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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