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Improvements to pthread condition variable code

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This commit is contained in:
Ali Mashtizadeh 2015-02-03 14:26:51 -08:00
parent f0d5e791ba
commit f067ec6252
1 changed files with 31 additions and 12 deletions
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43
lib/libc/posix/pthread.c
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@ -345,18 +345,22 @@ pthread_cond_destroy(pthread_cond_t *cond)
int
pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
{
int status;
struct pthread_cond *cnd;
uint64_t level;
if (*cond == NULL) {
int status = pthread_cond_init(cond, NULL);
status = pthread_cond_init(cond, NULL);
if (status != 0)
return status;
}
cnd = *cond;
if (mutex)
pthread_mutex_unlock(mutex);
if (mutex) {
status = pthread_mutex_unlock(mutex);
if (status != 0)
return status;
}
CoreMutex_Lock(&cnd->mtx);
level = cnd->enter;
@ -367,8 +371,11 @@ pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
OSThreadSleep(0);
}
if (mutex)
pthread_mutex_lock(mutex);
if (mutex) {
status = pthread_mutex_lock(mutex);
if (status != 0)
return status;
}
return 0;
}
@ -377,18 +384,24 @@ int
pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex,
const struct timespec *abstime)
{
int status = 0;
int rstatus = 0;
struct pthread_cond *cnd;
uint64_t level;
uint64_t endtime = abstime->tv_sec * 1000000000 + abstime->tv_nsec;
if (*cond == NULL) {
int status = pthread_cond_init(cond, NULL);
status = pthread_cond_init(cond, NULL);
if (status != 0)
return status;
}
cnd = *cond;
if (mutex)
pthread_mutex_unlock(mutex);
if (mutex) {
status = pthread_mutex_unlock(mutex);
if (status != 0)
return status;
}
CoreMutex_Lock(&cnd->mtx);
level = cnd->enter;
@ -398,13 +411,19 @@ pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex,
while (level >= cnd->exit) {
OSThreadSleep(0);
// XXX: check time
if (endtime < OSTime()) {
rstatus = ETIMEDOUT;
break;
}
}
if (mutex)
pthread_mutex_lock(mutex);
if (mutex) {
status = pthread_mutex_lock(mutex);
if (status != 0)
return status;
}
return 0;
return rstatus;
}