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runtime: convert sig.{state,delivering} to atomic type

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For #53821

Change-Id: I1c8df255ce9e2345d4fa45bd4d1761b73b9fa064
Reviewed-on: https://go-review.googlesource.com/c/go/+/425780
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
cuiweixie 2022-08-26 11:16:52 +08:00 committed by Michael Knyszek
parent a25a34abe9
commit d01200e772
1 changed files with 14 additions and 14 deletions
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28
src/runtime/sigqueue.go
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@ -54,8 +54,8 @@ var sig struct {
wanted [(_NSIG + 31) / 32]uint32
ignored [(_NSIG + 31) / 32]uint32
recv [(_NSIG + 31) / 32]uint32
state uint32
delivering uint32
state atomic.Uint32
delivering atomic.Uint32
inuse bool
}
@ -74,11 +74,11 @@ func sigsend(s uint32) bool {
return false
}
atomic.Xadd(&sig.delivering, 1)
sig.delivering.Add(1)
// We are running in the signal handler; defer is not available.
if w := atomic.Load(&sig.wanted[s/32]); w&bit == 0 {
atomic.Xadd(&sig.delivering, -1)
sig.delivering.Add(-1)
return false
}
@ -86,7 +86,7 @@ func sigsend(s uint32) bool {
for {
mask := sig.mask[s/32]
if mask&bit != 0 {
atomic.Xadd(&sig.delivering, -1)
sig.delivering.Add(-1)
return true // signal already in queue
}
if atomic.Cas(&sig.mask[s/32], mask, mask|bit) {
@ -97,18 +97,18 @@ func sigsend(s uint32) bool {
// Notify receiver that queue has new bit.
Send:
for {
switch atomic.Load(&sig.state) {
switch sig.state.Load() {
default:
throw("sigsend: inconsistent state")
case sigIdle:
if atomic.Cas(&sig.state, sigIdle, sigSending) {
if sig.state.CompareAndSwap(sigIdle, sigSending) {
break Send
}
case sigSending:
// notification already pending
break Send
case sigReceiving:
if atomic.Cas(&sig.state, sigReceiving, sigIdle) {
if sig.state.CompareAndSwap(sigReceiving, sigIdle) {
if GOOS == "darwin" || GOOS == "ios" {
sigNoteWakeup(&sig.note)
break Send
@ -119,7 +119,7 @@ Send:
}
}
atomic.Xadd(&sig.delivering, -1)
sig.delivering.Add(-1)
return true
}
@ -140,11 +140,11 @@ func signal_recv() uint32 {
// Wait for updates to be available from signal sender.
Receive:
for {
switch atomic.Load(&sig.state) {
switch sig.state.Load() {
default:
throw("signal_recv: inconsistent state")
case sigIdle:
if atomic.Cas(&sig.state, sigIdle, sigReceiving) {
if sig.state.CompareAndSwap(sigIdle, sigReceiving) {
if GOOS == "darwin" || GOOS == "ios" {
sigNoteSleep(&sig.note)
break Receive
@ -154,7 +154,7 @@ func signal_recv() uint32 {
break Receive
}
case sigSending:
if atomic.Cas(&sig.state, sigSending, sigIdle) {
if sig.state.CompareAndSwap(sigSending, sigIdle) {
break Receive
}
}
@ -182,14 +182,14 @@ func signalWaitUntilIdle() {
// a signal, has read from sig.wanted, is now updating sig.mask,
// and has not yet woken up the processor thread. We need to wait
// until all current signal deliveries have completed.
for atomic.Load(&sig.delivering) != 0 {
for sig.delivering.Load() != 0 {
Gosched()
}
// Although WaitUntilIdle seems like the right name for this
// function, the state we are looking for is sigReceiving, not
// sigIdle. The sigIdle state is really more like sigProcessing.
for atomic.Load(&sig.state) != sigReceiving {
for sig.state.Load() != sigReceiving {
Gosched()
}
}