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Message-ID: <tencent_AB6D68C5E505BB0AB73CAFC159C6F7E47D0A@qq.com>
Date: Wed, 17 May 2023 18:07:09 +0800
From: "847567161" <847567161@...com>
To: "musl" <musl@...ts.openwall.com>
Subject: Question：Why musl call a_barrier in __pthread_once?
Hi,
Why musl add a_barrier() in if branch here?
What happend if we remove it? Could you give me more details?
int __pthread_once(pthread_once_t *control, void (*init)(void))
{
/* Return immediately if init finished before, but ensure that
* effects of the init routine are visible to the caller. */
if (*(volatile int *)control == 2) {
a_barrier();
return 0;
}
return __pthread_once_full(control, init);
}
https://gitee.com/openharmony/third_party_musl/blob/master/src/thread/pthread_once.c#L44
Chuang Yin
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