}
	debugln := func(args ...interface{}) {
		if debug {
			fmt.Println(args...)
		}
	}
	// Inject random reader/writer sleeps.
	const maxSleep = int(1 * time.Millisecond)
	doSleep := !testing.Short()
	rb := New(4 << 10).SetBlocking(true)

	// Reader
	var readErr error
	var wg sync.WaitGroup
	wg.Add(1)
	go func() {
		readRng := rand.New(rand.NewSource(1))
		defer wg.Done()

// Functions exported from Go.
extern void GoSleep();

struct cgoContextArg {
	uintptr_t context;
};

void gprofCgoContext(void *arg) {
	((struct cgoContextArg*)arg)->context = 1;
}

void gprofCgoTraceback(void *arg) {
	// spend some time here so the P is more likely to be retaken.
	volatile int i;
	for (i = 0; i < 123456789; i++);
}

void CallGoSleep() {
	GoSleep();

	go C.CallGoSleep()
	go C.CallGoSleep()
	go C.CallGoSleep()
	time.Sleep(1 * time.Second)

	prof := pprof.Lookup("goroutine")
	prof.WriteTo(io.Discard, 1)
	fmt.Println("OK")
}

//export GoSleep
func GoSleep() {
	time.Sleep(time.Hour)

	EvGoStop:            {"GoStop", 5, true, []string{}, nil},
	EvGoSched:           {"GoSched", 5, true, []string{}, nil},
	EvGoPreempt:         {"GoPreempt", 5, true, []string{}, nil},
	EvGoSleep:           {"GoSleep", 5, true, []string{}, nil},
	EvGoBlock:           {"GoBlock", 5, true, []string{}, nil},
	EvGoUnblock:         {"GoUnblock", 5, true, []string{"g", "seq"}, nil}, // in 1.5 format it was {"g"}

Chang, u2takey, Utkarsh Upadhyay, Vadim Markovtsev, voegtlel, Wai Hon Law,
wangsiyu, Wenhao Hu, wenhao.hu, William D. Irons, Yan Facai (颜发才), Yanbo Liang,
Yihong Wang, Yilei (Dolee) Yang, Yong Tang, Yuan (Terry) Tang

# Release 1.8.0

## Major Features And Improvements

*   Can now pass `tf.contrib.distribute.MirroredStrategy()` to