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Try to lock a mutex without blocking.


int SDL_TryLockMutex(SDL_Mutex *mutex) SDL_TRY_ACQUIRE(0, mutex);

Function Parameters

mutex the mutex to try to lock

Return Value

Returns 0, SDL_MUTEX_TIMEDOUT, or -1 on error; call SDL_GetError() for more information.


This works just like SDL_LockMutex(), but if the mutex is not available, this function returns SDL_MUTEX_TIMEDOUT immediately.

This technique is useful if you need exclusive access to a resource but don't want to wait for it, and will return to it to try again later.


This function is available since SDL 3.0.0.

Code Examples

int status;
SDL_mutex *mutex;

mutex = SDL_CreateMutex();
if (!mutex) {
  SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create mutex\n");

status = SDL_TryLockMutex(mutex);

if (status == 0) {
  SDL_Log("Locked mutex\n");
} else if (status == SDL_MUTEX_TIMEDOUT) {
  /* Mutex not available for locking right now */
} else {
  SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't lock mutex\n");


CategoryAPI, CategoryMutex, CategoryDraft

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