| /* 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 <pthread.h> |
| #include <time.h> |
| |
| #include "posix-timer.h" |
| |
| |
| /* Set timer TIMERID to VALUE, returning old value in OVLAUE. */ |
| int |
| timer_settime (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; |
| } |