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LibPthread: Improve error handling for the semaphore functions

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This patch makes sure we're propagating errors to the caller.
This commit is contained in:
Gunnar Beutner 2021-04-14 22:51:37 +02:00 committed by Andreas Kling
parent 98403eccb0
commit 32794e00a1
Notes: sideshowbarker 2024-07-18 20:19:39 +09:00 
Author: https://github.com/gunnarbeutner
Commit: https://github.com/SerenityOS/serenity/commit/32794e00a16
Pull-request: https://github.com/SerenityOS/serenity/pull/6332
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/alimpfard
Reviewed-by: https://github.com/tomuta
1 changed files with 44 additions and 10 deletions
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54
Userland/Libraries/LibPthread/semaphore.cpp
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@ -36,8 +36,18 @@ int sem_close(sem_t*)
int sem_destroy(sem_t* sem)
{
pthread_mutex_destroy(&sem->mtx);
pthread_cond_destroy(&sem->cv);
auto rc = pthread_mutex_destroy(&sem->mtx);
if (rc != 0) {
errno = rc;
return -1;
}
rc = pthread_cond_destroy(&sem->cv);
if (rc != 0) {
errno = rc;
return -1;
}
return 0;
}
@ -58,11 +68,17 @@ int sem_init(sem_t* sem, int shared, unsigned int value)
return -1;
}
if (pthread_mutex_init(&sem->mtx, nullptr) != 0)
auto rc = pthread_mutex_init(&sem->mtx, nullptr);
if (rc != 0) {
errno = rc;
return -1;
}
if (pthread_cond_init(&sem->cv, nullptr) != 0)
rc = pthread_cond_init(&sem->cv, nullptr);
if (rc != 0) {
errno = rc;
return -1;
}
sem->value = value;
@ -85,17 +101,29 @@ int sem_post(sem_t* sem)
sem->value++;
pthread_cond_signal(&sem->cv);
auto rc = pthread_cond_signal(&sem->cv);
if (rc != 0) {
pthread_mutex_unlock(&sem->mtx);
errno = rc;
return -1;
}
pthread_mutex_unlock(&sem->mtx);
rc = pthread_mutex_unlock(&sem->mtx);
if (errno != 0) {
errno = rc;
return -1;
}
return 0;
}
int sem_trywait(sem_t* sem)
{
if (pthread_mutex_lock(&sem->mtx) != 0)
auto rc = pthread_mutex_lock(&sem->mtx);
if (rc != 0) {
errno = rc;
return -1;
}
if (sem->value == 0) {
pthread_mutex_unlock(&sem->mtx);
@ -110,17 +138,23 @@ int sem_trywait(sem_t* sem)
int sem_unlink(const char*)
{
return ENOSYS;
errno = ENOSYS;
return -1;
}
int sem_wait(sem_t* sem)
{
if (pthread_mutex_lock(&sem->mtx) != 0)
auto rc = pthread_mutex_lock(&sem->mtx);
if (errno != 0) {
errno = rc;
return -1;
}
while (sem->value == 0) {
if (pthread_cond_wait(&sem->cv, &sem->mtx) != 0) {
rc = pthread_cond_wait(&sem->cv, &sem->mtx);
if (rc != 0) {
pthread_mutex_unlock(&sem->mtx);
errno = rc;
return -1;
}
}