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

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.

3 files changed, 5 insertions, 5 deletions

diff --git a/src/thread/pthread/SDL_syscond.c b/src/thread/pthread/SDL_syscond.c
index bb0c31824b..d23578038d 100644
--- a/src/thread/pthread/SDL_syscond.c
+++ b/src/thread/pthread/SDL_syscond.c
@@ -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;
diff --git a/src/thread/pthread/SDL_sysmutex.c b/src/thread/pthread/SDL_sysmutex.c
index 071a56c97d..e7b5b5cece 100644
--- a/src/thread/pthread/SDL_sysmutex.c
+++ b/src/thread/pthread/SDL_sysmutex.c
@@ -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 */
diff --git a/src/thread/pthread/SDL_systhread.c b/src/thread/pthread/SDL_systhread.c
index 5539d75818..035484085c 100644
--- a/src/thread/pthread/SDL_systhread.c
+++ b/src/thread/pthread/SDL_systhread.c
@@ -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;