return HashBorrower{pool: &s.HasherPool, borrowed: make([]hash.Hash, 0, 2)}
}

// HashBorrower keeps track of borrowed hashers and allows to return them all.
type HashBorrower struct {
	pool     *bpool.Pool[hash.Hash]
	borrowed []hash.Hash
}

// Borrow a single hasher.
func (h *HashBorrower) Borrow() hash.Hash {
	hasher := h.pool.Get()
	h.borrowed = append(h.borrowed, hasher)
	hasher.Reset()
	return hasher
}

		t.Fatal("Unlock timed out, which should not happen")
	case <-timer.C:
	}
}

// Borrowed from mutex_test.go
func HammerMutex(m *DRWMutex, loops int, cdone chan bool) {
	for range loops {
		m.Lock(id, source)
		m.Unlock(context.Background())
	}
	cdone <- true
}

// Borrowed from mutex_test.go
func TestMutex(t *testing.T) {
	loops := 200
	if testing.Short() {
		loops = 5
	}

| :--        | :--      |
| *Type*     | *String* |
| *Required* | *No*     |

### Version

Indicates STS API version information, the only supported value is '2011-06-15'. This value is borrowed from AWS STS API documentation for compatibility reasons.

| Params     | Value    |
| :--        | :--      |
| *Type*     | *String* |
| *Required* | *Yes*    |

### DurationSeconds

// particular named input list, which may only be part of the op's inputs).
TF_CAPI_EXPORT extern int TFE_OpGetFlatInputCount(const TFE_Op* op,
                                                  TF_Status* status);
// Returns a borrowed reference to one of `op`'s inputs. Use
// `TFE_TensorHandleCopySharingTensor` to make a new reference.
TF_CAPI_EXPORT extern TFE_TensorHandle* TFE_OpGetFlatInput(const TFE_Op* op,

| _Required_           | _Yes_                                          |

### Version

Indicates STS API version information, the only supported value is '2011-06-15'.  This value is borrowed from AWS STS API documentation for compatibility reasons.

| Params     | Value    |
| :--        | :--      |
| _Type_     | _String_ |
| _Required_ | _Yes_    |

### DurationSeconds

		return
	}

	ctx = newContext(r, w, action)

	// Validate the authentication result here so that failures will be audit-logged.
	if apiErrCode != ErrNone {
		stsErr := apiToSTSError(apiErrCode)
		// Borrow the description error from the API error code
		writeSTSErrorResponse(ctx, w, stsErr, errors.New(errorCodes[apiErrCode].Description))
		return
	}

	if err := claims.populateSessionPolicy(r.Form); err != nil {