X-Git-Url: https://git.liburcu.org/?a=blobdiff_plain;f=doc%2Fexamples%2Furcu-flavors%2Fmb.c;h=62ad54bb7ff00309f7de7572116de1222bd8b7ee;hb=2fec8f05f010408e989356e6f9d8c1e191ba4dfa;hp=24daaef75c5735580457476408a1e3424478b3a4;hpb=944504819e236e0d1b59599c4dfbde44a7ced226;p=urcu.git

diff --git a/doc/examples/urcu-flavors/mb.c b/doc/examples/urcu-flavors/mb.c
index 24daaef..62ad54b 100644
--- a/doc/examples/urcu-flavors/mb.c
+++ b/doc/examples/urcu-flavors/mb.c
@@ -108,9 +108,24 @@ int main(int argc, char **argv)
 	 */
 	cds_list_for_each_entry_safe(node, n, &mylist, node) {
 		cds_list_del_rcu(&node->node);
+		/*
+		 * call_rcu() will ensure that the handler
+		 * "rcu_free_node" is executed after a grace period.
+		 * call_rcu() can be called from RCU read-side critical
+		 * sections.
+		 */
 		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);
 
 	/*