Fix a race condition in cdr_pgsql that can occur when reloading the module.

Issue 10022, patch by me, with credit to prashant_jois for finding the bug.


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@70554 65c4cc65-6c06-0410-ace0-fbb531ad65f3

cdr/cdr_pgsql.c

@@ -311,8 +311,12 @@ static int unload_module(void)
 
 static int reload(void)
 {
+	int res;
+	ast_mutex_lock(&pgsql_lock);
 	my_unload_module();
-	return my_load_module();
+	res = my_load_module();
+	ast_mutex_lock(&pgsql_lock);
+	return res;
 }
 
 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "PostgreSQL CDR Backend",