windows多线程编程

进程:一个运行的程序,内存,cpu时间等都归进程所有.

线程:cpu调度的最小单位,一个进程内的多个线程共享4G内存.程序的一个执行路径

1.最基础的使用方法.

CreateThread,ExitThread,CloseHand

#include <iostream>#include <process.h>//CreateThread,ExitThread,CloseHandle#include <windows.h>#include <stdio.h>BOOL repeat = TRUE;DWORD WINAPI MyThread1(LPVOID lpParameter){while (repeat){printf("how are you?\n");Sleep(1);}DWORD exitCode;ExitThread(exitCode);return 0;}DWORD WINAPI MyThread2(LPVOID lpParameter){while (repeat){printf("very well\n");Sleep(1);}DWORD exitCode;ExitThread(exitCode);return 0;}DWORD WINAPI KillThread(LPVOID lpParameter){repeat = FALSE;return 0;}int main(){HANDLE handle1, handle2, handle3;DWORD dw1, dw2, dw3;handle1 = CreateThread(NULL, 0, MyThread1, NULL, 0, &dw1);if (handle1 == NULL){printf("creat thread1 failed!\n");return -1;}handle2 = CreateThread(NULL, 0, MyThread2, NULL, 0, &dw2);if (handle2 == NULL){printf("creat thread2 failed!\n");return -1;}Sleep(1000);handle3 = CreateThread(NULL, 0, KillThread, NULL, 0, &dw3);if (handle3 == NULL){printf("creat thread3 failed!\n");return -1;}CloseHandle(handle1);CloseHandle(handle2);CloseHandle(handle3);return 0;}

vc多线程的编译需要设置,c/c++的code generation的use run-time library 选择Multithread;

CreateRemoteThread函数在别的进程中创建一个线程

SuspendThread(HANDLE),RssumeThread(HANDLE)暂停和重启一个线程.

#include <iostream>#include <process.h>//CreateThread,ExitThread,CloseHandle#include <windows.h>#include <stdio.h>///////////////////////////////////////////////////////////////////////////////////////////////////////suspend resume 的使用/////////////////////////////////////////////////////////////////////////////////////////////////////DWORD WINAPI myThread(void*){for (int i = 0; i < 100; i++){printf("Hello,everyone!\n");Sleep(100);}return 0;}int main(){HANDLE handle;if ((handle = CreateThread(NULL, 0, myThread, NULL, 0, NULL)) == NULL)printf("create thread failed\n");Sleep(100);for (int i = 0; i < 10; i++){printf("***now suspend***\n");SuspendThread(handle);for (int i = 0; i < 3; i++){printf("Good thanks\n");Sleep(100);}printf("***resume***\n");ResumeThread(handle);Sleep(300);}
}
TerminateThread(HANDLE,DWORD)第二个参数为退出码.用于终止一个线程
这个函数非常的危险,立即终止了线程,会造成分配的堆栈没有释放,一般不用.
#include <iostream>#include <process.h>//CreateThread,ExitThread,CloseHandle#include <windows.h>#include <stdio.h>///////////////////////////////////////////////////////////////////////////////////////////////////////suspend resume 的使用/////////////////////////////////////////////////////////////////////////////////////////////////////DWORD WINAPI myThread(void*){for (int i = 0; i < 100; i++){printf("Hello,everyone!\n");Sleep(100);}return 0;}int main(){HANDLE handle;if ((handle = CreateThread(NULL, 0, myThread, NULL, 0, NULL)) == NULL)printf("create thread failed\n");Sleep(100);printf("***terminate****\n");TerminateThread(handle, 3);Sleep(1000);CloseHandle(handle);return 0;}
CloseHandle(handle);
return 0;
}
GetExitCodeThread(HANDLE,lpDWORD)第二个用于保存exitcode
#include <iostream>#include <process.h>//CreateThread,ExitThread,CloseHandle#include <windows.h>#include <stdio.h>using namespace std;///////////////////////////////////////////////////////////////////////////////////////////////////////getcurrentthread   getexitcodeThread 的使用/////////////////////////////////////////////////////////////////////////////////////////////////////DWORD WINAPI myThread(void*){Sleep(1000);std::cout << "current thread id:" << GetCurrentThreadId() << std::endl;return 3;}int main(){HANDLE handle;DWORD dw;if ((handle = CreateThread(NULL, 0, myThread, NULL, 0, &dw)) == NULL)printf("create thread failed\n");cout << "create thread id:" << dw << endl;Sleep(1000);GetExitCodeThread(handle, &dw);cout << "thread exit with " << dw << endl;}


                                             
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