diff --git a/ftk/src/ftksys.h b/ftk/src/ftksys.h
index 6c8b546..176a884 100644
--- a/ftk/src/ftksys.h
+++ b/ftk/src/ftksys.h
@@ -293,7 +293,7 @@
 	Desc:
 	**********************************************************************/
 	#if defined( FLM_UNIX)
-	extern "C" FLMINT32 posix_atomic_add_32(
+	FLMINT32 posix_atomic_add_32(
 		volatile FLMINT32 *		piTarget,
 		FLMINT32						iDelta);
 	#endif
@@ -302,7 +302,7 @@
 	Desc:
 	**********************************************************************/
 	#if defined( FLM_UNIX)
-	extern "C" FLMINT32 posix_atomic_xchg_32(
+	FLMINT32 posix_atomic_xchg_32(
 		volatile FLMINT32 *		piTarget,
 		FLMINT32						iNewValue);
 	#endif
diff --git a/ftk/src/ftkunix.cpp b/ftk/src/ftkunix.cpp
index e789b67..92ff89b 100644
--- a/ftk/src/ftkunix.cpp
+++ b/ftk/src/ftkunix.cpp
@@ -69,6 +69,8 @@
 	static FLMUINT					gv_uiLinuxRevision = 0;
 #endif
 
+static pthread_mutex_t			gv_atomicMutex = PTHREAD_MUTEX_INITIALIZER;
+
 /******************************************************************************
 Desc:
 *******************************************************************************/
@@ -1543,6 +1545,40 @@ void FLMAPI f_yieldCPU( void)
 {
 }
 
+/**********************************************************************
+Desc:
+**********************************************************************/
+FLMINT32 posix_atomic_add_32(
+	volatile FLMINT32 *		piTarget,
+	FLMINT32						iDelta)
+{
+	FLMINT32		i32RetVal;
+	
+	pthread_mutex_lock( gv_atomicMutex);
+	(*piTarget) += iDelta;
+	i32RetVal = *piTarget;
+	pthread_mutex_unlock( gv_atomicMutex);
+	
+	return( i32RetVal);
+}
+
+/**********************************************************************
+Desc:
+**********************************************************************/
+FLMINT32 posix_atomic_xchg_32(
+	volatile FLMINT32 *		piTarget,
+	FLMINT32						iNewValue)
+{
+	FLMINT32		i32RetVal;
+	
+	pthread_mutex_lock( gv_atomicMutex);
+	i32RetVal = *piTarget;
+	*piTarget = iNewValue;
+	pthread_mutex_unlock( gv_atomicMutex);
+	
+	return( i32RetVal);
+}
+
 #endif // FLM_UNIX
 
 #if defined( FLM_WATCOM_NLM)