[GHC] #11965: USE_PTHREAD_FOR_ITIMER causes unnecessary wake-ups

[GHC]

#11965: USE_PTHREAD_FOR_ITIMER causes unnecessary wake-ups
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:
            Type:  bug               |               Status:  patch
        Priority:  high              |            Milestone:
       Component:  Runtime System    |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #1623             |  Differential Rev(s):  Phab:D2131
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by Ben Gamari <ben@…>):

 In [changeset:"999c464da36e925bd4ffea34c94d3a7b3ab0135c/ghc" 999c464/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="999c464da36e925bd4ffea34c94d3a7b3ab0135c"
 rts/itimer/pthread: Stop timer when ticker is stopped

 This reworks the pthread-based itimer implementation to disarm the timer
 when events aren't needed. Thanks to hsyl20 for the nice design.

 Test Plan: Validate

 Reviewers: hsyl20, simonmar, austin

 Reviewed By: simonmar

 Subscribers: thomie

 Differential Revision: https://phabricator.haskell.org/D2131

 GHC Trac Issues: #1623, #11965
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11965#comment:2>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler