56 lines
788 B
Go
56 lines
788 B
Go
|
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()
|
||
|
|
}
|