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glibc/sysdeps/pthread/timer_settime.c
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/* Copyright (C) 2000-2014 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by Kaz Kylheku <kaz@ashi.footprints.net>. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public License as | |
published by the Free Software Foundation; either version 2.1 of the | |
License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; see the file COPYING.LIB. If | |
not, see <http://www.gnu.org/licenses/>. */ | |
#include <errno.h> | |
#include <pthread.h> | |
#include <time.h> | |
#include "posix-timer.h" | |
/* Set timer TIMERID to VALUE, returning old value in OVLAUE. */ | |
int | |
timer_settime (timerid, flags, value, ovalue) | |
timer_t timerid; | |
int flags; | |
const struct itimerspec *value; | |
struct itimerspec *ovalue; | |
{ | |
struct timer_node *timer; | |
struct thread_node *thread = NULL; | |
struct timespec now; | |
int have_now = 0, need_wakeup = 0; | |
int retval = -1; | |
timer = timer_id2ptr (timerid); | |
if (timer == NULL) | |
{ | |
__set_errno (EINVAL); | |
goto bail; | |
} | |
if (value->it_interval.tv_nsec < 0 | |
|| value->it_interval.tv_nsec >= 1000000000 | |
|| value->it_value.tv_nsec < 0 | |
|| value->it_value.tv_nsec >= 1000000000) | |
{ | |
__set_errno (EINVAL); | |
goto bail; | |
} | |
/* Will need to know current time since this is a relative timer; | |
might as well make the system call outside of the lock now! */ | |
if ((flags & TIMER_ABSTIME) == 0) | |
{ | |
clock_gettime (timer->clock, &now); | |
have_now = 1; | |
} | |
pthread_mutex_lock (&__timer_mutex); | |
timer_addref (timer); | |
/* One final check of timer validity; this one is possible only | |
until we have the mutex, because it accesses the inuse flag. */ | |
if (! timer_valid(timer)) | |
{ | |
__set_errno (EINVAL); | |
goto unlock_bail; | |
} | |
if (ovalue != NULL) | |
{ | |
ovalue->it_interval = timer->value.it_interval; | |
if (timer->armed) | |
{ | |
if (! have_now) | |
{ | |
pthread_mutex_unlock (&__timer_mutex); | |
clock_gettime (timer->clock, &now); | |
have_now = 1; | |
pthread_mutex_lock (&__timer_mutex); | |
timer_addref (timer); | |
} | |
timespec_sub (&ovalue->it_value, &timer->expirytime, &now); | |
} | |
else | |
{ | |
ovalue->it_value.tv_sec = 0; | |
ovalue->it_value.tv_nsec = 0; | |
} | |
} | |
timer->value = *value; | |
list_unlink_ip (&timer->links); | |
timer->armed = 0; | |
thread = timer->thread; | |
/* A value of { 0, 0 } causes the timer to be stopped. */ | |
if (value->it_value.tv_sec != 0 | |
|| __builtin_expect (value->it_value.tv_nsec != 0, 1)) | |
{ | |
if ((flags & TIMER_ABSTIME) != 0) | |
/* The user specified the expiration time. */ | |
timer->expirytime = value->it_value; | |
else | |
timespec_add (&timer->expirytime, &now, &value->it_value); | |
/* Only need to wake up the thread if timer is inserted | |
at the head of the queue. */ | |
if (thread != NULL) | |
need_wakeup = __timer_thread_queue_timer (thread, timer); | |
timer->armed = 1; | |
} | |
retval = 0; | |
unlock_bail: | |
timer_delref (timer); | |
pthread_mutex_unlock (&__timer_mutex); | |
bail: | |
if (thread != NULL && need_wakeup) | |
__timer_thread_wakeup (thread); | |
return retval; | |
} |