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80 lines
2.8 KiB
C++
80 lines
2.8 KiB
C++
//////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2006-2009. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/interprocess for documentation.
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//
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//////////////////////////////////////////////////////////////////////////////
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#include <boost/interprocess/detail/config_begin.hpp>
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#include <boost/interprocess/detail/workaround.hpp>
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//[run_doc_spawn_vector
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#include <boost/interprocess/managed_shared_memory.hpp>
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#include <boost/interprocess/containers/vector.hpp>
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#include <boost/interprocess/allocators/allocator.hpp>
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#include <string>
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#include <cstdlib> //std::system
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using namespace boost::interprocess;
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//Define an STL compatible allocator of ints that allocates from the managed_shared_memory.
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//This allocator will allow placing containers in the segment
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typedef allocator<int, managed_shared_memory::segment_manager> ShmemAllocator;
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//Alias a vector that uses the previous STL-like allocator so that allocates
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//its values from the segment
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typedef vector<int, ShmemAllocator> MyVector;
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//Main function. For parent process argc == 1, for child process argc == 2
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int main(int argc, char *argv[])
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{
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if(argc == 1){ //Parent process
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//Remove shared memory on construction and destruction
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struct shm_remove
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{
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shm_remove() { shared_memory_object::remove("MySharedMemory"); }
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~shm_remove(){ shared_memory_object::remove("MySharedMemory"); }
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} remover;
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//Create a new segment with given name and size
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managed_shared_memory segment(create_only ,"MySharedMemory", 65536);
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//Initialize shared memory STL-compatible allocator
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const ShmemAllocator alloc_inst (segment.get_segment_manager());
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//Construct a vector named "MyVector" in shared memory with argument alloc_inst
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MyVector *myvector = segment.construct<MyVector>("MyVector")(alloc_inst);
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for(int i = 0; i < 100; ++i) //Insert data in the vector
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myvector->push_back(i);
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//Launch child process
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std::string s(argv[0]); s += " child";
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if(0 != std::system(s.c_str()))
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return 1;
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//Check child has destroyed the vector
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if(segment.find<MyVector>("MyVector").first)
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return 1;
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}
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else{ //Child process
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//Open the managed segment
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managed_shared_memory segment(open_only, "MySharedMemory");
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//Find the vector using the c-string name
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MyVector *myvector = segment.find<MyVector>("MyVector").first;
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//Use vector in reverse order
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std::sort(myvector->rbegin(), myvector->rend());
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//When done, destroy the vector from the segment
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segment.destroy<MyVector>("MyVector");
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}
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return 0;
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};
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//]
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#include <boost/interprocess/detail/config_end.hpp>
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