@@ -33,6 +33,7 @@ import (

 	flag "github.com/docker/docker/pkg/mflag"

 	"github.com/docker/docker/pkg/parsers"

 	"github.com/docker/docker/pkg/parsers/filters"

+	"github.com/docker/docker/pkg/promise"

 	"github.com/docker/docker/pkg/signal"

 	"github.com/docker/docker/pkg/term"

 	"github.com/docker/docker/pkg/timeutils"

@@ -648,7 +649,7 @@ func (cli *DockerCli) CmdStart(args ...string) error {

 		v.Set("stdout", "1")

 		v.Set("stderr", "1")

-		cErr = utils.Go(func() error {

+		cErr = promise.Go(func() error {

 			return cli.hijack("POST", "/containers/"+cmd.Arg(0)+"/attach?"+v.Encode(), tty, in, cli.out, cli.err, nil, nil)

 		})

 	}

@@ -2220,7 +2221,7 @@ func (cli *DockerCli) CmdRun(args ...string) error {

 			}

 		}

-		errCh = utils.Go(func() error {

+		errCh = promise.Go(func() error {

 			return cli.hijack("POST", "/containers/"+runResult.Get("Id")+"/attach?"+v.Encode(), config.Tty, in, out, stderr, hijacked, nil)

 		})

 	} else {

@@ -2477,7 +2478,7 @@ func (cli *DockerCli) CmdExec(args ...string) error {

 			stderr = cli.err

 		}

 	}

-	errCh = utils.Go(func() error {

+	errCh = promise.Go(func() error {

 		return cli.hijack("POST", "/exec/"+execID+"/start", execConfig.Tty, in, out, stderr, hijacked, execConfig)

 	})

@@ -14,9 +14,9 @@ import (

 	"github.com/docker/docker/api"

 	"github.com/docker/docker/dockerversion"

 	"github.com/docker/docker/pkg/log"

+	"github.com/docker/docker/pkg/promise"

 	"github.com/docker/docker/pkg/stdcopy"

 	"github.com/docker/docker/pkg/term"

-	"github.com/docker/docker/utils"

 )

 func (cli *DockerCli) dial() (net.Conn, error) {

@@ -78,7 +78,7 @@ func (cli *DockerCli) hijack(method, path string, setRawTerminal bool, in io.Rea

 	}

 	if stdout != nil || stderr != nil {

-		receiveStdout = utils.Go(func() (err error) {

+		receiveStdout = promise.Go(func() (err error) {

 			defer func() {

 				if in != nil {

 					if setRawTerminal && cli.isTerminalIn {

@@ -104,7 +104,7 @@ func (cli *DockerCli) hijack(method, path string, setRawTerminal bool, in io.Rea

 		})

 	}

-	sendStdin := utils.Go(func() error {

+	sendStdin := promise.Go(func() error {

 		if in != nil {

 			io.Copy(rwc, in)

 			log.Debugf("[hijack] End of stdin")

@@ -23,6 +23,7 @@ import (

 	imagepkg "github.com/docker/docker/image"

 	"github.com/docker/docker/pkg/log"

 	"github.com/docker/docker/pkg/parsers"

+	"github.com/docker/docker/pkg/promise"

 	"github.com/docker/docker/pkg/symlink"

 	"github.com/docker/docker/pkg/system"

 	"github.com/docker/docker/pkg/tarsum"

@@ -516,7 +517,7 @@ func (b *Builder) create() (*daemon.Container, error) {

 func (b *Builder) run(c *daemon.Container) error {

 	var errCh chan error

 	if b.Verbose {

-		errCh = utils.Go(func() error {

+		errCh = promise.Go(func() error {

 			// FIXME: call the 'attach' job so that daemon.Attach can be made private

 			//

 			// FIXME (LK4D4): Also, maybe makes sense to call "logs" job, it is like attach

@@ -10,6 +10,7 @@ import (

 	"github.com/docker/docker/pkg/ioutils"

 	"github.com/docker/docker/pkg/jsonlog"

 	"github.com/docker/docker/pkg/log"

+	"github.com/docker/docker/pkg/promise"

 	"github.com/docker/docker/utils"

 )

@@ -246,7 +247,7 @@ func (daemon *Daemon) Attach(streamConfig *StreamConfig, openStdin, stdinOnce, t

 		}()

 	}

-	return utils.Go(func() error {

+	return promise.Go(func() error {

 		defer func() {

 			if cStdout != nil {

 				cStdout.Close()

@@ -27,6 +27,7 @@ import (

 	"github.com/docker/docker/pkg/log"

 	"github.com/docker/docker/pkg/networkfs/etchosts"

 	"github.com/docker/docker/pkg/networkfs/resolvconf"

+	"github.com/docker/docker/pkg/promise"

 	"github.com/docker/docker/pkg/symlink"

 	"github.com/docker/docker/runconfig"

 	"github.com/docker/docker/utils"

@@ -1117,7 +1118,7 @@ func (container *Container) waitForStart() error {

 	// process or until the process is running in the container

 	select {

 	case <-container.monitor.startSignal:

-	case err := <-utils.Go(container.monitor.Start):

+	case err := <-promise.Go(container.monitor.Start):

 		return err

 	}

@@ -15,6 +15,7 @@ import (

 	"github.com/docker/docker/pkg/broadcastwriter"

 	"github.com/docker/docker/pkg/ioutils"

 	"github.com/docker/docker/pkg/log"

+	"github.com/docker/docker/pkg/promise"

 	"github.com/docker/docker/runconfig"

 	"github.com/docker/docker/utils"

 )

@@ -254,7 +255,7 @@ func (container *Container) Exec(execConfig *execConfig) error {

 	// We use a callback here instead of a goroutine and an chan for

 	// syncronization purposes

-	cErr := utils.Go(func() error { return container.monitorExec(execConfig, callback) })

+	cErr := promise.Go(func() error { return container.monitorExec(execConfig, callback) })

 	// Exec should not return until the process is actually running

 	select {

new file mode 100644

@@ -0,0 +1,11 @@

+package promise

+

+// Go is a basic promise implementation: it wraps calls a function in a goroutine,

+// and returns a channel which will later return the function's return value.

+func Go(f func() error) chan error {

+	ch := make(chan error, 1)

+	go func() {

+		ch <- f()

+	}()

+	return ch

+}

@@ -30,16 +30,6 @@ type KeyValuePair struct {

 	Value string

 }

-// Go is a basic promise implementation: it wraps calls a function in a goroutine,

-// and returns a channel which will later return the function's return value.

-func Go(f func() error) chan error {

-	ch := make(chan error, 1)

-	go func() {

-		ch <- f()

-	}()

-	return ch

-}

-

 // Request a given URL and return an io.Reader

 func Download(url string) (resp *http.Response, err error) {

 	if resp, err = http.Get(url); err != nil {