Re: [boost] [interprocess] shared memory map only working with built-in types?

From: Ion Gaztañaga (igaztanaga_at_[hidden])
Date: 2008-06-15 14:53:11

Darren Garvey wrote:
> Hello Ion,
> 
> Title says it all really: the attached mini-program gives me a segmentation
> fault on ubuntu linux 8.04 with gcc 4.2.3 when trying to read back the
> shared memory between process invocations (trying a similar program on XP
> also fails).

The problem is that you are trying to put a type (std::string) that is 
not ready for shared memory or memory mapped files because:

1) it surely uses internal raw pointers
2) allocates memory from the heap instead of from the shared memory

That's why Interprocess offers its own containers. See documentation 
about those containers and also try to see some tests where interprocess 
basic_string is being used. That will give you some clues on how to use 
strings in shared memory.

> [*] - named_condition_test.cpp fails because:
> """
> ../../../boost/interprocess/sync/named_condition.hpp:165: error:
> 'external_unlock' was not declared in this scope
> """

Thanks. Solved in trunk.

Regards,

Ion