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// Copyright 2009 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.
package time
import (
"os"
"syscall"
)
// Sleep pauses the current goroutine for at least ns nanoseconds.
// Higher resolution sleeping may be provided by syscall.Nanosleep
// on some operating systems.
func Sleep(ns int64) os.Error {
_, err := sleep(Nanoseconds(), ns)
return err
}
// After waits at least ns nanoseconds before sending the current time
// on the returned channel.
func After(ns int64) <-chan int64 {
t := Nanoseconds()
ch := make(chan int64, 1)
go func() {
t, _ = sleep(t, ns)
ch <- t
}()
return ch
}
// sleep takes the current time and a duration,
// pauses for at least ns nanoseconds, and
// returns the current time and an error.
func sleep(t, ns int64) (int64, os.Error) {
// TODO(cw): use monotonic-time once it's available
end := t + ns
for t < end {
errno := syscall.Sleep(end - t)
if errno != 0 && errno != syscall.EINTR {
return 0, os.NewSyscallError("sleep", errno)
}
t = Nanoseconds()
}
return t, nil
}
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