func (cmd *serveEmbedCmd) run(ctx scope.Context, args []string) error {
listener, err := net.Listen("tcp", cmd.addr)
if err != nil {
return err
}
closed := false
m := sync.Mutex{}
closeListener := func() {
m.Lock()
if !closed {
listener.Close()
closed = true
}
m.Unlock()
}
// Spin off goroutine to watch ctx and close listener if shutdown requested.
go func() {
<-ctx.Done()
closeListener()
}()
if err := http.Serve(listener, cmd); err != nil {
fmt.Printf("http[%s]: %s\n", cmd.addr, err)
return err
}
closeListener()
ctx.WaitGroup().Done()
return ctx.Err()
}
// Run runs the query concurrently, and returns the results.
func (q *Query) Run() []interface{} {
rand.Seed(time.Now().UnixNano())
var w sync.WaitGroup
var l sync.Mutex
places := make([]interface{}, len(q.Journey))
for i, r := range q.Journey {
w.Add(1)
go func(types string, i int) {
defer w.Done()
response, err := q.find(types)
if err != nil {
log.Println("Failed to find places:", err)
return
}
if len(response.Results) == 0 {
log.Println("No places found for", types)
return
}
for _, result := range response.Results {
for _, photo := range result.Photos {
photo.URL = "https://maps.googleapis.com/maps/api/place/photo?" +
"maxwidth=1000&photoreference=" + photo.PhotoRef + "&key=" + APIKey
}
}
randI := rand.Intn(len(response.Results))
l.Lock()
places[i] = response.Results[randI]
l.Unlock()
}(r, i)
}
w.Wait() // wait for everything to finish
return places
}
// Put implements the Putter interface.
func (mp *MultiPutter) Put(username string, creds map[string]interface{}) error {
var (
err error
mu sync.Mutex
wg sync.WaitGroup
)
for _, p := range mp.Putters {
wg.Add(1)
go func(p Putter) {
defer wg.Done()
if e := p.Put(username, creds); e != nil {
mu.Lock()
err = multierror.Append(err, e)
mu.Unlock()
}
}(p)
}
wg.Wait()
return err
}
// GetLookupdTopicChannels returns a []string containing a union of the channels
// from all the given lookupd for the given topic
func GetLookupdTopicChannels(topic string, lookupdHTTPAddrs []string) ([]string, error) {
success := false
allChannels := make([]string, 0)
var lock sync.Mutex
var wg sync.WaitGroup
for _, addr := range lookupdHTTPAddrs {
wg.Add(1)
endpoint := fmt.Sprintf("http://%s/channels?topic=%s", addr, url.QueryEscape(topic))
log.Printf("LOOKUPD: querying %s", endpoint)
go func(endpoint string) {
data, err := util.ApiRequest(endpoint)
lock.Lock()
defer lock.Unlock()
defer wg.Done()
if err != nil {
log.Printf("ERROR: lookupd %s - %s", endpoint, err.Error())
return
}
success = true
// {"data":{"channels":["test"]}}
channels, _ := data.Get("channels").StringArray()
allChannels = util.StringUnion(allChannels, channels)
}(endpoint)
}
wg.Wait()
sort.Strings(allChannels)
if success == false {
return nil, errors.New("unable to query any lookupd")
}
return allChannels, nil
}
func (a *apiServer) runPipeline(pipelineInfo *pps.PipelineInfo) error {
ctx, cancel := context.WithCancel(context.Background())
a.lock.Lock()
a.cancelFuncs[*pipelineInfo.Pipeline] = cancel
a.lock.Unlock()
var loopErr error
//TODO this gets really weird with branching... we need to figure out what that looks like.
mostRecentCommit := make(map[pfs.Repo]*pfs.Commit)
var lock sync.Mutex
var wg sync.WaitGroup
for _, inputRepo := range pipelineInfo.InputRepo {
inputRepo := inputRepo
wg.Add(1)
go func() {
defer wg.Done()
var lastCommit *pfs.Commit
listCommitRequest := &pfs.ListCommitRequest{
Repo: inputRepo,
CommitType: pfs.CommitType_COMMIT_TYPE_READ,
From: lastCommit,
Block: true,
}
commitInfos, err := a.pfsAPIClient.ListCommit(ctx, listCommitRequest)
if err != nil && loopErr == nil {
loopErr = err
return
}
for _, commitInfo := range commitInfos.CommitInfo {
lock.Lock()
mostRecentCommit[*inputRepo] = commitInfo.Commit
var commits []*pfs.Commit
for _, commit := range mostRecentCommit {
commits = append(commits, commit)
}
lock.Unlock()
if len(commits) < len(pipelineInfo.InputRepo) {
// we don't yet have a commit for every input repo so there's no way to run the job
continue
}
outParentCommit, err := a.bestParent(pipelineInfo, commitInfo)
if err != nil && loopErr == nil {
loopErr = err
return
}
_, err = a.jobAPIClient.CreateJob(
ctx,
&pps.CreateJobRequest{
Spec: &pps.CreateJobRequest_Pipeline{
Pipeline: pipelineInfo.Pipeline,
},
InputCommit: []*pfs.Commit{commitInfo.Commit},
OutputParent: outParentCommit,
},
)
}
}()
}
wg.Wait()
return loopErr
}
// NewAddresses fetches EC2 IP address list from each region.
//
// If log is nil, defaultLogger is used instead.
func NewAddresses(clients *amazon.Clients, log logging.Logger) *Addresses {
if log == nil {
log = defaultLogger
}
a := newAddresses()
var wg sync.WaitGroup
var mu sync.Mutex // protects a.m
for region, client := range clients.Regions() {
wg.Add(1)
go func(region string, client *amazon.Client) {
defer wg.Done()
addresses, err := client.Addresses()
if err != nil {
log.Error("[%s] fetching IP addresses error: %s", region, err)
return
}
log.Info("[%s] fetched %d addresses", region, len(addresses))
var ok bool
mu.Lock()
if _, ok = a.m[client]; !ok {
a.m[client] = addresses
}
mu.Unlock()
if ok {
panic(fmt.Errorf("[%s] duplicated client=%p: %+v", region, client, addresses))
}
}(region, client)
}
wg.Wait()
return a
}
func main() {
runtime.GOMAXPROCS(runtime.NumCPU()) // 모든 CPU 사용
var mutex = new(sync.Mutex) // 뮤텍스 생성
var cond = sync.NewCond(mutex) // 뮤텍스를 이용하여 조건 변수 생성
c := make(chan bool, 3) // 비동기 채널 생성
for i := 0; i < 3; i++ {
go func(n int) { // 고루틴 3개 생성
mutex.Lock() // 뮤텍스 잠금, cond.Wait() 보호 시작
c <- true // 채널 c에 true를 보냄
fmt.Println("wait begin : ", n)
cond.Wait() // 조건 변수 대기
fmt.Println("wait end : ", n)
mutex.Unlock() // 뮤텍스 잠금 해제, cond.Wait() 보호 종료
}(i)
}
for i := 0; i < 3; i++ {
<-c // 채널에서 값을 꺼냄, 고루틴 3개가 모두 실행될 때까지 기다림
}
for i := 0; i < 3; i++ {
mutex.Lock() // 뮤텍스 잠금, cond.Signal() 보호 시작
fmt.Println("signal : ", i)
cond.Signal() // 대기하고 있는 고루틴을 하나씩 깨움
mutex.Unlock() // 뮤텍스 잠금 해제, cond.Signal() 보고 종료
}
fmt.Scanln()
}
func benchmarkMutexLock(b *testing.B) {
var lock sync.Mutex
for i := 0; i < b.N; i++ {
lock.Lock()
lock.Unlock()
}
}
func TestPseudoRandomSend(t *testing.T) {
n := 100
for _, chanCap := range []int{0, n} {
c := make(chan int, chanCap)
l := make([]int, n)
var m sync.Mutex
m.Lock()
go func() {
for i := 0; i < n; i++ {
runtime.Gosched()
l[i] = <-c
}
m.Unlock()
}()
for i := 0; i < n; i++ {
select {
case c <- 1:
case c <- 0:
}
}
m.Lock() // wait
n0 := 0
n1 := 0
for _, i := range l {
n0 += (i + 1) % 2
n1 += i
}
if n0 <= n/10 || n1 <= n/10 {
t.Errorf("Want pseudorandom, got %d zeros and %d ones (chan cap %d)", n0, n1, chanCap)
}
}
}
func main() {
flag.Parse()
if *zookeeper == "" {
printUsageErrorAndExit("You have to provide a zookeeper connection string using -zookeeper, or the ZOOKEEPER_PEERS environment variable")
}
conf := kazoo.NewConfig()
conf.Timeout = time.Duration(*zookeeperTimeout) * time.Millisecond
kz, err := kazoo.NewKazooFromConnectionString(*zookeeper, conf)
if err != nil {
printErrorAndExit(69, "Failed to connect to Zookeeper: %v", err)
}
defer func() { _ = kz.Close() }()
topics, err := kz.Topics()
if err != nil {
printErrorAndExit(69, "Failed to get Kafka topics from Zookeeper: %v", err)
}
sort.Sort(topics)
var (
wg sync.WaitGroup
l sync.Mutex
stdout = make([]string, len(topics))
)
for i, topic := range topics {
wg.Add(1)
go func(i int, topic *kazoo.Topic) {
defer wg.Done()
buffer := bytes.NewBuffer(make([]byte, 0))
partitions, err := topic.Partitions()
if err != nil {
printErrorAndExit(69, "Failed to get Kafka topic partitions from Zookeeper: %v", err)
}
fmt.Fprintf(buffer, "Topic: %s\tPartitions: %d\n", topic.Name, len(partitions))
for _, partition := range partitions {
leader, _ := partition.Leader()
isr, _ := partition.ISR()
fmt.Fprintf(buffer, "\tPartition: %d\tReplicas: %v\tLeader: %d\tISR: %v\n", partition.ID, partition.Replicas, leader, isr)
}
l.Lock()
stdout[i] = buffer.String()
l.Unlock()
}(i, topic)
}
wg.Wait()
for _, msg := range stdout {
fmt.Print(msg)
}
}
func diameter(digests []string, diffStore diff.DiffStore) int {
// TODO Parallelize.
lock := sync.Mutex{}
max := 0
wg := sync.WaitGroup{}
for {
if len(digests) <= 2 {
break
}
wg.Add(1)
go func(d1 string, d2 []string) {
defer wg.Done()
dms, err := diffStore.Get(d1, d2)
if err != nil {
glog.Errorf("Unable to get diff: %s", err)
return
}
localMax := 0
for _, dm := range dms {
if dm.NumDiffPixels > localMax {
localMax = dm.NumDiffPixels
}
}
lock.Lock()
defer lock.Unlock()
if localMax > max {
max = localMax
}
}(digests[0], digests[1:2])
digests = digests[1:]
}
wg.Wait()
return max
}
func cacher(regMap map[*regexp.Regexp]string) func(string) string {
var cache = make(map[string]string)
var cacheMu sync.Mutex
return func(ext string) string {
cacheMu.Lock()
defer cacheMu.Unlock()
memoized, ok := cache[ext]
if ok {
return memoized
}
bExt := []byte(ext)
for regEx, mimeType := range regMap {
if regEx != nil && regEx.Match(bExt) {
memoized = mimeType
break
}
}
cache[ext] = memoized
return memoized
}
}
// generic loop (executed in a goroutine) that periodically wakes up to walk
// the priority queue and call the callback
func (c *Channel) pqWorker(pq *pqueue.PriorityQueue, mutex *sync.Mutex, callback func(item *pqueue.Item)) {
ticker := time.NewTicker(defaultWorkerWait)
for {
select {
case <-ticker.C:
case <-c.exitChan:
goto exit
}
now := time.Now().UnixNano()
for {
mutex.Lock()
item, _ := pq.PeekAndShift(now)
mutex.Unlock()
if item == nil {
break
}
callback(item)
}
}
exit:
log.Printf("CHANNEL(%s): closing ... pqueue worker", c.name)
ticker.Stop()
}
func memoizeBytes() byteDescription {
cache := map[int64]string{}
suffixes := []string{"B", "KB", "MB", "GB", "TB", "PB"}
maxLen := len(suffixes) - 1
var cacheMu sync.Mutex
return func(b int64) string {
cacheMu.Lock()
defer cacheMu.Unlock()
description, ok := cache[b]
if ok {
return description
}
bf := float64(b)
i := 0
description = ""
for {
if bf/BytesPerKB < 1 || i >= maxLen {
description = fmt.Sprintf("%.2f%s", bf, suffixes[i])
break
}
bf /= BytesPerKB
i += 1
}
cache[b] = description
return description
}
}
func main() {
var mtx sync.Mutex
var cnd *sync.Cond
var cnds [N]*sync.Cond
var mtxs [N]sync.Mutex
cnd = sync.NewCond(&mtx)
for i := 0; i < N; i++ {
cnds[i] = sync.NewCond(&mtxs[i])
}
for i := 0; i < N; i++ {
go func(me int, m *sync.Mutex, c1 *sync.Cond, c2 *sync.Cond) {
fmt.Printf("Hello, world. %d\n", me)
if me == 0 {
cnd.Signal()
}
for j := 0; j < 10000000; j++ {
m.Lock()
c1.Wait()
m.Unlock()
c2.Signal()
}
if me == N-1 {
cnd.Signal()
}
}(i, &mtxs[i], cnds[i], cnds[(i+1)%N])
}
mtx.Lock()
cnd.Wait()
mtx.Unlock()
cnds[0].Signal()
mtx.Lock()
cnd.Wait()
mtx.Unlock()
}
// golang.org/issue/13924
// This used to fail after many iterations, especially with -race:
// go test -v -run=TestTransportDoubleCloseOnWriteError -count=500 -race
func TestTransportDoubleCloseOnWriteError(t *testing.T) {
var (
mu sync.Mutex
conn net.Conn // to close if set
)
st := newServerTester(t,
func(w http.ResponseWriter, r *http.Request) {
mu.Lock()
defer mu.Unlock()
if conn != nil {
conn.Close()
}
},
optOnlyServer,
)
defer st.Close()
tr := &Transport{
TLSClientConfig: tlsConfigInsecure,
DialTLS: func(network, addr string, cfg *tls.Config) (net.Conn, error) {
tc, err := tls.Dial(network, addr, cfg)
if err != nil {
return nil, err
}
mu.Lock()
defer mu.Unlock()
conn = tc
return tc, nil
},
}
defer tr.CloseIdleConnections()
c := &http.Client{Transport: tr}
c.Get(st.ts.URL)
}
func (f *File) Save() (err error) {
var done sync.Mutex
done.Lock()
f.cbs <- func() {
defer done.Unlock()
tmpPath := f.path + "." + strconv.FormatInt(rand.Int63(), 10)
var tmpF *os.File
tmpF, err = os.Create(tmpPath)
if err != nil {
return
}
defer tmpF.Close()
buf := new(bytes.Buffer)
err = json.NewEncoder(buf).Encode(f.Obj)
if err != nil {
return
}
// indent
indentBuf := new(bytes.Buffer)
err = json.Indent(indentBuf, buf.Bytes(), "", " ")
if err != nil {
return
}
_, err = tmpF.Write(indentBuf.Bytes())
if err != nil {
return
}
err = os.Rename(tmpPath, f.path)
if err != nil {
return
}
}
done.Lock()
return
}
func (wr *Wrangler) getMastersPosition(shards []*topo.ShardInfo) (map[*topo.ShardInfo]myproto.ReplicationPosition, error) {
mu := sync.Mutex{}
result := make(map[*topo.ShardInfo]myproto.ReplicationPosition)
wg := sync.WaitGroup{}
rec := concurrency.AllErrorRecorder{}
for _, si := range shards {
wg.Add(1)
go func(si *topo.ShardInfo) {
defer wg.Done()
log.Infof("Gathering master position for %v", si.MasterAlias)
ti, err := wr.ts.GetTablet(si.MasterAlias)
if err != nil {
rec.RecordError(err)
return
}
pos, err := wr.ai.MasterPosition(ti, wr.ActionTimeout())
if err != nil {
rec.RecordError(err)
return
}
log.Infof("Got master position for %v", si.MasterAlias)
mu.Lock()
result[si] = pos
mu.Unlock()
}(si)
}
wg.Wait()
return result, rec.Error()
}
// GetNSQDTopics returns a []string containing all the topics
// produced by the given nsqd
func GetNSQDTopics(nsqdHTTPAddrs []string) ([]string, error) {
topics := make([]string, 0)
var lock sync.Mutex
var wg sync.WaitGroup
success := false
for _, addr := range nsqdHTTPAddrs {
wg.Add(1)
endpoint := fmt.Sprintf("http://%s/stats?format=json", addr)
log.Printf("NSQD: querying %s", endpoint)
go func(endpoint string) {
data, err := util.ApiRequest(endpoint)
lock.Lock()
defer lock.Unlock()
defer wg.Done()
if err != nil {
log.Printf("ERROR: lookupd %s - %s", endpoint, err.Error())
return
}
success = true
topicList, _ := data.Get("topics").Array()
for i := range topicList {
topicInfo := data.Get("topics").GetIndex(i)
topics = util.StringAdd(topics, topicInfo.Get("topic_name").MustString())
}
}(endpoint)
}
wg.Wait()
sort.Strings(topics)
if success == false {
return nil, errors.New("unable to query any nsqd")
}
return topics, nil
}
func findImportGoPath(pkgName string, symbols map[string]bool) (string, bool, error) {
// Fast path for the standard library.
// In the common case we hopefully never have to scan the GOPATH, which can
// be slow with moving disks.
if pkg, rename, ok := findImportStdlib(pkgName, symbols); ok {
return pkg, rename, nil
}
// TODO(sameer): look at the import lines for other Go files in the
// local directory, since the user is likely to import the same packages
// in the current Go file. Return rename=true when the other Go files
// use a renamed package that's also used in the current file.
pkgIndexOnce.Do(loadPkgIndex)
// Collect exports for packages with matching names.
var wg sync.WaitGroup
var pkgsMu sync.Mutex // guards pkgs
// full importpath => exported symbol => True
// e.g. "net/http" => "Client" => True
pkgs := make(map[string]map[string]bool)
pkgIndex.Lock()
for _, pkg := range pkgIndex.m[pkgName] {
wg.Add(1)
go func(importpath, dir string) {
defer wg.Done()
exports := loadExports(dir)
if exports != nil {
pkgsMu.Lock()
pkgs[importpath] = exports
pkgsMu.Unlock()
}
}(pkg.importpath, pkg.dir)
}
pkgIndex.Unlock()
wg.Wait()
// Filter out packages missing required exported symbols.
for symbol := range symbols {
for importpath, exports := range pkgs {
if !exports[symbol] {
delete(pkgs, importpath)
}
}
}
if len(pkgs) == 0 {
return "", false, nil
}
// If there are multiple candidate packages, the shortest one wins.
// This is a heuristic to prefer the standard library (e.g. "bytes")
// over e.g. "github.com/foo/bar/bytes".
shortest := ""
for importPath := range pkgs {
if shortest == "" || len(importPath) < len(shortest) {
shortest = importPath
}
}
return shortest, false, nil
}
func testChanSendBarrier(useSelect bool) {
var wg sync.WaitGroup
var globalMu sync.Mutex
outer := 100
inner := 100000
if testing.Short() {
outer = 10
inner = 1000
}
for i := 0; i < outer; i++ {
wg.Add(1)
go func() {
defer wg.Done()
var garbage []byte
for j := 0; j < inner; j++ {
_, err := doRequest(useSelect)
_, ok := err.(myError)
if !ok {
panic(1)
}
garbage = make([]byte, 1<<10)
}
globalMu.Lock()
global = garbage
globalMu.Unlock()
}()
}
wg.Wait()
}
func (socket *mongoSocket) loginRun(db string, query, result interface{}, f func() error) error {
var mutex sync.Mutex
var replyErr error
mutex.Lock()
op := queryOp{}
op.query = query
op.collection = db + ".$cmd"
op.limit = -1
op.replyFunc = func(err error, reply *replyOp, docNum int, docData []byte) {
defer mutex.Unlock()
if err != nil {
replyErr = err
return
}
err = bson.Unmarshal(docData, result)
if err != nil {
replyErr = err
} else {
// Must handle this within the read loop for the socket, so
// that concurrent login requests are properly ordered.
replyErr = f()
}
}
err := socket.Query(&op)
if err != nil {
return err
}
mutex.Lock() // Wait.
return replyErr
}
// Returns the host containers, non-Kubernetes containers, and an error (if any).
func (self *kubeNodeMetrics) getNodesInfo(nodeList *nodes.NodeList, start, end time.Time) ([]api.Container, []api.Container, error) {
var (
lock sync.Mutex
wg sync.WaitGroup
)
hostContainers := make([]api.Container, 0, len(nodeList.Items))
rawContainers := make([]api.Container, 0, len(nodeList.Items))
for host, info := range nodeList.Items {
wg.Add(1)
go func(host nodes.Host, info nodes.Info) {
defer wg.Done()
if hostContainer, containers, err := self.updateStats(host, info, start, end); err == nil {
lock.Lock()
defer lock.Unlock()
if hostContainers != nil {
hostContainers = append(hostContainers, *hostContainer)
}
rawContainers = append(rawContainers, containers...)
}
}(host, info)
}
wg.Wait()
return hostContainers, rawContainers, nil
}
func createPodWorkers() (*podWorkers, map[types.UID][]syncPodRecord) {
lock := sync.Mutex{}
processed := make(map[types.UID][]syncPodRecord)
fakeRecorder := &record.FakeRecorder{}
fakeRuntime := &containertest.FakeRuntime{}
fakeCache := containertest.NewFakeCache(fakeRuntime)
podWorkers := newPodWorkers(
func(options syncPodOptions) error {
func() {
lock.Lock()
defer lock.Unlock()
pod := options.pod
processed[pod.UID] = append(processed[pod.UID], syncPodRecord{
name: pod.Name,
updateType: options.updateType,
})
}()
return nil
},
fakeRecorder,
queue.NewBasicWorkQueue(&util.RealClock{}),
time.Second,
time.Second,
fakeCache,
)
return podWorkers, processed
}
func TestDNSAdd(t *testing.T) {
mtx := sync.Mutex{}
published := map[string]entry{}
s := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
mtx.Lock()
defer mtx.Unlock()
parts := strings.SplitN(r.URL.Path, "/", 4)
containerID, ip := parts[2], net.ParseIP(parts[3])
fqdn := r.FormValue("fqdn")
published[fqdn] = entry{containerID, ip}
w.WriteHeader(http.StatusNoContent)
}))
defer s.Close()
client := weave.NewClient(s.URL)
err := client.AddDNSEntry(mockHostname, mockContainerID, mockIP)
if err != nil {
t.Fatal(err)
}
want := map[string]entry{
mockHostname: {mockContainerID, mockIP},
}
if !reflect.DeepEqual(published, want) {
t.Fatal(test.Diff(published, want))
}
}
// EnumerateAll runs fn for each blob in src.
// If fn returns an error, iteration stops and fn isn't called again.
// EnumerateAll will not return concurrently with fn.
func EnumerateAll(src BlobEnumerator, fn func(blob.SizedRef) error) error {
const batchSize = 1000
var mu sync.Mutex // protects returning with an error while fn is still running
after := ""
errc := make(chan error, 1)
for {
ch := make(chan blob.SizedRef, 16)
n := 0
go func() {
var err error
for sb := range ch {
if err != nil {
continue
}
mu.Lock()
err = fn(sb)
mu.Unlock()
after = sb.Ref.String()
n++
}
errc <- err
}()
err := src.EnumerateBlobs(ch, after, batchSize)
if err != nil {
mu.Lock() // make sure fn callback finished; no need to unlock
return err
}
if err := <-errc; err != nil {
return err
}
if n == 0 {
return nil
}
}
}
func (c *Corpus) scanPrefix(mu *sync.Mutex, s sorted.KeyValue, prefix string) (err error) {
typeKey := typeOfKey(prefix)
fn, ok := corpusMergeFunc[typeKey]
if !ok {
panic("No registered merge func for prefix " + prefix)
}
n, t0 := 0, time.Now()
it := queryPrefixString(s, prefix)
defer closeIterator(it, &err)
for it.Next() {
n++
if n == 1 {
mu.Lock()
defer mu.Unlock()
}
if err := fn(c, it.KeyBytes(), it.ValueBytes()); err != nil {
return err
}
}
if logCorpusStats {
d := time.Since(t0)
log.Printf("Scanned prefix %q: %d rows, %v", prefix[:len(prefix)-1], n, d)
}
return nil
}
func GenMessages(c *C, prefix, topic string, keys map[string]int) map[string][]*sarama.ProducerMessage {
config := NewConfig()
config.ClientID = "producer"
config.Kafka.SeedPeers = testKafkaPeers
producer, err := SpawnGracefulProducer(config)
c.Assert(err, IsNil)
messages := make(map[string][]*sarama.ProducerMessage)
var wg sync.WaitGroup
var lock sync.Mutex
for key, count := range keys {
for i := 0; i < count; i++ {
key := key
message := fmt.Sprintf("%s:%s:%d", prefix, key, i)
spawn(&wg, func() {
keyEncoder := sarama.StringEncoder(key)
msgEncoder := sarama.StringEncoder(message)
prodMsg, err := producer.Produce(topic, keyEncoder, msgEncoder)
c.Assert(err, IsNil)
log.Infof("*** produced: topic=%s, partition=%d, offset=%d, message=%s",
topic, prodMsg.Partition, prodMsg.Offset, message)
lock.Lock()
messages[key] = append(messages[key], prodMsg)
lock.Unlock()
})
}
}
wg.Wait()
// Sort the produced messages in ascending order of their offsets.
for _, keyMessages := range messages {
sort.Sort(MessageSlice(keyMessages))
}
return messages
}
// Modify renames the given images
func (g *GceImages) DeprecateImages(opts *DeprecateOptions) error {
var (
wg sync.WaitGroup
mu sync.Mutex // protects multiErrors
multiErrors error
)
for _, n := range opts.Names {
wg.Add(1)
go func(name string) {
st := &compute.DeprecationStatus{
State: opts.State,
}
_, err := g.svc.Deprecate(g.config.ProjectID, name, st).Do()
if err != nil {
mu.Lock()
multiErrors = multierror.Append(multiErrors, err)
mu.Unlock()
}
wg.Done()
}(n)
}
wg.Wait()
return multiErrors
}
func artificialSeed(input []string, power int) [][]string {
var result [][]string
if isChainEmpty(input) {
input = randomChain()[:1]
}
var wg sync.WaitGroup
var mtx sync.Mutex
for _, word := range input {
if word == stop {
break
}
for i := 0; i < power; i++ {
wg.Add(1)
go func(word string, i int) {
defer wg.Done()
for _, mutation := range createSeeds(mutateChain(word, randomChain())) {
mtx.Lock()
result = append(result, mutation)
mtx.Unlock()
runtime.Gosched()
}
}(word, i)
}
}
wg.Wait()
/*if config.Debug {
log.Println("artificialSeed(", dump(input)+", "+fmt.Sprint(power)+")="+fmt.Sprint(result))
}*/
return result
}