Std future wait for
WebThe creator of the asynchronous operation can then use a variety of methods to query, wait for, or extract a value from the std::future. These methods may block if the asynchronous operation has not yet provided a value. Web线程支持库 std::future 类模板 std::future 提供访问异步操作结果的机制： （通过 std::async 、 std::packaged_task 或 std::promise 创建的）异步操作能提供一个 std::future 对象给该异步操作的创建者。 然后，异步操作的创建者能用各种方法查询、等待或从 std::future 提取值。 若异步操作仍未提供值，则这些方法可能阻塞。 异步操作准备好发送结果给创建者 …
Std future wait for
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WebSep 12, 2024 · Once you use the get () function on a future, it will wait until the result is available and return this result to you once it is. The get () function is then blocking. Since the lambda, is a void lambda, the returned future is of type std::future and get () returns void as well. Webstd:: future ::wait_until template future_status wait_until (const chrono::time_point& abs_time) const; Wait for ready until time point Waits for the shared state to be ready, at most until abs_time.
Webstd::future:: wait_for C++ Concurrency support library std::future Waits for the result to become available. Blocks until specified timeout_duration has elapsed or the result becomes available, whichever comes first. The return value identifies the state of the result. Std - std::future::wait_for - cppreference.com WebFeb 16, 2016 · In the code above, the waiting for the computation thread to finish happens when we call get () on the future. I like how the future decouples the task from the result. In more complex code, you can pass the future somewhere else, and it encapsulates both the thread to wait on and the result you'll end up with.
Web线程支持库 std::future wait_until 等待结果变为可用。 它阻塞直至抵达指定的 timeout_time ，或结果变为可用，两者的先到来者。 返回值指示 wait_until 为何返回。 若调用此函数前 valid() == false 则行为未定义。 参数 timeout_time - 要阻塞到的最大时间点 返回值 异常 时钟、时间点或时长在执行中可能抛的任何异常（标准库提供的时钟、时间点和时长决不抛 … Web线程支持库 std::condition_variable 1) 原子地释放 lock ，阻塞当前线程，并将它添加到等待在 *this 上的线程列表。 线程将在执行 notify_all () 或 notify_one () 时，或度过相对时限 rel_time 时被解除阻塞。 它亦可被虚假地解除阻塞。 解阻塞时，无关缘由，重获得 lock 并退出 wait_for () 退出。 若此函数通过异常退出，则亦重获得 lock 。 (C++14 前) 2) 等价于 return …
WebDec 11, 2014 · A normal std::future is not threadsafe by itself. So yes it is UB, if you call modifying functions from multiple threads on a single std::future as you have a potential …
WebReturns whether the future object is currently associated with a shared state. For default-constructed future objects, this function returns false (unless move-assigned a valid future). Futures can only be initially constructed with valid shared states by certain provider functions, such as async, promise::get_future or packaged_task::get_future. Once the … midsouth electric coopWeb3 hours ago · My question is really whether I explicitly invoke client.close() or let the destructor handle it , the problem remains that my thread never returns after m_socket.close(boost::beast::websocket::close_code::normal); By doing a bit of debugging I see that the websocket client is waiting to receive a close header message from the … news yyWebActually, get () calls std::future::wait () until the return value is available, so you can also use wait () if you don't want to explicitly retrieve the value as soon as it is ready. Note that next to giving a promise a value, you can also give it an exception. newsy youtubeWebstd::future::wait_for template< class Rep, class Period > std::future_status wait_for ( const std::chrono::duration& timeout_duration ) const; (since C++11) Waits … midsouth electric cooperativeWebThese are the top rated real world C++ (Cpp) examples of std::future::wait_for extracted from open source projects. You can rate examples to help us improve the quality of … mid south electric cooperative associationWeb相反，它会在当前线程中不断循环，检查用户提交的future是否准备就绪; 当 Tokio 运行时线程到达这一点时，它会立即yield自己，直到用户的未来准备就绪并将其取消停放。另一方面，用户的future是同一个线程执行的，这个线程还在parking，那么就造成了死锁。 newszap obituaries delaware state newsWebAug 20, 2012 · The call to future::wait_for () always returns future_status::deferred. If I remove the wait_for and instead loop for some fixed number of iterations with a sleep_for in the while loop I can get () the future as expected and the function exits normally. Am I misunderstanding the correct usage of wait_for ()? newszaland time now