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EventConfig::setMaxDispatchInterval — Prevents priority inversion
$max_interval
   
   , 
    int
     $max_callbacks
   
   , 
    int
     $min_priority
   
   )Prevents priority inversion by limiting how many low-priority event callbacks can be invoked before checking for more high-priority events.
Note:
Available since libevent 2.1.0-alpha .
max_interval
    
      An interval after which Libevent should stop running callbacks and check
      for more events, or
      0
      , if there should be no such interval.
     
max_callbacks
    
      A number of callbacks after which Libevent should stop running callbacks
      and check for more events, or
      -1
      , if there should be no such limit.
     
min_priority
    
      A priority below which
      max_interval
      and
      max_callbacks
      should not be enforced. If this is set to
      0
      , they are enforced for events of every priority; if it's set to
      1
      , they're enforced for events of priority
      1
      and above, and so on.
     
   Returns TRUE on success, otherwise FALSE.