runtime: merge clone0 and clone

We initially added clone0 to handle the case when G or M don't exist, but
it turns out that we could have just modified clone.  (It also helps that
the function we're invoking in clone0 no longer needs arguments.)

As a side-effect, newosproc0 is now supported on all linux archs.

Change-Id: Ie603af75d8f164310fc16446052d83743961f3ca
Reviewed-on: https://go-review.googlesource.com/9164
Reviewed-by: David Crawshaw <crawshaw@golang.org>

1 files changed, 37 insertions, 0 deletions

diff --git a/src/runtime/norace_linux_test.go b/src/runtime/norace_linux_test.go
new file mode 100644
index 0000000000..3f6d4e77e5
--- /dev/null
+++ b/src/runtime/norace_linux_test.go
@@ -0,0 +1,37 @@
+// Copyright 2015 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.
+
+// The file contains tests that can not run under race detector for some reason.
+// +build !race
+
+package runtime_test
+
+import (
+	"runtime"
+	"testing"
+	"time"
+	"unsafe"
+)
+
+var newOSProcDone bool
+
+//go:nosplit
+func newOSProcCreated() {
+	newOSProcDone = true
+}
+
+func TestNewOSProc0(t *testing.T) {
+	runtime.NewOSProc0(0x800000, unsafe.Pointer(runtime.FuncPC(newOSProcCreated)))
+	check, end := time.Tick(1*time.Second), time.Tick(5*time.Second)
+	for {
+		select {
+		case <-check:
+			if newOSProcDone {
+				return
+			}
+		case <-end:
+			t.Fatalf("couldn't create new OS process")
+		}
+	}
+}