在《VC++深入详解》多线程源码上做了修订，因为若在VS2015上跑原书代码，效果并不明显，可能很多人从而对书本产生质疑。
CPU从以前的伪多线程进入真正的多线程时代，这些是书本作者“”孙鑫”没考虑到的。
上代码，原书开了2个线程，效果远远不如4个线程明显
SetEvent: 让事件有信号，这样WaitForSingleObject就不会阻塞线程
ResetEvent;让事件无信号，WaitForSingleObject会阻塞线程
CreateEvent:
第一个参数:安全属性，不用管设为NULL
第二个参数:是否手动Reset 如果是TRUE 那么WaitForSingleObject后事件保持原有受信状态， 如果是FALSE那么WaitForSingleObject后事件变成无信号状态
第三个参数:初始化事件状态，TRUE就能受信，FALSE就无信号
第四个参数：事件名称，可选，可以设为NULL
#include "stdafx.h" #include <windows.h> #include <iostream> static HANDLE s_hEvent; static int s_tickets = 100; DWORD WINAPI ThreadFun1(LPVOID lpParam) { while (true) { WaitForSingleObject(s_hEvent, INFINITE); //获得事件控制权 if (s_tickets > 0) { Sleep(1); std::cout << "--1 sell ticket : " << s_tickets-- << std::endl; SetEvent(s_hEvent); //这里让事件受信，让其它线程可以销售ticket } else break; } return 0; } DWORD WINAPI ThreadFun2(LPVOID lpParam) { while (true) { WaitForSingleObject(s_hEvent, INFINITE); if (s_tickets > 0) { Sleep(1); std::cout << "--2 sell ticket : " << s_tickets-- << std::endl; SetEvent(s_hEvent); } else break; } return 0; } DWORD WINAPI ThreadFun3(LPVOID lpParam) { while (true) { WaitForSingleObject(s_hEvent, INFINITE); if (s_tickets > 0) { Sleep(1); std::cout << "--3 sell ticket : " << s_tickets-- << std::endl; SetEvent(s_hEvent); } else break; } return 0; } DWORD WINAPI ThreadFun4(LPVOID lpParam) { while (true) { WaitForSingleObject(s_hEvent, INFINITE); if (s_tickets > 0) { Sleep(1); std::cout << "--4 sell ticket : " << s_tickets-- << std::endl; SetEvent(s_hEvent); } else break; } return 0; } int main() { HANDLE hThread1; HANDLE hThread2; HANDLE hThread3; HANDLE hThread4; s_hEvent = CreateEvent(NULL, FALSE, TRUE, _T("EventTest")) hThread1 = CreateThread(NULL, 0, ThreadFun1, NULL, 0, NULL); hThread2 = CreateThread(NULL, 0, ThreadFun2, NULL, 0, NULL); hThread3 = CreateThread(NULL, 0, ThreadFun3, NULL, 0, NULL); hThread4 = CreateThread(NULL, 0, ThreadFun4, NULL, 0, NULL); CloseHandle(hThread1); //这里不用对线程操作，所以可以先把句柄关闭，不然会产生内存泄漏，句柄的实质是结构体指针。 CloseHandle(hThread2); CloseHandle(hThread3); CloseHandle(hThread4); Sleep(4000); CloseHandle(s_hEvent); system("pause"); return 0; }
