[Boost-users] error in recreation of shared memory using boost:: interprocess

[manish4gupta]

Hi,
I am creating shared memory with given name(by given file name with key
value ) and creating the map in the shared region by parsing key-value from
the file. First time it is ok. but when i try to do it again, I am getting
following error.

terminate called after throwing an instance of
'boost::interprocess::interprocess_exception'
what(): File exists
Aborted

What is the cause of this error. Thanks in advance.
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[Christoph Gysin]

> I am creating shared memory with given name(by given file name with key
> value ) and creating the map in the shared region by parsing key-value from
> the file. First time it is ok. but when i try to do it again, I am getting
> following error.
>
> terminate called after throwing an instance of
> 'boost::interprocess::interprocess_exception'
>  what():  File exists
> Aborted

Please read the documentation:
http://www.boost.org/doc/libs/1_40_0/doc/html/boost/interprocess/shared_memory_object.html

...
shared_memory_object(create_only_t, const char * name, mode_t mode);

Creates a shared memory object with name "name" and mode "mode", with
the access mode "mode" If the file previously exists, throws an error.

shared_memory_object(open_or_create_t, const char * name, mode_t mode);

Tries to create a shared memory object with name "name" and mode
"mode", with the access mode "mode". If the file previously exists, it
tries to open it with mode "mode". Otherwise throws an error.
...

Christoph
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