Re: [ECOS] Memory allocation failure

[David Brennan <eCos@brennanhome.com>]

Andrew Lunn wrote:

>On Fri, May 06, 2005 at 06:57:19AM -0700, David Brennan wrote:
>  
>
>>I have created two different applications with the same eCos 
>>configuration and essentially the same code base. One trivial 
>>application which is missing most of the meat of the main application. 
>>The trivial application runs fine. However when I try and start the real 
>>application, it dies during my static constructors. I have traced the 
>>problem down to a malloc call, but GDB eventually hangs while trying to 
>>single step through there. It always hangs at this one particular 
>>malloc, when constructing one particular instantiation of a class. Any 
>>ideas? Is there a fixed number of pool elements which can be allocated 
>>using dlmalloc?
>>Target is i386 VME based PC.
>>    
>>
>
>A total guess.....
>
>You say this is a constructor. When is the constructor called? Is it a
>static constructor which will be called early during startup? 
>
It is a static constructor, using the default constructor init priority. 
However, the application has already run a lot of other static 
constructors by the time this happens. (Our application actually has its 
own heap manager, which says that we have allocated over 10Meg of heap 
around the time of the crash.)

Another engineer posed the question to me, "Whose stack are the 
constructors using, and how big is it?" A question which I cannot 
answer. Is there a configuration option for that stack space? We had a 
problem with VxWorks, which tried to run all of the constructors with 
too small of a stack.

>Have you
>checked that malloc's constructor has already been called so that
>malloc itself is read to be called?
>
>  
>
Based on the population of the mypool variable, it looks like the 
constructor ran. I did not specifically test that. But I would assume 
that would be a problem for all of eCos if the malloc is not one of the 
first things constructed.

Dave

>        Andrew
>
>
>  
>

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