1 files changed, 89 insertions, 0 deletions
diff --git a/packages/Python/lldbsuite/test/lang/go/goroutines/main.go b/packages/Python/lldbsuite/test/lang/go/goroutines/main.go
new file mode 100644
index 0000000..bb44f7b
--- /dev/null
+++ b/packages/Python/lldbsuite/test/lang/go/goroutines/main.go
@@ -0,0 +1,89 @@
+package main
+
+import (
+	"fmt"
+	"runtime"
+)
+
+type philosopher struct {
+	i int
+	forks [2]chan bool
+	eating chan int
+	done  chan struct{}
+}
+
+func (p philosopher) run() {
+	for {
+		select {
+		case <-p.done:
+			return
+		case <-p.forks[0]:
+			p.eat()
+		}
+	}
+}
+
+func (p philosopher) eat() {
+	select {
+	case <-p.done:
+		return
+	case <-p.forks[1]:
+		p.eating <- p.i
+		p.forks[0] <- true
+		p.forks[1] <- true
+		runtime.Gosched()
+	}
+}
+
+func startPhilosophers(n int) (chan struct{}, chan int) {
+	philosophers := make([]*philosopher, n)
+	chans := make([]chan bool, n)
+	for i := range chans {
+		chans[i] = make(chan bool, 1)
+		chans[i] <- true
+	}
+	eating := make(chan int, n)
+	done := make(chan struct{})
+	for i := range philosophers {
+		var min, max int
+		if i == n - 1 {
+			min = 0
+			max = i
+		} else {
+			min = i
+			max = i + 1
+		}
+		philosophers[i] = &philosopher{i: i, forks: [2]chan bool{chans[min], chans[max]}, eating: eating, done: done}
+		go philosophers[i].run()
+	}
+	return done, eating
+}
+
+func wait(c chan int) {
+	fmt.Println(<- c)
+	runtime.Gosched()
+}
+
+func main() {
+	// Restrict go to 1 real thread so we can be sure we're seeing goroutines
+	// and not threads.
+	runtime.GOMAXPROCS(1)
+	// Create a bunch of goroutines
+	done, eating := startPhilosophers(20) // stop1
+	// Now turn up the number of threads so this goroutine is likely to get
+	// scheduled on a different thread.
+	runtime.GOMAXPROCS(runtime.NumCPU()) // stop2
+	// Now let things run. Hopefully we'll bounce around
+	wait(eating)
+	wait(eating)
+	wait(eating)
+	wait(eating)
+	wait(eating)
+	wait(eating)
+	wait(eating)
+	wait(eating)
+	wait(eating)
+	wait(eating)
+	close(done)
+	fmt.Println("done") // stop3
+}