进程结束"/>
等待所有子进程结束
C语言方法一:http://stackoverflow/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/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/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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等待所有子进程结束
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