public   void    EventBufferEvent::setWatermark    (     int     $events      ,     int     $lowmark      ,     int     $highmark      )

EventBufferEvent::setWatermarkAdjusts read and/or write watermarks

events

Bitmask of Event::READ , Event::WRITE , or both.

lowmark

Minimum watermark value.

highmark

Maximum watermark value. 0 means "unlimited".