Golang atomic.StoreUint64函數代碼示例

func bpsLoop(ch <-chan Report, dst *uint64) {
	l := list.New()

	for {
		var tch <-chan time.Time

		// Setup timer for front of list to become stale.
		if e := l.Front(); e != nil {
			dt := time.Second - time.Now().Sub(e.Value.(readerReport).t)
			tch = time.After(dt)
		}

		select {
		case q, ok := <-ch:
			if !ok {
				return
			}

			l.PushBack(q)
		case <-tch:
			l.Remove(l.Front())
		}

		// Compute new bps
		if l.Len() == 0 {
			atomic.StoreUint64(dst, 0)
		} else {
			f := l.Front().Value.(readerReport)
			b := l.Back().Value.(readerReport)
			atomic.StoreUint64(dst, uint64(b.pos-f.pos))
		}
	}
}

func read(r io.ReadCloser, lines chan<- string) {
	var drops uint64 = 0
	var reads uint64 = 0
	go func() {
		for _ = range time.Tick(time.Second) {
			d := atomic.LoadUint64(&drops)
			r := atomic.LoadUint64(&reads)
			atomic.StoreUint64(&drops, 0)
			atomic.StoreUint64(&reads, 0)
			fmt.Fprintf(os.Stdout, "reads=%d drops=%d\n", r, d)
		}
	}()
	rdr := bufio.NewReader(r)
	for {
		line, err := rdr.ReadString('\n')
		//Drop the line if the lines buffer is full.
		//Set buffSize to reduce drops.
		if err == nil {
			select {
			case lines <- line:
				atomic.AddUint64(&reads, 1)
			default:
				atomic.AddUint64(&drops, 1)
			}
		} else {
			r.Close()
			return
		}
	}
}

// SendEvent queues the given event.
// The event's `Id` field will be updated with a value that can be used by
// Sync(). This value is also provided as the return value for convenience.
func (logger *Logger) SendEvent(logEvent *event.Event) uint64 {
	logEvent.Id = atomic.AddUint64(&logger.lastEventId, 1)

	logger.mutex.RLock()
	for _, eventHandlerSpec := range logger.eventHandlerMap {
		if true { //TODO make dropping configurable per-handler
			select {
			case eventHandlerSpec.eventChannel <- logEvent:
				atomic.StoreUint64(&eventHandlerSpec.lastSentEventId, logEvent.Id)
			default:
				fmt.Fprintf(os.Stderr, "Unable to send event to handler. Buffer full. handler=%s\n", eventHandlerSpec.name)
				//TODO generate an event for this, but put in a time-last-dropped so we don't send the message to the handler which is dropping
				// basically if we are dropping, and we last dropped < X seconds ago, don't generate another "event dropped" message
			}
		} else {
			eventHandlerSpec.eventChannel <- logEvent
			atomic.StoreUint64(&eventHandlerSpec.lastSentEventId, logEvent.Id)
		}
	}
	logger.mutex.RUnlock()

	if logger.GetSync() {
		logger.Sync(logEvent.Id)
	}

	return logEvent.Id
}

// InitialState implements the raft.Storage interface.
func (r *Range) InitialState() (raftpb.HardState, raftpb.ConfState, error) {
	var hs raftpb.HardState
	found, err := engine.MVCCGetProto(r.rm.Engine(), keys.RaftHardStateKey(r.Desc().RaftID),
		proto.ZeroTimestamp, true, nil, &hs)
	if err != nil {
		return raftpb.HardState{}, raftpb.ConfState{}, err
	}
	if !found {
		// We don't have a saved HardState, so set up the defaults.
		if r.isInitialized() {
			// Set the initial log term.
			hs.Term = raftInitialLogTerm
			hs.Commit = raftInitialLogIndex

			atomic.StoreUint64(&r.lastIndex, raftInitialLogIndex)
		} else {
			// This is a new range we are receiving from another node. Start
			// from zero so we will receive a snapshot.
			atomic.StoreUint64(&r.lastIndex, 0)
		}
	}

	var cs raftpb.ConfState
	// For uninitalized ranges, membership is unknown at this point.
	if found || r.isInitialized() {
		for _, rep := range r.Desc().Replicas {
			cs.Nodes = append(cs.Nodes, uint64(proto.MakeRaftNodeID(rep.NodeID, rep.StoreID)))
		}
	}

	return hs, cs, nil
}

// apply takes entries received from Raft (after it has been committed) and
// applies them to the current state of the EtcdServer.
// The given entries should not be empty.
func (s *EtcdServer) apply(es []raftpb.Entry, confState *raftpb.ConfState) (uint64, bool) {
	var applied uint64
	for i := range es {
		e := es[i]
		switch e.Type {
		case raftpb.EntryNormal:
			var r pb.Request
			pbutil.MustUnmarshal(&r, e.Data)
			s.w.Trigger(r.ID, s.applyRequest(r))
		case raftpb.EntryConfChange:
			var cc raftpb.ConfChange
			pbutil.MustUnmarshal(&cc, e.Data)
			shouldstop, err := s.applyConfChange(cc, confState)
			s.w.Trigger(cc.ID, err)
			if shouldstop {
				return applied, true
			}
		default:
			log.Panicf("entry type should be either EntryNormal or EntryConfChange")
		}
		atomic.StoreUint64(&s.raftIndex, e.Index)
		atomic.StoreUint64(&s.raftTerm, e.Term)
		applied = e.Index
	}
	return applied, false
}

// NewRange initializes the range using the given metadata.
func NewRange(desc *proto.RangeDescriptor, rm rangeManager) (*Range, error) {
	r := &Range{
		rm:          rm,
		cmdQ:        NewCommandQueue(),
		tsCache:     NewTimestampCache(rm.Clock()),
		respCache:   NewResponseCache(desc.RaftID, rm.Engine()),
		pendingCmds: map[cmdIDKey]*pendingCmd{},
	}
	r.setDescWithoutProcessUpdate(desc)

	lastIndex, err := r.loadLastIndex()
	if err != nil {
		return nil, err
	}
	atomic.StoreUint64(&r.lastIndex, lastIndex)

	appliedIndex, err := r.loadAppliedIndex(r.rm.Engine())
	if err != nil {
		return nil, err
	}
	atomic.StoreUint64(&r.appliedIndex, appliedIndex)

	lease, err := loadLeaderLease(r.rm.Engine(), desc.RaftID)
	if err != nil {
		return nil, err
	}
	atomic.StorePointer(&r.lease, unsafe.Pointer(lease))

	if r.stats, err = newRangeStats(desc.RaftID, rm.Engine()); err != nil {
		return nil, err
	}

	return r, nil
}

// apply takes entries received from Raft (after it has been committed) and
// applies them to the current state of the EtcdServer.
// The given entries should not be empty.
func (s *EtcdServer) apply(es []raftpb.Entry, confState *raftpb.ConfState) (uint64, bool) {
	var applied uint64
	var shouldstop bool
	var err error
	for i := range es {
		e := es[i]
		switch e.Type {
		case raftpb.EntryNormal:
			// raft state machine may generate noop entry when leader confirmation.
			// skip it in advance to avoid some potential bug in the future
			if len(e.Data) == 0 {
				select {
				case s.forceVersionC <- struct{}{}:
				default:
				}
				break
			}
			var r pb.Request
			pbutil.MustUnmarshal(&r, e.Data)
			s.w.Trigger(r.ID, s.applyRequest(r))
		case raftpb.EntryConfChange:
			var cc raftpb.ConfChange
			pbutil.MustUnmarshal(&cc, e.Data)
			shouldstop, err = s.applyConfChange(cc, confState)
			s.w.Trigger(cc.ID, err)
		default:
			plog.Panicf("entry type should be either EntryNormal or EntryConfChange")
		}
		atomic.StoreUint64(&s.r.index, e.Index)
		atomic.StoreUint64(&s.r.term, e.Term)
		applied = e.Index
	}
	return applied, shouldstop
}

func (c *Conn) ResetStats() {
	atomic.StoreUint64(&c.s.Recv, 0)
	atomic.StoreUint64(&c.s.Sent, 0)
	c.s.FirstRecv = time.Time{}
	c.s.FirstSend = time.Time{}
	c.s.LastRecv = time.Time{}
	c.s.LastSend = time.Time{}
	return
}

// Reset resets the cache
func (c *Cache) Reset() {
	c.Lock()
	defer c.Unlock()

	// drop the old map for GC and reset counters
	c.m = make(map[string]*Item, c.capacity)
	atomic.StoreUint64(&c.hits, 0)
	atomic.StoreUint64(&c.misses, 0)

}

func (f *fakeWriter) Write(message *events.Envelope) {
	if message.GetEventType() == events.Envelope_ValueMetric {

		switch message.GetValueMetric().GetName() {
		case "Uptime":
			atomic.StoreUint64(&f.lastUptime, uint64(message.GetValueMetric().GetValue()))
		case "LinuxFileDescriptor":
			atomic.StoreUint64(&f.openFileDescriptors, uint64(message.GetValueMetric().GetValue()))
		}
	}
}

// RLock readlock resurs from thread
// uses double check
func (t *TControl) RLock(threadId uint16, resursId uint64) {
	for {
		if atomic.LoadUint64(&t.writer) != resursId {
			atomic.StoreUint64(&t.readers[threadId], resursId)
			if atomic.LoadUint64(&t.writer) != resursId {
				return
			}
			atomic.StoreUint64(&t.readers[threadId], unlocked)
		}
		t.sleep()
	}
}

func (t *VBMeta) update(from *VBMeta) *VBMeta {
	t.State = parseVBState(from.State).String()
	fromCas := atomic.LoadUint64(&from.LastCas)
	if atomic.LoadUint64(&t.LastCas) < fromCas {
		atomic.StoreUint64(&t.LastCas, fromCas)
	}
	metaCas := atomic.LoadUint64(&from.MetaCas)
	if atomic.LoadUint64(&t.MetaCas) < metaCas {
		atomic.StoreUint64(&t.MetaCas, metaCas)
	}
	return t
}

func (s *Sniffer) loop(src gopacket.ZeroCopyPacketDataSource, on, off time.Duration) {
	var (
		process = uint64(1)               // initially enabled
		total   = uint64(0)               // total packets seen
		count   = uint64(0)               // count of packets captured
		packets = make(chan Packet, 1024) // decoded packets
		rpt     = report.MakeReport()     // the report we build
		turnOn  = (<-chan time.Time)(nil) // signal to start capture (initially enabled)
		turnOff = time.After(on)          // signal to stop capture
		done    = make(chan struct{})     // when src is finished, we're done too
	)

	// As a special case, if our off duty cycle is zero, i.e. 100% sample
	// rate, we simply disable the turn-off signal channel.
	if off == 0 {
		turnOff = nil
	}

	go func() {
		s.read(src, packets, &process, &total, &count)
		close(done)
	}()

	for {
		select {
		case p := <-packets:
			s.Merge(p, &rpt)

		case <-turnOn:
			atomic.StoreUint64(&process, 1) // enable packet capture
			turnOn = nil                    // disable the on switch
			turnOff = time.After(on)        // enable the off switch

		case <-turnOff:
			atomic.StoreUint64(&process, 0) // disable packet capture
			turnOn = time.After(off)        // enable the on switch
			turnOff = nil                   // disable the off switch

		case c := <-s.reports:
			rpt.Sampling.Count = atomic.LoadUint64(&count)
			rpt.Sampling.Total = atomic.LoadUint64(&total)
			interpolateCounts(rpt)
			c <- rpt
			atomic.StoreUint64(&count, 0)
			atomic.StoreUint64(&total, 0)
			rpt = report.MakeReport()

		case <-done:
			return
		}
	}
}

func (r *Rule) Validate(ctx *fasthttp.RequestCtx, rs types.ResponseState) types.ResponseState {
	curTime := uint64(time.Now().Unix())
	if r.Limit != 0 && curTime-r.lastTick >= r.Interval {
		r.filterMatchCount = 0
		atomic.StoreUint64(&r.filterMatchCount, 0)
		atomic.StoreUint64(&r.lastTick, curTime)
		for _, a := range r.Aggregations {
			a.Lock()
			a.Values = make(map[string]uint64)
			a.Unlock()
		}
	}
	for _, t := range r.Filters {
		if _, found := t.Match(ctx); !found {
			return types.UNTOUCHED
		}
	}
	matched := false
	state := rs
	if len(r.Aggregations) == 0 {
		atomic.AddUint64(&r.filterMatchCount, 1)
		if r.filterMatchCount > r.Limit {
			matched = true
		}
	} else {
		for _, a := range r.Aggregations {
			if a.Get(ctx) > r.Limit {
				matched = true
			}
		}
	}
	if matched {
		atomic.AddUint64(&r.MatchCount, 1)
		for _, a := range r.Actions {
			// Skip serving actions if we already had one
			s := a.GetResponseState()
			if state == types.SERVED && s == types.SERVED {
				continue
			}
			err := a.Act(r.Name, ctx)
			// TODO error handling
			if err != nil {
				fmt.Println("meh", err)
			}
			if s > state {
				state = s
			}
		}
	}
	validateRuleList(&r.SubRules, &state, ctx)
	return state
}

// apply takes entries received from Raft (after it has been committed) and
// applies them to the current state of the EtcdServer.
// The given entries should not be empty.
func (s *EtcdServer) apply(es []raftpb.Entry, confState *raftpb.ConfState) (uint64, bool) {
	var applied uint64
	var shouldstop bool
	for i := range es {
		e := es[i]
		// set the consistent index of current executing entry
		s.consistIndex.setConsistentIndex(e.Index)
		switch e.Type {
		case raftpb.EntryNormal:
			// raft state machine may generate noop entry when leader confirmation.
			// skip it in advance to avoid some potential bug in the future
			if len(e.Data) == 0 {
				select {
				case s.forceVersionC <- struct{}{}:
				default:
				}
				break
			}

			var raftReq pb.InternalRaftRequest
			if !pbutil.MaybeUnmarshal(&raftReq, e.Data) { // backward compatible
				var r pb.Request
				pbutil.MustUnmarshal(&r, e.Data)
				s.w.Trigger(r.ID, s.applyRequest(r))
			} else {
				switch {
				case raftReq.V2 != nil:
					req := raftReq.V2
					s.w.Trigger(req.ID, s.applyRequest(*req))
				default:
					s.w.Trigger(raftReq.ID, s.applyV3Request(&raftReq))
				}
			}
		case raftpb.EntryConfChange:
			var cc raftpb.ConfChange
			pbutil.MustUnmarshal(&cc, e.Data)
			removedSelf, err := s.applyConfChange(cc, confState)
			shouldstop = shouldstop || removedSelf
			s.w.Trigger(cc.ID, err)
		default:
			plog.Panicf("entry type should be either EntryNormal or EntryConfChange")
		}
		atomic.StoreUint64(&s.r.index, e.Index)
		atomic.StoreUint64(&s.r.term, e.Term)
		applied = e.Index
	}
	return applied, shouldstop
}