Mercurial > hg > nginx
annotate src/core/ngx_spinlock.c @ 8777:d5f93733c17d quic
QUIC: relaxed client id requirements.
Client IDs cannot be reused on different paths. This change allows to reuse
client id previosly seen on the same path (but with different dcid) in case
when no unused client IDs are available.
author | Vladimir Homutov <vl@nginx.com> |
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date | Wed, 05 May 2021 18:11:55 +0300 |
parents | f737e406aa68 |
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rev | line source |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
441
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5 */ |
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8 #include <ngx_config.h> |
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9 #include <ngx_core.h> |
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11 |
563 | 12 void |
611 | 13 ngx_spinlock(ngx_atomic_t *lock, ngx_atomic_int_t value, ngx_uint_t spin) |
363
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14 { |
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16 #if (NGX_HAVE_ATOMIC_OPS) |
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611 | 18 ngx_uint_t i, n; |
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19 |
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20 for ( ;; ) { |
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21 |
611 | 22 if (*lock == 0 && ngx_atomic_cmp_set(lock, 0, value)) { |
23 return; | |
24 } | |
25 | |
26 if (ngx_ncpu > 1) { | |
27 | |
28 for (n = 1; n < spin; n <<= 1) { | |
363
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29 |
611 | 30 for (i = 0; i < n; i++) { |
31 ngx_cpu_pause(); | |
32 } | |
363
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33 |
611 | 34 if (*lock == 0 && ngx_atomic_cmp_set(lock, 0, value)) { |
35 return; | |
36 } | |
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37 } |
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38 } |
611 | 39 |
40 ngx_sched_yield(); | |
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41 } |
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42 |
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43 #else |
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44 |
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45 #if (NGX_THREADS) |
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46 |
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47 #error ngx_spinlock() or ngx_atomic_cmp_set() are not defined ! |
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48 |
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49 #endif |
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51 #endif |
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53 } |