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Re: gForth and unix/pthread.fs

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Andrew Haley wrote:

> Bernd Paysan <bernd.paysan@gmx.de> wrote:
>> This is a typical Ulrich Drepper: implement something in a way that can't
>> possibly work, and then claim it is impossible to fix...
> 
> C'mon Bernd, your English comprehension is better than that.  He
> didn't say mcheck was impossible to fix, he said it's impossible to
> fix the technology underlying mcheck.

And he did the underlying technology (which are the malloc hooks).  So he 
did implement something that isn't possible to work in a multithreaded 
environmnent, and then is incapable of fixing it.  Why the heck is it 
impossible to have thread-safe hooks for exception handling or other things 
like sanity checking?

The whole exception stuff in malloc() is impossible to use reasonable.  If 
something goes wrong in malloc() or free(), the default (thread-safe) 
behavior is to print a C backtrace and a memory map and terminate the 
program.  For a VM, this is inadequate, because the C backtrace is 
meaningless, and terminating the program is a bad idea, too.  We have our 
own exception handling.

What I actually want is a hook for the exception reporting, which mcheck() 
doesn't really provide - it *also* turns on some more expensive sanity 
checking.  I don't need or want that, the only thing I want is to take over 
when the normal code detects that there is something wrong.  I would expect 
that only mcheck_pedantic() would install those sanity checks.

And first of all, I would expect that a non-thread-safe function for 
otherwise thread-safe stuff (malloc is very explicitely stated to be thread-
safe) would have a big warning label in the manpage.

-- 
Bernd Paysan
"If you want it done right, you have to do it yourself"
http://bernd-paysan.de/

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gForth and unix/pthread.fs voidvolker@gmail.com - 2013-09-16 00:43 -0700
  Re: gForth and unix/pthread.fs anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-09-16 09:05 +0000
    Re: gForth and unix/pthread.fs voidvolker@gmail.com - 2013-09-16 05:43 -0700
  Re: gForth and unix/pthread.fs VoidVolker <voidvolker@gmail.com> - 2013-09-19 10:14 -0700
    Re: gForth and unix/pthread.fs Bernd Paysan <bernd.paysan@gmx.de> - 2013-09-20 01:26 +0200
      Re: gForth and unix/pthread.fs VoidVolker <voidvolker@gmail.com> - 2013-09-19 19:17 -0700
        Re: gForth and unix/pthread.fs Bernd Paysan <bernd.paysan@gmx.de> - 2013-09-20 16:20 +0200
          Re: gForth and unix/pthread.fs VoidVolker <voidvolker@gmail.com> - 2013-09-20 08:43 -0700
            Re: gForth and unix/pthread.fs Bernd Paysan <bernd.paysan@gmx.de> - 2013-09-20 19:07 +0200
              Re: gForth and unix/pthread.fs Bernd Paysan <bernd.paysan@gmx.de> - 2013-09-20 19:14 +0200
                Re: gForth and unix/pthread.fs Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-09-21 05:02 -0500
                Re: gForth and unix/pthread.fs Bernd Paysan <bernd.paysan@gmx.de> - 2013-09-21 15:55 +0200
                Re: gForth and unix/pthread.fs Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-09-21 11:32 -0500
                Re: gForth and unix/pthread.fs Bernd Paysan <bernd.paysan@gmx.de> - 2013-09-21 20:44 +0200
                Re: gForth and unix/pthread.fs Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-09-22 05:03 -0500
                Re: gForth and unix/pthread.fs Bernd Paysan <bernd.paysan@gmx.de> - 2013-09-22 21:18 +0200
                Re: gForth and unix/pthread.fs VoidVolker <voidvolker@gmail.com> - 2013-09-21 11:41 -0700
                Re: gForth and unix/pthread.fs Bernd Paysan <bernd.paysan@gmx.de> - 2013-09-21 21:18 +0200
                Re: gForth and unix/pthread.fs VoidVolker <voidvolker@gmail.com> - 2013-09-21 13:55 -0700
                Re: gForth and unix/pthread.fs Bernd Paysan <bernd.paysan@gmx.de> - 2013-09-21 23:40 +0200
              Re: gForth and unix/pthread.fs albert@spenarnc.xs4all.nl (Albert van der Horst) - 2013-09-21 12:59 +0000

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