多线程序访问数据库

基于三级反馈队列调度算法的UNIX进程管理程序模拟-Feedback queue scheduling algorithm based on three of the UNIX process management program to simulate

windows任务管理器都无法结束其进程，看下这是如何做到的-windows task manager will not be able to end the process, facie this is the way to do

实现简单的系统进程管理。可察看当前系统中正在运行的进程，进程的基本信息。（如：进程大小、线程ID等)可终止某一进程。-simple realization of a systematic process management. Can see the current system running processes, the process of basic information. (Eg : Process size, thread ID, etc.) may terminate a process.

多线程方式同时进行多项任务，让多个任务同时进行，控制线程的运行。-multiple threads simultaneously a number of tasks so that multiple tasks simultaneously, control threads running.

这是大学上操作系统做的实验,相信很多人都可用的着!本实验模拟单处理器系统的进程调度，采用时间片轮转调度算法作为进程调度算法。-this is the operating system on the university to do experiments, I believe many people are available to! Experimental simulation of the single-processor system in the process scheduling, time-use Web-scheduling algorithm as process scheduling algorithm.

program VirtualMemory {$APPTYPE CONSOLE} uses SysUtils, Windows const PageSize = 4096 //定义页面大小 var VmAddress, CommitAddress: Pointer //存放虚拟内存基址 Text: Pchar begin //保留二页虚拟内存 VmAddress := VirtualAlloc(nil, PageSize * 2, MEM_RESERVE, PAGE_READWRITE) if not Assigned(VmAddress) then begin WriteLn( 保留虚拟内存失败! ) ExitProcess(0) end else WriteLn(Format( 保留虚拟内存成功, 基址为:[%8.8x]! , [Longint(VmAddress)])) //提交第二页虚拟内存 CommitAddress := Pointer(Longint(VmAddress) + PageSize) CommitAddress := VirtualAlloc(CommitAddress, PageSize, MEM_COMMIT, PAGE_READWRITE) if not Assigne-program VirtualMemory ($ APPTYPE CONSOLE) uses SysUtils, Windows const PageSize = 4096// definition pages size var VmAddress, CommitAddress : Pointer// virtual memory-based storage site Text : Pchar begin// reservations two virtual memory VmAddress : = VirtualAlloc (nil. PageSize* 2, MEM_RESERVE, PAGE_READWRITE) if not Assigned (VmAddress) then begin WriteLn (reservations virtual memory failure!) ExitProcess (0) end else WriteLn (Format

　一般而言,应用程序中的一个次要线程总是为主线程执行特定的任务,这样,主线程和次要线程间必定有一个信息传递的渠道,也就是主线程和次要线程间要进行通信。这种线程间的通信不但是难以避免的，而且在多线程编程中也是复杂和频繁的，下面将进行说明。-Generally speaking, the application of a secondary thread is always the main thread to perform a specific task, so that main thread and secondary threads must have a channel for the transmission of information, which is the main thread and the secondary thread to communicate between. This inter-thread communication is not only inevitable, but also in multi-threaded programming is complex and frequent, the following description will be carried out.

MThreadVB 多线程技术，VB也可以多线程。-MThreadVB multi-threading technology, VB can also be multi-threaded.

关于多线程的一个程序，主要是说明同步技术在多线程中的应用。-On a multi-threaded program, mainly that synchronous technology in multi-threaded applications.

VB关闭冰刃的代码，是学习进程的不错例子。-VB code to close冰刃is a good example of the learning process.