RE: [ECOS] Problem with multiple threads

["Himanshu Patel" <himanshup at aftek dot com>]

Hi Andrew,

We have selected CYGSEM_LIBC_STDIO_THREAD_SAFE_STREAMS option. So printf
should thread safe. Right? 

We would try playing with
http://ecos.sourceware.org/docs-latest/user-guide/kernel-instrumentation.htm
l and see. 

Regards,

Himanshu Patel

-----Original Message-----
From: ecos-discuss-owner@ecos.sourceware.org
[mailto:ecos-discuss-owner@ecos.sourceware.org] On Behalf Of Andrew Lunn
Sent: Monday, March 30, 2009 7:55 PM
To: Himanshu Patel
Cc: eCos Discuss
Subject: Re: [ECOS] Problem with multiple threads

On Mon, Mar 30, 2009 at 07:49:45PM +0530, Himanshu Patel wrote:
> Hi All,
> 
> We are developing application with multiple threads. Application with
> two threads are running without any issues (with both the threads are
> getting time slice).
> 
> Now I have requirement of adding one more thread. What is observed that,
> now one of the threads gets time slice only once and then control never
> return back to that thread. Priority of all the threads are equal. So
> ideally all threads should get equal time slice. All three threads are
> independent (not synchronized with any synchronization primitive). 
> 
> What could be the issue? Any suggestion?

There are synchronisation primitives hiding where you don't initially
think. eg printf.

Try playing with:

http://ecos.sourceware.org/docs-latest/user-guide/kernel-instrumentation.htm
l
        Andrew

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