在linux上,創建一個線程然後在主進程中等待線程的退出,系統提供的api是比較顯而易見的,創建線程使用pthread_create,線程退出使用pthread_exit,主線程等待線程退出使用pthread_join,下面就是在等待一個睡眠5S的線程退出例子,我們也可以獲取到線程退出時傳遞的一些消息。
#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,我們同樣可以實現該功能,實現如下:#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);/* 等待線程退出 */
GetExitCodeThread(hThread, &dwCode);
printf("Exit code is %d\n", dwCode);
CloseHandle(hThread);
return 0;
}