From c2a3e1b9ceb7eb195f8b51d81b95ae57140dc534 Mon Sep 17 00:00:00 2001
From: Aidan Chalk <aidan.chalk@stfc.ac.uk>
Date: Wed, 26 Apr 2017 13:10:39 +0100
Subject: [PATCH] Changed the use of rand to rand_r to hopefully improve
performance and to be thread-safe
---
src/qsched.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/src/qsched.c b/src/qsched.c
index f6ce8b2..ae99a6a 100644
--- a/src/qsched.c
+++ b/src/qsched.c
@@ -810,7 +810,8 @@ struct task *qsched_gettask ( struct qsched *s , int qid ) {
int naq, k, tid, qids[ s->nr_queues ];
struct task *t;
-
+ unsigned int seed = qid;
+
TIMER_TIC
/* Check if the sched is ok. */
@@ -836,7 +837,7 @@ struct task *qsched_gettask ( struct qsched *s , int qid ) {
if ( k != qid && s->queues[k].count > 0 )
qids[ naq++ ] = k;
while ( naq > 0 ) {
- k = rand() % naq;
+ k = rand_r(&seed) % naq;
TIMER_TIC2
tid = queue_get( &s->queues[ qids[k] ] , s , 0 );
TIMER_TOC( s , qsched_timer_queue )
--
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