# SDL_TryLockRWLockForReading Try to lock a read/write lock _for reading_ without blocking. ## Header File Defined in [<SDL3/SDL_mutex.h>](https://github.com/libsdl-org/SDL/blob/main/include/SDL3/SDL_mutex.h) ## Syntax ```c bool SDL_TryLockRWLockForReading(SDL_RWLock *rwlock); ``` ## Function Parameters | | | | | -------------------------- | ---------- | -------------------------- | | [SDL_RWLock](SDL_RWLock) * | **rwlock** | the rwlock to try to lock. | ## Return Value (bool) Returns true on success, false if the lock would block. ## Remarks This works just like [SDL_LockRWLockForReading](SDL_LockRWLockForReading)(), but if the rwlock is not available, then this function returns false immediately. This technique is useful if you need access to a resource but don't want to wait for it, and will return to it to try again later. Trying to lock for read-only access can succeed if other threads are holding read-only locks, as this won't prevent access. This function returns true if passed a NULL rwlock. ## Version This function is available since SDL 3.2.0. ## See Also - [SDL_LockRWLockForReading](SDL_LockRWLockForReading) - [SDL_TryLockRWLockForWriting](SDL_TryLockRWLockForWriting) - [SDL_UnlockRWLock](SDL_UnlockRWLock) ---- [CategoryAPI](CategoryAPI), [CategoryAPIFunction](CategoryAPIFunction), [CategoryMutex](CategoryMutex)