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annotate src/os/unix/ngx_x86_mutex.h @ 83:a7e45c45a95c

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nginx-0.0.1-2003-04-28-19:06:39 import
author Igor Sysoev <igor@sysoev.ru>
date Mon, 28 Apr 2003 15:06:39 +0000
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a7e45c45a95c nginx-0.0.1-2003-04-28-19:06:39 import
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1
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2
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3 typedef struct {
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4 int lock;
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5 } ngx_mutex_t;
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a7e45c45a95c nginx-0.0.1-2003-04-28-19:06:39 import
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8 static inline int ngx_spin_lock(ngx_mutex_t *m, int count)
a7e45c45a95c nginx-0.0.1-2003-04-28-19:06:39 import
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9 {
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10 int lock;
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11
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12 __asm__ __volatile("
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13
a7e45c45a95c nginx-0.0.1-2003-04-28-19:06:39 import
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14 get_lock:
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15 mov $1, %1
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16 xchg %1, %2
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17 cmp $0, %1
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18 jne spin_lock
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19
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20 spin_lock:
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21 cmp $0, %3
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22 je failed
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23
a7e45c45a95c nginx-0.0.1-2003-04-28-19:06:39 import
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24 dec %3
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25 rep nop
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26 cmp $0, %2
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27 jne spin_lock
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28
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29 ": "=q" (lock), "m" (m->lock), "q" (count));
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30 }