From: Jonathan Larmour <jifl@eCosCentric.com>
To: Gary Thomas <gary@mlbassoc.com>
Cc: Bob.Brusa@gmail.com,
eCos discussion <ecos-discuss@ecos.sourceware.org>
Subject: Re: [ECOS] priority of main thread
Date: Fri, 21 Nov 2008 18:07:00 -0000 [thread overview]
Message-ID: <4926CC5B.2000102@eCosCentric.com> (raw)
In-Reply-To: <49258AC6.8060609@mlbassoc.com>
Gary Thomas wrote:
> Robert Brusa wrote:
>> On Thu, 20 Nov 2008 16:34:18 +0100, Gary Thomas <gary@mlbassoc.com> wrote:
>>
>>> How is main() getting started? Since you've overridden the
>>> default cyg_user_start() [which normally starts the main thread],
>>> it's not clear to me how main() even runs.
>>>
>> If there is anywhere a main in a project, it gets started - but after
>> cyg_user_start. That's what I have read in the manual and somewhere I
>> have read that a main is required when one uses some (which?) standard
>> libraries that need initialisation. Because I use math and other
>> libraries, I decided to have a main in my code. May be its not
>> necessary, but it should do no harm (I hope).
>
> Actually, main() is started by cyg_user_startup(). Look at
> .../language/c/libc/startup/current/src/cstartup.cxx
Actually it only gets started from cyg_user_start() if the user enables
CYGSEM_LIBC_STARTUP_MAIN_INITCONTEXT. But that is only the default if there
is no eCos kernel at all.
Otherwise (in the more normal case), it is created and started from a
static constructor. So overriding cyg_user_start() makes no difference.
To answer the poster's question, the priority is set with the
CYGNUM_LIBC_MAIN_THREAD_PRIORITY configuration option in the
CYGPKG_LIBC_STARTUP ("ISO environment startup/termination") package.
Jifl
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next prev parent reply other threads:[~2008-11-21 14:58 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-20 15:34 Robert Brusa
2008-11-20 16:02 ` Gary Thomas
2008-11-20 16:06 ` Robert Brusa
2008-11-20 18:42 ` Gary Thomas
2008-11-21 18:07 ` Jonathan Larmour [this message]
2008-11-24 11:06 ` Robert Brusa
2008-11-24 11:53 ` Robert Brusa
2008-11-24 12:57 ` Jonathan Larmour
2008-11-20 16:03 ` Andrew Lunn
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