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WIN 多线程API 一 简单实例 比较简单的代码创建10个线程其中使第4个线程在一创建就挂起等到其他的线程执行的差不多的时候再使第4个线程恢复执行。 #include stdio.h #include stdlib.h #include windows.h #define THREAD_NUM 10 DWORD WINAPI PrintThreads (LPVOID); int main () { HANDLE hThread[THREAD_NUM]; DWORD dwThreadID[THREAD_NUM]; for (int i0; iTHREAD_NUM; i) { int isStartImmediate 0; if(3 i) isStartImmediate CREATE_SUSPENDED; hThread[i]CreateThread(NULL, // security attributes that should be applied to the new thread, // this is for NT. Use NULL to get the default security attributes. Use NULL for win95 0, // default size of 1MB can be passed by passing zero. PrintThreads, // function name:address of the function where the new thread starts. (LPVOID)i, // parameter(void pointer): pointer to the 32 bit parameter that will be passed into the thread isStartImmediate, // flags to control the creation of the thread. Passing zero starts the thread immediately. // Passing CREATE_SUSPENDED suspends the thread until the ResumeThread( ) function is called. dwThreadID[i] // pointer to a 32-bit variable that receives the thread identifier. ); if (hThread[i]) { printf (Thread launched successfully/n); } } printf(Start sleep 100, and let other thread excute/n); Sleep (100); printf(Start sleep 100, and thread 3 excute/n); ResumeThread(hThread[3]); Sleep(100); for(int i 0; iTHREAD_NUM; i) { if (hThread[i]) { CloseHandle(hThread[i]); // You need to use this to release kernel objects when you are done using them. // If a process exits without closing the thread handle, // the operating system drops the reference counts for those objects. // But if a process frequently creates threads without closing the handles, // there could be hundreds of thread kernel objects lying around and these resource leaks can have a big hit on performance. } } return (0); } //function PrintThreads DWORD WINAPI PrintThreads (LPVOID num) { for (int i0; i10; i) printf (Thread Number is %d%d%d/n, num,num,num); return 0; } 二 其他基本API的说明 CreateThread() 调用成功返回句柄和一个id。 CloseHandle() 关闭一个打开的对象句柄该对象句柄可以是线程句柄也可以是进程、信号量等其他内核对象的句柄. SuspendThread(HANDLE) 允许开发人员将HANDLE指定的线程挂起如果要挂起的线程占有共享资源则可能导致死锁。 ResumeThread(HANDLE) 恢复指定的线程。 TerminateThread() 立即终止线程的工作不做任何清理工作。 ExitThread() 线程函数返回时回调用次函数所以一般我们不去显示的调用。 ExitThread是推荐使用的结束一个线程的方法当调用该函数时当前线程的栈被释放然后线程终止相对于TerminateThread函数来说这样做能够更好地完成附加在该线程上的DLL的清除工作. 但是ExitThread()会导致线程在清处构造器/自动变量之前就终止所以我们最好不要显示的调用ExitThread()。
