多執行緒中使用WaitForSingleObject結束執行緒，啥也不說，先上程式碼

#include <windows.h>
#include <String.h>
#include <stdio.h>

int Fun1Proc( void )
{
	int i;
	char *c = "thread one " ; 
	for(i = 0; i < 100; i++)
	{
		printf("%s number: %d \n",c ,i+1 );
	}	
	return 0;
}


int main(  )
{
	HANDLE hThread1;
	hThread1 = CreateThread(NULL, 0, Fun1Proc, NULL, 0, NULL);
	int i;
	char *c = "main thread " ; 
	for(i = 0; i < 100; i++)
	{
		printf("%s number: %d \n",c ,i+1 );
	}
	CloseHandle(hThread1);

	return 0;
}
 

main thread 1
main thread 2
main thread 3
...

main thread 98
main thread 99
main thread 100

為什麼執行緒函式沒有執行呢？奇怪，多執行幾遍，發現每次結果不一定相同，下面是另一次執行結果：

main thread 1
main thread 2
main thread 3

...

main thread 71

thread one 1
thread one 2

main thread 72

main thread 73

...

thread one 3
thread one 4

main thread 75

main thread 76

...

main thread 98
main thread 99
main thread 100

可見，主函式執行完了，整個程式就退出了，不會等到Fun1Proc（）執行完再退出。等2秒會不會好一點呢？下面是修改後的main程式

int main(  )
{
	HANDLE hThread1;
	hThread1 = CreateThread(NULL, 0, Fun1Proc, NULL, 0, NULL);
	Sleep(2000);

	int i;
	char *c = "main thread " ; 
	for(i = 0; i < 100; i++)
	{
		printf("%s number: %d \n",c ,i+1 );
	}
	

	return 0;
}
 

...

thread one 98
thread one 99
thread one 100

main thread 1
main thread 2
main thread 3
...

main thread 98
main thread 99
main thread 100

int main(  )
{
	HANDLE hThread1;
	hThread1 = CreateThread(NULL, 0, Fun1Proc, NULL, 0, NULL);
	WaitForSingleObject(hThread1, INFINITE);

	int i;
	char *c = "main thread " ; 
	for(i = 0; i < 100; i++)
	{
		printf("%s number: %d \n",c ,i+1 );
	}
	CloseHandle(hThread1);

	return 0;
}

int main(  )
{
	HANDLE hThread1;
	hThread1 = CreateThread(NULL, 0, Fun1Proc, NULL, 0, NULL);
	CloseHandle(hThread1);
	WaitForSingleObject(hThread1, INFINITE);

	int i;
	char *c = "main thread " ; 
	for(i = 0; i < 100; i++)
	{
		printf("%s number: %d \n",c ,i+1 );
	}
	

	return 0;
}

執行後發現，又和一開始一樣了，main thread 中穿插著 thread one。 原來是CloseHandle之後，WaitForSingleObject得不到thread的控制代碼，沒法再等到這個thread結束，呵呵。所以，如果後面還要用到這個thread控制代碼，就不要closeHandle；如果用不到，就可以先closeHandle。