| /* Copyright (C) 2000-2018 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 (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 = 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; |
| } |