10 examples of 'goroutine' in Go

44
func goroutine(name string, share chan int) {
45
	for {
46
47
		// Wait to receive a value.
48
		value, ok := <-share
49
		if !ok {
50
51
			// If the channel was closed, return.
52
			fmt.Printf("Goroutine %s Down\n", name)
53
			return
54
		}
55
56
		// Display the value.
57
		fmt.Printf("Goroutine %s Inc %d\n", name, value)
58
59
		// Terminate when the value is 10.
60
		if value == 10 {
61
			close(share)
62
			fmt.Printf("Goroutine %s Down\n", name)
63
			return
64
		}
65
66
		// Increment the value and send it
67
		// over the channel.
68
		share <- (value + 1)
69
	}
70
}

69
func (p *Pool) Go(goroutine func(stop chan bool)) {
70
	p.lock.Lock()
71
	newRoutine := routine{
72
		goroutine: goroutine,
73
		stop:      make(chan bool, 1),
74
	}
75
	p.routines = append(p.routines, newRoutine)
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	p.waitGroup.Add(1)
77
	Go(func() {
78
		goroutine(newRoutine.stop)
79
		p.waitGroup.Done()
80
	})
81
	p.lock.Unlock()
82
}

176
func (c *appClient) retainGoroutine() bool {
177
	c.mtx.Lock()
178
	defer c.mtx.Unlock()
179
	if c.hasQuit() {
180
		return false
181
	}
182
	c.backgroundWait.Add(1)
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	return true
184
}

94
func goRoutineClosure() {
95
96
	const N = 10
97
	m := make(map[int]int)
98
99
	wg := &sync.WaitGroup{}
100
	mu := &sync.Mutex{}
101
	wg.Add(N)
102
	for i := 0; i < N; i++ {
103
		go func(i int) {
104
			defer wg.Done()
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			mu.Lock()
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			m[i] = i
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			mu.Unlock()
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		}(i)
109
	}
110
	wg.Wait()
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	println(len(m))
112
}

29
func doSomeJob(numRoutines int) {
30
	for {
31
		for i := 0; i < numRoutines; i++ {
32
			go allocateAndSum(rand.Intn(1024) * 1024)
33
		}
34
		log.Printf("All %d routines started\n", numRoutines)
35
		time.Sleep(1000 * time.Millisecond)
36
		runtime.GC()
37
	}
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}

52
func (s *PoolScraper) mainLoop(rateType string) {
53
	for {
54
		select {
55
56
		case <-s.shutdown: // user requested shutdown
57
			log.Println("PoolScraper shutting down")
58
			s.cleanup(nil)
59
			return
60
		}
61
	}
62
}

833
func (nc *Conn) spinUpGoRoutines() {
834
	// Make sure everything has exited.
835
	nc.waitForExits()
836
837
	// We will wait on both.
838
	nc.wg.Add(2)
839
840
	// Spin up the readLoop and the socket flusher.
841
	go nc.readLoop()
842
	go nc.flusher()
843
844
	nc.mu.Lock()
845
	if nc.Opts.PingInterval > 0 {
846
		if nc.ptmr == nil {
847
			nc.ptmr = time.AfterFunc(nc.Opts.PingInterval, nc.processPingTimer)
848
		} else {
849
			nc.ptmr.Reset(nc.Opts.PingInterval)
850
		}
851
	}
852
	nc.mu.Unlock()
853
}

69
func (self *CountdownTimer) Wait(routine string) {
70
	// 保存指针
71
	if _, ok := self.Routines[routine]; !ok {
72
		return
73
	}
74
	rt := self.Routines[routine]
75
76
	self.Flag[routine] = make(chan bool)
77
	defer func() {
78
		if err := recover(); err != nil {
79
			logs.Log.Error("动态倒计时器: %v", err)
80
		}
81
		select {
82
		case <-self.Flag[routine]:
83
			n := rt.Curr / 1.2
84
			if n > rt.Min {
85
				rt.Curr = n
86
			} else {
87
				// 等待时间不能小于设定时间
88
				rt.Curr = rt.Min
89
			}
90
91
			if rt.Curr < self.Level[0] {
92
				// 等待时间不能小于最小水平
93
				rt.Curr = self.Level[0]
94
			}
95
		default:
96
			rt.Curr = rt.Curr * 1.2
97
			if rt.Curr > self.Level[len(self.Level)-1] {
98
				// 等待时间不能大于最大水平
99
				rt.Curr = self.Level[len(self.Level)-1]
100
			}
101
		}
102
	}()
103
	for k, v := range self.Level {
104
		if v < rt.Curr {
105
			continue
106
		}
107
108
		if k != 0 && v != rt.Curr {
109
			k--
110
		}
111
		logs.Log.Critical("************************ ……<%s> 倒计时等待 %v 分钟……************************", routine, self.Level[k])
112
		time.Sleep(time.Duration(self.Level[k]) * time.Minute)
113
		break
114
	}
115
	close(self.Flag[routine])
116
}

82
func (s *BinanceScraper) mainLoop() {
83
	close(s.initDone)
84
	for {
85
		select {
86
		case <-s.shutdown: // user requested shutdown
87
			log.Println("BinanceScraper shutting down")
88
			s.cleanup(nil)
89
			return
90
		}
91
	}
92
}

229
func (wnd *Window) MainLoop(run func()) {
230
	// main loop
231
	for !wnd.close {
232
		err := wnd.StartFrame()
233
		if err != nil {
234
			time.Sleep(10 * time.Millisecond)
235
			continue
236
		}
237
238
		for _, event := range wnd.events {
239
			switch e := event.(type) {
240
			case *sdl.WindowEvent:
241
				if e.Event == sdl.WINDOWEVENT_CLOSE {
242
					wnd.close = true
243
				}
244
			case *sdl.QuitEvent:
245
				wnd.close = true
246
			case *sdl.KeyboardEvent:
247
				if e.Type == sdl.KEYDOWN && e.Keysym.Scancode == sdl.SCANCODE_ESCAPE {
248
					wnd.close = true
249
				}
250
			}
251
		}
252
253
		run()
254
255
		wnd.FinishFrame()
256
	}
257
}