Win10下多线程中访问公共变量时，可使用mutex类来做，头文件为mutex，实例（VS2013）：
#include <iostream> #include <thread> #include <Windows.h> #include <mutex> using namespace std; mutex mu; //线程互斥对象 int totalNum = 100; void thread01() { while (totalNum > 0) { mu.lock(); //同步数据锁 cout << totalNum << endl; totalNum--; Sleep(100); mu.unlock(); //解除锁定 } } void thread02() { while (totalNum > 0) { mu.lock(); cout << totalNum << endl; totalNum--; Sleep(100); mu.unlock(); } } int main() { thread task01(thread01); thread task02(thread02); task01.detach(); task02.detach(); system("pause"); }输出：
若不加互斥，如下屏蔽：
#include <iostream> #include <thread> #include <Windows.h> #include <mutex> using namespace std; mutex mu; //线程互斥对象 int totalNum = 100; void thread01() { while (totalNum > 0) { // mu.lock(); //同步数据锁 cout << totalNum << endl; totalNum--; Sleep(100); // mu.unlock(); //解除锁定 } } void thread02() { while (totalNum > 0) { // mu.lock(); cout << totalNum << endl; totalNum--; Sleep(100); // mu.unlock(); } } int main() { thread task01(thread01); thread task02(thread02); task01.detach(); task02.detach(); system("pause"); }可看到，有丢失，有重复的现象出现：
参考网址
还可使用如下方法，用WaitForSingleObject和ReleaseMutex：
#include <iostream> #include <windows.h> using namespace std; DWORD bRet; HANDLE hMutex = NULL; DWORD WINAPI Fun(LPVOID lpParamter) { for (int i = 0; i < 10; i++) { bRet = WaitForSingleObject(hMutex, INFINITE); if (bRet == WAIT_OBJECT_0) { // printf("Process is signaled...:%d\n", GetLastError()); } else if (bRet == WAIT_TIMEOUT) { // printf("Time out...:%d\n", GetLastError()); } else if (bRet == WAIT_FAILED) { // printf("Invalid process handle...:%d\n", GetLastError()); } cout << "A Thread Display!" << endl; ReleaseMutex(hMutex); Sleep(100); } return 0L; } int main() { hMutex = CreateMutex(NULL, FALSE, NULL); HANDLE hThread = CreateThread(NULL, 0, Fun, NULL, 0, NULL); CloseHandle(hThread); for (int i = 0; i < 10; i++) { WaitForSingleObject(hMutex, INFINITE); cout << "Main Thread Display!" << endl; ReleaseMutex(hMutex); Sleep(200); } system("PAUSE"); return 0; } 结果：
