Subj : Re: pthread function behavior in C++ program
To   : comp.programming.threads
From : Torsten Robitzki
Date : Thu Jun 09 2005 11:57 am

wij@seed.net.tw wrote:
> Hi:
>   Sometime ago I found my C++ programs were outdated by so called
>   NPTL(probably). Programs built (on Fedora 3) indicate that
>   thread cancellation can cause an object thrown at cancellation
>   point. So, what should I expect pthread function will behave in
>   C++ and modify my programs? or does any documents there specify
>   pthread function behavior(in C++ codes)? 

The problem is, that there is no binding of pthread to c++ (yet). I 
don't know your implementation, but I guess that most c++ compiler 
vendors define somewhere how cancellation will be handled. For my 
platform (Alpha/VMS) it is guarantied that destructor will be executed, 
but c++ exception handlers will not in case that a thread get canceled. 
So one can not rely on C++ exception handlers but on destructors and I 
guess that in a further C++ standard on can rely on destructors too.

So the best thing one can do is to avoid cancellation at all or as a 
second best solution don't rely on exception handlers being called.

 > Strange to say, I have
>   searched for days and found nothing available/useful to update my
>   programs for NPTL! Can anybody give some hints. Take for instance
>   pthread_cancel/pthread_testcancel/pthread_cond_wait..
>   thank you in advance.
> 

I used "NPTL C++ cancellation" to search on google and the results looks 
very promising.

regards
Torsten

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