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glibc/sysdeps/pthread/timer_create.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 <signal.h> | |
#include <pthread.h> | |
#include <time.h> | |
#include <unistd.h> | |
#include "posix-timer.h" | |
/* Create new per-process timer using CLOCK. */ | |
int | |
timer_create (clock_id, evp, timerid) | |
clockid_t clock_id; | |
struct sigevent *evp; | |
timer_t *timerid; | |
{ | |
int retval = -1; | |
struct timer_node *newtimer = NULL; | |
struct thread_node *thread = NULL; | |
if (0 | |
#if defined _POSIX_CPUTIME && _POSIX_CPUTIME >= 0 | |
|| clock_id == CLOCK_PROCESS_CPUTIME_ID | |
#endif | |
#if defined _POSIX_THREAD_CPUTIME && _POSIX_THREAD_CPUTIME >= 0 | |
|| clock_id == CLOCK_THREAD_CPUTIME_ID | |
#endif | |
) | |
{ | |
/* We don't allow timers for CPU clocks. At least not in the | |
moment. */ | |
__set_errno (ENOTSUP); | |
return -1; | |
} | |
if (clock_id != CLOCK_REALTIME) | |
{ | |
__set_errno (EINVAL); | |
return -1; | |
} | |
pthread_once (&__timer_init_once_control, __timer_init_once); | |
if (__timer_init_failed) | |
{ | |
__set_errno (ENOMEM); | |
return -1; | |
} | |
pthread_mutex_lock (&__timer_mutex); | |
newtimer = __timer_alloc (); | |
if (__glibc_unlikely (newtimer == NULL)) | |
{ | |
__set_errno (EAGAIN); | |
goto unlock_bail; | |
} | |
if (evp != NULL) | |
newtimer->event = *evp; | |
else | |
{ | |
newtimer->event.sigev_notify = SIGEV_SIGNAL; | |
newtimer->event.sigev_signo = SIGALRM; | |
newtimer->event.sigev_value.sival_ptr = timer_ptr2id (newtimer); | |
newtimer->event.sigev_notify_function = 0; | |
} | |
newtimer->event.sigev_notify_attributes = &newtimer->attr; | |
newtimer->creator_pid = getpid (); | |
switch (__builtin_expect (newtimer->event.sigev_notify, SIGEV_SIGNAL)) | |
{ | |
case SIGEV_NONE: | |
case SIGEV_SIGNAL: | |
/* We have a global thread for delivering timed signals. | |
If it is not running, try to start it up. */ | |
thread = &__timer_signal_thread_rclk; | |
if (! thread->exists) | |
{ | |
if (__builtin_expect (__timer_thread_start (thread), | |
1) < 0) | |
{ | |
__set_errno (EAGAIN); | |
goto unlock_bail; | |
} | |
} | |
break; | |
case SIGEV_THREAD: | |
/* Copy over thread attributes or set up default ones. */ | |
if (evp->sigev_notify_attributes) | |
newtimer->attr = *(pthread_attr_t *) evp->sigev_notify_attributes; | |
else | |
pthread_attr_init (&newtimer->attr); | |
/* Ensure thread attributes call for deatched thread. */ | |
pthread_attr_setdetachstate (&newtimer->attr, PTHREAD_CREATE_DETACHED); | |
/* Try to find existing thread having the right attributes. */ | |
thread = __timer_thread_find_matching (&newtimer->attr, clock_id); | |
/* If no existing thread has these attributes, try to allocate one. */ | |
if (thread == NULL) | |
thread = __timer_thread_alloc (&newtimer->attr, clock_id); | |
/* Out of luck; no threads are available. */ | |
if (__glibc_unlikely (thread == NULL)) | |
{ | |
__set_errno (EAGAIN); | |
goto unlock_bail; | |
} | |
/* If the thread is not running already, try to start it. */ | |
if (! thread->exists | |
&& __builtin_expect (! __timer_thread_start (thread), 0)) | |
{ | |
__set_errno (EAGAIN); | |
goto unlock_bail; | |
} | |
break; | |
default: | |
__set_errno (EINVAL); | |
goto unlock_bail; | |
} | |
newtimer->clock = clock_id; | |
newtimer->abstime = 0; | |
newtimer->armed = 0; | |
newtimer->thread = thread; | |
*timerid = timer_ptr2id (newtimer); | |
retval = 0; | |
if (__builtin_expect (retval, 0) == -1) | |
{ | |
unlock_bail: | |
if (thread != NULL) | |
__timer_thread_dealloc (thread); | |
if (newtimer != NULL) | |
{ | |
timer_delref (newtimer); | |
__timer_dealloc (newtimer); | |
} | |
} | |
pthread_mutex_unlock (&__timer_mutex); | |
return retval; | |
} |