If memory serves, boost::interprocess::managed_shared_memory has issues with shared memory between 32-bit and 64-bit applications, at least on Windows 7. I've used boost::interprocess::shared_memory_object to map shared memory between 32-bit and 64-bit applications without any trouble. Here's some code snippets to set things up... struct SMdata { .... } 32-bit application code (creates shared memory for read/write): boost::interprocess::shared_memory_object* shm; boost::interprocess::mapped_region* region; SMdata* data; shm = new boost::interprocess::shared_memory_object(create_only, "SHMEM", read_write); shm->truncate(sizeof(SMdata)); region = new mapped_region(*shm, read_write); void* addr = region->get_address(); data = new (addr)SMdata; // data can now be written to and read from 64-bit application code (opens shared memory for read/write): SMdata* data; boost::interprocess::shared_memory_object shm(open_only, "SHMEM", read_write); mapped_region region(shm, read_write); void* addr = region.get_address(); data = static_cast<SMdata*>(addr); // data can now be written to and read from Obviously, you'll need to synchronize/protect the shared memory with the objects provided for in boost::interprocess when you do the reads and writes to the shared memory structure... HTH Shayne -----Original Message----- From: Boost-users [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Jan Boehme Sent: Thursday, February 18, 2016 1:11 AM To: boost-users@lists.boost.org Subject: Re: [Boost-users] [Interprocess] Communication between x86 and x64 issue On 07/29/2015 10:02 PM, Toni Neubert wrote:

I want to communicate between different platforms using boost interprocess.

I am using vc12 and boost 1.58 on windows 7.

My code below is a very simple example, that should work. But it doesn't for communications between different platforms...

If I create it in x64 and open in win32, the process stuck at a lock at function try_based_lock in boost/int/sync/detail/common_algorithms.hpp

In the other way around: win32 create, x64 open: the process crashes at name_length in segment_manager_helper.hpp while trying to find the name in index (priv_generic_find in segment_manager).

#include <iostream> #include <boost/interprocess/managed_shared_memory.hpp>

int main() { namespace bip = boost::interprocess;

// open in WIN32, create in x64 #ifdef _WIN32 bip::managed_shared_memory msm(bip::open_only, "TestIPC"); #elsif X64 bip::shared_memory_object::remove("TestIPC"); bip::managed_shared_memory msm(bip::create_only, "TestIPC", 4096); msm.construct<uint32_t>("Data")[1](10); #endif

// Get Data and print it auto data = msm.find<uint32_t>("Data"); if (data.second == 1) { std::cout << *data.first << std::endl; } std::cin.ignore();

return 0; }

Does anybody have experience in this? Thank you in advance!

Hello, some things indicate that's not possible to do with boost::interprocess: #1 The internal structure, look at the header struct for example, uses data types that are different in length at 32 vs 64 bit arch. #2 Using a hex editor and looking at the shm for the object shows that there are major differences in the area before your actual data ( which might be safe). The reason for this is #1.And this is the reason for undefined behavior when trying to access it. Regards, Jan _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users