98 lines
2.7 KiB
C++
98 lines
2.7 KiB
C++
//////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2006-2012. 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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//[doc_shared_memory
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#include <boost/interprocess/shared_memory_object.hpp>
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#include <boost/interprocess/mapped_region.hpp>
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#include <cstring>
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#include <cstdlib>
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#include <string>
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//<-
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#include "../test/get_process_id_name.hpp"
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//->
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int main(int argc, char *argv[])
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{
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using namespace boost::interprocess;
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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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//<-
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#if 1
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shm_remove() { shared_memory_object::remove(test::get_process_id_name()); }
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~shm_remove(){ shared_memory_object::remove(test::get_process_id_name()); }
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#else
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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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//<-
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#endif
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//->
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} remover;
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//<-
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(void)remover;
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//->
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//Create a shared memory object.
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//<-
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#if 1
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shared_memory_object shm (create_only, test::get_process_id_name(), read_write);
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#else
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//->
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shared_memory_object shm (create_only, "MySharedMemory", read_write);
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//<-
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#endif
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//->
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//Set size
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shm.truncate(1000);
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//Map the whole shared memory in this process
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mapped_region region(shm, read_write);
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//Write all the memory to 1
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std::memset(region.get_address(), 1, region.get_size());
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//Launch child process
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std::string s(argv[0]); s += " child ";
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//<-
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s += test::get_process_id_name();
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//->
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if(0 != std::system(s.c_str()))
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return 1;
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}
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else{
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//Open already created shared memory object.
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//<-
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#if 1
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shared_memory_object shm (open_only, argv[2], read_only);
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#else
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//->
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shared_memory_object shm (open_only, "MySharedMemory", read_only);
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//<-
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#endif
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//->
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//Map the whole shared memory in this process
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mapped_region region(shm, read_only);
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//Check that memory was initialized to 1
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char *mem = static_cast<char*>(region.get_address());
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for(std::size_t i = 0; i < region.get_size(); ++i)
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if(*mem++ != 1)
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return 1; //Error checking memory
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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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