Mercurial > hg > nginx-quic
annotate src/core/ngx_spinlock.c @ 6794:93b294c5d581
Upstream: avoid holding a cache node with upgraded connections.
Holding a cache node lock doesn't make sense as we can't use caching
anyway, and results in "ignore long locked inactive cache entry" alerts
if a node is locked for a long time.
The same is done for unbuffered connections, as they can be alive for
a long time as well.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Thu, 03 Nov 2016 17:09:32 +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. |
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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) |
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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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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 } | |
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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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Core: guard against spinlock usage without atomic ops.
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45 #if (NGX_THREADS) |
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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 } |