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Source file src/runtime/race/race_linux_test.go

Documentation: runtime/race

  // Copyright 2016 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.
  
  // +build linux,race
  
  package race_test
  
  import (
  	"sync/atomic"
  	"syscall"
  	"testing"
  	"unsafe"
  )
  
  func TestAtomicMmap(t *testing.T) {
  	// Test that atomic operations work on "external" memory. Previously they crashed (#16206).
  	// Also do a sanity correctness check: under race detector atomic operations
  	// are implemented inside of race runtime.
  	mem, err := syscall.Mmap(-1, 0, 1<<20, syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_ANON|syscall.MAP_PRIVATE)
  	if err != nil {
  		t.Fatalf("mmap failed: %v", err)
  	}
  	defer syscall.Munmap(mem)
  	a := (*uint64)(unsafe.Pointer(&mem[0]))
  	if *a != 0 {
  		t.Fatalf("bad atomic value: %v, want 0", *a)
  	}
  	atomic.AddUint64(a, 1)
  	if *a != 1 {
  		t.Fatalf("bad atomic value: %v, want 1", *a)
  	}
  	atomic.AddUint64(a, 1)
  	if *a != 2 {
  		t.Fatalf("bad atomic value: %v, want 2", *a)
  	}
  }
  

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