From: Heng Li <lh3@me.com>
Date: Wed, 9 Oct 2013 16:51:34 +0000 (-0400)
Subject: fixed a dead loop when n_threads==1
X-Git-Tag: spawn-final~4
X-Git-Url: http://www.kaiwu.me/postgresql/commit/?a=commitdiff_plain;h=326cf675b2d32b99c37a12acd45d116ee202cea8;p=klib.git

fixed a dead loop when n_threads==1
---

diff --git a/kthread.c b/kthread.c
index 8260db0..0833cfd 100644
--- a/kthread.c
+++ b/kthread.c
@@ -87,7 +87,7 @@ static inline int steal_work(kt_for_t *f) // steal work from the worker with the
 	for (i = 0; i < f->n; ++i)
 		if (max < dq_size(f->w[i].q)) // max is not accurate as other workers may steal from the same queue, but it does not matter.
 			max = dq_size(f->w[i].q), max_i = i;
-	if (dq_deq(f->w[max_i].q, 0, &k) < 0) k = -1;
+	if (max_i < 0 || dq_deq(f->w[max_i].q, 0, &k) < 0) k = -1;
 	return k;
 }