sync/atomic: disable store and load test on a single processor machine

Fixes #3226.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5756073

diff --git a/src/pkg/sync/atomic/atomic_test.go b/src/pkg/sync/atomic/atomic_test.go
index a06c85c3a9e5924a6b2f5ecf412affdc74f41feb..f60d997ce83d5aca8fcadfc0864ff9d597dd1cb8 100644 (file)
--- a/src/pkg/sync/atomic/atomic_test.go
+++ b/src/pkg/sync/atomic/atomic_test.go
@@ -1012,6 +1012,10 @@ func TestHammerStoreLoad(t *testing.T) {
 }
 
 func TestStoreLoadSeqCst32(t *testing.T) {
+       if runtime.NumCPU() == 1 {
+               t.Logf("Skipping test on %v processor machine", runtime.NumCPU())
+               return
+       }
        defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(4))
        N := int32(1e3)
        if testing.Short() {
@@ -1049,6 +1053,10 @@ func TestStoreLoadSeqCst32(t *testing.T) {
 }
 
 func TestStoreLoadSeqCst64(t *testing.T) {
+       if runtime.NumCPU() == 1 {
+               t.Logf("Skipping test on %v processor machine", runtime.NumCPU())
+               return
+       }
        if test64err != nil {
                t.Logf("Skipping 64-bit tests: %v", test64err)
                return
@@ -1090,6 +1098,10 @@ func TestStoreLoadSeqCst64(t *testing.T) {
 }
 
 func TestStoreLoadRelAcq32(t *testing.T) {
+       if runtime.NumCPU() == 1 {
+               t.Logf("Skipping test on %v processor machine", runtime.NumCPU())
+               return
+       }
        defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(4))
        N := int32(1e3)
        if testing.Short() {
@@ -1132,6 +1144,10 @@ func TestStoreLoadRelAcq32(t *testing.T) {
 }
 
 func TestStoreLoadRelAcq64(t *testing.T) {
+       if runtime.NumCPU() == 1 {
+               t.Logf("Skipping test on %v processor machine", runtime.NumCPU())
+               return
+       }
        if test64err != nil {
                t.Logf("Skipping 64-bit tests: %v", test64err)
                return