Classes | Functions | Variables
tornado::stack_context Namespace Reference

Classes

class  _State
class  ExceptionStackContext
class  NullContext
class  StackContext
class  StackContextInconsistentError

Functions

def _handle_exception
def _remove_deactivated
def run_with_stack_context
def wrap

Variables

tuple _state = _State()

Function Documentation

def tornado.stack_context._handle_exception (   tail,
  exc 
) [private]

Definition at line 352 of file stack_context.py.

def tornado.stack_context._remove_deactivated (   contexts) [private]
Remove deactivated handlers from the chain

Definition at line 227 of file stack_context.py.

def tornado.stack_context.run_with_stack_context (   context,
  func 
)
Run a coroutine ``func`` in the given `StackContext`.

It is not safe to have a ``yield`` statement within a ``with StackContext``
block, so it is difficult to use stack context with `.gen.coroutine`.
This helper function runs the function in the correct context while
keeping the ``yield`` and ``with`` statements syntactically separate.

Example::

    @gen.coroutine
    def incorrect():
        with StackContext(ctx):
            # ERROR: this will raise StackContextInconsistentError
            yield other_coroutine()

    @gen.coroutine
    def correct():
        yield run_with_stack_context(StackContext(ctx), other_coroutine)

.. versionadded:: 3.1

Definition at line 365 of file stack_context.py.

Returns a callable object that will restore the current `StackContext`
when executed.

Use this whenever saving a callback to be executed later in a
different execution context (either in a different thread or
asynchronously in the same thread).

Definition at line 253 of file stack_context.py.


Variable Documentation

Definition at line 85 of file stack_context.py.



rosbridge_server
Author(s): Jonathan Mace
autogenerated on Thu Jun 6 2019 21:51:51