X-Git-Url: https://git.liburcu.org/?a=blobdiff_plain;f=doc%2Fexamples%2Furcu-flavors%2Fqsbr.c;h=661ecae481d483f1f45c49944e253503748c3cd7;hb=70469b43316ecc8d6053550504858ad8a8ef9b16;hp=75302f0d31cf035afe2036039210fc3cb90fdf71;hpb=7ff54418ffac313216eac70d7af1474a78c21706;p=urcu.git

diff --git a/doc/examples/urcu-flavors/qsbr.c b/doc/examples/urcu-flavors/qsbr.c
index 75302f0..661ecae 100644
--- a/doc/examples/urcu-flavors/qsbr.c
+++ b/doc/examples/urcu-flavors/qsbr.c
@@ -22,7 +22,7 @@
 #include <stdint.h>
 #include <inttypes.h>
 
-#include <urcu-qsbr.h>		/* QSBR RCU flavor */
+#include <urcu/urcu-qsbr.h>	/* QSBR RCU flavor */
 #include <urcu/rculist.h>	/* List example */
 #include <urcu/compiler.h>	/* For CAA_ARRAY_SIZE */
 
@@ -62,7 +62,7 @@ void rcu_free_node(struct rcu_head *rh)
 	free(node);
 }
 
-int main(int argc, char **argv)
+int main(void)
 {
 	uint64_t values[] = { 42, 36, 24, };
 	unsigned int i;
@@ -73,7 +73,7 @@ int main(int argc, char **argv)
 	 * Each thread need using RCU read-side need to be explicitly
 	 * registered.
 	 */
-	rcu_register_thread();
+	urcu_qsbr_register_thread();
 
 	/*
 	 * Adding nodes to the linked-list. Safe against concurrent
@@ -98,7 +98,13 @@ int main(int argc, char **argv)
 	 */
 	cds_list_for_each_entry_safe(node, n, &mylist, node) {
 		cds_list_del_rcu(&node->node);
-		call_rcu(&node->rcu_head, rcu_free_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.
+		 */
+		urcu_qsbr_call_rcu(&node->rcu_head, rcu_free_node);
 	}
 
 	/*
@@ -107,27 +113,37 @@ int main(int argc, char **argv)
 	 * every online registered RCU threads in the program
 	 * periodically.
 	 */
-	rcu_quiescent_state();
+	urcu_qsbr_quiescent_state();
 
 	/*
 	 * For QSBR flavor, when a thread needs to be in a quiescent
 	 * state for a long period of time, we use rcu_thread_offline()
 	 * and rcu_thread_online().
 	 */
-	rcu_thread_offline();
+	urcu_qsbr_thread_offline();
 
 	sleep(1);
 
-	rcu_thread_online();
+	urcu_qsbr_thread_online();
+
+	/*
+	 * 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() ensures the
+	 * caller thread is offline, thus acting as a quiescent state.
+	 */
+	urcu_qsbr_synchronize_rcu();
 
 	/*
 	 * Waiting for previously called call_rcu handlers to complete
 	 * before program exits, or in library destructors, is a good
 	 * practice.
 	 */
-	rcu_barrier();
+	urcu_qsbr_barrier();
 
 end:
-	rcu_unregister_thread();
+	urcu_qsbr_unregister_thread();
 	return ret;
 }