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runtime: break atomics out into package runtime/internal/atomic

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This change breaks out most of the atomics functions in the runtime
into package runtime/internal/atomic. It adds some basic support
in the toolchain for runtime packages, and also modifies linux/arm
atomics to remove the dependency on the runtime's mutex. The mutexes
have been replaced with spinlocks.

all trybots are happy!
In addition to the trybots, I've tested on the darwin/arm64 builder,
on the darwin/arm builder, and on a ppc64le machine.

Change-Id: I6698c8e3cf3834f55ce5824059f44d00dc8e3c2f
Reviewed-on: https://go-review.googlesource.com/14204
Run-TryBot: Michael Matloob <matloob@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
This commit is contained in:
Michael Matloob 2015-11-02 14:09:24 -05:00
parent d33360571f
commit 67faca7d9c
94 changed files with 2302 additions and 1940 deletions
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21
src/runtime/sigqueue.go
View file

@ -28,7 +28,10 @@
package runtime
import "unsafe"
import (
"runtime/internal/atomic"
"unsafe"
)
var sig struct {
note note
@ -59,7 +62,7 @@ func sigsend(s uint32) bool {
if mask&bit != 0 {
return true // signal already in queue
}
if cas(&sig.mask[s/32], mask, mask|bit) {
if atomic.Cas(&sig.mask[s/32], mask, mask|bit) {
break
}
}
@ -67,18 +70,18 @@ func sigsend(s uint32) bool {
// Notify receiver that queue has new bit.
Send:
for {
switch atomicload(&sig.state) {
switch atomic.Load(&sig.state) {
default:
throw("sigsend: inconsistent state")
case sigIdle:
if cas(&sig.state, sigIdle, sigSending) {
if atomic.Cas(&sig.state, sigIdle, sigSending) {
break Send
}
case sigSending:
// notification already pending
break Send
case sigReceiving:
if cas(&sig.state, sigReceiving, sigIdle) {
if atomic.Cas(&sig.state, sigReceiving, sigIdle) {
notewakeup(&sig.note)
break Send
}
@ -104,17 +107,17 @@ func signal_recv() uint32 {
// Wait for updates to be available from signal sender.
Receive:
for {
switch atomicload(&sig.state) {
switch atomic.Load(&sig.state) {
default:
throw("signal_recv: inconsistent state")
case sigIdle:
if cas(&sig.state, sigIdle, sigReceiving) {
if atomic.Cas(&sig.state, sigIdle, sigReceiving) {
notetsleepg(&sig.note, -1)
noteclear(&sig.note)
break Receive
}
case sigSending:
if cas(&sig.state, sigSending, sigIdle) {
if atomic.Cas(&sig.state, sigSending, sigIdle) {
break Receive
}
}
@ -122,7 +125,7 @@ func signal_recv() uint32 {
// Incorporate updates from sender into local copy.
for i := range sig.mask {
sig.recv[i] = xchg(&sig.mask[i], 0)
sig.recv[i] = atomic.Xchg(&sig.mask[i], 0)
}
}
}