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sync/atomic: update comment for ARM 64-bit atomics

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They don't work on older chips, just like the x86-32 64-bit atomics.

Update #6134

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/12880043
This commit is contained in:
Russ Cox 2013-08-13 16:16:05 -04:00
parent 74e78df107
commit 2642c6e24d
1 changed files with 2 additions and 0 deletions
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src/pkg/sync/atomic/doc.go
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@ -47,6 +47,8 @@ import (
// BUG(rsc): On x86-32, the 64-bit functions use instructions unavailable before the Pentium MMX.
//
// On non-Linux ARM, the 64-bit functions use instructions unavailable before the ARMv6k core.
//
// 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