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p2p: use atomic types (#27764)

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Co-authored-by: Felix Lange <fjl@twurst.com>
This commit is contained in:
ucwong 2023-08-01 22:20:52 +01:00 committed by GitHub
parent ff97b4cc6a
commit d04bde0a20
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1 changed files with 5 additions and 6 deletions
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11
p2p/message.go
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@ -156,7 +156,7 @@ func MsgPipe() (*MsgPipeRW, *MsgPipeRW) {
var ( var (
c1, c2 = make(chan Msg), make(chan Msg) c1, c2 = make(chan Msg), make(chan Msg)
closing = make(chan struct{}) closing = make(chan struct{})
closed = new(int32) closed = new(atomic.Bool)
rw1 = &MsgPipeRW{c1, c2, closing, closed} rw1 = &MsgPipeRW{c1, c2, closing, closed}
rw2 = &MsgPipeRW{c2, c1, closing, closed} rw2 = &MsgPipeRW{c2, c1, closing, closed}
) )
@ -172,13 +172,13 @@ type MsgPipeRW struct {
w chan<- Msg w chan<- Msg
r <-chan Msg r <-chan Msg
closing chan struct{} closing chan struct{}
closed *int32 closed *atomic.Bool
} }
// WriteMsg sends a message on the pipe. // WriteMsg sends a message on the pipe.
// It blocks until the receiver has consumed the message payload. // It blocks until the receiver has consumed the message payload.
func (p *MsgPipeRW) WriteMsg(msg Msg) error { func (p *MsgPipeRW) WriteMsg(msg Msg) error {
if atomic.LoadInt32(p.closed) == 0 { if !p.closed.Load() {
consumed := make(chan struct{}, 1) consumed := make(chan struct{}, 1)
msg.Payload = &eofSignal{msg.Payload, msg.Size, consumed} msg.Payload = &eofSignal{msg.Payload, msg.Size, consumed}
select { select {
@ -199,7 +199,7 @@ func (p *MsgPipeRW) WriteMsg(msg Msg) error {
// ReadMsg returns a message sent on the other end of the pipe. // ReadMsg returns a message sent on the other end of the pipe.
func (p *MsgPipeRW) ReadMsg() (Msg, error) { func (p *MsgPipeRW) ReadMsg() (Msg, error) {
if atomic.LoadInt32(p.closed) == 0 { if !p.closed.Load() {
select { select {
case msg := <-p.r: case msg := <-p.r:
return msg, nil return msg, nil
@ -213,9 +213,8 @@ func (p *MsgPipeRW) ReadMsg() (Msg, error) {
// of the pipe. They will return ErrPipeClosed. Close also // of the pipe. They will return ErrPipeClosed. Close also
// interrupts any reads from a message payload. // interrupts any reads from a message payload.
func (p *MsgPipeRW) Close() error { func (p *MsgPipeRW) Close() error {
if atomic.AddInt32(p.closed, 1) != 1 { if p.closed.Swap(true) {
// someone else is already closing // someone else is already closing
atomic.StoreInt32(p.closed, 1) // avoid overflow
return nil return nil
} }
close(p.closing) close(p.closing)