runtime: avoid closure in parfor test

R=golang-dev, dvyukov
CC=golang-dev
https://golang.org/cl/7395051

src/pkg/runtime/parfor_test.go

@@ -13,6 +13,8 @@ import (
 	"unsafe"
 )
 
+var gdata []uint64
+
 // Simple serial sanity test for parallelfor.
 func TestParFor(t *testing.T) {
 	const P = 1
@@ -22,7 +24,12 @@ func TestParFor(t *testing.T) {
 		data[i] = i
 	}
 	desc := NewParFor(P)
+	// Avoid making func a closure: parfor cannot invoke them.
+	// Since it doesn't happen in the C code, it's not worth doing
+	// just for the test.
+	gdata = data
 	ParForSetup(desc, P, N, nil, true, func(desc *ParFor, i uint32) {
+		data := gdata
 		data[i] = data[i]*data[i] + 1
 	})
 	ParForDo(desc)
@@ -111,7 +118,9 @@ func TestParForParallel(t *testing.T) {
 	P := GOMAXPROCS(-1)
 	c := make(chan bool, P)
 	desc := NewParFor(uint32(P))
+	gdata = data
 	ParForSetup(desc, uint32(P), uint32(N), nil, false, func(desc *ParFor, i uint32) {
+		data := gdata
 		data[i] = data[i]*data[i] + 1
 	})
 	for p := 1; p < P; p++ {