From: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Date: Thu, 14 Jan 2010 01:52:52 +0000 (-0500)
Subject: Update support for MEMBARRIER_QUERY
X-Git-Tag: v0.4.0~7
X-Git-Url: https://git.lttng.org/?p=urcu.git;a=commitdiff_plain;h=cf5271eed768bea133b1916eca1d1917920e3105

Update support for MEMBARRIER_QUERY

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---

diff --git a/urcu-static.h b/urcu-static.h
index 44bcd07..e1d0704 100644
--- a/urcu-static.h
+++ b/urcu-static.h
@@ -56,8 +56,9 @@ extern "C" {
 
 /* If the headers do not support SYS_membarrier, statically use RCU_MB */
 #ifdef SYS_membarrier
-# define MEMBARRIER_EXPEDITED            (1 << 0)
-# define MEMBARRIER_DELAYED              (1 << 1)
+# define MEMBARRIER_EXPEDITED		(1 << 0)
+# define MEMBARRIER_DELAYED		(1 << 1)
+# define MEMBARRIER_QUERY		(1 << 16)
 # define membarrier(...)		syscall(__NR_membarrier, __VA_ARGS__)
 #else
 # undef RCU_MEMBARRIER
diff --git a/urcu.c b/urcu.c
index b8e8b42..7b75d4c 100644
--- a/urcu.c
+++ b/urcu.c
@@ -392,7 +392,7 @@ void rcu_init(void)
 	if (init_done)
 		return;
 	init_done = 1;
-	if (!membarrier(MEMBARRIER_EXPEDITED))
+	if (!membarrier(MEMBARRIER_EXPEDITED | MEMBARRIER_QUERY))
 		has_sys_membarrier = 1;
 }
 #endif