1 /* Copyright (C) 2000, 2001 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/>. */
23 #include "posix-timer.h"
26 /* Set timer TIMERID to VALUE, returning old value in OVLAUE. */
28 timer_settime (timerid, flags, value, ovalue)
31 const struct itimerspec *value;
32 struct itimerspec *ovalue;
34 struct timer_node *timer;
35 struct thread_node *thread = NULL;
37 int have_now = 0, need_wakeup = 0;
40 timer = timer_id2ptr (timerid);
47 if (value->it_interval.tv_nsec < 0
48 || value->it_interval.tv_nsec >= 1000000000
49 || value->it_value.tv_nsec < 0
50 || value->it_value.tv_nsec >= 1000000000)
56 /* Will need to know current time since this is a relative timer;
57 might as well make the system call outside of the lock now! */
59 if ((flags & TIMER_ABSTIME) == 0)
61 clock_gettime (timer->clock, &now);
65 pthread_mutex_lock (&__timer_mutex);
68 /* One final check of timer validity; this one is possible only
69 until we have the mutex, because it accesses the inuse flag. */
71 if (! timer_valid(timer))
79 ovalue->it_interval = timer->value.it_interval;
85 pthread_mutex_unlock (&__timer_mutex);
86 clock_gettime (timer->clock, &now);
88 pthread_mutex_lock (&__timer_mutex);
92 timespec_sub (&ovalue->it_value, &timer->expirytime, &now);
96 ovalue->it_value.tv_sec = 0;
97 ovalue->it_value.tv_nsec = 0;
101 timer->value = *value;
103 list_unlink_ip (&timer->links);
106 thread = timer->thread;
108 /* A value of { 0, 0 } causes the timer to be stopped. */
109 if (value->it_value.tv_sec != 0
110 || __builtin_expect (value->it_value.tv_nsec != 0, 1))
112 if ((flags & TIMER_ABSTIME) != 0)
113 /* The user specified the expiration time. */
114 timer->expirytime = value->it_value;
116 timespec_add (&timer->expirytime, &now, &value->it_value);
118 /* Only need to wake up the thread if timer is inserted
119 at the head of the queue. */
121 need_wakeup = __timer_thread_queue_timer (thread, timer);
128 timer_delref (timer);
129 pthread_mutex_unlock (&__timer_mutex);
132 if (thread != NULL && need_wakeup)
133 __timer_thread_wakeup (thread);