Mercurial > hg > nginx
annotate src/core/ngx_spinlock.c @ 1508:bd5623467ad0 stable-0.5
r1394 merge:
rename upgrade to upgrade1
use -QUIT instead of -WINCH
author | Igor Sysoev <igor@sysoev.ru> |
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date | Sat, 22 Sep 2007 19:06:46 +0000 |
parents | 3f8a2132b93d |
children | d620f497c50f |
rev | line source |
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
441
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4 */ |
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7 #include <ngx_config.h> |
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8 #include <ngx_core.h> |
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10 |
563 | 11 void |
611 | 12 ngx_spinlock(ngx_atomic_t *lock, ngx_atomic_int_t value, ngx_uint_t spin) |
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13 { |
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15 #if (NGX_HAVE_ATOMIC_OPS) |
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611 | 17 ngx_uint_t i, n; |
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18 |
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19 for ( ;; ) { |
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20 |
611 | 21 if (*lock == 0 && ngx_atomic_cmp_set(lock, 0, value)) { |
22 return; | |
23 } | |
24 | |
25 if (ngx_ncpu > 1) { | |
26 | |
27 for (n = 1; n < spin; n <<= 1) { | |
363
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28 |
611 | 29 for (i = 0; i < n; i++) { |
30 ngx_cpu_pause(); | |
31 } | |
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32 |
611 | 33 if (*lock == 0 && ngx_atomic_cmp_set(lock, 0, value)) { |
34 return; | |
35 } | |
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36 } |
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37 } |
611 | 38 |
39 ngx_sched_yield(); | |
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40 } |
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41 |
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42 #else |
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44 #if (NGX_THREADS) |
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45 |
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46 #error ngx_spinlock() or ngx_atomic_cmp_set() are not defined ! |
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47 |
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48 #endif |
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49 |
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50 #endif |
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51 |
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52 } |