Mercurial > hg > nginx-quic
annotate src/core/ngx_spinlock.c @ 4159:718f2154b813 stable-1.0
Merging r3933, r4154:
A new fix for the case when ssl_session_cache defined, but ssl is not
enabled in any server. The previous r1033 does not help when unused zone
becomes used after reconfiguration, so it is backed out.
The initial thought was to make SSL modules independed from SSL implementation
and to keep OpenSSL code dependance as much as in separate files.
author | Igor Sysoev <igor@sysoev.ru> |
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date | Fri, 30 Sep 2011 13:36:33 +0000 |
parents | 3f8a2132b93d |
children | d620f497c50f |
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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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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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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) { | |
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611 | 29 for (i = 0; i < n; i++) { |
30 ngx_cpu_pause(); | |
31 } | |
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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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46 #error ngx_spinlock() or ngx_atomic_cmp_set() are not defined ! |
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48 #endif |
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50 #endif |
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52 } |