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80 lines
1.3 KiB
Go
80 lines
1.3 KiB
Go
package main
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import (
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"fmt"
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"os"
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"os/signal"
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"runtime"
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"sync"
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"time"
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"gopkg.in/DataDog/dd-trace-go.v1/profiler"
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)
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func main() {
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if err := run(); err != nil {
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fmt.Fprintln(os.Stderr, err)
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os.Exit(1)
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}
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}
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func run() error {
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if err := os.Setenv("DD_PROFILING_WAIT_PROFILE", "yes"); err != nil {
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return err
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} else if err := profiler.Start(
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profiler.WithService("stuck-deadlock"),
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profiler.WithVersion(time.Now().String()),
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profiler.WithPeriod(60*time.Second),
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profiler.WithProfileTypes(
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profiler.GoroutineProfile,
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),
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); err != nil {
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return err
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}
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var (
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a = &sync.Mutex{}
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b = &sync.Mutex{}
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)
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go bob(a, b)
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go alice(a, b)
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c := make(chan os.Signal, 1)
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signal.Notify(c, os.Interrupt)
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ticker := time.NewTicker(10 * time.Second)
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defer ticker.Stop()
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for {
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select {
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case <-ticker.C:
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// force gc on a regular basis to make sure g.waitsince gets populated.
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fmt.Printf("gc\n")
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runtime.GC()
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case sig := <-c:
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fmt.Printf("sig: %s\n", sig)
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return nil
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}
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}
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return nil
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}
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func bob(a, b *sync.Mutex) {
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for {
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fmt.Println("bob is okay")
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a.Lock()
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b.Lock()
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// do stuff
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a.Unlock()
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b.Unlock()
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}
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}
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func alice(a, b *sync.Mutex) {
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for {
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fmt.Println("alice is okay")
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b.Lock()
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a.Lock()
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// do stuff
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b.Unlock()
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a.Unlock()
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}
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}
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