Imported Upstream version 2011.03.07.1upstream/2011.03.07.1

1 files changed, 54 insertions, 0 deletions

diff --git a/src/pkg/time/sys.go b/src/pkg/time/sys.go
new file mode 100644
index 000000000..8a2e6fadc
--- /dev/null
+++ b/src/pkg/time/sys.go
@@ -0,0 +1,54 @@
+// 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
+}