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| author | Russ Cox <rsc@golang.org> | 2014-11-11 17:07:54 -0500 |
|---|---|---|
| committer | Russ Cox <rsc@golang.org> | 2014-11-11 17:07:54 -0500 |
| commit | ece09790afb822fed2bd2e8ac3a803e5ccbb8e3a (patch) | |
| tree | 299d51628d4e8884dab448301320dee91ad20d54 /src/runtime/lfstack_amd64.go | |
| parent | 580ef3e4afe6e31f21e21d3d0919d8a033071320 (diff) | |
| download | go-ece09790afb822fed2bd2e8ac3a803e5ccbb8e3a.tar.xz | |
[dev.cc] runtime: convert parallel support code from C to Go
The conversion was done with an automated tool and then
modified only as necessary to make it compile and run.
[This CL is part of the removal of C code from package runtime.
See golang.org/s/dev.cc for an overview.]
LGTM=r
R=r, austin
CC=dvyukov, golang-codereviews, iant, khr
https://golang.org/cl/172250043
Diffstat (limited to 'src/runtime/lfstack_amd64.go')
| -rw-r--r-- | src/runtime/lfstack_amd64.go | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/runtime/lfstack_amd64.go b/src/runtime/lfstack_amd64.go new file mode 100644 index 0000000000..1245557819 --- /dev/null +++ b/src/runtime/lfstack_amd64.go @@ -0,0 +1,12 @@ +// Copyright 2014 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. + +package runtime + +// Amd64 uses 48-bit virtual addresses, 47-th bit is used as kernel/user flag. +// So we use 17msb of pointers as ABA counter. +const ( + lfPtrBits = 47 + lfCountMask = 1<<17 - 1 +) |