(PECL event >= 1.2.6-beta)
EventBufferEvent::setWatermark — Adjusts read and/or write watermarks
Adjusts the read watermarks, the write watermarks, or both, of a single buffer event.
A buffer event watermark is an edge, a value specifying number of bytes to be read or written before callback is invoked. By default every read/write event triggers a callback invokation. See » Fast portable non-blocking network programming with Libevent: Callbacks and watermarks
events
Bitmask of
Event::READ,
Event::WRITE,
or both.
lowmark
Minimum watermark value.
highmark
Maximum watermark value.
0
means "unlimited".
没有返回值。