// BatchJobPool batch job pool
type BatchJobPool struct {
	ctx          context.Context
	objLayer     ObjectLayer
	once         sync.Once
	mu           sync.Mutex
	jobCh        chan *BatchJobRequest
	jmu          sync.Mutex // protects jobCancelers
	jobCancelers map[string]context.CancelFunc
	workerKillCh chan struct{}
	workerSize   int
}

var globalBatchJobPool *BatchJobPool

	lastRead readOp // last read operation, so that Unread* can work correctly.

	// Copying and modifying a non-zero Buffer is prone to error,
	// but we cannot employ the noCopy trick used by WaitGroup and Mutex,
	// which causes vet's copylocks checker to report misuse, as vet
	// cannot reliably distinguish the zero and non-zero cases.
	// See #26462, #25907, #47276, #48398 for history.
}

		})
		return
	}
	ctx = lkctx.Context()
	defer lk.Unlock(lkctx)

	rinfos := replicatedInfos{Targets: make([]replicatedTargetInfo, 0, len(dsc.targetsMap))}
	var wg sync.WaitGroup
	var mu sync.Mutex
	for _, tgtEntry := range dsc.targetsMap {
		if !tgtEntry.Replicate {
			continue
		}
		// if dobj.TargetArn is not empty string, this is a case of specific target being re-synced.

	src     lcEventSrc
	event   lifecycle.Event
}

type transitionState struct {
	transitionCh chan transitionTask

	ctx        context.Context
	objAPI     ObjectLayer
	mu         sync.Mutex
	numWorkers int
	killCh     chan struct{}

	activeTasks          atomic.Int64
	missedImmediateTasks atomic.Int64

	lastDayMu    sync.RWMutex
	lastDayStats map[string]*lastDayTierStats
}

)

// Random number state.
// We generate random temporary file names so that there's a good
// chance the file doesn't exist yet.
var (
	randN  uint32
	randmu sync.Mutex
)

// Temp files created in default Tmp dir
var globalTestTmpDir = os.TempDir()

// reseed - returns a new seed every time the function is called.
func reseed() uint32 {

	credentials auth.Credentials, t *testing.T,
) {
	bucketName1 := fmt.Sprintf("%s-1", bucketName)

	const n = 100
	start := make(chan struct{})
	var ok, errs int
	var wg sync.WaitGroup
	var mu sync.Mutex
	wg.Add(n)
	for range n {
		go func() {
			defer wg.Done()
			// Sync start.
			<-start
			if err := obj.MakeBucket(GlobalContext, bucketName1, MakeBucketOptions{}); err != nil {

	errFatal(err)

	// Wait for the server start the request.
	<-reqStarted

	// Block until we have exceeded the deadline several times over.
	nowBlocking := make(chan struct{})
	var mu sync.Mutex
	time.AfterFunc(time.Second, func() {
		mu.Lock()
		cancel()
		close(nowBlocking)
		mu.Unlock()
	})
	if inCap > 0 {
		go func() {
			defer close(st.Requests)
			if !blockReq {

</p>

<pre>
// A Mutex is a data type with two methods, Lock and Unlock.
type Mutex struct         { /* Mutex fields */ }
func (m *Mutex) Lock()    { /* Lock implementation */ }
func (m *Mutex) Unlock()  { /* Unlock implementation */ }

// NewMutex has the same composition as Mutex but its method set is empty.
type NewMutex Mutex

[GC guide](/doc/gc-guide#Linux_transparent_huge_pages), or switch to a Linux
distribution that disables transparent huge pages altogether.

Go 1.22 added contention on runtime-internal locks to the [`mutex`
profile](/pkg/runtime/pprof#Profile). Contention on these locks is always
reported at `runtime._LostContendedRuntimeLock`. Complete stack traces of
runtime locks can be enabled with the [`runtimecontentionstacks`

	return diskMetric
}

// lockedLastMinuteLatency accumulates totals lockless for each second.
type lockedLastMinuteLatency struct {
	cachedSec int64
	cached    atomic.Pointer[AccElem]
	mu        sync.Mutex
	init      sync.Once
	lastMinuteLatency
}

func (e *lockedLastMinuteLatency) add(value time.Duration) {
	e.addSize(value, 0)
}

// addSize will add a duration and size.