Mercurial > hg > nginx-quic
annotate src/os/win32/ngx_atomic.h @ 4596:089cc5154c1e
IOV_MAX handling microoptimization.
We now stop on IOV_MAX iovec entries only if we are going to add new one,
i.e. next buffer can't be coalesced into last iovec.
This also fixes incorrect checks for trailer creation on FreeBSD and
Mac OS X, header.nelts was checked instead of trailer.nelts.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Tue, 17 Apr 2012 09:13:15 +0000 |
parents | d620f497c50f |
children | 3d2d3e1cf427 |
rev | line source |
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1 |
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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 #ifndef _NGX_ATOMIC_H_INCLUDED_ |
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9 #define _NGX_ATOMIC_H_INCLUDED_ |
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12 #include <ngx_config.h> |
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13 #include <ngx_core.h> |
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16 #define NGX_HAVE_ATOMIC_OPS 1 |
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17 |
561 | 18 typedef int32_t ngx_atomic_int_t; |
19 typedef uint32_t ngx_atomic_uint_t; | |
497 | 20 typedef volatile ngx_atomic_uint_t ngx_atomic_t; |
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21 #define NGX_ATOMIC_T_LEN (sizeof("-2147483648") - 1) |
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461 | 24 #if defined( __WATCOMC__ ) || defined( __BORLANDC__ ) || ( _MSC_VER >= 1300 ) |
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26 /* the new SDK headers */ |
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28 #define ngx_atomic_cmp_set(lock, old, set) \ |
581 | 29 ((ngx_atomic_uint_t) InterlockedCompareExchange((long *) lock, set, old) \ |
30 == old) | |
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32 #else |
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34 /* the old MS VC6.0SP2 SDK headers */ |
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36 #define ngx_atomic_cmp_set(lock, old, set) \ |
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37 (InterlockedCompareExchange((void **) lock, (void *) set, (void *) old) \ |
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38 == (void *) old) |
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40 #endif |
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42 |
561 | 43 #define ngx_atomic_fetch_add(p, add) InterlockedExchangeAdd((long *) p, add) |
44 | |
45 | |
563 | 46 #define ngx_memory_barrier() |
47 | |
48 | |
1193 | 49 #if defined( __BORLANDC__ ) || ( __WATCOMC__ < 1230 ) |
50 | |
51 /* | |
52 * Borland C++ 5.5 (tasm32) and Open Watcom C prior to 1.3 | |
53 * do not understand the "pause" instruction | |
54 */ | |
55 | |
611 | 56 #define ngx_cpu_pause() |
57 #else | |
58 #define ngx_cpu_pause() __asm { pause } | |
59 #endif | |
60 | |
61 | |
62 void ngx_spinlock(ngx_atomic_t *lock, ngx_atomic_int_t value, ngx_uint_t spin); | |
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64 #define ngx_trylock(lock) (*(lock) == 0 && ngx_atomic_cmp_set(lock, 0, 1)) |
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65 #define ngx_unlock(lock) *(lock) = 0 |
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66 |
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68 #endif /* _NGX_ATOMIC_H_INCLUDED_ */ |