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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_anonymous_upgradable_mutexB
- #include <boost/interprocess/shared_memory_object.hpp>
- #include <boost/interprocess/mapped_region.hpp>
- #include <boost/interprocess/sync/scoped_lock.hpp>
- #include "doc_upgradable_mutex_shared_data.hpp"
- #include <iostream>
- #include <cstdio>
- using namespace boost::interprocess;
- int main ()
- {
- //Remove shared memory on destruction
- struct shm_remove
- {
- ~shm_remove(){ shared_memory_object::remove("MySharedMemory"); }
- } remover;
- //<-
- (void)remover;
- //->
- //Open the shared memory object.
- shared_memory_object shm
- (open_only //only create
- ,"MySharedMemory" //name
- ,read_write //read-write mode
- );
- //Map the whole shared memory in this process
- mapped_region region
- (shm //What to map
- ,read_write //Map it as read-write
- );
- //Get the address of the mapped region
- void * addr = region.get_address();
- //Construct the shared structure in memory
- shared_data * data = static_cast<shared_data*>(addr);
- //Write some logs
- for(int i = 0; i < 100; ++i){
- //Lock the upgradable_mutex
- scoped_lock<interprocess_upgradable_mutex> lock(data->upgradable_mutex);
- std::sprintf(data->items[(data->current_line++) % shared_data::NumItems]
- ,"%s_%d", "process_a", i);
- if(i == (shared_data::NumItems-1))
- data->end_b = true;
- //Mutex is released here
- }
- //Wait until the other process ends
- while(1){
- scoped_lock<interprocess_upgradable_mutex> lock(data->upgradable_mutex);
- if(data->end_a)
- break;
- }
- return 0;
- }
- //]
- #include <boost/interprocess/detail/config_end.hpp>
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