Windows平台下的多线程编程(计算机论文翻译).doc
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1、附录AUnder theWindowsplatform, multi-threaded programmingA thread is a process execution path, it contains separate stack andCPUregister state, the process of each thread to share all resources, including open files, signal identification and dynamic allocation of memory and so on.All threads within a
2、 process using the same address space, and these threads of execution by the system scheduler control thread scheduler to decide which and when to execute the executable threads.Thread has priority, lower priority thread must wait until the higher priority thread after their implementation.In the mu
3、lti-processor machines, the scheduler can be multiple threads running up into different processors, it will give the processor the task balance, and improve efficiency of the system.Windowsis a multitasking operating system, a process inWindowscontains one or more threads.32-bit WindowsenvironmentWi
4、n32 APIprovides a multi-threaded application development interface functions required, and use of VC in the standard C libraries are also provided to develop multithreaded applications, the corresponding MFC class library encapsulates the class of multi-threaded programming users in the development
5、can be based on the needs and characteristics of the application select the appropriate tool.In order so that we can fully understand theWindowsmulti-threaded programming techniques, this article will focus onWin32 APIandMFCare two ways of how to prepare multi-threaded programs.Multithreaded Program
6、ming inWin32andMFCclass library under way to support the principle is the same, the main thread of the process at any time needed to create a new thread.When the thread has finished, automatically terminate the thread; when the process is complete, all threads are terminated.Threads share the proces
7、s of all activities of resources, therefore, be considered when programming multiple threads access the same resource conflict problem.When a thread is accessing a process object, and another thread to change the object, it may produce incorrect results, programming to solve this conflict.Under the
8、multi-threadedWin32 APIprogramming:Win32 APIis theWindowsoperating system kernel and the interface between applications, which will provide the functions of the kernel function wrapper, the application obtained by calling the correlation function of the corresponding system function.In order to prov
9、ide multi-threading applications,Win32 APIfunction provides some focus on procedures for handling multi-threaded set of functions.Directly with theWin32 APIto program design has many advantages: Win32-based application code execution is small, high efficiency, but it requires programmers to write co
10、de more, and all systems need to manage the resources available to the program.Programming with theWin32 APIdirectly on theWindowssystem kernel programmer is required to have a certain understanding, it will take a lot of time on the programmer to manage system resources, thus reducing the efficienc
11、y of the programmer.1.With theWin32function to create and terminate threadsWin32function library provides a function of multi-threaded operation, including creating threads, terminate threads, the establishment of exclusive zones.In the applications main thread or other activities to create a new th
12、read thread function is as follows:HANDLE CreateThread(LPSECURITY_ATTRIBUTES lpThreadAttributes,DWORDdwStackSize,LPTHREAD_START_ROUTINElpStartAddress,LPVOIDlpParameter,DWORDdwCreationFlags,LPDWORDlpThreadId);HANDLE CreateThread (LPSECURITY_ATTRIBUTES lpThreadAttributes, DWORD dwStackSize, LPTHREAD_S
13、TART_ROUTINE lpStartAddress, LPVOID lpParameter, DWORD dwCreationFlags, LPDWORD lpThreadId);If you create a successful thread handle is returned, otherwise NULL.Create a new thread, the thread started to execute.However, if used indwCreationFlags CREATE_SUSPENDEDproperty, then the thread is not imme
14、diately executed, but the first suspended, until the calls started afterResumeThreadthreads in the process can call the following function to set the priority of the thread:BOOL SetThreadPriority(HANDLE hThread,intnPriority);BOOL SetThreadPriority (HANDLE hThread, intnPriority);When the function ret
15、urns the calling thread, the thread automatically terminates.If you need to terminate during the execution of the thread can call the function:VOID ExitThread(DWORD dwExitCode);VOID ExitThread (DWORD dwExitCode);If you terminate a thread in the thread on the outside, you can call the following funct
16、ion:BOOL TerminateThread(HANDLE hThread,DWORDdwExitCode);BOOL TerminateThread (HANDLE hThread, DWORD dwExitCode);It should be noted: this function may cause system instability, and the thread does not release the occupied resources.Therefore, under normal circumstances, it is recommended not to use
17、this function.If you want to terminate the thread is the last thread within the process, the thread is terminated after the corresponding process should be terminated.2.Thread synchronizationIn the thread body, if the thread is completely independent data access with other threads and other resource
18、s without conflict operation, the method can be carried out in accordance with generally single-threaded programming.However, the situation in multi-threaded processing is often not the case, often between threads simultaneously access some resources.Because access to shared resources causes conflic
19、t is inevitable, in order to address this thread synchronization problems,Win32 APIprovides a variety of synchronization objects to help programmers access to shared resources to resolve the conflict.In presenting these synchronization objects introduce wait functions before, because all the control
20、 objects access control should use this function.Win32 APIprovides a set of threads can block waiting for the implementation of its own function.These functions in its argument object generates one or more synchronization signal, or exceeds the waiting time will be returned.Waiting function is not r
21、eturned, the threads in a wait state, when the thread consumes very littleCPUtime.Not only can guarantee the wait function using thread synchronization, but also can improve the running efficiency.Waiting function is the most commonly used:DWORD WaitForSingleObject(HANDLE hHandle,DWORD dwMillisecond
22、s);DWORD WaitForSingleObject (HANDLE hHandle, DWORD dwMilliseconds);The function can be used to simultaneously monitor multipleWaitForMultipleObjectsynchronization object, the function is declared as:DWORD WaitForMultipleObject(DWORD nCount,CONST HANDLE *lpHandles,BOOLbWaitAll,DWORDdwMilliseconds);D
23、WORD WaitForMultipleObject (DWORD nCount, CONST HANDLE * lpHandles, BOOL bWaitAll, DWORD dwMilliseconds);(1)mutex objectMutexstate of the object by any thread in that it does not have a time signal, it was a time when no signal.Mutexobjects are suitable for coordination of multiple threads exclusive
24、 access to shared resources.The following steps can use the object:First, create a mutex object, get the handle:HANDLE CreateMutex();HANDLE CreateMutex ();Then, in the thread before the possible areas of conflict (ie, before access to shared resources) calls WaitForSingleObject, the handle to the fu
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