38 lines
992 B
Go
38 lines
992 B
Go
// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build linux,race
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package race_test
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import (
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"sync/atomic"
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"syscall"
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"testing"
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"unsafe"
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)
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func TestAtomicMmap(t *testing.T) {
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// Test that atomic operations work on "external" memory. Previously they crashed (#16206).
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// Also do a sanity correctness check: under race detector atomic operations
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// are implemented inside of race runtime.
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mem, err := syscall.Mmap(-1, 0, 1<<20, syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_ANON|syscall.MAP_PRIVATE)
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if err != nil {
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t.Fatalf("mmap failed: %v", err)
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}
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defer syscall.Munmap(mem)
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a := (*uint64)(unsafe.Pointer(&mem[0]))
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if *a != 0 {
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t.Fatalf("bad atomic value: %v, want 0", *a)
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}
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atomic.AddUint64(a, 1)
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if *a != 1 {
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t.Fatalf("bad atomic value: %v, want 1", *a)
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}
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atomic.AddUint64(a, 1)
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if *a != 2 {
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t.Fatalf("bad atomic value: %v, want 2", *a)
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}
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}
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