| ////////////////////////////////////////////////////////////////////////////// |
| // |
| // (C) Copyright Ion Gaztanaga 2006-2009. 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> |
| //[doc_managed_multiple_allocation |
| #include <boost/interprocess/managed_shared_memory.hpp> |
| #include <boost/interprocess/detail/move.hpp> //boost::interprocess::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; |
| |
| //<- |
| #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(100, 16, std::nothrow)); |
| |
| //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.front(); |
| 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 |
| std::size_t sizes[10]; |
| for(std::size_t i = 0; i < 10; ++i) |
| sizes[i] = i*3; |
| |
| chain = managed_shm.allocate_many(sizes, 10); |
| managed_shm.deallocate_many(boost::interprocess::move(chain)); |
| return 0; |
| } |
| //] |
| #include <boost/interprocess/detail/config_end.hpp> |