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 not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
24 #include "posix-timer.h"
27 /* Set timer TIMERID to VALUE, returning old value in OVLAUE. */
29 timer_settime (timerid, flags, value, ovalue)
32 const struct itimerspec *value;
33 struct itimerspec *ovalue;
35 struct timer_node *timer;
36 struct thread_node *thread = NULL;
38 int have_now = 0, need_wakeup = 0;
41 timer = timer_id2ptr (timerid);
48 if (value->it_interval.tv_nsec < 0
49 || value->it_interval.tv_nsec >= 1000000000
50 || value->it_value.tv_nsec < 0
51 || value->it_value.tv_nsec >= 1000000000)
57 /* Will need to know current time since this is a relative timer;
58 might as well make the system call outside of the lock now! */
60 if ((flags & TIMER_ABSTIME) == 0)
62 clock_gettime (timer->clock, &now);
66 pthread_mutex_lock (&__timer_mutex);
69 /* One final check of timer validity; this one is possible only
70 until we have the mutex, because it accesses the inuse flag. */
72 if (! timer_valid(timer))
80 ovalue->it_interval = timer->value.it_interval;
86 pthread_mutex_unlock (&__timer_mutex);
87 clock_gettime (timer->clock, &now);
89 pthread_mutex_lock (&__timer_mutex);
93 timespec_sub (&ovalue->it_value, &timer->expirytime, &now);
97 ovalue->it_value.tv_sec = 0;
98 ovalue->it_value.tv_nsec = 0;
102 timer->value = *value;
104 list_unlink_ip (&timer->links);
107 thread = timer->thread;
109 /* A value of { 0, 0 } causes the timer to be stopped. */
110 if (value->it_value.tv_sec != 0
111 || __builtin_expect (value->it_value.tv_nsec != 0, 1))
113 if ((flags & TIMER_ABSTIME) != 0)
114 /* The user specified the expiration time. */
115 timer->expirytime = value->it_value;
117 timespec_add (&timer->expirytime, &now, &value->it_value);
119 /* Only need to wake up the thread if timer is inserted
120 at the head of the queue. */
122 need_wakeup = __timer_thread_queue_timer (thread, timer);
129 timer_delref (timer);
130 pthread_mutex_unlock (&__timer_mutex);
133 if (thread != NULL && need_wakeup)
134 __timer_thread_wakeup (thread);