Re: [igraph] Multi-threading and igraph

[Thomas Gorochowski]

Hi Gabor,

The following webpage outlines the main points you would need to consider. I'm 
not familiar with how errors are handled in igraph but one work around if 
static variables crop up is to use locks to ensure that changes become atomic 
and therefore safe.

I'm not am expert, but will ask some of the developers in our group to see if 
they have any other suggestions.

All the best, 

Tom

On 29 Oct 2010, at 22:03, Gábor Csárdi <address@hidden> wrote:

> Hi Tom,
> 
> indeed, the error handling is not thread-safe in igraph. I guess it
> would not be too hard to make it thread-safe, but I am not an expert
> on this. Could you recommend some good documentation on writing
> thread-safe libraries?
> 
> Thanks,
> Gabor
> 
> If On Fri, Oct 29, 2010 at 10:22 PM, Thomas Gorochowski
> <address@hidden> wrote:
>> Hi there,
>> 
>> I am attempting to use OpenMP for some statistical sampling. When using 
>> igraph functions within a parallel block I have noticed errors occur such as 
>> the following:
>> 
>> corrupt finally stack, popping 2 elements when only 1 left
>> Assertion failed: (no>=0), function IGRAPH_FINALLY_REAL, file error.c, line 
>> 126.
>> Abort trap
>> 
>> I'm assuming that igraph has not been written with multi-threading in mind, 
>> however, was wondering if there are any plans to make the library 
>> thread-safe in the near future? I'd ideally not like to fork processes as 
>> some data is required to be shared and passing that via messages is never 
>> much fun!
>> 
>> Thank for a great library and keep up the good work.
>> 
>> Tom.
>> 
>> --
>> T.E. Gorochowski
>> University of Bristol, Centre for Complexity Sciences (BCCS)
>> http://www.chofski.co.uk, address@hidden
>> 
>> Try our dynamical network simulator at http://www.netevo.org
>> 
>> 
>> _______________________________________________
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>> address@hidden
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>> 
> 
> 
> 
> -- 
> Gabor Csardi <address@hidden>     UNIL DGM
> 
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