X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=urcu-qsbr.c;h=1dc99792d7a49f2f6f3614693e34cde239312bfb;hb=158cf657906dce346cb7197b1e9ce7f12076f5e8;hp=5e4348449ca9183b61bf1cbc6a041a549f784c2b;hpb=01dbfa62037e08aa2d08ab0e721267ccdd99b947;p=userspace-rcu.git

diff --git a/urcu-qsbr.c b/urcu-qsbr.c
index 5e43484..1dc9979 100644
--- a/urcu-qsbr.c
+++ b/urcu-qsbr.c
@@ -218,8 +218,11 @@ void synchronize_rcu(void)
 	 * our own quiescent state. This allows using synchronize_rcu()
 	 * in threads registered as readers.
 	 */
-	if (was_online)
+	if (was_online) {
 		CMM_STORE_SHARED(rcu_reader.ctr, 0);
+		cmm_smp_mb();	/* write rcu_reader.ctr before read futex */
+		wake_up_gp();
+	}
 
 	mutex_lock(&rcu_gp_lock);
 
@@ -277,8 +280,11 @@ void synchronize_rcu(void)
 	 * in threads registered as readers.
 	 */
 	cmm_smp_mb();
-	if (was_online)
+	if (was_online) {
 		CMM_STORE_SHARED(rcu_reader.ctr, 0);
+		cmm_smp_mb();	/* write rcu_reader.ctr before read futex */
+		wake_up_gp();
+	}
 
 	mutex_lock(&rcu_gp_lock);
 	if (cds_list_empty(&registry))