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/*
* Copyright (c) 2013-2018 Richard Braun.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*
* Locking order : mutex -> sleep queue
*/
#include <assert.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <kern/condition.h>
#include <kern/condition_types.h>
#include <kern/mutex.h>
#include <kern/sleepq.h>
static int
condition_wait_common(struct condition *condition, struct mutex *mutex,
bool timed, uint64_t ticks)
{
struct sleepq *sleepq;
int error;
assert(mutex_locked(mutex));
sleepq = sleepq_lend(condition, true);
mutex_unlock(mutex);
if (timed) {
error = sleepq_timedwait(sleepq, "cond", ticks);
} else {
sleepq_wait(sleepq, "cond");
error = 0;
}
sleepq_return(sleepq);
mutex_lock(mutex);
return error;
}
void
condition_wait(struct condition *condition, struct mutex *mutex)
{
int error;
error = condition_wait_common(condition, mutex, false, 0);
assert(!error);
}
int
condition_timedwait(struct condition *condition,
struct mutex *mutex, uint64_t ticks)
{
return condition_wait_common(condition, mutex, true, ticks);
}
void
condition_signal(struct condition *condition)
{
struct sleepq *sleepq;
sleepq = sleepq_acquire(condition, true);
if (sleepq == NULL) {
return;
}
sleepq_signal(sleepq);
sleepq_release(sleepq);
}
void
condition_broadcast(struct condition *condition)
{
struct sleepq *sleepq;
sleepq = sleepq_acquire(condition, true);
if (sleepq == NULL) {
return;
}
sleepq_broadcast(sleepq);
sleepq_release(sleepq);
}
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