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Why ngx_trylock do extra judgement?

贾凯
July 19, 2014 11:08PM
Hi there,

function ngx_shmtx_lock: if (*mtx->lock == 0 && ngx_atomic_cmp_set(mtx->lock, 0, ngx_pid))
and ngx_trylock (ngx_atomic.h): (*(lock) == 0 && ngx_atomic_cmp_set(lock, 0, 1))

I think ngx_atomic_cmp_set is enough, why Nginx do extra judgement ahead of it ?



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Subject Author Views Posted

Why ngx_trylock do extra judgement?

贾凯 776 July 19, 2014 11:08PM

Re: Why ngx_trylock do extra judgement?

Meng Zhang 344 July 20, 2014 08:40AM



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