->attr.st_nlink)
3403 w->attr.st_nlink = 1;
3406 static void noinline
3407 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3409 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3411 ev_statdata prev = w->attr;
3412 ev_stat_stat (EV_A_ w);
3414 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3416 prev.st_dev != w->attr.st_dev
3417 || prev.st_ino != w->attr.st_ino
3418 || prev.st_mode != w->attr.st_mode
3419 || prev.st_nlink != w->attr.st_nlink
3420 || prev.st_uid != w->attr.st_uid
3421 || prev.st_gid != w->attr.st_gid
3422 || prev.st_rdev != w->attr.st_rdev
3423 || prev.st_size != w->attr.st_size
3424 || prev.st_atime != w->attr.st_atime
3425 || prev.st_mtime != w->attr.st_mtime
3426 || prev.st_ctime != w->attr.st_ctime
3428 /* we only update w->prev on actual differences */
3429 /* in case we test more often than invoke the callback, */
3430 /* to ensure that prev is always different to attr */
3438 ev_stat_stat (EV_A_ w); /* avoid race... */
3442 ev_feed_event (EV_A_ w, EV_STAT);
3447 ev_stat_start (EV_P_ ev_stat *w)
3449 if (expect_false (ev_is_active (w)))
3452 ev_stat_stat (EV_A_ w);
3454 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3455 w->interval = MIN_STAT_INTERVAL;
3457 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3458 ev_set_priority (&w->timer, ev_priority (w));
3468 ev_timer_again (EV_A_ &w->timer);
3472 ev_start (EV_A_ (W)w, 1);
3478 ev_stat_stop (EV_P_ ev_stat *w)
3480 clear_pending (EV_A_ (W)w);
3481 if (expect_false (!ev_is_active (w)))
3490 if (ev_is_active (&w->timer))
3493 ev_timer_stop (EV_A_ &w->timer);
3496 ev_stop (EV_A_ (W)w);
3504 ev_idle_start (EV_P_ ev_idle *w)
3506 if (expect_false (ev_is_active (w)))
3509 pri_adjust (EV_A_ (W)w);
3514 int active = ++idlecnt [ABSPRI (w)];
3517 ev_start (EV_A_ (W)w, active);
3519 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
3520 idles [ABSPRI (w)][active - 1] = w;
3527 ev_idle_stop (EV_P_ ev_idle *w)
3529 clear_pending (EV_A_ (W)w);
3530 if (expect_false (!ev_is_active (w)))
3536 int active = ev_active (w);
3538 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
3539 ev_active (idles [ABSPRI (w)][active - 1]) = active;
3541 ev_stop (EV_A_ (W)w);
3549 #if EV_PREPARE_ENABLE
3551 ev_prepare_start (EV_P_ ev_prepare *w)
3553 if (expect_false (ev_is_active (w)))
3558 ev_start (EV_A_ (W)w, ++preparecnt);
3559 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
3560 prepares [preparecnt - 1] = w;
3566 ev_prepare_stop (EV_P_ ev_prepare *w)
3568 clear_pending (EV_A_ (W)w);
3569 if (expect_false (!ev_is_active (w)))
3575 int active = ev_active (w);
3577 prepares [active - 1] = prepares [--preparecnt];
3578 ev_active (prepares [active - 1]) = active;
3581 ev_stop (EV_A_ (W)w);
3589 ev_check_start (EV_P_ ev_check *w)
3591 if (expect_false (ev_is_active (w)))
3596 ev_start (EV_A_ (W)w, ++checkcnt);
3597 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
3598 checks [checkcnt - 1] = w;
3604 ev_check_stop (EV_P_ ev_check *w)
3606 clear_pending (EV_A_ (W)w);
3607 if (expect_false (!ev_is_active (w)))
3613 int active = ev_active (w);
3615 checks [active - 1] = checks [--checkcnt];
3616 ev_active (checks [active - 1]) = active;
3619 ev_stop (EV_A_ (W)w);
3627 ev_embed_sweep (EV_P_ ev_embed *w)
3629 ev_run (w->other, EVRUN_NOWAIT);
3633 embed_io_cb (EV_P_ ev_io *io, int revents)
3635 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
3638 ev_feed_event (EV_A_ (W)w, EV_EMBED);
3640 ev_run (w->other, EVRUN_NOWAIT);
3644 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
3646 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
3654 ev_run (EV_A_ EVRUN_NOWAIT);
3660 embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
3662 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
3664 ev_embed_stop (EV_A_ w);
3669 ev_loop_fork (EV_A);
3670 ev_run (EV_A_ EVRUN_NOWAIT);
3673 ev_embed_start (EV_A_ w);
3678 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
3680 ev_idle_stop (EV_A_ idle);
3685 ev_embed_start (EV_P_ ev_embed *w)
3687 if (expect_false (ev_is_active (w)))
3692 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
3693 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
3698 ev_set_priority (&w->io, ev_priority (w));
3699 ev_io_start (EV_A_ &w->io);
3701 ev_prepare_init (&w->prepare, embed_prepare_cb);
3702 ev_set_priority (&w->prepare, EV_MINPRI);
3703 ev_prepare_start (EV_A_ &w->prepare);
3705 ev_fork_init (&w->fork, embed_fork_cb);
3706 ev_fork_start (EV_A_ &w->fork);
3708 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
3710 ev_start (EV_A_ (W)w, 1);
3716 ev_embed_stop (EV_P_ ev_embed *w)
3718 clear_pending (EV_A_ (W)w);
3719 if (expect_false (!ev_is_active (w)))
3724 ev_io_stop (EV_A_ &w->io);
3725 ev_prepare_stop (EV_A_ &w->prepare);
3726 ev_fork_stop (EV_A_ &w->fork);
3728 ev_stop (EV_A_ (W)w);
3736 ev_fork_start (EV_P_ ev_fork *w)
3738 if (expect_false (ev_is_active (w)))
3743 ev_start (EV_A_ (W)w, ++forkcnt);
3744 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
3745 forks [forkcnt - 1] = w;
3751 ev_fork_stop (EV_P_ ev_fork *w)
3753 clear_pending (EV_A_ (W)w);
3754 if (expect_false (!ev_is_active (w)))
3760 int active = ev_active (w);
3762 forks [active - 1] = forks [--forkcnt];
3763 ev_active (forks [active - 1]) = active;
3766 ev_stop (EV_A_ (W)w);
3772 #if EV_CLEANUP_ENABLE
3774 ev_cleanup_start (EV_P_ ev_cleanup *w)
3776 if (expect_false (ev_is_active (w)))
3781 ev_start (EV_A_ (W)w, ++cleanupcnt);
3782 array_needsize (ev_cleanup *, cleanups, cleanupmax, cleanupcnt, EMPTY2);
3783 cleanups [cleanupcnt - 1] = w;
3785 /* cleanup watchers should never keep a refcount on the loop */
3791 ev_cleanup_stop (EV_P_ ev_cleanup *w)
3793 clear_pending (EV_A_ (W)w);
3794 if (expect_false (!ev_is_active (w)))
3801 int active = ev_active (w);
3803 cleanups [active - 1] = cleanups [--cleanupcnt];
3804 ev_active (cleanups [active - 1]) = active;
3807 ev_stop (EV_A_ (W)w);
3815 ev_async_start (EV_P_ ev_async *w)
3817 if (expect_false (ev_is_active (w)))
3826 ev_start (EV_A_ (W)w, ++asynccnt);
3827 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
3828 asyncs [asynccnt - 1] = w;
3834 ev_async_stop (EV_P_ ev_async *w)
3836 clear_pending (EV_A_ (W)w);
3837 if (expect_false (!ev_is_active (w)))
3843 int active = ev_active (w);
3845 asyncs [active - 1] = asyncs [--asynccnt];
3846 ev_active (asyncs [active - 1]) = active;
3849 ev_stop (EV_A_ (W)w);
3855 ev_async_send (EV_P_ ev_async *w)
3858 evpipe_write (EV_A_ &async_pending);
3862 /*****************************************************************************/
3868 void (*cb)(int revents, void *arg);
3873 once_cb (EV_P_ struct ev_once *once, int revents)
3875 void (*cb)(int revents, void *arg) = once->cb;
3876 void *arg = once->arg;
3878 ev_io_stop (EV_A_ &once->io);
3879 ev_timer_stop (EV_A_ &once->to);
3886 once_cb_io (EV_P_ ev_io *w, int revents)
3888 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
3890 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
3894 once_cb_to (EV_P_ ev_timer *w, int revents)
3896 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
3898 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
3902 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
3904 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
3906 if (expect_false (!once))
3908 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMER, arg);
3915 ev_init (&once->io, once_cb_io);
3918 ev_io_set (&once->io, fd, events);
3919 ev_io_start (EV_A_ &once->io);
3922 ev_init (&once->to, once_cb_to);
3925 ev_timer_set (&once->to, timeout, 0.);
3926 ev_timer_start (EV_A_ &once->to);
3930 /*****************************************************************************/
3934 ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
3937 ev_watcher_list *wl, *wn;
3939 if (types & (EV_IO | EV_EMBED))
3940 for (i = 0; i < anfdmax; ++i)
3941 for (wl = anfds [i].head; wl; )
3946 if (ev_cb ((ev_io *)wl) == embed_io_cb)
3948 if (types & EV_EMBED)
3949 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
3954 if (ev_cb ((ev_io *)wl) == infy_cb)
3958 if ((ev_io *)wl != &pipe_w)
3960 cb (EV_A_ EV_IO, wl);
3965 if (types & (EV_TIMER | EV_STAT))
3966 for (i = timercnt + HEAP0; i-- > HEAP0; )
3968 /*TODO: timer is not always active*/
3969 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
3971 if (types & EV_STAT)
3972 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
3976 if (types & EV_TIMER)
3977 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
3979 #if EV_PERIODIC_ENABLE
3980 if (types & EV_PERIODIC)
3981 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
3982 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
3986 if (types & EV_IDLE)
3987 for (j = NUMPRI; i--; )
3988 for (i = idlecnt [j]; i--; )
3989 cb (EV_A_ EV_IDLE, idles [j][i]);
3993 if (types & EV_FORK)
3994 for (i = forkcnt; i--; )
3995 if (ev_cb (forks [i]) != embed_fork_cb)
3996 cb (EV_A_ EV_FORK, forks [i]);
4000 if (types & EV_ASYNC)
4001 for (i = asynccnt; i--; )
4002 cb (EV_A_ EV_ASYNC, asyncs [i]);
4005 #if EV_PREPARE_ENABLE
4006 if (types & EV_PREPARE)
4007 for (i = preparecnt; i--; )
4008 # if EV_EMBED_ENABLE
4009 if (ev_cb (prepares [i]) != embed_prepare_cb)
4011 cb (EV_A_ EV_PREPARE, prepares [i]);
4015 if (types & EV_CHECK)
4016 for (i = checkcnt; i--; )
4017 cb (EV_A_ EV_CHECK, checks [i]);
4020 #if EV_SIGNAL_ENABLE
4021 if (types & EV_SIGNAL)
4022 for (i = 0; i < EV_NSIG - 1; ++i)
4023 for (wl = signals [i].head; wl; )
4026 cb (EV_A_ EV_SIGNAL, wl);
4032 if (types & EV_CHILD)
4033 for (i = (EV_PID_HASHSIZE); i--; )
4034 for (wl = childs [i]; wl; )
4037 cb (EV_A_ EV_CHILD, wl);
4041 /* EV_STAT 0x00001000 /* stat data changed */
4042 /* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
4047 #include "ev_wrap.h"