res_pjsip: Add reason comment.

........

Merged revisions 433005 from http://svn.asterisk.org/svn/asterisk/branches/13

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@433006 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/res/res_pjsip.c b/res/res_pjsip.c
index f063d7963577771f9cc14af06984647875b11b39..83133b4894b0109710c193f75fafa055a1c5843d 100644 (file)
--- a/res/res_pjsip.c
+++ b/res/res_pjsip.c
@@ -2981,6 +2981,12 @@ static int sync_task(void *data)
 
        std->fail = std->task(std->task_data);
 
+       /*
+        * Once we unlock std->lock after signaling, we cannot access
+        * std again.  The thread waiting within
+        * ast_sip_push_task_synchronous() is free to continue and
+        * release its local variable (std).
+        */
        ast_mutex_lock(&std->lock);
        std->complete = 1;
        ast_cond_signal(&std->cond);