[Boost-users] [Boost Interprocess] - Shared Memory File - Corruption

From: Srinivas Gardas (gardas_at_[hidden])
Date: 2008-01-07 16:08:33

Hi,
I am facing an issue with the 'Shared Memory File'.. Sometimes I get the
'SharedMemory File Name' as the first element of the structure that I used,
to create a 'interprocess::list' and when this happens, it means that the
SharedMemory got corrupted and my program crashes. Has anyone faced this
issue, or does anyone know what might be wrong?

Here's how I am using the Boost::Interprocess

struct
*struct_a*

{

char sym[6];

char desc[8];

double price;

};
typedef boost::interprocess::managed_shared_memory::segment_manager
SegmentManager;
typedef boost::interprocess::allocator<*struct_a*, SegmentManager>
shMemAllocator;
typedef boost::interprocess::list<*struct_a*, shMemAllocator> shMemList;
 typedef boost::interprocess::managed_shared_memory shMemObject
boost::scoped_ptr< boost::interprocess::managed_shared_memory > m_shMemPtr;

shMemList* m_pList;

m_shMemPtr.reset(
new shMemObject(boost::interprocess::open_or_create, "shmemfile.shmem" ,
100000*sizeof(*struct_a*)));

m_shMemPtr->reserve_named_objects(100000);

m_pList = m_shMemPtr->find_or_construct<shMemList>("SHMEM_NAME")(m_shMemPtr->get_segment_manager());

struct_a stOne;

strcpy(stOne.sym, "ABCDE");

strcpy(stOne.desc, "FGHIJK");

stOne.price = 10.25;

m_pList->push_back(stOne);

Another program Opens this sharedmemory file and reads the struct from the
list and '*pops*' it.

What happens sometimes is, In the first field of the struct I see '*
SHMEM_NAME*' and the program crashes when this happens. I am not sure what's
causing the *struct.field *to comein as Sharedmemory name?

If I clean the shared memory file and restart it works fine but I end up
with this problem some ther time. This does not happen regularly but it sure
does.

I'd really appreciate any help figuring the solution out or if there's any
mistake I am making.

Thanks in Advance,

Srinivas Gardas