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annotate src/event/ngx_event_spinlock.c @ 363:f2755a2885c8

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nginx-0.0.7-2004-06-21-23:22:53 import
author Igor Sysoev <igor@sysoev.ru>
date Mon, 21 Jun 2004 19:22:53 +0000
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f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
Igor Sysoev <igor@sysoev.ru>
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f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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3 void _spinlock(ngx_atomic_t *lock)
f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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4 {
f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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5 ngx_int_t tries;
f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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7 tries = 0;
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f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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9 for ( ;; ) {
f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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11 if (*lock) {
f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
Igor Sysoev <igor@sysoev.ru>
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12 if (ngx_ncpu > 1 && tries++ < 1000) {
f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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13 continue;
f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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14 }
f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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16 sched_yield();
f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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17 tries = 0;
f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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19 } else {
f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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20 if (ngx_atomic_cmp_set(lock, 0, 1)) {
f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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21 return;
f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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22 }
f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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23 }
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24 }
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25 }
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