windows和linux下等待线程的退出

   在linux上，创建一个线程然后在主进程中等待线程的退出，系统提供的api是比较显而易见的，创建线程使用pthread_create，线程退出使用pthread_exit，主线程等待线程退出使用pthread_join，下面就是在等待一个睡眠5S的线程退出例子，我们也可以获取到线程退出时传递的一些消息。

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <pthread.h>

void *thread_function(void *arg) {
	char *code = "1";
	sleep(5);
	pthread_exit( code );
}

int main() {
    int res;
    pthread_t a_thread;
    void *thread_result;
	
    res = pthread_create(&a_thread, NULL, thread_function, NULL);
    if (res != 0) {
        perror("Thread creation failed");
        exit(EXIT_FAILURE);
    }
	
    printf("\nWaiting for thread to finish...\n");
    res = pthread_join(a_thread, &thread_result);
    if (res != 0) {
        perror("Thread join failed");
        exit(EXIT_FAILURE);
    }
	printf("Exit code is %s\n", (char *)thread_result);
    exit(EXIT_SUCCESS);
}

  在windows上，我们同样可以实现该功能，实现如下：

#include "stdafx.h"
#include <Windows.h>


LRESULT WINAPI ThreadFunction(LPARAM lp)
{
	Sleep(5000);
	return 2;
}

int _tmain(int argc, _TCHAR* argv[])
{
	DWORD dwCode;
	HANDLE hThread = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)ThreadFunction, NULL, 0, NULL);
	printf("Waiting for thread to finish...\n");
	WaitForSingleObject(hThread, INFINITE);/* 等待线程退出 */
	GetExitCodeThread(hThread, &dwCode);
	printf("Exit code is %d\n", dwCode);
	CloseHandle(hThread);
	return 0;
}