Imported Upstream version 1.1~hg20130304upstream/1.1_hg20130304

1 files changed, 10 insertions, 9 deletions

diff --git a/src/pkg/os/exec.go b/src/pkg/os/exec.go
index 531b87ca5..5aea3098b 100644
--- a/src/pkg/os/exec.go
+++ b/src/pkg/os/exec.go
@@ -6,6 +6,7 @@ package os
 
 import (
 	"runtime"
+	"sync/atomic"
 	"syscall"
 )
 
@@ -13,7 +14,7 @@ import (
 type Process struct {
 	Pid    int
 	handle uintptr
-	done   bool // process has been successfully waited on
+	isdone uint32 // process has been successfully waited on, non zero if true
 }
 
 func newProcess(pid int, handle uintptr) *Process {
@@ -22,6 +23,14 @@ func newProcess(pid int, handle uintptr) *Process {
 	return p
 }
 
+func (p *Process) setDone() {
+	atomic.StoreUint32(&p.isdone, 1)
+}
+
+func (p *Process) done() bool {
+	return atomic.LoadUint32(&p.isdone) > 0
+}
+
 // ProcAttr holds the attributes that will be applied to a new process
 // started by StartProcess.
 type ProcAttr struct {
@@ -54,14 +63,6 @@ type Signal interface {
 	Signal() // to distinguish from other Stringers
 }
 
-// The only signal values guaranteed to be present on all systems
-// are Interrupt (send the process an interrupt) and
-// Kill (force the process to exit).
-var (
-	Interrupt Signal = syscall.SIGINT
-	Kill      Signal = syscall.SIGKILL
-)
-
 // Getpid returns the process id of the caller.
 func Getpid() int { return syscall.Getpid() }