var ErrAlreadyLocked = errors.New("file already locked")

// RLockedFile represents a read locked file, implements a special
// closer which only closes the associated *os.File when the ref count.
// has reached zero, i.e when all the readers have given up their locks.
type RLockedFile struct {
	*LockedFile
	mutex sync.Mutex
	refs  int // Holds read lock refs.
}

	dstRec.KVS = kvs
	return dstRec, nil
}

// convertFromAnnotation - converts values based on the Parquet column's type
// annotations. LogicalType annotations if present override the deprecated
// ConvertedType annotations. Ref:
// https://github.com/apache/parquet-format/blob/master/LogicalTypes.md
func convertFromAnnotation(se *parquettypes.SchemaElement, v interface{}) (interface{}, error) {
	if se == nil {
		return v, nil
	}

	lm.mu.Lock()
	defer lm.mu.Unlock()

	// Try to release lock.
	if isWriteLock {
		if lm.isWriteLock && lm.ref == 1 {
			lm.ref = 0
			lm.isWriteLock = false
			unlocked = true
		}
	} else {
		if !lm.isWriteLock {
			if lm.ref > 0 {
				lm.ref--
				unlocked = true
			}
		}
	}

	return unlocked
}

// ForceUnlock will forcefully clear a write or read lock.

		n.lockMap[resource].ref--
		if n.lockMap[resource].ref < 0 {
			logger.CriticalIf(GlobalContext, errors.New("resource reference count was lower than 0"))
		}
		if n.lockMap[resource].ref == 0 {
			// Remove from the map if there are no more references.
			delete(n.lockMap, resource)
		}
		n.lockMapMutex.Unlock()
	}

	return
}

// Unlock the namespace resource.

		}()
		time.Sleep(1 * time.Millisecond) // wait for goroutine to advance; ref=2

		// Unlock the 1st lock; ref=1 after this line
		nsLk.unlock("volume", "path", false)

		// Taking another lockMapMutex here allows queuing up additional lockers. This should
		// not be required but makes reproduction much easier.
		nsLk.lockMapMutex.Lock()

		// lk3 blocks.

			oRef, lRef, skipRef, snRef, psRef := decryptedRangeRef(test.decSizes, skipLen, readLen, false)
			if o != oRef || l != lRef || skip != skipRef || sn != snRef || ps != psRef {
				t.Errorf("Case %d: test failed: %d %d %d %d %d (Ref: %d %d %d %d %d)",
					i, o, l, skip, sn, ps, oRef, lRef, skipRef, snRef, psRef)
			}
		}

		// Read the last 6Mib+1 bytes of the (decrypted)
		// object
		//

		t.Skip("Unsupported cpu")
	}

	for _, tt := range testCases {
		t.Run(tt.name, func(t *testing.T) {
			ref := loadCompressed(t, tt.name)

			var err error
			dst := make(chan simdjson.Object, 100)
			dec := NewElementReader(dst, &err, &json.ReaderArgs{ContentType: "json"})
			pj, err := simdjson.ParseND(ref, nil)
			if err != nil {
				t.Fatal(err)
			}
			i := pj.Iter()
			cpy := i
			b, err := cpy.MarshalJSON()

import (
	fipssha256 "crypto/sha256"
	"hash"
)

// New returns a new hash.Hash computing the SHA256 checksum.
// The SHA256 implementation is FIPS 140-2 compliant when the
// boringcrypto branch of Go is used.
// Ref: https://github.com/golang/go/tree/dev.boringcrypto
func New() hash.Hash { return fipssha256.New() }

// Sum256 returns the SHA256 checksum of the data.

func (s *ScanRange) Validate() error {
	if s == nil {
		return nil
	}
	if s.Start == nil && s.End == nil {
		// This parameter is optional, but when specified, it must not be empty.
		// Ref: https://docs.aws.amazon.com/AmazonS3/latest/API/API_SelectObjectContent.html#AmazonS3-SelectObjectContent-request-ScanRange
		return errors.New("ScanRange: No Start or End specified")
	}
	if s.Start == nil || s.End == nil {

	if err != nil {
		t.Fatal(err)
	}
	// PutObjectPart should succeed even if part already exists. ref: https://github.com/minio/minio/issues/1930
	_, err = objLayer.PutObjectPart(ctx, "bucket1", "mpartObj1", res.UploadID, 1, mustGetPutObjReader(t, bytes.NewReader(fiveMBBytes), 5*humanize.MiByte, md5Hex, ""), opts)
	if err != nil {