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Annotation of embedaddon/nginx/src/os/unix/ngx_gcc_atomic_sparc64.h, revision 1.1

1.1     ! misho       1: 
        !             2: /*
        !             3:  * Copyright (C) Igor Sysoev
        !             4:  * Copyright (C) Nginx, Inc.
        !             5:  */
        !             6: 
        !             7: 
        !             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:  */
        !            24: 
        !            25: 
        !            26: #if (NGX_PTR_SIZE == 4)
        !            27: #define NGX_CASA  "casa"
        !            28: #else
        !            29: #define NGX_CASA  "casxa"
        !            30: #endif
        !            31: 
        !            32: 
        !            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 (
        !            38: 
        !            39:     NGX_CASA " [%1] 0x80, %2, %0"
        !            40: 
        !            41:     : "+r" (set) : "r" (lock), "r" (old) : "memory");
        !            42: 
        !            43:     return (set == old);
        !            44: }
        !            45: 
        !            46: 
        !            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;
        !            51: 
        !            52:     old = *value;
        !            53: 
        !            54:     for ( ;; ) {
        !            55: 
        !            56:         res = old + add;
        !            57: 
        !            58:         __asm__ volatile (
        !            59: 
        !            60:         NGX_CASA " [%1] 0x80, %2, %0"
        !            61: 
        !            62:         : "+r" (res) : "r" (value), "r" (old) : "memory");
        !            63: 
        !            64:         if (res == old) {
        !            65:             return res;
        !            66:         }
        !            67: 
        !            68:         old = res;
        !            69:     }
        !            70: }
        !            71: 
        !            72: 
        !            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
        !            81: 
        !            82: #define ngx_cpu_pause()