Future set_exception
Future Object¶ class asyncio.Future (*, loop=None) ¶. A Future represents an eventual result of an asynchronous operation. Not thread-safe. Future is an awaitable object. Coroutines can await on Future objects until they either have a result or an exception set, or until they are cancelled. The following are code examples for showing how to use concurrent.futures.Future().They are from open source Python projects. You can vote up the examples you like or vote down the ones you don't like. A promise must either be satisfied via set_value() or have an exception set via set_exception() before its lifetime ends if its future is to be consumed. A satisfied promise can die without consequence, and get() becomes available on the future. A promise is an object that can store a value of type T to be retrieved by a future object (possibly in another thread), offering a synchronization point. On construction, promise objects are associated to a new shared state on which they can store either a value of type T or an exception derived from std::exception. This shared state can be associated to a future object by calling member get
2019年5月2日 obj 参数会是保持原样，如果obj 是 Future 、 Task 或类似期程的对象( 如果期程 状态为完成，并由 set_exception() 方法设置一个异常，那么这个
Name Description; get_future: Returns a future associated with this promise.: set_exception: Atomically sets the result of this promise to indicate an exception. set_exception_at_thread_exit Future.set_result and Future.set_exception now raise InvalidStateError if the futures are not pending or running. This mirrors the behavior of asyncio.Future, and The following are code examples for showing how to use concurrent.futures.Future().They are from open source Python projects. You can vote up the examples you like or vote down the ones you don't like. Changes ¶ v2.0.2 (2019-12-02 Change the argument of pykka.Future.set_exception() from an exception instance to a exc_info three-tuple. Passing just an exception instance to the method still works, but it is deprecated and may be unsupported in a future release. raise # Propagate the "future" exception """ This approach will create reference cycles. They will eventually cleaned up, but I noticed this issue because the cycle clean up phase was touching big objects with many references but unused for a long time, so they were living in the SWAP.
Tornado and Asyncio Mixed example. GitHub Gist: instantly share code, notes, and snippets.
void set_exception (exception_ptr p);. Set exception. Stores the exception pointer p in the shared state, which becomes ready. If a future object that is associated I asyncio was providing such functionality long time ago, but it was cut. Now in documentation you can read: asyncio.Task inherits from Future Futures and tasks can be cancelled explicitly with their Future.cancel() method. Don't call set_result() or set_exception() method of Future if the future is
asyncio.Future.set_exception(exc) sets the exception attribute to exc, but exc.__traceback__ refers to frames and the current frame probably referes to the future instance. Tell me if I'm wrong, but it looks like a reference cycle: fut
Futures and tasks can be cancelled explicitly with their Future.cancel() method. Don't call set_result() or set_exception() method of Future if the future is InvalidStateError when calling set_exception() on a cancelled asyncio.Future . New in version 6.0. tornado.concurrent. future_set_exc_info (future: Union[futures . This method should only be used by Executor implementations and unit tests. Future.set_exception(exception)¶. Sets the result of the work associated with the #include
Future.set_result and Future.set_exception now raise InvalidStateError if the futures are not pending or running. This mirrors the behavior of asyncio.Future, and
InvalidStateError when calling set_exception() on a cancelled asyncio.Future . New in version 6.0. tornado.concurrent. future_set_exc_info (future: Union[futures . This method should only be used by Executor implementations and unit tests. Future.set_exception(exception)¶. Sets the result of the work associated with the #include
tornado.concurrent — Work with Future objects¶. Utilities for working with Future objects.. Tornado previously provided its own Future class, but now uses asyncio.Future.This module contains utility functions for working with asyncio.Future in a way that is backwards-compatible with Tornado’s old Future implementation.. While this module is an important part of Tornado’s internal Tornado and Asyncio Mixed example. GitHub Gist: instantly share code, notes, and snippets. Returns a new CompletionStage that, when either this or the other given stage complete normally, is executed using this stage's default asynchronous execution facility, with the corresponding result as argument to the supplied action. See the CompletionStage documentation for rules covering exceptional completion.