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SDL Wiki

Draft

THIS PAGE IS A WORK IN PROGRESS ... Please make edits to this page to improve it!

SDL_TryLockMutex

Try to lock a mutex without blocking.

Syntax

int SDL_TryLockMutex(SDL_mutex * 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.

Remarks

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

Code Examples

int status;
SDL_mutex *mutex;

mutex = SDL_CreateMutex();
if (!mutex) {
  fprintf(stderr, "Couldn't create mutex\n");
  return;
}

status = SDL_TryLockMutex(mutex);

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

SDL_DestroyMutex(mutex);
SDL_CreateMutex
SDL_DestroyMutex
SDL_LockMutex
SDL_UnlockMutex

CategoryAPI, CategoryMutex, CategoryDraft


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