Re: [ts-7000] Re: Fast usleep

[D V <>]

Hi Charlie!

Thanks for the answer. Your suggestion could be right, because in the serial communication thread I use signal handler to catch the incoming data from device. But I don't understand why this action wakes up the other thread earlier from usleep? And how can I eliminate this? I have no error, so I can't check the error code you've mentioned. do you think the nanosleep could be better in this case?

cheers, denx

---

From: charliem_1216 <>
To:
Sent: Monday, 23 March, 2009 21:05:30
Subject: [ts-7000] Re: Fast usleep

Hi --

--- In .com, "denx_ts" <> wrote:
>
> Hi All!
>
> I'm developing a complex system based on TS-7250 SBC. The program is written in gnu c (by myself). I have 5 threads in the system and I recognize a strange influence between thees. When my serial communication thread works - I mean it communicates with an external peripheral - the usleep() function getting extremely fast in another (the main) thread. I know the resolution of the usleep() is 10 ms, but I use it with 2.0-5.0 sec timings, but more precisely than a sec.
>
> The strangest part of the situation is the faster behavior of usleep() instead of slower. I mean I could imagine that the usleep() is getting slower because of high load, but I don't understand how can it be faster than normal! (Actually the system isn't at high load, it was just an idea.)
>
> Any suggestions is appreciated!

On an early wakeup, check the error code to see if it was woken by a signal. You could also try nanosleep instead of usleep.

What kernel, and what threading library?

regards, ......... Charlie
>
> BR:
> denx
>

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