runtime: fix GOMAXPROCS vs garbage collection bug
Fixes #1715.
R=golang-dev, rsc1, rsc
CC=golang-dev
https://golang.org/cl/4434053
diff --git a/src/pkg/runtime/proc_test.go b/src/pkg/runtime/proc_test.go
new file mode 100644
index 0000000..f544944
--- /dev/null
+++ b/src/pkg/runtime/proc_test.go
@@ -0,0 +1,32 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package runtime_test
+
+import (
+ "runtime"
+ "testing"
+)
+
+func perpetuumMobile() {
+ go perpetuumMobile()
+}
+
+func TestStopTheWorldDeadlock(t *testing.T) {
+ runtime.GOMAXPROCS(3)
+ compl := make(chan int, 1)
+ go func() {
+ for i := 0; i != 1000; i += 1 {
+ runtime.GC()
+ }
+ compl <- 0
+ }()
+ go func() {
+ for i := 0; i != 1000; i += 1 {
+ runtime.GOMAXPROCS(3)
+ }
+ }()
+ go perpetuumMobile()
+ <-compl
+}
