Try to lock a read/write lock for reading without blocking.
int SDL_TryLockRWLockForReading(SDL_RWLock *rwlock) SDL_TRY_ACQUIRE_SHARED(0, rwlock);
|rwlock||the rwlock to try to lock|
SDL_RWLOCK_TIMEDOUT, or -1 on error; call SDL_GetError() for more information.
This works just like SDL_LockRWLockForReading(), but if the rwlock is not available, then this function returns
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 is available since SDL 3.0.0.