streamWrapper::stream_lock

This method is called in response to flock(), when file_put_contents() (when flags contains LOCK_EX), stream_set_blocking() and when closing the stream (LOCK_UN).

operation is one of the following:

• LOCK_SH to acquire a shared lock (reader).
• LOCK_EX to acquire an exclusive lock (writer).
• LOCK_UN to release a lock (shared or exclusive).
• LOCK_NB if you don't want flock() to block while locking. (not supported on Windows)

Returns TRUE on success or FALSE on failure.

Emits E_WARNING if call to this method fails (i.e. not implemented).

stream_set_blocking() -

flock() -