normal	2018-08-14 07:19:54 +0900 (Tue, 14 Aug 2018)

  New Revision: 64354

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=64354

  Log:
    thread_pthread (rb_timer_arm): ignore UBF_TIMER_POSIX state 2
    
    It looks like I forgot to account for a situation involving 3
    threads.
    
    [ruby-core:88360] [Misc #14937]

  Modified files:
    trunk/thread_pthread.c
Index: thread_pthread.c
===================================================================
--- thread_pthread.c	(revision 64353)
+++ thread_pthread.c	(revision 64354)
@@ -1386,7 +1386,13 @@ rb_timer_arm(rb_pid_t current) /* async https://github.com/ruby/ruby/blob/trunk/thread_pthread.c#L1386
 
           case 1: return; /* success */
           case 2:
-            rb_async_bug_errno("UBF_TIMER_POSIX state 2 unexpected", EINVAL);
+            /*
+             * it is possible to have another thread disarm, and
+             * a third thread arm finish re-arming before we get
+             * here, so we wasted a syscall with timer_settime but
+             * probably unavoidable in a signal handler.
+             */
+            return;
           default:
             rb_async_bug_errno("UBF_TIMER_POSIX unknown state", ERANGE);
         }

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