你能否让这个“不正确同步”的测试失败？ [英] Can you make this 'incorrectly synchronized' test fail?

问题描述

如果是这样，是否有可能使它失败（在某种程度上而不用改变测试代码本身？

1. Can this test ever fail on x86, x64, ARM?

2. If so, is it possible to make it fail (in some sort of setup) and without changing the test code itself?

func Test_WaitGroup_Simple(t *testing.T) {
    var condition bool
    var wg sync.WaitGroup
    wg.Add(1)
    go func() {
        condition = true
        wg.Done()
    }()
    wg.Wait()
    if !condition {
        t.Error("Condition is false. But expected was true.")
    }
}

推荐答案

它不能。请参阅 WaitGroup.Wait（）意味着在这种情况下的内存屏障？ 。感谢@ OlegGolovanov看看去的ASM。

It can't. See Does WaitGroup.Wait() imply memory barrier in this case?. Thanks a lot to @OlegGolovanov for looking at go's ASM.

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