98 lines
3.3 KiB
C++
98 lines
3.3 KiB
C++
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// (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/interprocess for documentation.
|
|
//
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
#include <boost/interprocess/detail/config_begin.hpp>
|
|
#include <boost/interprocess/detail/workaround.hpp>
|
|
//[doc_map
|
|
#include <boost/interprocess/managed_shared_memory.hpp>
|
|
#include <boost/interprocess/containers/map.hpp>
|
|
#include <boost/interprocess/allocators/allocator.hpp>
|
|
#include <functional>
|
|
#include <utility>
|
|
//<-
|
|
#include "../test/get_process_id_name.hpp"
|
|
//->
|
|
|
|
int main ()
|
|
{
|
|
using namespace boost::interprocess;
|
|
|
|
//Remove shared memory on construction and destruction
|
|
struct shm_remove
|
|
{
|
|
//<-
|
|
#if 1
|
|
shm_remove() { shared_memory_object::remove(test::get_process_id_name()); }
|
|
~shm_remove(){ shared_memory_object::remove(test::get_process_id_name()); }
|
|
#else
|
|
//->
|
|
shm_remove() { shared_memory_object::remove("MySharedMemory"); }
|
|
~shm_remove(){ shared_memory_object::remove("MySharedMemory"); }
|
|
//<-
|
|
#endif
|
|
//->
|
|
} remover;
|
|
//<-
|
|
(void)remover;
|
|
//->
|
|
|
|
//Shared memory front-end that is able to construct objects
|
|
//associated with a c-string. Erase previous shared memory with the name
|
|
//to be used and create the memory segment at the specified address and initialize resources
|
|
//<-
|
|
#if 1
|
|
managed_shared_memory segment(create_only,test::get_process_id_name(), 65536);
|
|
#else
|
|
//->
|
|
managed_shared_memory segment
|
|
(create_only
|
|
,"MySharedMemory" //segment name
|
|
,65536); //segment size in bytes
|
|
//<-
|
|
#endif
|
|
//->
|
|
|
|
//Note that map<Key, MappedType>'s value_type is std::pair<const Key, MappedType>,
|
|
//so the allocator must allocate that pair.
|
|
typedef int KeyType;
|
|
typedef float MappedType;
|
|
typedef std::pair<const int, float> ValueType;
|
|
|
|
//Alias an STL compatible allocator of for the map.
|
|
//This allocator will allow to place containers
|
|
//in managed shared memory segments
|
|
typedef allocator<ValueType, managed_shared_memory::segment_manager>
|
|
ShmemAllocator;
|
|
|
|
//Alias a map of ints that uses the previous STL-like allocator.
|
|
//Note that the third parameter argument is the ordering function
|
|
//of the map, just like with std::map, used to compare the keys.
|
|
typedef map<KeyType, MappedType, std::less<KeyType>, ShmemAllocator> MyMap;
|
|
|
|
//Initialize the shared memory STL-compatible allocator
|
|
ShmemAllocator alloc_inst (segment.get_segment_manager());
|
|
|
|
//Construct a shared memory map.
|
|
//Note that the first parameter is the comparison function,
|
|
//and the second one the allocator.
|
|
//This the same signature as std::map's constructor taking an allocator
|
|
MyMap *mymap =
|
|
segment.construct<MyMap>("MyMap") //object name
|
|
(std::less<int>() //first ctor parameter
|
|
,alloc_inst); //second ctor parameter
|
|
|
|
//Insert data in the map
|
|
for(int i = 0; i < 100; ++i){
|
|
mymap->insert(std::pair<const int, float>(i, (float)i));
|
|
}
|
|
return 0;
|
|
}
|
|
//]
|
|
#include <boost/interprocess/detail/config_end.hpp>
|