timer_list for FreeBSD?

[Yong Ma]

----- Original Message -----
From: "M. Warner Losh" <imp at bsdimp.com>
To: mayong at mail.com
Subject: Re: timer_list for FreeBSD?
Date: Wed, 23 Nov 2005 09:50:44 -0700 (MST)

> 
> In message: <20051123092444.D826E164293 at ws1-4.us4.outblaze.com>
>              "Yong Ma" <mayong at mail.com> writes:
> : In my work I send some data to the card and wait for a result in a
> : loop.but sometimes it can't get it ,so the driver run and run and
> : can't get out of the loop.I need something like timer_list in Linux
> : with which I can decide the max time the loop will run.I searched it
> : in the source code but found little about that.Anyone can help?
> 
> Typically this sort of thing is done in FreeBSD in a more ad-hoc way:
> 
> 	  /*
> 	   * Wait at most 1ms for the busy bit to flip.  Datasheet
> 	   * says it will take up to 250us, so add a sane margin of
> 	   * error in case they are wrong.  Note: GetStatus takes 1us
> 	   * to perform the i/o.
> 	   */
> 	  limit = 1000;
> 	  while ((GetStatus() & BusyBit) && limit-- > 0)
> 		continue;
> 
> There's no easy API that will let you limit it to a fixed time.  The
> above typically is sufficient for 'don't loop forever' so nothing
> fancier has been created.
> 
> Warner

Thank you!
I tryed to make it with sleep(),but failed:
 
 ...
 #include <unistd.h>
 ...
 sec=10; //wait for ten seconds
 while(GetStatus() && sec-->0){
    dosomething();
    sleep(1);
 }
 ...
 complied successfully and made the xxx.ko,but when kldload ./xxx.ko it told me can't load,I don't know why!

Yong

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