Mercurial > hg > nginx-quic
diff src/os/unix/ngx_x86_mutex.h @ 83:a7e45c45a95c
nginx-0.0.1-2003-04-28-19:06:39 import
author | Igor Sysoev <igor@sysoev.ru> |
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date | Mon, 28 Apr 2003 15:06:39 +0000 |
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new file mode 100644 --- /dev/null +++ b/src/os/unix/ngx_x86_mutex.h @@ -0,0 +1,30 @@ + + +typedef struct { + int lock; +} ngx_mutex_t; + + +static inline int ngx_spin_lock(ngx_mutex_t *m, int count) +{ + int lock; + + __asm__ __volatile(" + +get_lock: + mov $1, %1 + xchg %1, %2 + cmp $0, %1 + jne spin_lock + +spin_lock: + cmp $0, %3 + je failed + + dec %3 + rep nop + cmp $0, %2 + jne spin_lock + + ": "=q" (lock), "m" (m->lock), "q" (count)); +}