Removing extra locks for Pause and Unpause functions

Signed-off-by: Bharath Thiruveedula <bharath_ves@hotmail.com>

daemon/container.go

@@ -766,23 +766,45 @@ func (container *Container) killPossiblyDeadProcess(sig int) error {
 }
 
 func (container *Container) Pause() error {
-	if container.IsPaused() {
+	container.Lock()
+	defer container.Unlock()
+
+	// We cannot Pause the container which is already paused
+	if container.Paused {
 		return fmt.Errorf("Container %s is already paused", container.ID)
 	}
-	if !container.IsRunning() {
+
+	// We cannot Pause the container which is not running
+	if !container.Running {
 		return fmt.Errorf("Container %s is not running", container.ID)
 	}
-	return container.daemon.Pause(container)
+
+	if err := container.daemon.execDriver.Pause(container.command); err != nil {
+		return err
+	}
+	container.Paused = true
+	return nil
 }
 
 func (container *Container) Unpause() error {
-	if !container.IsPaused() {
-		return fmt.Errorf("Container %s is not paused", container.ID)
+	container.Lock()
+	defer container.Unlock()
+
+	// We cannot unpause the container which is not paused
+	if !container.Paused {
+		return fmt.Errorf("Container %s is not paused, so what", container.ID)
 	}
-	if !container.IsRunning() {
+
+	// We cannot unpause the container which is not running
+	if !container.Running {
 		return fmt.Errorf("Container %s is not running", container.ID)
 	}
-	return container.daemon.Unpause(container)
+
+	if err := container.daemon.execDriver.Unpause(container.command); err != nil {
+		return err
+	}
+	container.Paused = false
+	return nil
 }
 
 func (container *Container) Kill() error {

daemon/daemon.go

@@ -1004,22 +1004,6 @@ func (daemon *Daemon) Run(c *Container, pipes *execdriver.Pipes, startCallback e
 	return daemon.execDriver.Run(c.command, pipes, startCallback)
 }
 
-func (daemon *Daemon) Pause(c *Container) error {
-	if err := daemon.execDriver.Pause(c.command); err != nil {
-		return err
-	}
-	c.SetPaused()
-	return nil
-}
-
-func (daemon *Daemon) Unpause(c *Container) error {
-	if err := daemon.execDriver.Unpause(c.command); err != nil {
-		return err
-	}
-	c.SetUnpaused()
-	return nil
-}
-
 func (daemon *Daemon) Kill(c *Container, sig int) error {
 	return daemon.execDriver.Kill(c.command, sig)
 }