X-Git-Url: http://git.liburcu.org/?p=urcu.git;a=blobdiff_plain;f=urcu-qsbr.c;h=d1f5d91846af8f8098eacab85a588d945ab9873f;hp=c0f055441930ab8718cd4d4347325bd6671dc2fc;hb=256dd999d11736ebe5ad2865219879199c89cc90;hpb=d1238495fdaf1c85447690231bf5d1838b83bf88

diff --git a/urcu-qsbr.c b/urcu-qsbr.c
index c0f0554..d1f5d91 100644
--- a/urcu-qsbr.c
+++ b/urcu-qsbr.c
@@ -114,9 +114,6 @@ static void wait_for_quiescent_state(void)
 {
 	struct reader_registry *index;
 
-        if (rcu_reader_qs_gp & 1)
-            rcu_reader_qs_gp = urcu_gp_ctr + 1;
-
 	if (!registry)
 		return;
 	/*
@@ -148,12 +145,27 @@ static void wait_for_quiescent_state(void)
 
 void synchronize_rcu(void)
 {
+	int was_online;
+
+	was_online = rcu_reader_qs_gp & 1;
+
+	/*
+	 * Mark the writer thread offline to make sure we don't wait for
+	 * our own quiescent state. This allows using synchronize_rcu() in
+	 * threads registered as readers.
+	 */
+	if (was_online)
+		_rcu_thread_offline();
+
 	internal_urcu_lock();
 	force_mb_all_threads();
 	urcu_gp_ctr += 2;
 	wait_for_quiescent_state();
 	force_mb_all_threads();
 	internal_urcu_unlock();
+
+	if (was_online)
+		_rcu_thread_online();
 }
 
 /*