對closehandle()的疑惑終於弄明白了

首先看code（vs 2008下編譯通過）：

// ThreadPriority.cpp : Defines the entry point for the console application. // #include "stdafx.h" #include <Windows.h> DWORD WINAPI ThreadIdle(LPVOID lpParam) { int i = 0; while(i < 10) { printf("Idle thread running, count = %d/n", i++); } return 0; } DWORD WINAPI ThreadNormal(LPVOID lpParam) { int i = 0; while(i < 10) { printf("Normal thread running, count = %d/n", i++); } return 0; } int _tmain(int argc, _TCHAR* argv[]) { HANDLE h[2]; DWORD dwThreadID; h[0] = ::CreateThread(NULL, NULL, ThreadIdle, NULL, CREATE_SUSPENDED, &dwThreadID); ::SetThreadPriority(h[0], THREAD_PRIORITY_IDLE); ::ResumeThread(h[0]); h[1] = ::CreateThread(NULL, NULL, ThreadNormal, NULL, 0, &dwThreadID); //::WaitForMultipleObjects(2, h, TRUE, INFINITE);. DWORD dw = ::WaitForMultipleObjects(2, h, FALSE, 0); switch (dw) { case WAIT_FAILED: printf("wait failed!/n"); break; case WAIT_TIMEOUT: printf("wait timeout!/n"); break; case WAIT_OBJECT_0+0: printf("HANDLE h[0] is running!/n"); break; case WAIT_OBJECT_0+1: printf("HANDLE h[0] is running!/n"); break; } ::CloseHandle(h[0]); ::CloseHandle(h[1]); printf("END/n"); getchar(); return 0; }

運行結果：

wait timeout! END Normal thread running, count = 0 Normal thread running, count = 1 Normal thread running, count = 2 Normal thread running, count = 3 Normal thread running, count = 4 Normal thread running, count = 5 Normal thread running, count = 6 Normal thread running, count = 7 Idle thread running, count = 0 Normal thread running, count = 8 Idle thread running, count = 1 Normal thread running, count = 9 Idle thread running, count = 2 Idle thread running, count = 3 Idle thread running, count = 4 Idle thread running, count = 5 Idle thread running, count = 6 Idle thread running, count = 7 Idle thread running, count = 8 Idle thread running, count = 9

疑惑以及解釋:(有什麼不妥的地方，還請大家多多指教)

由於我這裏設置等待的時間是0，所以在新建立的兩個線程還未執行前，主線程已經執行到了getchar()；
也就是說已經執行了closehandle(),那後面的兩個線程怎麼又能執行並打印結果呢？開始一直對這個問題
不解，通過翻閱了王豔平的《Windows程序設計》，才明白原來closehandle()並沒有真正的銷燬句柄
具體解釋：
 每次createthread()創建線程對象的時候，線程對象中Usage count的初始化值爲2（注意不是1）
closehandle()能是Usage count的值減少1，這個時候Usage count的值爲1，所以並沒有銷燬，只有
當線程執行的函數通過return結束的時候，Usage count繼續減少1變爲0，這個時候才真正的銷燬對象