等待所有子进程结束

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C语言方法一http://stackoverflow.com/questions/1510922/waiting-for-all-child-processes-before-parent-resumes-execution-unix

通过不指定pid的方式调用waitpid方法,每次等待一个子进程结束,直到所有子进程都结束(waitpid()返回0)

while (pid = waitpid(-1, NULL, 0)) {   if (errno == ECHILD) {      break;   }}

C语言方法二http://stackoverflow.com/questions/19461744/make-parent-wait-for-all-child-processes

通过调用wait方法,每次等待一个子进程结束,直到所有子进程都结束(wait()返回0)

pid_t child_pid, wpid;int status = 0;//Father code (before child processes start)for (int id=0; id<n; id++) {    if ((child_pid = fork()) == 0) {        //child code        exit(0);    }}while ((wpid = wait(&status)) > 0); // this way, the father waits for all the child processes //Father code (After all child processes end)

Python方法http://stackoverflow.com/questions/2993487/spawning-and-waiting-for-child-processes-in-python

每创建一个子进程,都将该子进程的pid记录到一个pid的集合中,等所有子进程都创建完毕,逐个wait这个子进程pid集合中的每一个子进程,直到所有子进程都结束

pids.append(subprocess.Popen([RESIZECMD, lot, of, options])for pid in pids:pid.wait()


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