normal	2018-06-17 12:27:45 +0900 (Sun, 17 Jun 2018)

  New Revision: 63683

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=63683

  Log:
    thread_pthread.c: microptimize vm->gvl.waiting checks
    
    "gvl.waiting" is volatile, so the compiler won't perform
    these optimizations for us.

  Modified files:
    trunk/thread_pthread.c
Index: thread_pthread.c
===================================================================
--- thread_pthread.c	(revision 63682)
+++ thread_pthread.c	(revision 63683)
@@ -73,8 +73,7 @@ gvl_acquire_common(rb_vm_t *vm) https://github.com/ruby/ruby/blob/trunk/thread_pthread.c#L73
 {
     if (vm->gvl.acquired) {
 
-	vm->gvl.waiting++;
-	if (vm->gvl.waiting == 1) {
+	if (!vm->gvl.waiting++) {
 	    /*
 	     * Wake up timer thread iff timer thread is slept.
 	     * When timer thread is polling mode, we don't want to
@@ -87,7 +86,7 @@ gvl_acquire_common(rb_vm_t *vm) https://github.com/ruby/ruby/blob/trunk/thread_pthread.c#L86
             rb_native_cond_wait(&vm->gvl.cond, &vm->gvl.lock);
 	}
 
-	vm->gvl.waiting--;
+	--vm->gvl.waiting;
 
 	if (vm->gvl.need_yield) {
 	    vm->gvl.need_yield = 0;

--
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