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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/interprocess for documentation.
- //
- //////////////////////////////////////////////////////////////////////////////
- #if defined(BOOST_INTERPROCESS_MAPPED_FILES)
- #include <boost/interprocess/detail/config_begin.hpp>
- //[doc_managed_multiple_allocation
- #include <boost/interprocess/managed_shared_memory.hpp>
- #include <boost/move/utility_core.hpp> //boost::move
- #include <cassert>//assert
- #include <cstring>//std::memset
- #include <new> //std::nothrow
- #include <vector> //std::vector
- //<-
- #include "../test/get_process_id_name.hpp"
- //->
- int main()
- {
- using namespace boost::interprocess;
- typedef managed_shared_memory::multiallocation_chain multiallocation_chain;
- //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;
- //->
- //<-
- #if 1
- managed_shared_memory managed_shm(create_only,test::get_process_id_name(), 65536);
- #else
- //->
- managed_shared_memory managed_shm(create_only,"MySharedMemory", 65536);
- //<-
- #endif
- //->
- //Allocate 16 elements of 100 bytes in a single call. Non-throwing version.
- multiallocation_chain chain;
- managed_shm.allocate_many(std::nothrow, 100, 16, chain);
- //Check if the memory allocation was successful
- if(chain.empty()) return 1;
- //Allocated buffers
- std::vector<void*> allocated_buffers;
- //Initialize our data
- while(!chain.empty()){
- void *buf = chain.pop_front();
- allocated_buffers.push_back(buf);
- //The iterator must be incremented before overwriting memory
- //because otherwise, the iterator is invalidated.
- std::memset(buf, 0, 100);
- }
- //Now deallocate
- while(!allocated_buffers.empty()){
- managed_shm.deallocate(allocated_buffers.back());
- allocated_buffers.pop_back();
- }
- //Allocate 10 buffers of different sizes in a single call. Throwing version
- managed_shared_memory::size_type sizes[10];
- for(std::size_t i = 0; i < 10; ++i)
- sizes[i] = i*3;
- managed_shm.allocate_many(sizes, 10, 1, chain);
- managed_shm.deallocate_many(chain);
- return 0;
- }
- //]
- #include <boost/interprocess/detail/config_end.hpp>
- #else //#if defined(BOOST_INTERPROCESS_MAPPED_FILES)
- int main()
- {
- return 0;
- }
- #endif//#if defined(BOOST_INTERPROCESS_MAPPED_FILES)
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