Différences

Ci-dessous, les différences entre deux révisions de la page.

--- tech:go_lang_-_goroutines [2026/05/06 23:15] – Jean-Baptiste
+++ tech:go_lang_-_goroutines [2026/05/16 15:45] (Version actuelle) – Jean-Baptiste
@@ Ligne 1: / Ligne 1: @@
+<!DOCTYPE markdown>
+{{tag>Brouillon}}
+# Go lang - goroutines
+Voir :
+* https://gobyexample.com/timeouts
+* https://www.geeksforgeeks.org/go-language/select-statement-in-go-language/
+## Pb sortie de main avant terminaisons des goroutines - Attendre la fin de toutes les goroutines avant de terminer le programme (la fonction main)
+Voir :
+* https://stackoverflow.com/questions/18207772/how-to-wait-for-all-goroutines-to-finish-without-using-time-sleep
+* https://leapcell.medium.com/how-to-wait-for-multiple-goroutines-in-go-faf6dce827fc
+* https://groups.google.com/g/golang-nuts/c/mNhXnWLFOo4
+* https://groups.google.com/g/golang-nuts/c/hIo_U_qwv84
+* https://boldlygo.tech/archive/2025-08-06-waiting-for-goroutines/
+* https://nathanleclaire.com/blog/2014/02/15/how-to-wait-for-all-goroutines-to-finish-executing-before-continuing/
+* https://gobyexample.com/waitgroups
+* https://www.reddit.com/r/golang/comments/1y3spq/how_to_wait_for_all_goroutines_to_finish/
+* https://codefinity.com/courses/v2/7f0f48cc-166e-439c-b067-a02fc91cc418/d1ac2dc4-039c-48a1-8392-e2746355d2da/ee461f59-ac15-467f-a700-229e75a8a0e5
+* https://dev.to/neelp03/how-to-use-goroutines-for-concurrent-processing-in-go-34ph
+* https://pkg.go.dev/sync
+* https://medium.com/@hax.artisan/go-monitor-your-goroutine-application-9edbdd6e581b
+Solution naïve
+~~~go
+import (
+	"runtime"
+	"time"
+	)
+func wait_all_goroutines() {
+	for runtime.NumGoroutine() > 1 {
+		time.Sleep(500 * time.Millisecond)
+	}
+}
+func main() {
+	defer fmt.Println("FIN")
+	// Last defer
+	defer wait_all_goroutines()
+	ch := make(chan int)
+	go evenSum(1, 100, ch)
+}
+~~~
+## Afficher les résultats des goroutine de la plus rapide à la plus longue
+Voir :
+* https://gobyexample.com/select
+~~~go
+        ch1 := make(chan int)
+        ch2 := make(chan int)
+        go evenSum(1, 10, ch1)
+        go squareSum(1, 10, ch2)
+        for range 2 {
+                select {
+                case r1 := <-ch1:
+                        fmt.Println(r1)
+                case r2 := <-ch2:
+                        fmt.Println(r2)
+                }
+        }
+~~~
+FIXME