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runtime: fix select pass 3
Fixes #2075 R=rsc, ken, r CC=golang-dev https://golang.org/cl/4748045
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@ -1167,12 +1167,15 @@ loop:
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static void
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dequeueg(WaitQ *q, Hchan *c)
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{
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SudoG **l, *sgp;
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for(l=&q->first; (sgp=*l) != nil; l=&sgp->link) {
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SudoG **l, *sgp, *prevsgp;
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prevsgp = nil;
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for(l=&q->first; (sgp=*l) != nil; l=&sgp->link, prevsgp=sgp) {
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if(sgp->g == g) {
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*l = sgp->link;
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freesg(c, sgp);
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if(q->last == sgp)
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q->last = prevsgp;
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break;
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}
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}
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34
test/chan/select6.go
Normal file
34
test/chan/select6.go
Normal file
@ -0,0 +1,34 @@
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// $G $D/$F.go && $L $F.$A && ./$A.out
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// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Issue 2075
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// A bug in select corrupts channel queues of failed cases
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// if there are multiple waiters on those channels and the
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// select is the last in the queue. If further waits are made
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// on the channel without draining it first then those waiters
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// will never wake up. In the code below c1 is such a channel.
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package main
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func main() {
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c1 := make(chan bool)
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c2 := make(chan bool)
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c3 := make(chan bool)
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go func() { <-c1 }()
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go func() {
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select {
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case <-c1:
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panic("dummy")
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case <-c2:
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c3 <- true
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}
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<-c1
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}()
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go func() { c2 <- true }()
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<-c3
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c1 <- true
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c1 <- true
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}
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