| ////////////////////////////////////////////////////////////////////////////// |
| // |
| // (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_aligned_allocation |
| #include <boost/interprocess/managed_shared_memory.hpp> |
| #include <cassert> |
| //<- |
| #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; |
| |
| //Managed memory segment that allocates portions of a shared memory |
| //segment with the default management algorithm |
| //<- |
| #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 |
| //-> |
| |
| const std::size_t Alignment = 128; |
| |
| //Allocate 100 bytes aligned to Alignment from segment, throwing version |
| void *ptr = managed_shm.allocate_aligned(100, Alignment); |
| |
| //Check alignment |
| assert((static_cast<char*>(ptr)-static_cast<char*>(0)) % Alignment == 0); |
| |
| //Deallocate it |
| managed_shm.deallocate(ptr); |
| |
| //Non throwing version |
| ptr = managed_shm.allocate_aligned(100, Alignment, std::nothrow); |
| |
| //Check alignment |
| assert((static_cast<char*>(ptr)-static_cast<char*>(0)) % Alignment == 0); |
| |
| //Deallocate it |
| managed_shm.deallocate(ptr); |
| |
| //If we want to efficiently allocate aligned blocks of memory |
| //use managed_shared_memory::PayloadPerAllocation value |
| assert(Alignment > managed_shared_memory::PayloadPerAllocation); |
| |
| //This allocation will maximize the size of the aligned memory |
| //and will increase the possibility of finding more aligned memory |
| ptr = managed_shm.allocate_aligned |
| (3*Alignment - managed_shared_memory::PayloadPerAllocation, Alignment); |
| |
| //Check alignment |
| assert((static_cast<char*>(ptr)-static_cast<char*>(0)) % Alignment == 0); |
| |
| //Deallocate it |
| managed_shm.deallocate(ptr); |
| |
| return 0; |
| } |
| //] |
| /* |
| |
| #include <vector> |
| #include <boost/interprocess/managed_windows_shared_memory.hpp> |
| |
| int main() |
| { |
| using namespace boost::interprocess; |
| typedef boost::interprocess:: |
| managed_windows_shared_memory shared_segment; |
| |
| std::vector<void *> ptrs; |
| shared_segment m_segment(create_only, "shmem", 4096*16); |
| try{ |
| while(1){ |
| //Now I have several allocate_aligned operations: |
| ptrs.push_back(m_segment.allocate_aligned(128, 128)); |
| } |
| } |
| catch(...){ |
| m_segment.deallocate(ptrs.back()); |
| ptrs.pop_back(); |
| ptrs.push_back(m_segment.allocate_aligned(128, 128)); |
| } |
| return 0; |
| } |
| */ |
| #include <boost/interprocess/detail/config_end.hpp> |