net: run all timeout tests in parallel

For #10571.

Change-Id: I9a42226078b9c52dbe0c65cb101b5f452233e911
Reviewed-on: https://go-review.googlesource.com/18205
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Mikio Hara <mikioh.mikioh@gmail.com>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Author: rsc

src/net/timeout_test.go

@@ -33,6 +33,7 @@ var dialTimeoutTests = []struct {
 }
 
 func TestDialTimeout(t *testing.T) {
+	// Cannot use t.Parallel - modifies global hooks.
 	origTestHookDialChannel := testHookDialChannel
 	defer func() { testHookDialChannel = origTestHookDialChannel }()
 	defer sw.Set(socktest.FilterConnect, nil)
@@ -110,6 +111,8 @@ var acceptTimeoutTests = []struct {
 }
 
 func TestAcceptTimeout(t *testing.T) {
+	t.Parallel()
+
 	switch runtime.GOOS {
 	case "plan9":
 		t.Skipf("not supported on %s", runtime.GOOS)
@@ -161,6 +164,8 @@ func TestAcceptTimeout(t *testing.T) {
 }
 
 func TestAcceptTimeoutMustReturn(t *testing.T) {
+	t.Parallel()
+
 	switch runtime.GOOS {
 	case "plan9":
 		t.Skipf("not supported on %s", runtime.GOOS)
@@ -205,6 +210,8 @@ func TestAcceptTimeoutMustReturn(t *testing.T) {
 }
 
 func TestAcceptTimeoutMustNotReturn(t *testing.T) {
+	t.Parallel()
+
 	switch runtime.GOOS {
 	case "plan9":
 		t.Skipf("not supported on %s", runtime.GOOS)
@@ -254,6 +261,8 @@ var readTimeoutTests = []struct {
 }
 
 func TestReadTimeout(t *testing.T) {
+	t.Parallel()
+
 	switch runtime.GOOS {
 	case "plan9":
 		t.Skipf("not supported on %s", runtime.GOOS)
@@ -313,6 +322,8 @@ func TestReadTimeout(t *testing.T) {
 }
 
 func TestReadTimeoutMustNotReturn(t *testing.T) {
+	t.Parallel()
+
 	switch runtime.GOOS {
 	case "plan9":
 		t.Skipf("not supported on %s", runtime.GOOS)
@@ -454,6 +465,8 @@ var writeTimeoutTests = []struct {
 }
 
 func TestWriteTimeout(t *testing.T) {
+	t.Parallel()
+
 	switch runtime.GOOS {
 	case "plan9":
 		t.Skipf("not supported on %s", runtime.GOOS)
@@ -500,6 +513,8 @@ func TestWriteTimeout(t *testing.T) {
 }
 
 func TestWriteTimeoutMustNotReturn(t *testing.T) {
+	t.Parallel()
+
 	switch runtime.GOOS {
 	case "plan9":
 		t.Skipf("not supported on %s", runtime.GOOS)
@@ -569,6 +584,8 @@ var writeToTimeoutTests = []struct {
 }
 
 func TestWriteToTimeout(t *testing.T) {
+	t.Parallel()
+
 	switch runtime.GOOS {
 	case "nacl", "plan9":
 		t.Skipf("not supported on %s", runtime.GOOS)
@@ -620,6 +637,8 @@ func TestWriteToTimeout(t *testing.T) {
 }
 
 func TestReadTimeoutFluctuation(t *testing.T) {
+	t.Parallel()
+
 	switch runtime.GOOS {
 	case "plan9":
 		t.Skipf("not supported on %s", runtime.GOOS)
@@ -656,6 +675,8 @@ func TestReadTimeoutFluctuation(t *testing.T) {
 }
 
 func TestReadFromTimeoutFluctuation(t *testing.T) {
+	t.Parallel()
+
 	switch runtime.GOOS {
 	case "plan9":
 		t.Skipf("not supported on %s", runtime.GOOS)
@@ -692,6 +713,8 @@ func TestReadFromTimeoutFluctuation(t *testing.T) {
 }
 
 func TestWriteTimeoutFluctuation(t *testing.T) {
+	t.Parallel()
+
 	switch runtime.GOOS {
 	case "plan9":
 		t.Skipf("not supported on %s", runtime.GOOS)
@@ -731,12 +754,27 @@ func TestWriteTimeoutFluctuation(t *testing.T) {
 	}
 }
 
+func TestVariousDeadlines(t *testing.T) {
+	t.Parallel()
+	testVariousDeadlines(t)
+}
+
 func TestVariousDeadlines1Proc(t *testing.T) {
-	testVariousDeadlines(t, 1)
+	// Cannot use t.Parallel - modifies global GOMAXPROCS.
+	if testing.Short() {
+		t.Skip("skipping in short mode")
+	}
+	defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(1))
+	testVariousDeadlines(t)
 }
 
 func TestVariousDeadlines4Proc(t *testing.T) {
-	testVariousDeadlines(t, 4)
+	// Cannot use t.Parallel - modifies global GOMAXPROCS.
+	if testing.Short() {
+		t.Skip("skipping in short mode")
+	}
+	defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(4))
+	testVariousDeadlines(t)
 }
 
 type neverEnding byte
@@ -748,14 +786,12 @@ func (b neverEnding) Read(p []byte) (int, error) {
 	return len(p), nil
 }
 
-func testVariousDeadlines(t *testing.T, maxProcs int) {
+func testVariousDeadlines(t *testing.T) {
 	switch runtime.GOOS {
 	case "plan9":
 		t.Skipf("not supported on %s", runtime.GOOS)
 	}
 
-	defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(maxProcs))
-
 	type result struct {
 		n   int64
 		err error
@@ -869,6 +905,8 @@ func testVariousDeadlines(t *testing.T, maxProcs int) {
 // TestReadWriteProlongedTimeout tests concurrent deadline
 // modification. Known to cause data races in the past.
 func TestReadWriteProlongedTimeout(t *testing.T) {
+	t.Parallel()
+
 	switch runtime.GOOS {
 	case "plan9":
 		t.Skipf("not supported on %s", runtime.GOOS)
@@ -947,6 +985,8 @@ func TestReadWriteProlongedTimeout(t *testing.T) {
 }
 
 func TestReadWriteDeadlineRace(t *testing.T) {
+	t.Parallel()
+
 	switch runtime.GOOS {
 	case "nacl", "plan9":
 		t.Skipf("not supported on %s", runtime.GOOS)