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Re: priority of main thread
- From: Andrew Lunn <andrew at lunn dot ch>
- To: Robert Brusa <bob dot brusa at gmail dot com>
- Cc: MailingList: ecos-discuss <ecos-discuss at ecos dot sourceware dot org>;
- Date: Thu, 20 Nov 2008 16:38:04 +0100
- Subject: Re: [ECOS] priority of main thread
- References: <op.ukxbn8ajkeg3uf@localhost>
On Thu, Nov 20, 2008 at 04:22:58PM +0100, Robert Brusa wrote:
> Hi,
> in my system, I have a cyg_user_start() as well as a main() function. The
> first includes calls to initialize various modules. main() contains an
> eternal loop and is assumed to work as a normal thread. The problem is
> that main produces a hanger when I call cyg_spi_transfer to read my
> onboard-RTC. When using this RTC-module in a test program with a single
> thread it works. It also works (in main) when I change the transfer-mode
> to polling. This let me think that there is some kind of priority
> problem.
I would not necessarily agree with this. If it is a priority problem,
it suggests one of the threads running with higher priority than main
is spinning, so stopping main from running. This is normally a
bug. However this does not really fit with PIO working.
This actually sounds like an interrupt problem. I would put a
breakpoint on the interrupt handler and see if it gets called.
Andrew
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