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

(PECL sync >= 1.0.0) Unlocks the mutex public

(PECL sync >= 1.0.0) Releases a read lock

(PECL sync >= 1.0.0) Releases a write lock

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