From: Pierre-Marc Fournier <pierre-marc.fournier@polymtl.ca>
Date: Fri, 26 Jun 2009 02:51:21 +0000 (-0400)
Subject: initialize correctly urcu library
X-Git-Tag: v1.9.1~956
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=26cc701717a287000ac502bbadc451c3a0d76534;p=lttng-ust.git

initialize correctly urcu library
---

diff --git a/libust/tracectl.c b/libust/tracectl.c
index 5ccd1f5e..97ab2eb1 100644
--- a/libust/tracectl.c
+++ b/libust/tracectl.c
@@ -26,6 +26,8 @@
 #include <fcntl.h>
 #include <poll.h>
 
+#include <urcu.h>
+
 #include "marker.h"
 #include "tracer.h"
 #include "localerr.h"
@@ -106,8 +108,13 @@ void do_command(struct tracecmd *cmd)
 {
 }
 
-void receive_commands()
+/* This needs to be called whenever a new thread is created. It notifies
+ * liburcu of the new thread.
+ */
+
+void ust_register_thread(void)
 {
+	rcu_register_thread();
 }
 
 int fd_notif = -1;
@@ -224,6 +231,8 @@ void *listener_main(void *p)
 {
 	int result;
 
+	ust_register_thread();
+
 	DBG("LISTENER");
 
 	for(;;) {
@@ -803,6 +812,12 @@ static void auto_probe_connect(struct marker *m)
 
 static void __attribute__((constructor(101))) init0()
 {
+	/* Initialize RCU in case the constructor order is not good. */
+	urcu_init();
+
+	/* It is important to do this before events start to be generated. */
+	ust_register_thread();
+
 	DBG("UST_AUTOPROBE constructor");
 	if(getenv("UST_AUTOPROBE")) {
 		marker_set_new_marker_cb(auto_probe_connect);