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src/os/win32/ngx_atomic.h - nginx source code

Data types defined

Macros defined

Source code


  2. /*
  3. * Copyright (C) Igor Sysoev
  4. * Copyright (C) Nginx, Inc.
  5. */


  8. #ifndef _NGX_ATOMIC_H_INCLUDED_
  9. ‌#define _NGX_ATOMIC_H_INCLUDED_


  12. #include <ngx_config.h>
  13. #include <ngx_core.h>


  16. ‌#define NGX_HAVE_ATOMIC_OPS   1

  18. ‌typedef int32_t                     ngx_atomic_int_t;
  19. ‌typedef uint32_t                    ngx_atomic_uint_t;
  20. ‌typedef volatile ngx_atomic_uint_t  ngx_atomic_t;
  21. ‌#define NGX_ATOMIC_T_LEN            (sizeof("-2147483648") - 1)


  24. #if defined( __WATCOMC__ ) || defined( __BORLANDC__ ) || defined(__GNUC__)    \
  25.     || ( _MSC_VER >= 1300 )

  27. /* the new SDK headers */

  29. ‌#define ngx_atomic_cmp_set(lock, old, set)                                    \
  30.     ((ngx_atomic_uint_t) InterlockedCompareExchange((long *) lock, set, old)  \
  31.                          == old)

  33. #else

  35. /* the old MS VC6.0SP2 SDK headers */

  37. ‌#define ngx_atomic_cmp_set(lock, old, set)                                    \
  38.     (InterlockedCompareExchange((void **) lock, (void *) set, (void *) old)   \
  39.      == (void *) old)

  41. #endif


  44. ‌#define ngx_atomic_fetch_add(p, add) InterlockedExchangeAdd((long *) p, add)


  47. ‌#define ngx_memory_barrier()


  50. #if defined( __BORLANDC__ ) || ( __WATCOMC__ < 1230 )

  52. /*
  53. * Borland C++ 5.5 (tasm32) and Open Watcom C prior to 1.3
  54. * do not understand the "pause" instruction
  55. */

  57. ‌#define ngx_cpu_pause()
  58. #else
  59. ‌#define ngx_cpu_pause()       __asm { pause }
  60. #endif


  63. void ngx_spinlock(ngx_atomic_t *lock, ngx_atomic_int_t value, ngx_uint_t spin);

  65. ‌#define ngx_trylock(lock)  (*(lock) == 0 && ngx_atomic_cmp_set(lock, 0, 1))
  66. ‌#define ngx_unlock(lock)    *(lock) = 0


  69. #endif /* _NGX_ATOMIC_H_INCLUDED_ */

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