Merge lp:~sergei.glushchenko/percona-server/5.5-ps-bug1249193 into lp:percona-server/5.5

[Sergei Glushchenko]

Port Oracle's fix.
Manual testing before fix showed constant crash with provided test case. After the fix I was unable to crash the server. No MTR test case because of MTR limitations.

http://jenkins.percona.com/view/PS%205.5/job/percona-server-5.5-param/953/

[Laurynas Biveinis (laurynas-biveinis)]

review: Approve

=== modified file 'sql/mysqld.cc'
--- sql/mysqld.cc	2014-02-03 04:39:37 +0000
+++ sql/mysqld.cc	2014-02-16 23:47:26 +0000
@@ -2713,10 +2713,21 @@
     should not be any other mysql_cond_signal() calls.
   */
   mysql_mutex_lock(&LOCK_thread_count);
+  mysql_cond_broadcast(&COND_thread_count);
   mysql_mutex_unlock(&LOCK_thread_count);
-  mysql_cond_broadcast(&COND_thread_count);
-
-  (void) pthread_sigmask(SIG_BLOCK,&set,NULL);
+
+  /*
+    Waiting for until mysqld_server_started != 0
+    to ensure that all server components has been successfully
+    initialized. This step is mandatory since signal processing
+    could be done safely only when all server components
+    has been initialized.
+  */
+  mysql_mutex_lock(&LOCK_server_started);
+  while (!mysqld_server_started)
+    mysql_cond_wait(&COND_server_started, &LOCK_server_started);
+  mysql_mutex_unlock(&LOCK_server_started);
+
   for (;;)
   {
     int error;					// Used when debugging