X-Git-Url: https://git.lttng.org/?p=urcu.git;a=blobdiff_plain;f=doc%2Fexamples%2Furcu-flavors%2Fmembarrier.c;h=21f4579972193497366eacb8d137c001bce1c3f4;hp=0c5be4c0aeae946dbd9c645273d318b8dfdf1231;hb=d7818a6fd0c57b576f3bacc67ddd62bc8a78fb05;hpb=9b4bf32b5757c99226eb78bea03f911536f2e9fc

diff --git a/doc/examples/urcu-flavors/membarrier.c b/doc/examples/urcu-flavors/membarrier.c
index 0c5be4c..21f4579 100644
--- a/doc/examples/urcu-flavors/membarrier.c
+++ b/doc/examples/urcu-flavors/membarrier.c
@@ -116,6 +116,15 @@ int main(int argc, char **argv)
 		call_rcu(&node->rcu_head, rcu_free_node);
 	}
 
+	/*
+	 * We can also wait for a quiescent state by calling
+	 * synchronize_rcu() rather than using call_rcu(). It is usually
+	 * a slower approach than call_rcu(), because the latter can
+	 * batch work. Moreover, call_rcu() can be called from a RCU
+	 * read-side critical section, but synchronize_rcu() should not.
+	 */
+	synchronize_rcu();
+
 	sleep(1);
 
 	/*