Fix to bug #510, http://bugs.skysql.com/show_bug.cgi?id=510, made every MaxScale thread to call mysql_thread_init() before entering poll_waitevents. Also main thread does this before starting services. Removed all calls to mysql_thread_init() and to mysql_thread_end() from elsewhere than from poll.c:poll_waitevents and from gateway.c:main

skygw_utils.cc: replace_literal: fixed memory leak

server/core/dbusers.c

@@ -187,14 +187,6 @@ getUsers(SERVICE *service, struct users *users)
 	if (service_user == NULL || service_passwd == NULL)
 		return -1;
 
-	/** multi-thread environment requires that thread init succeeds. */
-	if (mysql_thread_init()) {
-		LOGIF(LE, (skygw_log_write_flush(
-                        LOGFILE_ERROR,
-                        "Error : mysql_thread_init failed.")));
-		return -1;
-	}
-    
 	con = mysql_init(NULL);
 
  	if (con == NULL) {
@@ -391,7 +383,6 @@ getUsers(SERVICE *service, struct users *users)
 
 	mysql_free_result(result);
 	mysql_close(con);
-	mysql_thread_end();
 
 	return total_users;
 }