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Source file test/fixedbugs/issue11256.go

Documentation: test/fixedbugs

  // run
  
  // Copyright 2015 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.
  
  // Test that stack barriers are reset when a goroutine exits without
  // returning.
  
  package main
  
  import (
  	"runtime"
  	"sync/atomic"
  	"time"
  )
  
  func main() {
  	// Let the garbage collector run concurrently.
  	runtime.GOMAXPROCS(2)
  
  	var x [100][]byte
  
  	for i := range x {
  		var done int32
  
  		go func() {
  			// Use enough stack to get stack barriers, but
  			// not so much that we go over _FixedStack.
  			// There's a very narrow window here on most
  			// OSs, so we basically can't do anything (not
  			// even a time.Sleep or a channel).
  			var buf [1024]byte
  			buf[0]++
  			for atomic.LoadInt32(&done) == 0 {
  				runtime.Gosched()
  			}
  			atomic.StoreInt32(&done, 0)
  			// Exit without unwinding stack barriers.
  			runtime.Goexit()
  		}()
  
  		// Generate some garbage.
  		x[i] = make([]byte, 1024*1024)
  
  		// Give GC some time to install stack barriers in the G.
  		time.Sleep(50 * time.Microsecond)
  		atomic.StoreInt32(&done, 1)
  		for atomic.LoadInt32(&done) == 1 {
  			runtime.Gosched()
  		}
  	}
  }
  

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