#include <iostream.h>
#include <windows.h>
#define WT_EXECUTEDEFAULT 0x00000000
#define WT_EXECUTEINIOTHREAD 0x00000001
#define WT_EXECUTEINWAITTHREAD 0x00000004
#define WT_EXECUTEONLYONCE 0x00000008
#define WT_EXECUTELONGFUNCTION 0x00000010
#define WT_EXECUTEINTIMERTHREAD 0x00000020
#define WT_EXECUTEINPERSISTENTTHREAD 0x00000080
// 采用這個(gè)宏可以限制線程池的最大線程數(shù)
#define WT_SET_MAX_THREADPOOL_THREADS(Flags,Limit) \
??? ((Flags)|=(Limit)<<16)
DWORD WINAPI ThreadProc(LPVOID lpThreadParameter)
{
?cout << "test " << hex << ::GetCurrentThreadId() << endl;
?
?while(true)
?{
??Sleep(1000);
??cout << "test " << hex << ::GetCurrentThreadId() << endl;
?}
//?ExitThread( 0 );
?return 0; // 這里 return 0; 線程并沒有真正結(jié)束
}
DWORD WINAPI ThreadProc1(LPVOID lpThreadParameter)
{
?while(true)
?{
??Sleep(1000);
??cout << "test1 " << hex << ::GetCurrentThreadId() << endl;
?}
?return 0;
}
BOOL WINAPI QueueUserWorkItem(LPTHREAD_START_ROUTINE Function, PVOID Context, ULONG Flags)
{
??? typedef BOOL (WINAPI *LPQueueUserWorkItem)(LPTHREAD_START_ROUTINE Function, PVOID Context, ULONG Flags);
??? LPQueueUserWorkItem pfnQueueUserWorkItem = NULL;??
??? pfnQueueUserWorkItem = (LPQueueUserWorkItem)::GetProcAddress(::LoadLibrary("kernel32.dll"), "QueueUserWorkItem");
???
?if ( NULL == pfnQueueUserWorkItem )
?{
??return FALSE;
?}
?else
?{
??return pfnQueueUserWorkItem(Function, Context, Flags);??
?}
}
int main(int argc,char **argv)
{
?DWORD dt = WT_EXECUTEONLYONCE;
?// 如果在 ThreadProc 里面調(diào)用 ExitThread( 0 );， 則不會開啟 Thread1 線程
?// 但 QueueUserWorkItem 居然返回值是 TRUE
?//BOOL b = QueueUserWorkItem(ThreadProc, (void*)1 , WT_SET_MAX_THREADPOOL_THREADS(dt, 1));??
???
?// WT_EXECUTEINIOTHREAD 參數(shù)
??? dt = WT_EXECUTEDEFAULT;
?BOOL b = QueueUserWorkItem(ThreadProc, (void*)1 , WT_SET_MAX_THREADPOOL_THREADS(dt, 4));??
???
?if( !b )
??cout << "Failed to Create Thread" << endl;
?Sleep(5000);
?// 如果在 ThreadProc 里面沒有調(diào)用 ExitThread( 0 );， 在 Thread 和 Thread1 中看到的線程ID是一致的
?dt = WT_EXECUTEONLYONCE;
?
?//b = QueueUserWorkItem(ThreadProc1, (void*)1 , WT_SET_MAX_THREADPOOL_THREADS(dt, 1));?
?// WT_EXECUTEINIOTHREAD 參數(shù)
?dt = WT_EXECUTEDEFAULT;
?b = QueueUserWorkItem(ThreadProc1, (void*)1 , WT_SET_MAX_THREADPOOL_THREADS(dt, 4));?
?if( !b )
??cout << "Failed to Create Thread" << endl;
?Sleep(5000);
?// 程序退出時(shí)，即使 子線程沒有退出，系統(tǒng)也會強(qiáng)迫其退出？
?// WT_EXECUTEONLYONCE 與 WT_EXECUTEINIOTHREAD 的區(qū)別？??
?// 如果設(shè)置了 WT_EXECUTEINIOTHREAD 即不會執(zhí)行到 Thread1？
?return 0;
}