diff options
| author | Michael Stapelberg <michael@stapelberg.de> | 2013-03-23 11:28:53 +0100 |
|---|---|---|
| committer | Michael Stapelberg <michael@stapelberg.de> | 2013-03-23 11:28:53 +0100 |
| commit | b39e15dde5ec7b96c15da9faf4ab5892501c1aae (patch) | |
| tree | 718cede1f6ca97d082c6c40b7dc3f4f6148253c0 /src/pkg/runtime/atomic_386.c | |
| parent | 04b08da9af0c450d645ab7389d1467308cfc2db8 (diff) | |
| download | golang-upstream/1.1_hg20130323.tar.gz | |
Imported Upstream version 1.1~hg20130323upstream/1.1_hg20130323
Diffstat (limited to 'src/pkg/runtime/atomic_386.c')
| -rw-r--r-- | src/pkg/runtime/atomic_386.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/src/pkg/runtime/atomic_386.c b/src/pkg/runtime/atomic_386.c index 79b7cbf96..1046eb81e 100644 --- a/src/pkg/runtime/atomic_386.c +++ b/src/pkg/runtime/atomic_386.c @@ -30,3 +30,16 @@ runtime·xadd64(uint64 volatile* addr, int64 v) } return old+v; } + +#pragma textflag 7 +uint64 +runtime·xchg64(uint64 volatile* addr, uint64 v) +{ + uint64 old; + + old = *addr; + while(!runtime·cas64(addr, &old, v)) { + // nothing + } + return old; +} |