在Linux中周期性任务 [英] Periodic Task in Linux

问题描述

我想写一个C程序将定期执行某些任务（例如，在控制台上打印的东西）。

I want to write a C program that would periodically perform some task (say, print something on console).

我下面使用了nanosleep付诸实施。每500ms的功能'功能'之称。

I have implemented it using nanosleep as below. Every 500ms the function 'func' is called.

#include <stdio.h>
#include <time.h>

void func(void);

int main()
{
  struct timespec mytimespec;
  mytimespec.tv_sec = 0;
  mytimespec.tv_nsec = 500000000; /* 500 ms */

  while(1)
  {
    func(); 
    nanosleep(&mytimespec,NULL);
  }
  return 0;
}

void func(void)
{
  printf("This would be printed periodically\n");
}

以上工作正常。但是我有些疑惑： -

Above is working correctly. However I have some doubts:-

• 如果有多个线程和一个线程依赖于了nanosleep 做周期性任务难道准确工作？

• Would it work accurately if there are multiple threads and one thread relies on nanosleep to do the periodic task?

有没有办法产卵在linux周期性线程？或者使用一些定时器的回调？

Is there a way to spawn a periodic thread in linux? Or, to use some timer callback?

推荐答案

您应该阅读的时间（7）（也许信号（7 ） ...）。你可能需要一些事件循环（至少如果你的程序做一些输入）。这个循环是基于如调查（2）复用系统调用（见这和了答案）。许多图书馆提供事件循环，尤其是的libevent ，的 libev ，GTK /巧舌如簧，Qt的，...

You should read time(7) (and perhaps signal(7)...). You probably want some event loop (at least if your program is doing some input). That loop is based upon a multiplexing syscall like poll(2) (see also this and that answers). Many libraries provide event loops, notably libevent, libev, Gtk/Glib, Qt, ...

在Linux上，你可以的也的通过的 timerfd_create（2）（除了其他更传统的解决方案）。

On Linux you could be also interested by timerfd_create(2) (in addition of other more traditional solutions).

和阅读高级Linux编程

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