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builtin_expect

__builtin_expect

``` if (t_cachedTid == 0) // __builtin_expect 是一种底层优化 此语句意思是如果还未获取tid 进入if 通过cacheTid()系统调用获取tid { cacheTid(); } ``` ``` if (__builtin_expect(t_cached ......
builtin_expect builtin expect
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