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sync/atomic: document that users must deal with 64-bit alignment

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Update #599.

R=dvyukov, iant, minux.ma
CC=golang-dev
https://golang.org/cl/7001056
This commit is contained in:
Russ Cox 2013-01-02 15:44:00 -05:00
parent 20c76f7f3f
commit 64a0017d6e
1 changed files with 5 additions and 2 deletions
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7
src/pkg/sync/atomic/doc.go
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@ -38,9 +38,12 @@ import (
"unsafe" "unsafe"
) )
// BUG(rsc): On ARM, the 64-bit functions use instructions unavailable before ARM 11. // BUG(rsc): On x86-32, the 64-bit functions use instructions unavailable before the Pentium MMX.
// //
// On x86-32, the 64-bit functions use instructions unavailable before the Pentium MMX. // On both ARM and x86-32, it is the caller's responsibility to arrange for 64-bit
// alignment of 64-bit words accessed atomically. The first word in a global
// variable or in an allocated struct or slice can be relied upon to be
// 64-bit aligned.
// CompareAndSwapInt32 executes the compare-and-swap operation for an int32 value. // CompareAndSwapInt32 executes the compare-and-swap operation for an int32 value.
func CompareAndSwapInt32(addr *int32, old, new int32) (swapped bool) func CompareAndSwapInt32(addr *int32, old, new int32) (swapped bool)