(PECL sync >= 1.0.0) Waits for an exclusive lock

(PECL sync >= 1.0.0) Constructs a new SyncMutex object

(PECL sync >= 1.0.0) Releases a read lock

(PECL sync >= 1.0.0) Releases a write lock

(PECL sync >= 1.0.0) Unlocks the mutex public