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