initial import

core/syncx/cond.go

@@ -0,0 +1,47 @@
+package syncx
+
+import (
+	"time"
+
+	"zero/core/lang"
+	"zero/core/timex"
+)
+
+type Cond struct {
+	signal chan lang.PlaceholderType
+}
+
+func NewCond() *Cond {
+	return &Cond{
+		signal: make(chan lang.PlaceholderType),
+	}
+}
+
+// WaitWithTimeout wait for signal return remain wait time or timed out
+func (cond *Cond) WaitWithTimeout(timeout time.Duration) (time.Duration, bool) {
+	timer := time.NewTimer(timeout)
+	defer timer.Stop()
+
+	begin := timex.Now()
+	select {
+	case <-cond.signal:
+		elapsed := timex.Since(begin)
+		remainTimeout := timeout - elapsed
+		return remainTimeout, true
+	case <-timer.C:
+		return 0, false
+	}
+}
+
+// Wait for signal
+func (cond *Cond) Wait() {
+	<-cond.signal
+}
+
+// Signal wakes one goroutine waiting on c, if there is any.
+func (cond *Cond) Signal() {
+	select {
+	case cond.signal <- lang.Placeholder:
+	default:
+	}
+}