diff options
| author | Ondřej Surý <ondrej@sury.org> | 2011-04-20 15:44:41 +0200 |
|---|---|---|
| committer | Ondřej Surý <ondrej@sury.org> | 2011-04-20 15:44:41 +0200 |
| commit | 50104cc32a498f7517a51c8dc93106c51c7a54b4 (patch) | |
| tree | 47af80be259cc7c45d0eaec7d42e61fa38c8e4fb /src/pkg/runtime/amd64/asm.s | |
| parent | c072558b90f1bbedc2022b0f30c8b1ac4712538e (diff) | |
| download | golang-upstream/2011.03.07.1.tar.gz | |
Imported Upstream version 2011.03.07.1upstream/2011.03.07.1
Diffstat (limited to 'src/pkg/runtime/amd64/asm.s')
| -rw-r--r-- | src/pkg/runtime/amd64/asm.s | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/src/pkg/runtime/amd64/asm.s b/src/pkg/runtime/amd64/asm.s index b6642c13c..cc05435f7 100644 --- a/src/pkg/runtime/amd64/asm.s +++ b/src/pkg/runtime/amd64/asm.s @@ -317,6 +317,26 @@ TEXT runtime·cas(SB), 7, $0 MOVL $1, AX RET +// bool casp(void **val, void *old, void *new) +// Atomically: +// if(*val == old){ +// *val = new; +// return 1; +// } else +// return 0; +TEXT runtime·casp(SB), 7, $0 + MOVQ 8(SP), BX + MOVQ 16(SP), AX + MOVQ 24(SP), CX + LOCK + CMPXCHGQ CX, 0(BX) + JZ 3(PC) + MOVL $0, AX + RET + MOVL $1, AX + RET + + // void jmpdefer(fn, sp); // called from deferreturn. // 1. pop the caller |