1 files changed, 42 insertions, 0 deletions
diff --git a/src/lib/time/tick.go b/src/lib/time/tick.go
new file mode 100644
index 000000000..efd5ceb25
--- /dev/null
+++ b/src/lib/time/tick.go
@@ -0,0 +1,42 @@
+// 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 (
+	"syscall";
+	"time"
+)
+
+// TODO(rsc): This implementation of time.Tick is a
+// simple placeholder.  Eventually, there will need to be
+// a single central time server no matter how many tickers
+// are active.  There also needs to be a way to cancel a ticker.
+//
+// Also, if timeouts become part of the select statement,
+// perhaps the Ticker is just:
+//
+//	func Ticker(ns int64, c *chan int64) {
+//		for {
+//			select { timeout ns: }
+//			nsec, err := time.Nanoseconds();
+//			c <- nsec;
+//		}
+
+func Ticker(ns int64, c *chan int64) {
+	var tv syscall.Timeval;
+	for {
+		syscall.nstotimeval(ns, &tv);
+		syscall.Syscall6(syscall.SYS_SELECT, 0, 0, 0, 0, syscall.TimevalPtr(&tv), 0);
+		nsec, err := time.Nanoseconds();
+		c <- nsec;
+	}
+}
+
+export func Tick(ns int64) *chan int64 {
+	c := new(chan int64);
+	go Ticker(ns, c);
+	return c;
+}
+