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| author | Russ Cox <rsc@golang.org> | 2009-06-02 23:22:12 -0700 |
|---|---|---|
| committer | Russ Cox <rsc@golang.org> | 2009-06-02 23:22:12 -0700 |
| commit | 73c10dd96785c02d8e02f46ec79c1f3e9f1b34e9 (patch) | |
| tree | 458fc0ea6921dc3405cdc5b09560d3db6977a22e /src/lib/sync | |
| parent | f1f970ad212dc096bb0d4dd959ec9e90489c0499 (diff) | |
| download | go-73c10dd96785c02d8e02f46ec79c1f3e9f1b34e9.tar.xz | |
386 library updates
R=r
DELTA=161 (153 added, 0 deleted, 8 changed)
OCL=29802
CL=29809
Diffstat (limited to 'src/lib/sync')
| -rw-r--r-- | src/lib/sync/asm_386.s | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/src/lib/sync/asm_386.s b/src/lib/sync/asm_386.s new file mode 100644 index 0000000000..f71182b753 --- /dev/null +++ b/src/lib/sync/asm_386.s @@ -0,0 +1,23 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// func cas(val *int32, old, new int32) bool +// Atomically: +// if *val == old { +// *val = new; +// return true; +// }else +// return false; +TEXT sync·cas(SB), 7, $0 + MOVL 4(SP), BX + MOVL 8(SP), AX + MOVL 12(SP), CX + LOCK + CMPXCHGL CX, 0(BX) + JZ ok + MOVL $0, 16(SP) + RET +ok: + MOVL $1, 16(SP) + RET |