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/
/ Copyright (C) Igor Sysoev
/ Copyright (C) Nginx, Inc.
/
/ ngx_atomic_uint_t ngx_atomic_cmp_set(ngx_atomic_t *lock,
/ ngx_atomic_uint_t old, ngx_atomic_uint_t set);
/
/ the arguments are passed in %rdi, %rsi, %rdx
/ the result is returned in the %rax
.inline ngx_atomic_cmp_set,0
movq %rsi, %rax
lock
cmpxchgq %rdx, (%rdi)
setz %al
movzbq %al, %rax
.end
/ ngx_atomic_int_t ngx_atomic_fetch_add(ngx_atomic_t *value,
/ ngx_atomic_int_t add);
/
/ the arguments are passed in %rdi, %rsi
/ the result is returned in the %rax
.inline ngx_atomic_fetch_add,0
movq %rsi, %rax
lock
xaddq %rax, (%rdi)
.end
/ ngx_cpu_pause()
/
/ the "rep; nop" is used instead of "pause" to avoid the "[ PAUSE ]" hardware
/ capability added by linker because Solaris/amd64 does not know about it:
/
/ ld.so.1: nginx: fatal: hardware capability unsupported: 0x2000 [ PAUSE ]
.inline ngx_cpu_pause,0
rep; nop
.end
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