(PECL sync >= 1.0.0)
SyncReaderWriter::writelock — Waits for an exclusive write lock
Obtains an exclusive write lock on a SyncReaderWriter object.
The number of milliseconds to wait for a lock. A value of -1 is infinite.
A boolean of TRUE if the lock was obtained, FALSE otherwise.
Example #1 SyncReaderWriter::writelock() example
$readwrite = new SyncReaderWriter("FileCacheLock");
/* ... */