From e9e4ea981ed45edd35f177992ca2002a82283c8f Mon Sep 17 00:00:00 2001
From: tarui <tarui@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 19 Dec 2012 08:54:57 +0000
Subject: 	* vm_trace.c (rb_threadptr_exec_event_hooks): get rid of race 
   condition. [Bug #7589] [ruby-dev:46763]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38464 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 vm_trace.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'vm_trace.c')

diff --git a/vm_trace.c b/vm_trace.c
index 861ee0511a..9186983e28 100644
--- a/vm_trace.c
+++ b/vm_trace.c
@@ -291,7 +291,7 @@ rb_threadptr_exec_event_hooks(rb_trace_arg_t *targ)
 	int state = 0;
 	th->state = 0;
 
-	th->vm->trace_running = 1;
+	th->vm->trace_running++;
 	th->trace_running = 1;
 	{
 	    rb_hook_list_t *list;
@@ -313,7 +313,7 @@ rb_threadptr_exec_event_hooks(rb_trace_arg_t *targ)
 	}
       terminate:
 	th->trace_running = 0;
-	th->vm->trace_running = vm_tracing;
+	th->vm->trace_running--;
 
 	if (state) {
 	    TH_JUMP_TAG(th, state);
-- 
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