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
17 not, see <http://www.gnu.org/licenses/>. */
25 #include "posix-timer.h"
28 /* Create new per-process timer using CLOCK. */
36 struct timer_node *newtimer = NULL;
37 struct thread_node *thread = NULL;
40 #if defined _POSIX_CPUTIME && _POSIX_CPUTIME >= 0
41 || clock_id == CLOCK_PROCESS_CPUTIME_ID
43 #if defined _POSIX_THREAD_CPUTIME && _POSIX_THREAD_CPUTIME >= 0
44 || clock_id == CLOCK_THREAD_CPUTIME_ID
48 /* We don't allow timers for CPU clocks. At least not in the
50 __set_errno (ENOTSUP);
54 if (clock_id != CLOCK_REALTIME)
60 pthread_once (&__timer_init_once_control, __timer_init_once);
62 if (__timer_init_failed)
68 pthread_mutex_lock (&__timer_mutex);
70 newtimer = __timer_alloc ();
71 if (__builtin_expect (newtimer == NULL, 0))
78 newtimer->event = *evp;
81 newtimer->event.sigev_notify = SIGEV_SIGNAL;
82 newtimer->event.sigev_signo = SIGALRM;
83 newtimer->event.sigev_value.sival_ptr = timer_ptr2id (newtimer);
84 newtimer->event.sigev_notify_function = 0;
87 newtimer->event.sigev_notify_attributes = &newtimer->attr;
88 newtimer->creator_pid = getpid ();
90 switch (__builtin_expect (newtimer->event.sigev_notify, SIGEV_SIGNAL))
94 /* We have a global thread for delivering timed signals.
95 If it is not running, try to start it up. */
96 thread = &__timer_signal_thread_rclk;
99 if (__builtin_expect (__timer_thread_start (thread),
102 __set_errno (EAGAIN);
109 /* Copy over thread attributes or set up default ones. */
110 if (evp->sigev_notify_attributes)
111 newtimer->attr = *(pthread_attr_t *) evp->sigev_notify_attributes;
113 pthread_attr_init (&newtimer->attr);
115 /* Ensure thread attributes call for deatched thread. */
116 pthread_attr_setdetachstate (&newtimer->attr, PTHREAD_CREATE_DETACHED);
118 /* Try to find existing thread having the right attributes. */
119 thread = __timer_thread_find_matching (&newtimer->attr, clock_id);
121 /* If no existing thread has these attributes, try to allocate one. */
123 thread = __timer_thread_alloc (&newtimer->attr, clock_id);
125 /* Out of luck; no threads are available. */
126 if (__builtin_expect (thread == NULL, 0))
128 __set_errno (EAGAIN);
132 /* If the thread is not running already, try to start it. */
134 && __builtin_expect (! __timer_thread_start (thread), 0))
136 __set_errno (EAGAIN);
142 __set_errno (EINVAL);
146 newtimer->clock = clock_id;
147 newtimer->abstime = 0;
149 newtimer->thread = thread;
151 *timerid = timer_ptr2id (newtimer);
154 if (__builtin_expect (retval, 0) == -1)
158 __timer_thread_dealloc (thread);
159 if (newtimer != NULL)
161 timer_delref (newtimer);
162 __timer_dealloc (newtimer);
166 pthread_mutex_unlock (&__timer_mutex);