MutexLock

public final class MutexLock

Locks a mutex resource. The output is the lock. So long as the lock tensor

is alive, any other request to use `MutexLock` with this mutex will wait.

This is particularly useful for creating a critical section when used in conjunction with `MutexLockIdentity`:

mutex = mutex_v2(
   shared_name=handle_name, container=container, name=name)
 
 def execute_in_critical_section(fn, *args, **kwargs):
   lock = gen_resource_variable_ops.mutex_lock(mutex)
 
   with ops.control_dependencies([lock]):
     r = fn(*args, **kwargs)
 
   with ops.control_dependencies(nest.flatten(r)):
     with ops.colocate_with(mutex):
       ensure_lock_exists = mutex_lock_identity(lock)
 
     # Make sure that if any element of r is accessed, all of
     # them are executed together.
     r = nest.map_structure(tf.identity, r)
 
   with ops.control_dependencies([ensure_lock_exists]):
     return nest.map_structure(tf.identity, r)
 

While `fn` is running in the critical section, no other functions which wish to use this critical section may run.

Often the use case is that two executions of the same graph, in parallel, wish to run `fn`; and we wish to ensure that only one of them executes at a time. This is especially important if `fn` modifies one or more variables at a time.

It is also useful if two separate functions must share a resource, but we wish to ensure the usage is exclusive.

Constants

String

OP_NAME

The name of this op, as known by TensorFlow core engine

Public Methods

Output<TType>	asOutput() Returns the symbolic handle of the tensor.
static MutexLock	create(Scope scope, Operand<?> mutex) Factory method to create a class wrapping a new MutexLock operation.
Output<?>	mutexLock() A tensor that keeps a shared pointer to a lock on the mutex; when the Tensor is destroyed, the use count on the shared pointer is decreased by 1.

Inherited Methods

From class org.tensorflow.op.RawOp

final boolean	equals(Object obj)
final int	hashCode()
Operation	op() Return this unit of computation as a single Operation.
final String	toString()

From class java.lang.Object

boolean	equals(Object arg0)
final Class<?>	getClass()
int	hashCode()
final void	notify()
final void	notifyAll()
String	toString()
final void	wait(long arg0, int arg1)
final void	wait(long arg0)
final void	wait()

From interface org.tensorflow.op.Op

abstract ExecutionEnvironment	env() Return the execution environment this op was created in.
abstract Operation	op() Return this unit of computation as a single Operation.

From interface org.tensorflow.Operand

abstract Output<TType>	asOutput() Returns the symbolic handle of the tensor.
abstract TType	asTensor() Returns the tensor at this operand.
abstract Shape	shape() Returns the (possibly partially known) shape of the tensor referred to by the Output of this operand.
abstract Class<TType>	type() Returns the tensor type of this operand

From interface org.tensorflow.ndarray.Shaped

abstract int	rank()
abstract Shape	shape()
abstract long	size() Computes and returns the total size of this container, in number of values.

Constants

public static final String OP_NAME

The name of this op, as known by TensorFlow core engine

Constant Value: "MutexLock"

Public Methods

public Output<TType> asOutput ()

Returns the symbolic handle of the tensor.

Inputs to TensorFlow operations are outputs of another TensorFlow operation. This method is used to obtain a symbolic handle that represents the computation of the input.

public static MutexLock create (Scope scope, Operand<?> mutex)

Factory method to create a class wrapping a new MutexLock operation.

Parameters

scope	current scope
mutex	The mutex resource to lock.

Returns

• a new instance of MutexLock

public Output<?> mutexLock ()

A tensor that keeps a shared pointer to a lock on the mutex; when the Tensor is destroyed, the use count on the shared pointer is decreased by 1. When it reaches 0, the lock is released.