1 /* Copyright (C) 2000, 2003, 2004 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Kaz Kylheku <kaz@ashi.footprints.net>.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public License as
7 published by the Free Software Foundation; either version 2.1 of the
8 License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
26 #include "posix-timer.h"
29 /* Create new per-process timer using CLOCK. */
37 struct timer_node *newtimer = NULL;
38 struct thread_node *thread = NULL;
41 #if defined _POSIX_CPUTIME && _POSIX_CPUTIME >= 0
42 || clock_id == CLOCK_PROCESS_CPUTIME_ID
44 #if defined _POSIX_THREAD_CPUTIME && _POSIX_THREAD_CPUTIME >= 0
45 || clock_id == CLOCK_THREAD_CPUTIME_ID
49 /* We don't allow timers for CPU clocks. At least not in the
51 __set_errno (ENOTSUP);
55 if (clock_id != CLOCK_REALTIME)
61 pthread_once (&__timer_init_once_control, __timer_init_once);
63 if (__timer_init_failed)
69 pthread_mutex_lock (&__timer_mutex);
71 newtimer = __timer_alloc ();
72 if (__builtin_expect (newtimer == NULL, 0))
79 newtimer->event = *evp;
82 newtimer->event.sigev_notify = SIGEV_SIGNAL;
83 newtimer->event.sigev_signo = SIGALRM;
84 newtimer->event.sigev_value.sival_ptr = timer_ptr2id (newtimer);
85 newtimer->event.sigev_notify_function = 0;
88 newtimer->event.sigev_notify_attributes = &newtimer->attr;
89 newtimer->creator_pid = getpid ();
91 switch (__builtin_expect (newtimer->event.sigev_notify, SIGEV_SIGNAL))
95 /* We have a global thread for delivering timed signals.
96 If it is not running, try to start it up. */
97 thread = &__timer_signal_thread_rclk;
100 if (__builtin_expect (__timer_thread_start (thread),
103 __set_errno (EAGAIN);
110 /* Copy over thread attributes or set up default ones. */
111 if (evp->sigev_notify_attributes)
112 newtimer->attr = *(pthread_attr_t *) evp->sigev_notify_attributes;
114 pthread_attr_init (&newtimer->attr);
116 /* Ensure thread attributes call for deatched thread. */
117 pthread_attr_setdetachstate (&newtimer->attr, PTHREAD_CREATE_DETACHED);
119 /* Try to find existing thread having the right attributes. */
120 thread = __timer_thread_find_matching (&newtimer->attr, clock_id);
122 /* If no existing thread has these attributes, try to allocate one. */
124 thread = __timer_thread_alloc (&newtimer->attr, clock_id);
126 /* Out of luck; no threads are available. */
127 if (__builtin_expect (thread == NULL, 0))
129 __set_errno (EAGAIN);
133 /* If the thread is not running already, try to start it. */
135 && __builtin_expect (! __timer_thread_start (thread), 0))
137 __set_errno (EAGAIN);
143 __set_errno (EINVAL);
147 newtimer->clock = clock_id;
148 newtimer->abstime = 0;
150 newtimer->thread = thread;
152 *timerid = timer_ptr2id (newtimer);
155 if (__builtin_expect (retval, 0) == -1)
159 __timer_thread_dealloc (thread);
160 if (newtimer != NULL)
162 timer_delref (newtimer);
163 __timer_dealloc (newtimer);
167 pthread_mutex_unlock (&__timer_mutex);