layout: post title: 高级并发接口:future、promise、 package_task 和 async categories: cpp_concurrency description: C++并发编程简介 keywords: c++, 并发编程,std::future,std::package_task,std::promise,std::async 读写锁 使用promise获取异步结果 参考:C++11之获取线程返回值...
如果要使用std::async运行任务,就没有理由去创建std::package_task对象。因为std::async调用时,内部会创建一个基类为_Packaged_state类 “共享状态”的子类对象,而std::package_task也会创建_Packaged_state类的对象。可见std::async能够在调用任务执行之前就做到std::package_task能做到的任何事情,也可以避免重复创...
std::future<int> fu = std::async(std::launch::async,factorial, std::ref(f)); p.set_value(4); x= fu.get(); cout<<"result is"<< x <<endl; std::getchar();return0; } 有promise的情况下必须有setvalue;promise和future均不能被复制,只能被移动。 如果我们需要多个子线程执行一段代码,...
◆Params 启动任务执行的输入参数,比如HTTP请求的URL。 ◆Progress 后台任务执行的百分比。 ◆Result 后台执行任务最终返回的结果,比如String。 AsyncTask的执行分为四个步骤,每一步都对应一个回调方法,这些方法不应该由应用程序调用,开发者需要做的就是实现这些方法。 onPreExecute(), 该方法将在执行实际的后台操作前...
Features status getters to communicate the execution status, the ability to abort a pending execution, and the option to gracefully await the completion of an ongoing execution.", "repository": { "type": "git", "url": "git+https://github.com/ori88c/delayed-async-task.git" }, "...
IAsyncOperation<IReadOnlyList<StartupTask>> このメソッドが完了すると、現在のアプリ パッケージのすべてのスタートアップ タスクが返されます。 属性 RemoteAsyncAttribute 適用対象 製品バージョン WinRTBuild 14383, Build 15063, Build 16299, Build 17134, Build 17763, Build 18362, Build 1904...
"@react-native-async-storage/async-storage": "^1.17.10", "@react-native-community/cli-platform-ios": "^9.0.0", "@react-native-community/datetimepicker": "^8.2.0", "@react-native-community/netinfo": "^7.1.12", "@react-native-community/push-notification-ios": "^1.10.1", ...
AsyncGitOperationNotification AsyncRefOperationCommitLevelEventNotification AsyncRefOperationCompletedNotification AsyncRefOperationConflictNotification AsyncRefOperationGeneralFailureNotification AsyncRefOperationProgressNotification AsyncRefOperationTimeoutNotification Attachment Attachment Attachment AttachmentReference AttachmentType...
"Could not bulk load because SSIS file mapping object 'Global\DTSQLIMPORT' could not be opened. Operating system error code 5(Access is denied.). "COULD NOT FIND A PART OF PATH" WHILE EXECUTING PACKAGE THROUGH STORED PROCEDURE "Drop ...
"async-each": "1.0.1", "glob-parent": "2.0.0", "inherits": "2.0.3", "is-binary-path": "1.0.1", "is-glob": "2.0.1", "path-is-absolute": "1.0.1", "readdirp": "2.1.0" } }, "cliui": { "version": "2.1.0", "resolved": "https://registry.npmjs....