From 7b574523c8c3cd6d7aea1e24d20dbc11ef530ba4 Mon Sep 17 00:00:00 2001
From: detailyang <detailyang@gmail.com>
Date: Wed, 6 Mar 2019 16:12:27 +0800
Subject: [PATCH] bugfix: uint64 is never less than 0

---
 queue/ring.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/queue/ring.go b/queue/ring.go
index dfd0b53..d8ac024 100644
--- a/queue/ring.go
+++ b/queue/ring.go
@@ -95,7 +95,7 @@ L:
 
 		n = rb.nodes[pos&rb.mask]
 		seq := atomic.LoadUint64(&n.position)
-		switch dif := seq - pos; {
+		switch dif := int64(seq) - int64(pos); {
 		case dif == 0:
 			if atomic.CompareAndSwapUint64(&rb.queue, pos, pos+1) {
 				break L
@@ -148,7 +148,7 @@ L:
 
 		n = rb.nodes[pos&rb.mask]
 		seq := atomic.LoadUint64(&n.position)
-		switch dif := seq - (pos + 1); {
+		switch dif := int64(seq) - int64(pos + 1); {
 		case dif == 0:
 			if atomic.CompareAndSwapUint64(&rb.dequeue, pos, pos+1) {
 				break L