MapleMutexLock locks a mutex.  Only one thread can have a mutex locked at any one time.  If another thread is holding the lock, the current thread will block until it can obtain the lock.

To release the lock on a mutex, use the MapleMutexUnlock function.

A mutex can be created in external call using the MapleMutexCreate function.

The mutex identifier used by MapleMutexLock is compatible with the functions in the Threads[Mutex] package.  Thus mutexes created by Threads[Mutex][Create] can be passed into external call, and used by MapleMutexLock and MapleMutexUnlock.