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#include "conf.h"
#include "log.h"
#include "thread.h"
#include <errno.h>
#include <pthread.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
RCSID("$Id: thread.c,v 1.6 2000/03/21 19:18:24 shmit Exp $");
int
thread_new(thread_t *thread, void *(*thread_func)(void *), void *arg)
{
int rc;
thread->thread_func = thread_func;
rc = pthread_create(&thread->id, NULL, thread_func, arg);
if (rc != 0) {
log_err("Couldn't create thread: %s.\n", strerror(rc));
return -1;
}
return 0;
}
void
thread_kill(thread_t *thread)
{
}
int
thread_reload(thread_t *thread)
{
return 0;
}
int
mutex_new(mutex_t *lock)
{
return pthread_mutex_init(lock, NULL);
}
int
mutex_delete(mutex_t *lock)
{
return pthread_mutex_destroy(lock);
}
int
mutex_lock(mutex_t *lock)
{
return pthread_mutex_lock(lock);
}
int
mutex_unlock(mutex_t *lock)
{
return pthread_mutex_unlock(lock);
}
int
rw_mutex_new(rw_mutex_t *lock)
{
int rc;
rc = mutex_new(&lock->lock);
if (rc)
return rc;
rc = pthread_cond_init(&lock->read_sig, NULL);
if (rc) {
mutex_delete(&lock->lock);
return rc;
}
rc = pthread_cond_init(&lock->write_sig, NULL);
if (rc) {
mutex_delete(&lock->lock);
pthread_cond_destroy(&lock->read_sig);
return rc;
}
lock->state = 0;
lock->blocked_writers = 0;
return 0;
}
int
rw_mutex_read_lock(rw_mutex_t *lock)
{
int rc;
if (lock == NULL)
return EINVAL;
rc = mutex_lock(&lock->lock);
if (rc)
return rc;
/* Make sure the writers go before the readers. */
while (lock->blocked_writers || lock->state < 0) {
rc = pthread_cond_wait(&lock->read_sig, &lock->lock);
if (rc) {
mutex_unlock(&lock->lock);
return rc;
}
}
lock->state++;
mutex_unlock(&lock->lock);
return rc;
}
int
rw_mutex_write_lock(rw_mutex_t *lock)
{
int rc;
if (lock == NULL)
return EINVAL;
rc = mutex_lock(&lock->lock);
if (rc)
return rc;
/* Wait for no readers on the lock. */
while (lock->state != 0) {
lock->blocked_writers++;
rc = pthread_cond_wait(&lock->write_sig, &lock->lock);
lock->blocked_writers--;
if (rc) {
mutex_unlock(&lock->lock);
return rc;
}
}
lock->state = -1;
mutex_unlock(&lock->lock);
return rc;
}
int
rw_mutex_unlock(rw_mutex_t *lock)
{
int rc;
if (lock == NULL)
return EINVAL;
rc = mutex_lock(&lock->lock);
if (rc)
return rc;
if (lock->state > 0) {
/* We have an open read lock. */
if (--lock->state == 0 && lock->blocked_writers)
rc = pthread_cond_signal(&lock->write_sig);
} else if (lock->state < 0) {
/* We have an open writer lock. */
lock->state = 0;
if (lock->blocked_writers)
rc = pthread_cond_signal(&lock->write_sig);
else
rc = pthread_cond_broadcast(&lock->read_sig);
} else
rc = EINVAL;
mutex_unlock(&lock->lock);
return rc;
}
int
cond_new(cond_t *cond)
{
int rc;
if (cond == NULL)
return EINVAL;
rc = pthread_cond_init(&cond->id, NULL);
if (rc)
return rc;
rc = mutex_new(&cond->lock);
if (rc)
pthread_cond_destroy(&cond->id);
return rc;
}
int
cond_signal(cond_t *cond)
{
return pthread_cond_signal(&cond->id);
}
int
cond_wait(cond_t *cond)
{
return pthread_cond_wait(&cond->id, &cond->lock);
}
int
cond_timedwait(cond_t *cond, const struct timespec *abstime)
{
return pthread_cond_timedwait(&cond->id, &cond->lock, abstime);
}
int
cond_destroy(cond_t *cond)
{
return pthread_cond_destroy(&cond->id);
}
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