Исходники и презентации

lessons/sync_primitives/cond/main.go

@@ -0,0 +1,55 @@
+package main
+
+import (
+	"log"
+	"sync"
+	"time"
+)
+
+func subscribe(name string, data map[string]string, c *sync.Cond) {
+	c.L.Lock()
+
+	for len(data) == 0 {
+		c.Wait()
+	}
+
+	log.Printf("[%s] %s\n", name, data["key"])
+
+	c.L.Unlock()
+}
+
+func publish(name string, data map[string]string, c *sync.Cond) {
+	time.Sleep(time.Second)
+
+	c.L.Lock()
+	data["key"] = "value"
+	c.L.Unlock()
+
+	log.Printf("[%s] data publisher\n", name)
+	c.Broadcast()
+}
+
+func main() {
+	data := map[string]string{}
+	cond := sync.NewCond(&sync.Mutex{})
+
+	wg := sync.WaitGroup{}
+	wg.Add(3)
+
+	go func() {
+		defer wg.Done()
+		subscribe("subscriber_1", data, cond)
+	}()
+
+	go func() {
+		defer wg.Done()
+		subscribe("subscriber_2", data, cond)
+	}()
+
+	go func() {
+		defer wg.Done()
+		publish("publisher", data, cond)
+	}()
+
+	wg.Wait()
+}