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glibc/sysdeps/pthread/timer_gettime.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" | |
/* Get current value of timer TIMERID and store it in VLAUE. */ | |
int | |
timer_gettime (timerid, value) | |
timer_t timerid; | |
struct itimerspec *value; | |
{ | |
struct timer_node *timer; | |
struct timespec now, expiry; | |
int retval = -1, armed = 0, valid; | |
clock_t clock = 0; | |
pthread_mutex_lock (&__timer_mutex); | |
timer = timer_id2ptr (timerid); | |
valid = timer_valid (timer); | |
if (valid) { | |
armed = timer->armed; | |
expiry = timer->expirytime; | |
clock = timer->clock; | |
value->it_interval = timer->value.it_interval; | |
} | |
pthread_mutex_unlock (&__timer_mutex); | |
if (valid) | |
{ | |
if (armed) | |
{ | |
clock_gettime (clock, &now); | |
if (timespec_compare (&now, &expiry) < 0) | |
timespec_sub (&value->it_value, &expiry, &now); | |
else | |
{ | |
value->it_value.tv_sec = 0; | |
value->it_value.tv_nsec = 0; | |
} | |
} | |
else | |
{ | |
value->it_value.tv_sec = 0; | |
value->it_value.tv_nsec = 0; | |
} | |
retval = 0; | |
} | |
else | |
__set_errno (EINVAL); | |
return retval; | |
} |