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annotate src/os/win32/ngx_atomic.h @ 5360:3d2d3e1cf427

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Win32: MinGW GCC compatibility. Several warnings silenced, notably (ngx_socket_t) -1 is now checked on socket operations instead of -1, as ngx_socket_t is unsigned on win32 and gcc complains on comparison. With this patch, it's now possible to compile nginx using mingw gcc, with options we normally compile on win32.
author Maxim Dounin <mdounin@mdounin.ru>
date Wed, 04 Sep 2013 20:48:28 +0400
parents d620f497c50f
children 2cd019520210
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2 /*
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3 * Copyright (C) Igor Sysoev
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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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18 typedef int32_t ngx_atomic_int_t;
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19 typedef uint32_t ngx_atomic_uint_t;
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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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23
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24 #if defined( __WATCOMC__ ) || defined( __BORLANDC__ ) || defined(__GNUC__) \
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25 || ( _MSC_VER >= 1300 )
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27 /* the new SDK headers */
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29 #define ngx_atomic_cmp_set(lock, old, set) \
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30 ((ngx_atomic_uint_t) InterlockedCompareExchange((long *) lock, set, old) \
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31 == old)
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33 #else
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34
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35 /* the old MS VC6.0SP2 SDK headers */
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37 #define ngx_atomic_cmp_set(lock, old, set) \
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38 (InterlockedCompareExchange((void **) lock, (void *) set, (void *) old) \
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39 == (void *) old)
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41 #endif
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44 #define ngx_atomic_fetch_add(p, add) InterlockedExchangeAdd((long *) p, add)
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47 #define ngx_memory_barrier()
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49
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50 #if defined( __BORLANDC__ ) || ( __WATCOMC__ < 1230 )
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52 /*
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53 * Borland C++ 5.5 (tasm32) and Open Watcom C prior to 1.3
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54 * do not understand the "pause" instruction
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55 */
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57 #define ngx_cpu_pause()
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58 #else
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59 #define ngx_cpu_pause() __asm { pause }
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60 #endif
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63 void ngx_spinlock(ngx_atomic_t *lock, ngx_atomic_int_t value, ngx_uint_t spin);
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65 #define ngx_trylock(lock) (*(lock) == 0 && ngx_atomic_cmp_set(lock, 0, 1))
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66 #define ngx_unlock(lock) *(lock) = 0
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69 #endif /* _NGX_ATOMIC_H_INCLUDED_ */