Mercurial > hg > nginx-quic
annotate src/core/ngx_spinlock.c @ 504:4cfdcb10967c
release-0.1.26 tag
author | Igor Sysoev <igor@sysoev.ru> |
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date | Tue, 22 Mar 2005 16:02:46 +0000 |
parents | 975f62e77f02 |
children | 9c2f3ed7a247 |
rev | line source |
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
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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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493 | 11 /* |
12 * TODO: the P4 optimized assembler version with the "pause" operation | |
13 */ | |
14 | |
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15 void ngx_spinlock(ngx_atomic_t *lock, ngx_uint_t spin) |
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16 { |
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17 |
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18 #if (NGX_HAVE_ATOMIC_OPS) |
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19 |
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20 ngx_uint_t tries; |
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21 |
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22 tries = 0; |
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23 |
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24 for ( ;; ) { |
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25 |
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26 if (*lock) { |
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27 if (ngx_ncpu > 1 && tries++ < spin) { |
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28 continue; |
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29 } |
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31 ngx_sched_yield(); |
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32 |
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33 tries = 0; |
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34 |
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35 } else { |
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36 if (ngx_atomic_cmp_set(lock, 0, 1)) { |
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37 return; |
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38 } |
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39 } |
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40 } |
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41 |
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42 #else |
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43 |
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44 #if (NGX_THREADS) |
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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 } |