| / |
| / 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 |
