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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"
)
// Seconds reports the number of seconds since the Unix epoch,
// January 1, 1970 00:00:00 UTC.
func Seconds() int64 {
sec, _, err := os.Time()
if err != nil {
panic(err)
}
return sec
}
// Nanoseconds reports the number of nanoseconds since the Unix epoch,
// January 1, 1970 00:00:00 UTC.
func Nanoseconds() int64 {
sec, nsec, err := os.Time()
if err != nil {
panic(err)
}
return sec*1e9 + nsec
}
// 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
}
// 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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