Golang atomic.CompareAndSwapUint32函數代碼示例

func (client *_Client) doconnect() {
	if !atomic.CompareAndSwapUint32(&client.state, uint32(StateDisconnect), uint32(StateConnecting)) {
		return
	}

	go func() {
		conn, err := client.f()

		if err != nil {

			if !atomic.CompareAndSwapUint32(&client.state, uint32(StateConnecting), uint32(StateDisconnect)) {
				return
			}

			client.E("%s connect server error:%s", client.name, gserrors.New(err))

			if client.reconnectTimeout != 0 {

				time.AfterFunc(client.reconnectTimeout, func() {
					client.doconnect()
				})
			}

			return
		}

		client.connected(conn)

	}()
}

// ListenAndServe starts listening for connections, recording them and proxying
// to the target URL.
func (p *Proxy) ListenAndServe() (err error) {
	if atomic.CompareAndSwapUint32(&p.isrun, 0, 1) {
		defer func() {
			// Ignore "use of closed network connection" comming from closed
			// net.Listener when p was explicitely stopped.
			if !atomic.CompareAndSwapUint32(&p.isrun, 1, 0) {
				err = nil
			}
		}()
		p.m.Lock()
		var l net.Listener
		if l, err = net.Listen("tcp", p.addr); err != nil {
			p.m.Unlock()
			return
		}
		var src *net.TCPAddr
		src, err = urltotcpaddr(p.targ)
		if err != nil {
			p.m.Unlock()
			return
		}
		if p.rl, err = newRecListener(l, src, p.Record); err != nil {
			p.m.Unlock()
			return
		}
		p.wgr.Done()
		p.m.Unlock()
		err = p.srv.Serve(p.rl)
		return
	}
	return ErrAlreadyRunning
}

// 內部訪問接口
// 錯誤處理
func (chn *Channel) handleError(err error) {

	defer func() {
		if r := recover(); r != nil {
			mylog.GetErrorLogger().Println("Channel handleError Panic")
		}
	}()

	if err != nil {
		mylog.GetErrorLogger().Println("handleError", err.Error())
	}

	if atomic.CompareAndSwapUint32(&chn.valid, 0, 0) {
		return
	}

	atomic.CompareAndSwapUint32(&chn.valid, 1, 0)

	stat.GetLocalStatistInst().Off()

	func() {
		chn.resMutex.Lock()
		defer chn.resMutex.Unlock()
		for _, r := range chn.openRes {
			stat.GetLocalStatistInst().CloseRes()
			mylog.GetErrorLogger().Println(" release chn res ", r.GetID())
			clientDataID := new(ResourceClient)
			clientDataID.ClientInf = chn
			r.Close(clientDataID, "", true)
			ReleaseResourcer(r)
		}

		for _, v := range chn.registerRes {

			v.Unregister()
			ReleaseResourcer(v)
		}
	}()

	func() {

		fmt.Println("Chn Close")
		chn.chnMutex.Lock()
		defer chn.chnMutex.Unlock()
		chn.connSocket.Close()
		close(chn.rwChn)
		close(chn.notifyChn)
	}()

}

func (pu *PUDevice) handleError(err error) {
	mylog.GetErrorLogger().Println(err)
	if atomic.CompareAndSwapUint32(&pu.Valid, 0, 0) {
		return
	}

	atomic.CompareAndSwapUint32(&pu.Valid, 1, 0)
	pu.connSocket.Close()
	stat.GetLocalStatistInst().Off()
	if atomic.CompareAndSwapUint32(&pu.SendFlag, 1, 1) {
		stat.GetLocalStatistInst().CloseRes()
	}
	close(pu.rwChan)
	go pu.ReRun(pu.SN)
}

// Implements Service
func (bs *BaseService) Reset() (bool, error) {
	if atomic.CompareAndSwapUint32(&bs.stopped, 1, 0) {
		// whether or not we've started, we can reset
		atomic.CompareAndSwapUint32(&bs.started, 1, 0)

		return true, bs.impl.OnReset()
	} else {
		if bs.log != nil {
			bs.log.Debug(Fmt("Can't reset %v. Not stopped", bs.name), "impl", bs.impl)
		}
		return false, nil
	}
	// never happens
	return false, nil
}

func (a *AddrBook) Stop() {
	if atomic.CompareAndSwapUint32(&a.stopped, 0, 1) {
		log.Info("Stopping AddrBook")
		close(a.quit)
		a.wg.Wait()
	}
}

func (s *Stream) resetWith(errorCode frame.ErrorCode, resetErr error) {
	// only ever send one reset
	if !atomic.CompareAndSwapUint32(&s.sentRst, 0, 1) {
		return
	}

	// close the stream
	s.closeWithAndRemoveLater(resetErr)

	// make the reset frame
	rst := frame.NewWStreamRst()
	if err := rst.Set(s.id, errorCode); err != nil {
		s.die(frame.InternalError, err)
	}

	// need write lock to make sure no data frames get sent after we send the reset
	s.writer.Lock()

	// send it
	if err := s.session.writeFrame(rst, zeroTime); err != nil {
		s.writer.Unlock()
		s.die(frame.InternalError, err)
	}

	s.writer.Unlock()
}

// OpenStream is used to create a new stream
func (s *Session) OpenStream() (*Stream, error) {
	if s.IsClosed() {
		return nil, ErrSessionShutdown
	}
	if atomic.LoadInt32(&s.remoteGoAway) == 1 {
		return nil, ErrRemoteGoAway
	}

GET_ID:
	// Get and ID, and check for stream exhaustion
	id := atomic.LoadUint32(&s.nextStreamID)
	if id >= math.MaxUint32-1 {
		return nil, ErrStreamsExhausted
	}
	if !atomic.CompareAndSwapUint32(&s.nextStreamID, id, id+2) {
		goto GET_ID
	}

	// Register the stream
	stream := newStream(s, id, streamInit)
	s.streamLock.Lock()
	s.streams[id] = stream
	s.streamLock.Unlock()

	// Send the window update to create
	return stream, stream.sendWindowUpdate()
}

func (c *ConcurrentSolver) attrHelper(G *graphs.Graph, removed []bool, tmpMap []int32, flags []uint32, ch chan int, i int, node int, wg *sync.WaitGroup) {
	for _, v0 := range G.Nodes[node].Inc {
		if !removed[v0] {
			flag := G.Nodes[v0].Player == i
			if atomic.CompareAndSwapUint32(&flags[v0], 0, 1) {
				if flag {
					ch <- v0
					atomic.AddInt32(&tmpMap[v0], 1)
				} else {
					adj_counter := 0
					for _, x := range G.Nodes[v0].Adj {
						if !removed[x] {
							adj_counter += 1
						}
					}
					atomic.AddInt32(&tmpMap[v0], int32(adj_counter))
					if adj_counter == 1 {
						ch <- v0
					}
				}
			} else if !flag {
				if atomic.AddInt32(&tmpMap[v0], -1) == 1 {
					ch <- v0
				}
			}
		}
	}
	wg.Done()
}

func (o *emptyObject) Release() {
	if !atomic.CompareAndSwapUint32(&o.once, 0, 1) {
		return
	}
	o.node.evict()
	o.node = nil
}

// Implements Reactor
func (bcR *BlockchainReactor) Stop() {
	if atomic.CompareAndSwapUint32(&bcR.running, 1, 0) {
		log.Info("Stopping BlockchainReactor")
		close(bcR.quit)
		bcR.pool.Stop()
	}
}

// Resume resumes a TBucket in a paused state and begins adding new tokens to
// the bucket again.
//
// Resume returns true if the TBucket has been resumed, or false if the TBucket
// is not in a paused state.
func (tb *TBucket) Resume() bool {
	if tb.IsClosed() || !atomic.CompareAndSwapUint32(&tb.paused, 1, 0) {
		return false
	}
	tb.prch <- struct{}{}
	return true
}

// Close stops the internal ticker that adds tokens. The TBucket instance is now
// permanently closed and cannpt be reopened. When the TBucket will no longer be
// used, this function must be called to stop the internal timer from continuing
// to fire.
//
// It returns true if the TBucket has been closed, or false if the TBucket has
// already been closed.
func (tb *TBucket) Close() bool {
	if !atomic.CompareAndSwapUint32(&tb.closed, 0, 1) {
		return false
	}
	tb.cch <- struct{}{}
	return true
}

func (p *Proxy) Close() error {
	if atomic.CompareAndSwapUint32(&p.closed, 0, 1) {
		return p.listener.Close()
	}

	return nil
}

func (dc *DatabaseContext) TakeDbOffline(reason string) error {
	base.LogTo("CRUD", "Taking Database : %v, offline", dc.Name)
	dbState := atomic.LoadUint32(&dc.State)
	//If the DB is already trasitioning to: offline or is offline silently return
	if dbState == DBOffline || dbState == DBResyncing || dbState == DBStopping {
		return nil
	}

	if atomic.CompareAndSwapUint32(&dc.State, DBOnline, DBStopping) {

		//notify all active _changes feeds to close
		close(dc.ExitChanges)

		base.LogTo("CRUD", "Waiting for all active calls to complete on Database : %v", dc.Name)
		//Block until all current calls have returned, including _changes feeds
		dc.AccessLock.Lock()
		defer dc.AccessLock.Unlock()

		base.LogTo("CRUD", "Database : %v, is offline", dc.Name)
		//set DB state to Offline
		atomic.StoreUint32(&dc.State, DBOffline)

		if dc.EventMgr.HasHandlerForEvent(DBStateChange) {
			dc.EventMgr.RaiseDBStateChangeEvent(dc.Name, "offline", reason, *dc.Options.AdminInterface)
		}

		return nil
	} else {
		base.LogTo("CRUD", "Unable to take Database offline, database must be in Online state")
		return base.HTTPErrorf(http.StatusServiceUnavailable, "Unable to take Database offline, database must be in Online state")
	}
}