diff options
Diffstat (limited to 'rt/timer_settime.c')
| -rw-r--r-- | rt/timer_settime.c | 120 |
1 files changed, 111 insertions, 9 deletions
diff --git a/rt/timer_settime.c b/rt/timer_settime.c index cde0e742fc..c05adf166f 100644 --- a/rt/timer_settime.c +++ b/rt/timer_settime.c @@ -1,10 +1,11 @@ -/* Copyright (C) 1999-2021 Free Software Foundation, Inc. +/* Copyright (C) 2000-2021 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. + 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 @@ -12,18 +13,119 @@ 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; if not, see - <https://www.gnu.org/licenses/>. */ + License along with the GNU C Library; see the file COPYING.LIB. If + not, see <https://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) { - __set_errno (ENOSYS); - return -1; + 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 (! valid_nanoseconds (value->it_interval.tv_nsec) + || ! valid_nanoseconds (value->it_value.tv_nsec)) + { + __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; } -stub_warning (timer_settime) |