normal	2018-11-10 08:24:14 +0900 (Sat, 10 Nov 2018)

  New Revision: 65648

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=65648

  Log:
    thread_pthread.c (rb_sigwait_sleep): add note about spurious wakeup
    
    I already forgot why we needed to jump through such hoops :x
    [ruby-core:88102]

  Modified files:
    trunk/thread_pthread.c
Index: thread_pthread.c
===================================================================
--- thread_pthread.c	(revision 65647)
+++ thread_pthread.c	(revision 65648)
@@ -1981,6 +1981,9 @@ rb_sigwait_sleep(rb_thread_t *th, int si https://github.com/ruby/ruby/blob/trunk/thread_pthread.c#L1981
          * tricky: this needs to return on spurious wakeup (no auto-retry).
          * But we also need to distinguish between periodic quantum
          * wakeups, so we care about the result of consume_communication_pipe
+         *
+         * We want to avoid spurious wakeup for Mutex#sleep compatibility
+         * [ruby-core:88102]
          */
         for (;;) {
             const rb_hrtime_t *sto = sigwait_timeout(th, sigwait_fd, &to, &n);

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