(PECL sync >= 1.0.0)
A cross-platform, native implementation of named and unnamed reader-writer objects.
A reader-writer object allows many readers or one writer to access a resource. This is an efficient solution for managing resources where access will primarily be read-only but exclusive write access is occasionally necessary.
public __construct ([ string $name [, bool $autounlock = true ]] )
public readlock ([ int $wait = -1 ] ) : bool
public readunlock ( ) : bool
public writelock ([ int $wait = -1 ] ) : bool
public writeunlock ( ) : bool}
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