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pthread: fix error code checks (thanks, Andreas!).

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Most pthread functions return 0 on success and non-zero on error, but those
errors might be positive or negative, so checking for return values in the
Unix style, where errors are less than zero, is a bug.

Fixes Bugzilla #4039.
This commit is contained in:
Ryan C. Gordon 2018-02-17 23:57:57 -05:00
parent 2ea4419a57
commit 75a58303a0
3 changed files with 5 additions and 5 deletions
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2
src/thread/pthread/SDL_syscond.c
View file

@ -42,7 +42,7 @@ SDL_CreateCond(void)
cond = (SDL_cond *) SDL_malloc(sizeof(SDL_cond));
if (cond) {
if (pthread_cond_init(&cond->cond, NULL) < 0) {
if (pthread_cond_init(&cond->cond, NULL) != 0) {
SDL_SetError("pthread_cond_init() failed");
SDL_free(cond);
cond = NULL;

4
src/thread/pthread/SDL_sysmutex.c
View file

@ -105,7 +105,7 @@ SDL_LockMutex(SDL_mutex * mutex)
}
}
#else
if (pthread_mutex_lock(&mutex->id) < 0) {
if (pthread_mutex_lock(&mutex->id) != 0) {
return SDL_SetError("pthread_mutex_lock() failed");
}
#endif
@ -181,7 +181,7 @@ SDL_UnlockMutex(SDL_mutex * mutex)
}
#else
if (pthread_mutex_unlock(&mutex->id) < 0) {
if (pthread_mutex_unlock(&mutex->id) != 0) {
return SDL_SetError("pthread_mutex_unlock() failed");
}
#endif /* FAKE_RECURSIVE_MUTEX */

4
src/thread/pthread/SDL_systhread.c
View file

@ -212,7 +212,7 @@ SDL_SYS_SetThreadPriority(SDL_ThreadPriority priority)
int policy;
pthread_t thread = pthread_self();
if (pthread_getschedparam(thread, &policy, &sched) < 0) {
if (pthread_getschedparam(thread, &policy, &sched) != 0) {
return SDL_SetError("pthread_getschedparam() failed");
}
if (priority == SDL_THREAD_PRIORITY_LOW) {
@ -224,7 +224,7 @@ SDL_SYS_SetThreadPriority(SDL_ThreadPriority priority)
int max_priority = sched_get_priority_max(policy);
sched.sched_priority = (min_priority + (max_priority - min_priority) / 2);
}
if (pthread_setschedparam(thread, policy, &sched) < 0) {
if (pthread_setschedparam(thread, policy, &sched) != 0) {
return SDL_SetError("pthread_setschedparam() failed");
}
return 0;