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src/os/unix/ngx_gcc_atomic_sparc64.h - nginx-1.7.10

Functions defined

Macros defined

Source code


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


  8. /*
  9. * "casa   [r1] 0x80, r2, r0"  and
  10. * "casxa  [r1] 0x80, r2, r0"  do the following:
  11. *
  12. *     if ([r1] == r2) {
  13. *         swap(r0, [r1]);
  14. *     } else {
  15. *         r0 = [r1];
  16. *     }
  17. *
  18. * so "r0 == r2" means that the operation was successful.
  19. *
  20. *
  21. * The "r" means the general register.
  22. * The "+r" means the general register used for both input and output.
  23. */


  26. #if (NGX_PTR_SIZE == 4)
  27. ‌#define NGX_CASA  "casa"
  28. #else
  29. ‌#define NGX_CASA  "casxa"
  30. #endif


  33. static ngx_inline ngx_atomic_uint_t
  34. ‌ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old,
  35.     ngx_atomic_uint_t set)
  36. {
  37.     __asm__ volatile (

  39.     NGX_CASA " [%1] 0x80, %2, %0"

  41.     : "+r" (set) : "r" (lock), "r" (old) : "memory");

  43.     return (set == old);
  44. }


  47. static ngx_inline ngx_atomic_int_t
  48. ‌ngx_atomic_fetch_add(ngx_atomic_t *value, ngx_atomic_int_t add)
  49. {
  50.     ngx_atomic_uint_t  old, res;

  52.     old = *value;

  54.     for ( ;; ) {

  56.         res = old + add;

  58.         __asm__ volatile (

  60.         NGX_CASA " [%1] 0x80, %2, %0"

  62.         : "+r" (res) : "r" (value), "r" (old) : "memory");

  64.         if (res == old) {
  65.             return res;
  66.         }

  68.         old = res;
  69.     }
  70. }


  73. #if (NGX_SMP)
  74. ‌#define ngx_memory_barrier()                                                  \
  75.             __asm__ volatile (                                                \
  76.             "membar #LoadLoad | #LoadStore | #StoreStore | #StoreLoad"        \
  77.             ::: "memory")
  78. #else
  79. ‌#define ngx_memory_barrier()   __asm__ volatile ("" ::: "memory")
  80. #endif

  82. ‌#define ngx_cpu_pause()

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