76 lines
2.2 KiB
C++
76 lines
2.2 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_anonymous_upgradable_mutexA
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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 <boost/interprocess/sync/scoped_lock.hpp>
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#include "doc_upgradable_mutex_shared_data.hpp"
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#include <iostream>
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#include <cstdio>
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using namespace boost::interprocess;
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int main ()
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{
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//Remove shared memory on 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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} 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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shared_memory_object shm
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(create_only //only create
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,"MySharedMemory" //name
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,read_write //read-write mode
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);
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//Set size
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shm.truncate(sizeof(shared_data));
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//Map the whole shared memory in this process
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mapped_region region
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(shm //What to map
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,read_write //Map it as read-write
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);
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//Get the address of the mapped region
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void * addr = region.get_address();
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//Construct the shared structure in memory
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shared_data * data = new (addr) shared_data;
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//Write some logs
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for(int i = 0; i < shared_data::NumItems; ++i){
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//Lock the upgradable_mutex
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scoped_lock<interprocess_upgradable_mutex> lock(data->upgradable_mutex);
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std::sprintf(data->items[(data->current_line++) % shared_data::NumItems]
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,"%s_%d", "process_a", i);
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if(i == (shared_data::NumItems-1))
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data->end_a = true;
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//Mutex is released here
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}
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//Wait until the other process ends
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while(1){
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scoped_lock<interprocess_upgradable_mutex> lock(data->upgradable_mutex);
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if(data->end_b)
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break;
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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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