fds dispatch

A dispatch group allows an organization thread to know that one or more tasks are completed. If you have a scenario where the main thread should not continue to run until the task in the queue is finished, you can use dispatch group technology to have one or more queues wait for the execution to complete before returning to the main thread. The following example shows the basic usage of creating a

I. ConceptsStatic Dispatch occurs during the compilation period. The assignment is based on the Static type information, and the method overload is Static assignment.Dynamic Dispatch (Dynamic Dispatch) occurs during the running period. Dynamic Dispatch dynamically replaces a method. Object-oriented languages use dynami

One, the implementation of the Dispatch queue:1, used to manage the FIFO queue implemented by the C language layer of the appended block.A lightweight signal for exclusive control implemented in the 2,atomic function.3, some containers that are implemented by the C language layer for managing threads.Second, the benefits of CGD.No matter how hard programmers try to write code that manages threads, it is not possible to outperform the GCD implemented a

Abstract state machine class QFSM or QHSM has a function pointer that points to the specific state function in the inherited state machine class, which has two interface function init () and dispatch (), which works by understanding the key of the state machine handling event process.The State machine class inherits from QFSM or QHSM, and inherits this function pointer, which is used to dynamically point to the private state function in the specific s

based on the new URL. There is a typical feature of redirection, that is, when a request is redirected, the URL displayed on the browser is often no longer the one requested at the beginning. This is the origin of redirection. A typical application of HTTP redirection is to prevent repeated submission of forms. The principle is: if a user information editing page is used, the form is submitted to saveuser through post. action. After the request is submitted, a redirected response can be returne

Java design pattern (3) Visitor pattern and Application in Multi-Dispatch scenariosThe basic concept of Visitor encapsulates operations that act on each element in the data structure. Different operations can be implemented with the help of the new visitor, reducingCouplingVisitors canData StructureAndData OperationsDecoupling makes it unnecessary to modify the data structure or modify the original operation for the added operations on the data struct

in entry. S in:......Ret_from_exception: #从异常中返回的入口Preempt_stop #解释为 CLI, off interrupt, which is not allowed to be preempted during return from exceptionRET_FROM_INTR: #从中断返回的入口Get_thread_info (%EBP) #取task_struct的thread_info信息MOVL eflags (%ESP),%eaxMovb CS (%ESP),%alTestl $ (Vm_mask | 3),%EAXJZ Resume_kernel # "Return to User state" and "return in nuclear mentality" junctionENTRY (Resume_userspace)CliMOVL ti_flags (%EBP),%ecxAndl $_tif_work_mask,%ECX #(_tif_notify_resume | _tif_sigpending#| _

Design Summary Network Office is the trend of modern enterprise development. This paper mainly expounds the function module of the transceiver management system based on B/s structure and how to use ASP and SQL Server to solve some related technologies, including the security of the system. Keywords network office; b/S structure; receipt and dispatch management system; ASP technology; security Introduction Traditional manual Office is unable to mee

-- Java training, Android training, iOS training,. NET training , look forward to communicating with you! --1. understand the work flow and principle of the Bank business Dispatch systemThere are three kinds of windows in the bank, one is the ordinary window, one is the VIP window, one is the Quick window, all the customers are queued, and when the VIP window or Quick window is idle, it can serve the normal window.2. Project requirements for the banki

Introduction to PHP microframework Dispatch. Dispatch is a small PHP framework. It does not give you complete MVC settings, but you can define URL rules and methods to better organize applications. This is a small PHP Framework for API, simple site, or prototype. It does not give you complete MVC settings, but you can define URL rules and methods to better organize applications. This is perfect for APIs, si

PurposeThis document describes a pluggable FairScheduler scheduler for Hadoop, agreeing that YARN applications share resources fairly in a large cluster.Simple IntroductionFair scheduling is a method of allocating resources to applications. So that in the end, all applications on average get equal resources. Hadoop NextGen can dispatch multiple types of resources. By default, Fair Scheduler only makes a fair scheduling decision based on memory. The me

Coverage: wndproc Unit unit1; interfaceuses windows, messages, sysutils, variants, classes, graphics, controls, forms, dialogs; Type tform1 = Class (tform) protected procedure wndproc (VAR message: tmessage ); override; end; var form1: tform1; implementation {$ R *. DFM} procedure tform1.wndproc (VAR message: tmessage); begin inherited; If message. MSG = wm_lbuttondown then showmessage ('wndproc'); end. Overwrite: Dispatch Unit unit1; inte

First, introduce several concepts: GCD, queue, serial, parallel, synchronous, asynchronous. GCD (Grand Central Dispatch ): The Great Apple developed a multi-core multi-thread solution. Is a C language-based underlying API Defining tasks with blocks is flexible and convenient to use. Provides more control capabilities and underlying functions not available in the Operation queue The basic idea of GCD is to put the operation s

,%%esp/n" : "=a" (arg1), "=d" (arg2), "=b" (ISP) : "0" (IRQ), "1" (DESC), "2" (ISP), "D" (DESC->HANDLE_IRQ) : "Memory", "CC", "ecx"); return 1; } Finally, consider the question in the title:why the Linux kernel cannot sleep/dispatch within the interrupt pathLinux is a process-based scheduling unit, and the scheduler only sees the process kernel stack, and the interrupt stack is not visible. In the standalone interrupt stack mode, if

1.Django CBV in the request after the arrival of the implementation of the dispatch method, dispatch method according to the request mode of triggering get/post/put and other methodsclassApiview (View):defDispatch (self, request, *args, * *Kwargs):#1.1 encapsulating the request of WsgiRequest = Self.initialize_request (Request, *args, * *Kwargs) Self.request= Request#the self.request at this time is the req