Catching a hot potato

[Daniel Gibson]

Am 15.10.2011 18:29, schrieb Gor Gyolchanyan:
> Thanks! I never thought, you could give a DLL another address space.
> I don't quite understand how it works yet, but i'll look into it.
>

I never heard of this either, but it sounds pretty interesting.
If you find information about it please post some links here :-)

(Is this a Windows DLL only thing or does it also work with Linux/Unix 
shared libraries?)

Cheers,
- Daniel

> On Sat, Oct 15, 2011 at 8:15 PM, Walter Bright
> <newshound1 at digitalmars.com>  wrote:
>> On 10/15/2011 3:29 AM, Gor Gyolchanyan wrote:
>>>
>>> The other day i was re-reading the std.exception docs and stumbled
>>> upon "It's ill-advised to catch anything, that is not Exception or
>>> derived from it".
>>> Can you show me examples when catching a Throwable is a good idea?
>>
>> When there's something your program needs to do in order to shut down
>> gracefully (such as "engage the backup", or "try to save the user's data"),
>> or if you want to generate a log message before stopping the program.
>>
>> Catching it can also be used to shut down a failing subsystem and restart
>> it.
>>
>>> Also, i had some thoughts about catching AcessViolation exception in a
>>> modular application to avoid my app crashing when a module crashes,
>>> but i was told, that segfaults indicate a messed up memory and nothing
>>> is guaranteed to work after a segfault.
>>
>> That's true, an access violation means you've got likely got memory
>> corruption somewhere.
>>
>>> My question is, is it true, that segfault means THE END, and if so,
>>> what's the point in allowing to catch it?
>>
>> Debuggers need to catch all seg faults from the debuggee. OS services need
>> to catch page faults in order to implement demand paged virtual memory,
>> stack faults in order to extend the stack segment, etc.
>>
>>> Also, how do i prevent DLLs from crashing my process like that?
>>
>> You'll need to figure out how to run your DLL in a separate address space,
>> like a debugger would.
>>
>>