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// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Tests a goroutine sitting blocked in a syscall for
// an entire generation. This is a regression test for
// #65196.
//go:build ignore
package main
import (
"log"
"os"
"runtime/trace"
"syscall"
"time"
)
func main() {
// Create a pipe to block on.
var p [2]int
if err := syscall.Pipe(p[:]); err != nil {
log.Fatalf("failed to create pipe: %v", err)
}
rfd, wfd := p[0], p[1]
// Create a goroutine that blocks on the pipe.
done := make(chan struct{})
go func() {
var data [1]byte
_, err := syscall.Read(rfd, data[:])
if err != nil {
log.Fatalf("failed to read from pipe: %v", err)
}
done <- struct{}{}
}()
// Give the goroutine ample chance to block on the pipe.
time.Sleep(10 * time.Millisecond)
// Start tracing.
if err := trace.Start(os.Stdout); err != nil {
log.Fatalf("failed to start tracing: %v", err)
}
// This isn't enough to have a full generation pass by default,
// but it is generally enough in stress mode.
time.Sleep(100 * time.Millisecond)
// Write to the pipe to unblock it.
if _, err := syscall.Write(wfd, []byte{10}); err != nil {
log.Fatalf("failed to write to pipe: %v", err)
}
// Wait for the goroutine to unblock and start running.
// This is helpful to catch incorrect information written
// down for the syscall-blocked goroutine, since it'll start
// executing, and that execution information will be
// inconsistent.
<-done
// Stop tracing.
trace.Stop()
}