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57 lines
1.3 KiB
57 lines
1.3 KiB
6 years ago
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/*
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Landesamt für Geoinformation und Landentwicklung, Referat 35
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Einführung in die Sprache Go, 25.7.2017
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Lektion 4: Nebenläufigkeit
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*/
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package main
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import (
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"fmt"
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"math"
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"math/rand"
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"runtime"
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"sync"
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"time"
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)
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const (
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anzahlTöpfchen int8 = 25
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anzahlKugeln int32 = 100000
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)
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var timestamp [2]int64
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var wg sync.WaitGroup // !
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func main() {
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runtime.GOMAXPROCS(runtime.NumCPU()) // !
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timestamp[0] = time.Now().UnixNano()
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var töpfchenAlle []int = make([]int, anzahlTöpfchen, anzahlTöpfchen)
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for k := (int32)(1); k <= anzahlKugeln; k++ {
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wg.Add(1)
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go zeigeMirDenGauß(int(anzahlKugeln), int(anzahlTöpfchen), &töpfchenAlle) // !
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}
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wg.Wait() // !
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fmt.Println(töpfchenAlle)
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timestamp[1] = time.Now().UnixNano()
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fmt.Printf("\nProzess ist fertig und hat %v Sekunden gedauert!\n\n", float64(timestamp[1]-timestamp[0])*math.Pow(10, -9))
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}
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func zeigeMirDenGauß(anzahlKugeln int, anzahlTöpfchen int, töpfchenAlle *[]int) { // kleines z genügt
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defer wg.Done() // !
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var töpfchenTmpZähler int
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for i := 0; i < anzahlTöpfchen-1; i++ {
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if yesnotrigger := func() bool {
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if rand.New(rand.NewSource(time.Now().UnixNano())).Float64() < 0.5 {
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return true
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} else {
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return false
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}
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}(); yesnotrigger == true {
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töpfchenTmpZähler++
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}
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}
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(*töpfchenAlle)[töpfchenTmpZähler]++
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}
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