96 lines
2.6 KiB
C++
96 lines
2.6 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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#include <boost/interprocess/detail/workaround.hpp>
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#if defined(BOOST_INTERPROCESS_XSI_SHARED_MEMORY_OBJECTS) || defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
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//[doc_xsi_shared_memory
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#include <boost/interprocess/xsi_shared_memory.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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using namespace boost::interprocess;
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void remove_old_shared_memory(const xsi_key &key)
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{
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try{
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xsi_shared_memory xsi(open_only, key);
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xsi_shared_memory::remove(xsi.get_shmid());
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}
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catch(interprocess_exception &e){
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if(e.get_error_code() != not_found_error)
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throw;
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}
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}
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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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//Build XSI key (ftok based)
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xsi_key key(argv[0], 1);
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remove_old_shared_memory(key);
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//Create a shared memory object.
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xsi_shared_memory shm (create_only, key, 1000);
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//Remove shared memory on destruction
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struct shm_remove
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{
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int shmid_;
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shm_remove(int shmid) : shmid_(shmid){}
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~shm_remove(){ xsi_shared_memory::remove(shmid_); }
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} remover(shm.get_shmid());
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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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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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//Build XSI key (ftok based)
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xsi_key key(argv[0], 1);
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//Create a shared memory object.
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xsi_shared_memory shm (open_only, key);
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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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#else //BOOST_INTERPROCESS_XSI_SHARED_MEMORY_OBJECTS
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int main()
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{
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return 0;
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}
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#endif //BOOST_INTERPROCESS_XSI_SHARED_MEMORY_OBJECTS
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#include <boost/interprocess/detail/config_end.hpp>
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