Rendezvous: Difference between revisions

Content added Content deleted

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@@ Line 230: / Line 230: @@
     "fmt"
     "strings"
+    "sync"
 )
@@ Line 249: / Line 250: @@
     reservePrinter := startMonitor(newPrinter(5), nil)
     mainPrinter := startMonitor(newPrinter(5), reservePrinter)
+    var busy sync.WaitGroup
-    hdDone := make(chan int)
+    busy.Add(2)
+    go writer(mainPrinter, "hd", hdText, &busy)
-    mgDone := make(chan int)
-    go writer(mainPrinter, hdText, hdDone)
+    go writer(mainPrinter, "mg", mgText, &busy)
+    busy.Wait()
-    go writer(mainPrinter, mgText, mgDone)
-    <-hdDone
-    <-mgDone
 }
@@ Line 303: / Line 302: @@
 }
-func writer(printer *rSync, text string, done chan int) {
+func writer(printer *rSync, id, text string, busy *sync.WaitGroup) {
     for _, line := range strings.Split(text, "\n", -1) {
         if e := printer.rendezvous(line); e != nil {
-            fmt.Println("**** writer received exception:", e, "****")
+            fmt.Println("**** print job", id, "terminated:", e, "****")
             break
         }
     }
-    done <- 0
+    busy.Done()
 }</lang>
 Output:
-<pre>Old Mother Goose,
+<pre>
+Old Mother Goose,
 Humpty Dumpty sat on a wall.
 Humpty Dumpty had a great fall.
@@ Line 323: / Line 323: @@
 Jack's mother came in,
 And caught the goose soon,
-**** writer received exception: out of ink ****</pre>
+**** print job mg terminated: out of ink ****
+</pre>
 =={{header|Oz}}==