From a9cc1beb42776b7e6ac01792e070b4d6703aef39 Mon Sep 17 00:00:00 2001
From: Sebastian Huber <sebastian.huber@embedded-brains.de>
Date: Fri, 19 Jul 2013 17:18:42 +0200
Subject: posix: Protect alarm()

Use thread dispatch disable/enable to ensure thread level mutual
exlusion.
---
 cpukit/posix/src/alarm.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/cpukit/posix/src/alarm.c b/cpukit/posix/src/alarm.c
index c671b9e161..be3a334f37 100644
--- a/cpukit/posix/src/alarm.c
+++ b/cpukit/posix/src/alarm.c
@@ -57,6 +57,8 @@ unsigned int alarm(
 
   the_timer = &_POSIX_signals_Alarm_timer;
 
+  _Thread_Disable_dispatch();
+
   state = _Watchdog_Remove( the_timer );
   if ( (state == WATCHDOG_ACTIVE) || (state == WATCHDOG_REMOVE_IT) ) {
     /*
@@ -72,5 +74,7 @@ unsigned int alarm(
   if ( seconds )
     _Watchdog_Insert_seconds( the_timer, seconds );
 
+  _Thread_Enable_dispatch();
+
   return remaining;
 }
-- 
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