Location of task swap on/off CPU for run que

I am trying to locate Linux's scheduler, and within there find the function that adds the next process to the run que (swaps control of the CPU). From looking around I "think" this would be sched.c , and I "think" that prepare_task_switch is this function based on its description, but I am not 100% sure. The overview definition makes sense, however I cannot seem to fin

任务交换开/关CPU运行队列的位置

我试图找到Linux的调度程序,并在那里找到将下一个进程添加到运行队列的功能(交换CPU的控制权)。 从环顾四周我“认为”这将是sched.c ,我“认为” prepare_task_switch是基于它的描述的这个函数,但我不是100%确定的。 概述的定义是有道理的,但是我似乎无法找到关于其内部方法的任何附加信息: fire_sched_out_preempt_notifiers(prev,next) , prepare_lock_switch(rq,next) , prepare_arch_switch(next) ,所以

Understanding discrepancy between POSIX and Linux/glibc sched

POSIX XSH 2.8.4 Process Scheduling defines the behavior of scheduling attributes for threads and processes. The sched_* interfaces are specified to affect the scheduling properties of the process, not the thread. This is clarified in the following passages: The POSIX model treats a "process" as an aggregation of system resources, including one or more threads that may be scheduled b

了解POSIX和Linux / glibc调度之间的差异

POSIX XSH 2.8.4进程调度定义线程和进程的调度属性的行为。 sched_*接口被指定为影响进程的调度属性,而不是线程。 这在下面的段落中得到澄清: POSIX模型将“进程”视为系统资源的集合,包括可由操作系统在其控制的处理器上调度的一个或多个线程。 尽管一个进程具有自己的一组调度属性,但它们对各个线程的调度行为有间接影响(如果有的话),如下所述。 和 对于具有系统调度竞争范围的线程,进程调度属性不应该对线程或

How to use the watchdog timer in a RTOS?

Assume I have a cooperative scheduler in an embedded environment. I have many processes running. I want to utilize the watchdog timer so that I can detect when a process has stopped behaving for any reason and reset the processor. In simpler applications with no RTOS I would always touch the watchdog from the main loop and this was always adequate. However, here, there are many processes tha

如何在RTOS中使用看门狗定时器?

假设我在嵌入式环境中有一个合作调度程序。 我有很多进程在运行。 我想利用看门狗定时器,这样我就可以检测到某个进程因任何原因而停止运行并重置处理器。 在没有实时操作系统的简单应用程序中,我会始终触摸主循环中的看门狗,这样总是足够的。 但是,在这里,有很多可能会挂起的进程。 定期触摸看门狗定时器,同时确保每个进程处于良好状态的干净方法是什么? 我在想,我可以为每个进程提供一个回调函数,以便它可以让

Returning data from database in .net: Return a DataTable or LIst<T>?

I'm struggling with bridging the concepts of good database design with good object orientated design. Traditionally if I wanted to display a list of news stories in a repeater, I would use something like: <script runat="server"> void ShowNews() { rptNewsStories.DataSource = News.GetAllNews(); // Returns a DataTable rptNewsStories.DataBind(); } </scrip

在.net中从数据库返回数据:返回一个DataTable或LIst <T>?

我很努力地将良好的数据库设计理念与良好的面向对象的设计结合起来。 传统上,如果我想在中继器中显示新闻故事列表,我会使用类似以下内容的内容: <script runat="server"> void ShowNews() { rptNewsStories.DataSource = News.GetAllNews(); // Returns a DataTable rptNewsStories.DataBind(); } </script> <asp:Repeater id="rptNewsStories" runat="server"> <

Is there anything to change the exports name mangling scheme in GCC?

I'm trying to build a project I have and it has several exported functions. The functions follow the stdcall convention and they get mangled if compiled with GCC as Func@X Other compilers mangle the name like this: _Func@X Is any way I can force GCC to mangle the names of the exported functions to the later example? See this answer. int Func() __asm__("_Func@X"); This will force GCC

GCC中有没有什么可以改变出口名称修改方案?

我试图建立一个我有的项目,它有几个导出的函数。 这些函数遵循stdcall惯例,如果使用GCC编译,它们会被破坏 Func@X 其他编译器像这样改变名称: _Func@X 有什么办法可以强制GCC将导出函数的名称改为后面的例子吗? 看到这个答案。 int Func() __asm__("_Func@X"); 这将强制GCC命名符号_Func@X而不管它通常会做什么。 哦,对, @是特殊的:它用于符号版本控制。 我以为__asm__("...@...")曾经工作过,但我

excellent setjmp/longjmp tutorials

Hi I'd like to read good tutorials on setjmp/longjmp in C. It'd be better if there're examples which are real rather than artificial. Thanks. 这不是一本真正的教程,但libpng文档描述了库如何使用setjmp / longjmp来执行错误处理。 The book "C interfaces and implementation" explains the concept well and implements a usable "exception" simulation in C using these const

优秀的setjmp / longjmp教程

您好,我想阅读关于C语言中setjmp / longjmp的优秀教程。如果存在真实而非人为的示例,那会更好。 谢谢。 这不是一本真正的教程,但libpng文档描述了库如何使用setjmp / longjmp来执行错误处理。 本书“C接口和实现”很好地解释了这个概念,并使用这些结构在C中实现了一个可用的“异常”模拟。 它的代码(第4章)可以在这里免费获得。 编辑:也看到这个SO线程 然后,您应该阅读UNIX(R)环境(第二版)中的高级编程。以下是您

How do I use extern to share variables between source files?

I know that global variables in C sometimes have the extern keyword. What is an extern variable? What is the declaration like? What is its scope? This is related to sharing variables across source files, but how does that work precisely? Where do I use extern ? Using extern is only of relevance when the program you're building consists of multiple source files linked together, where s

如何使用extern在源文件之间共享变量?

我知道C中的全局变量有时会有extern关键字。 什么是extern变量? 什么是宣言? 它的范围是什么? 这与在源文件中共享变量有关,但它是如何精确地工作的? 我在哪里使用extern ? 使用extern ,只有当您正在构建的程序由多个源文件链接在一起时才相关,其中一些定义的变量(例如,源文件file1.c需要在其他源文件(如file2.c引用) file2.c 。 理解定义变量和声明变量之间的区别非常重要: 当编译器被告知存在一个变量

Why are WMI Queries so slow sometimes?

I am using System.Management namespace in a .Net to execute various WMI queries against a remote server. In my logs I can see that sometimes the queries take 30 or 40 seconds to complete while other times the queries complete in less than a second. When I see these slow queries, I try to connect to the box using wbemtest, but it always connects and executes the query quickly. Any ideas, poin

为什么WMI查询有时很慢?

我在.Net中使用System.Management命名空间来对远程服务器执行各种WMI查询。 在我的日志中,我可以看到有时查询需要30或40秒才能完成,而其他时间查询在不到一秒钟内完成。 当我看到这些慢速查询时,我尝试使用wbemtest连接到该框,但它总是快速连接并执行查询。 任何想法,指针,建议? 在反射器中查看System.Management.ManagementScope时,我注意到它似乎泄漏了IWbemServices指针。 它看起来像是一个COM接口,需要在其

How to handle nested datacontext in the BL?

public class TestBL { public static void AddFolder(string folderName) { using (var ts = new TransactionScope()) { using (var dc = new TestDataContext()) { var folder = new Folder { FolderName = folderName }; dc.Folders.InsertOnSubmit(folder); dc.SubmitChanges(); AddFile("test1.xyz", fo

如何处理BL中的嵌套数据上下文?

public class TestBL { public static void AddFolder(string folderName) { using (var ts = new TransactionScope()) { using (var dc = new TestDataContext()) { var folder = new Folder { FolderName = folderName }; dc.Folders.InsertOnSubmit(folder); dc.SubmitChanges(); AddFile("test1.xyz", fo

Allow an infrared device to send a signal to control the monitor of a PC

I have a monitor which can be used also as television (it has a DVI-D connector AND a cable connector.) And for a while I have an infrared device on my computer which I use to synchronize my PDA and mobile phone. I want the infrared/irDA device of my PC to send a signal to my monitor to switch between TV and PC mode. (Or to control the monitor in some other way, like turning it on and off duri

允许红外设备发送信号来控制PC的显示器

我有一台也可以用作电视机的显示器(它有一个DVI-D连接器和一个电缆连接器)。有一段时间,我的电脑上有一个红外设备,用于同步我的PDA和手机。 我想让我的电脑的红外/ irDA设备发送一个信号给我的显示器在电视和PC模式之间切换。 (或以其他方式控制显示器,例如在登录/注销过程中打开或关闭显示器。)要做到这一点,我需要: 使用PC设备记录来自我的显示器遥控器的命令。 从我的电脑向我的显示器重复该信号以发送命令。