From 4eddec7989d4254cd20b696e92e5d2671068c90b Mon Sep 17 00:00:00 2001
From: Sriram Patil <spsrirampatil@gmail.com>
Date: Wed, 20 May 2015 17:47:58 +0530
Subject: [PATCH] Fixed MXS - 165: Concurrency issue while incrementing
 sessions in qlafilter

---
 server/modules/filter/qlafilter.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/server/modules/filter/qlafilter.c b/server/modules/filter/qlafilter.c
index 5362cf61e..3c358cda1 100644
--- a/server/modules/filter/qlafilter.c
+++ b/server/modules/filter/qlafilter.c
@@ -50,6 +50,7 @@
 #include <sys/time.h>
 #include <regex.h>
 #include <string.h>
+#include <atomic.h>
 
 /** Defined in log_manager.cc */
 extern int            lm_enabled_logfiles_bitmask;
@@ -304,7 +305,9 @@ char		*remote, *userName;
 		sprintf(my_session->filename, "%s.%d", 
 			my_instance->filebase,
 			my_instance->sessions);
-		my_instance->sessions++;
+
+        // Multiple sessions can try to update my_instance->sessions simultaneously
+		atomic_add(&(my_instance->sessions), 1);
 		
 		if (my_session->active)
 		{