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 .
 An interval after which Libevent should stop running callbacks and check for more events, or 0 , if there should be no such interval. 
 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. 
 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. 
 
          
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