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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.
- //
- //////////////////////////////////////////////////////////////////////////////
- #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;
- //<-
- (void)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>
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