func (cp *compiler) pipeline(n *parse.Pipeline) op {
ops := cp.forms(n.Forms)
p := n.Begin()
return func(ec *evalCtx) {
var nextIn *port
errors := make([]Error, len(ops))
finished := make(chan bool, len(ops))
// For each form, create a dedicated evalCtx and run asynchronously
for i, op := range ops {
newEc := ec.fork(fmt.Sprintf("form op %v", op))
if i > 0 {
newEc.ports[0] = nextIn
}
if i < len(ops)-1 {
// Each internal port pair consists of a (byte) pipe pair and a
// channel.
// os.Pipe sets O_CLOEXEC, which is what we want.
reader, writer, e := os.Pipe()
if e != nil {
ec.errorf(p, "failed to create pipe: %s", e)
}
ch := make(chan Value, pipelineChanBufferSize)
newEc.ports[1] = &port{
f: writer, ch: ch, closeF: true, closeCh: true}
nextIn = &port{
f: reader, ch: ch, closeF: true, closeCh: false}
}
thisOp := op
thisError := &errors[i]
go func() {
(*thisError).inner = newEc.peval(thisOp)
newEc.closePorts()
finished <- true
}()
}
// Wait for all forms to finish
for i := 0; i < len(ops); i++ {
<-finished
}
if !allok(errors) {
if len(errors) == 1 {
throw(errors[0].inner)
} else {
throw(multiError{errors})
}
}
}
}
func (cp *compiler) pipelineOp(n *parse.Pipeline) Op {
return Op{cp.pipeline(n), n.Begin(), n.End()}
}
func (cp *compiler) pipeline(n *parse.Pipeline) Op {
ops := cp.forms(n.Forms)
p := n.Begin()
return func(ec *EvalCtx) {
var nextIn *Port
errorChans := make([]chan Error, len(ops))
// For each form, create a dedicated evalCtx and run asynchronously
for i, op := range ops {
newEc := ec.fork(fmt.Sprintf("form op %v", op))
if i > 0 {
newEc.ports[0] = nextIn
}
if i < len(ops)-1 {
// Each internal port pair consists of a (byte) pipe pair and a
// channel.
// os.Pipe sets O_CLOEXEC, which is what we want.
reader, writer, e := os.Pipe()
if e != nil {
ec.errorf(p, "failed to create pipe: %s", e)
}
ch := make(chan Value, pipelineChanBufferSize)
newEc.ports[1] = &Port{
File: writer, Chan: ch, CloseFile: true, CloseChan: true}
nextIn = &Port{
File: reader, Chan: ch, CloseFile: true, CloseChan: false}
}
thisOp := op
errorChans[i] = make(chan Error)
thisErrorChan := errorChans[i]
go func() {
err := newEc.PEval(thisOp)
// Logger.Printf("closing ports of %s", newEc.context)
ClosePorts(newEc.ports)
thisErrorChan <- Error{err}
}()
}
intCh := make(chan os.Signal)
signal.Notify(intCh, syscall.SIGINT)
interrupted := make(chan struct{})
cancel := make(chan struct{}, 1)
go func() {
// When SIGINT is received, sleep for InterruptDeadline before the
// closing interrupted channel.
select {
case <-intCh:
case <-cancel:
return
}
select {
case <-time.After(InterruptDeadline):
case <-cancel:
return
}
close(interrupted)
}()
// Wait for all forms to finish and collect error returns, unless an
// interrupt was received and the form didn't quit within
// InterruptDeadline.
errors := make([]Error, len(ops))
for i, errorChan := range errorChans {
select {
case errors[i] = <-errorChan:
case <-interrupted:
errors[i] = Error{ErrStillRunning}
}
}
// Make sure the SIGINT listener exits.
close(cancel)
signal.Stop(intCh)
// Make sure I am in foreground.
if PutInForeground && sys.IsATTY(0) {
err := sys.Tcsetpgrp(0, syscall.Getpgrp())
if err != nil {
throw(err)
}
}
if !allok(errors) {
if len(errors) == 1 {
throw(errors[0].inner)
} else {
throw(multiError{errors})
}
}
}
}