GetExitCodeThread()
BOOL GetExitCodeThread (
HANDLE hThread, // in,线程handle,也就是CreateThread()的返回值
LPDWORD lpExitCode //out,存储线程结束代码,也就是线程的返回值
);
说明: 此函数调用成功返回TRUE,失败返回FALSE,只表示这个函数是否调用成功而己.
不能根据返回值来判断一个线程是否结束,而要根据 lpExitCode的值来确定,
lpExitCode 值STILL_ACTIVE 表示线程正在运行.
若线程己经结束,则lpExitCode中存储指定线程的返回值.
例:
/*
* ExitCode.c
*
* Sample code for "Multithreading Applications in Win32"
* This is from Chapter 2, Listing 2-2
*
* Start two threads and try to exit
* when the user presses a key.
*/
#define WIN32_LEAN_AND_MEAN
#include
#include
#include
#include
DWORD WINAPI ThreadFunc(LPVOID);
int main()
{
HANDLE hThrd1;
HANDLE hThrd2;
DWORD exitCode1 = 0;
DWORD exitCode2 = 0;
DWORD threadId;
//创建成功,返回一个HANDLE,对于此线程的操作函数,几乎都使用此HANDLE
hThrd1 = CreateThread(NULL,
0, //堆栈大小,0取默认值1MB
ThreadFunc, //线程函数地址
(LPVOID)1, //线程的传入参数
0, //0 表示线程一旦创建 立即执行
&threadId ); //线程ID,一般为 向线程发送消息时用,
if (hThrd1)
printf("Thread 1 launched/n");
//
hThrd2 = CreateThread(NULL,
0,
ThreadFunc,
(LPVOID)2,
0,
&threadId );
if (hThrd2)
printf("Thread 2 launched/n");
// Keep waiting until both calls to
// GetExitCodeThread succeed AND
// neither of them returns STILL_ACTIVE.
// This method is not optimal - we'll
// see the correct way in Chapter 3.
for (;;)
{
printf("Press any key to exit../n");
getch(); // 按任意键继续
// 刺探 指定线程(通过线程的HANDLE) 是否己经结束,
//exitCode1中存储线程状态,若正在运行,值为STILL_ACTIVE
//若己经结束,值为 线程的返回值(即 return 后的值)
GetExitCodeThread(hThrd1, &exitCode1);
GetExitCodeThread(hThrd2, &exitCode2);
if ( exitCode1 == STILL_ACTIVE )
puts("Thread 1 is still running!");
if ( exitCode2 == STILL_ACTIVE )
puts("Thread 2 is still running!");
if ( exitCode1 != STILL_ACTIVE
&& exitCode2 != STILL_ACTIVE )
break;
}
CloseHandle(hThrd1); //线程核心对象的引用计数 减1
CloseHandle(hThrd2);
printf("Thread 1 returned %d/n", exitCode1);
printf("Thread 2 returned %d/n", exitCode2);
return EXIT_SUCCESS;
}
/*
* Take the startup value, do some simple math on it,
* and return the calculated value.
*/
DWORD WINAPI ThreadFunc(LPVOID n)
{
Sleep((DWORD)n*1000*2);
return (DWORD)n * 10;
}
//以上代码,存储进text文件,以.c为扩展名,拖进VC 6.0,编译,运行.
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