[Boost-users] Re: Re: Re: boost::thread::join causes assertion(pthreads)

From: Vladimir Prus (ghost_at_[hidden])
Date: 2005-03-23 02:01:40

Peter Dimov wrote:

> Vladimir Prus wrote:
>>> Yes. assert is not equivalent to perror/abort. The two have different
>>> meanings and are not interchangeable.
>>
>> Care to elaborate why the change cannot be made in this specific case?
> 
> assert(expr) means a precondition failure or an internal error, depending
> on expr.
> 
> perror/abort means... perror/abort.

Ah.. you're talking about the meaning attached to the code by the
programmer. I was more talking that the effect will be almost the same.
Well, it's also possible to write

  if (!result) {
 perror(...);
        assert(...);
  }

> If the problem you are trying to fix is that assert() does not give enough
> information about the bug - and I haven't seen this particular problem
> reported as a defect 

I interpreted Kevin's post this way -- Boost.Tread fails and does not
produce any useful diagnostic.

> - the proper way to fix it is to define an 
> user-overrideable callback.

I think you're overgeneralising. If assert prints an error message and
exits, then what's the problem with printing one extra diagnostic message
before assert?

- Volodya