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1 /
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2 / Copyright (C) Igor Sysoev
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3 / Copyright (C) Nginx, Inc.
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4 /
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5
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6 / ngx_atomic_uint_t ngx_atomic_cmp_set(ngx_atomic_t *lock,
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7 / ngx_atomic_uint_t old, ngx_atomic_uint_t set);
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8 /
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9 / the arguments are passed in %rdi, %rsi, %rdx
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10 / the result is returned in the %rax
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11
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12 .inline ngx_atomic_cmp_set,0
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13 movq %rsi, %rax
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14 lock
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15 cmpxchgq %rdx, (%rdi)
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16 setz %al
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17 movzbq %al, %rax
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18 .end
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19
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20
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21 / ngx_atomic_int_t ngx_atomic_fetch_add(ngx_atomic_t *value,
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22 / ngx_atomic_int_t add);
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23 /
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24 / the arguments are passed in %rdi, %rsi
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25 / the result is returned in the %rax
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26
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27 .inline ngx_atomic_fetch_add,0
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28 movq %rsi, %rax
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29 lock
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30 xaddq %rax, (%rdi)
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31 .end
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32
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33
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34 / ngx_cpu_pause()
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35 /
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36 / the "rep; nop" is used instead of "pause" to avoid the "[ PAUSE ]" hardware
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37 / capability added by linker because Solaris/amd64 does not know about it:
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38 /
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39 / ld.so.1: nginx: fatal: hardware capability unsupported: 0x2000 [ PAUSE ]
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40
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41 .inline ngx_cpu_pause,0
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42 rep; nop
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43 .end
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