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(This is the documentation for SDL3, which is under heavy development and the API is changing! SDL2 is the current stable version!)


Try to lock a read/write lock for writing without blocking.


int SDL_TryLockRWLockForWriting(SDL_RWLock *rwlock) SDL_TRY_ACQUIRE(0, rwlock);

Function Parameters

rwlock the rwlock to try to lock

Return Value

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


This works just like SDL_LockRWLockForWriting(), but if the rwlock is not available, this function returns SDL_RWLOCK_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.

It is illegal for the owning thread to lock an already-locked rwlock for writing (read-only may be locked recursively, writing can not). Doing so results in undefined behavior.

It is illegal to request a write lock from a thread that already holds a read-only lock. Doing so results in undefined behavior. Unlock the read-only lock before requesting a write lock.


This function is available since SDL 3.0.0.


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