SDL_mutexP -- Lock a mutex
function SDL_mutexP( mutex : PSDL_mutex ) : Integer;
Locks the mutex, which was previously
created with SDL_CreateMutex
. If the mutex is already locked then SDL_mutexP
will not return until it is unlocked. Returns
0 on success, or
-1 on an error.
SDL also defines a procedure SDL_LockMutex that make
the call to SDL_mutexP(m).