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/////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2006-2012
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/libs/intrusive for documentation.
//
/////////////////////////////////////////////////////////////////////////////
//This is needed to allow concurrent test execution in
//several platforms. The shared memory must be unique
//for each process...
#include <boost/interprocess/detail/os_thread_functions.hpp>
#include <sstream>
const char *get_shared_memory_name()
{
std::stringstream s;
s << "process_" << boost::interprocess::ipcdetail::get_current_process_id();
static std::string str = s.str();
return str.c_str();
}
//[doc_offset_ptr_0
#include <boost/intrusive/list.hpp>
#include <boost/interprocess/offset_ptr.hpp>
using namespace boost::intrusive;
namespace ip = boost::interprocess;
class shared_memory_data
//Declare the hook with an offset_ptr from Boost.Interprocess
//to make this class compatible with shared memory
: public list_base_hook< void_pointer< ip::offset_ptr<void> > >
{
int data_id_;
public:
int get() const { return data_id_; }
void set(int id) { data_id_ = id; }
};
//]
//[doc_offset_ptr_1
#include <boost/interprocess/managed_shared_memory.hpp>
#include <boost/interprocess/containers/vector.hpp>
#include <boost/interprocess/containers/list.hpp>
#include <boost/interprocess/allocators/allocator.hpp>
//Definition of the shared memory friendly intrusive list
typedef list<shared_memory_data> intrusive_list_t;
int main()
{
//Now create an intrusive list in shared memory:
//nodes and the container itself must be created in shared memory
const int MaxElem = 100;
const int ShmSize = 50000;
const char *ShmName = get_shared_memory_name();
{
//Erase all old shared memory
ip::shared_memory_object::remove(ShmName);
ip::managed_shared_memory shm(ip::create_only, ShmName, ShmSize);
//Create all nodes in shared memory using a shared memory vector
//See Boost.Interprocess documentation for more information on this
typedef ip::allocator
< shared_memory_data, ip::managed_shared_memory::segment_manager>
shm_allocator_t;
typedef ip::vector<shared_memory_data, shm_allocator_t> shm_vector_t;
shm_allocator_t shm_alloc(shm.get_segment_manager());
shm_vector_t *pshm_vect =
shm.construct<shm_vector_t>(ip::anonymous_instance)(shm_alloc);
pshm_vect->resize(MaxElem);
//Initialize all the nodes
for(int i = 0; i < MaxElem; ++i) (*pshm_vect)[i].set(i);
//Now create the shared memory intrusive list
intrusive_list_t *plist = shm.construct<intrusive_list_t>(ip::anonymous_instance)();
//Insert objects stored in shared memory vector in the intrusive list
plist->insert(plist->end(), pshm_vect->begin(), pshm_vect->end());
//Check all the inserted nodes
int checker = 0;
for( intrusive_list_t::const_iterator it = plist->begin(), itend(plist->end())
; it != itend; ++it, ++checker){
if(it->get() != checker) return false;
}
//Now delete the list and after that, the nodes
shm.destroy_ptr(plist);
shm.destroy_ptr(pshm_vect);
}
ip::shared_memory_object::remove(ShmName);
return 0;
}
//]
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