1 ////////////////////////////////////////////////////////////////////////////// 2 // 3 // (C) Copyright Ion Gaztanaga 2006-2012. Distributed under the Boost 4 // Software License, Version 1.0. (See accompanying file 5 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 6 // 7 // See http://www.boost.org/libs/interprocess for documentation. 8 // 9 ////////////////////////////////////////////////////////////////////////////// 10 #include <boost/interprocess/detail/config_begin.hpp> 11 //[doc_anonymous_mutexB 12 #include <boost/interprocess/shared_memory_object.hpp> 13 #include <boost/interprocess/mapped_region.hpp> 14 #include <boost/interprocess/sync/scoped_lock.hpp> 15 #include "doc_anonymous_mutex_shared_data.hpp" 16 #include <iostream> 17 #include <cstdio> 18 19 using namespace boost::interprocess; 20 main()21int main () 22 { 23 //Remove shared memory on destruction 24 struct shm_remove 25 { 26 ~shm_remove(){ shared_memory_object::remove("MySharedMemory"); } 27 } remover; 28 //<- 29 (void)remover; 30 //-> 31 32 //Open the shared memory object. 33 shared_memory_object shm 34 (open_only //only create 35 ,"MySharedMemory" //name 36 ,read_write //read-write mode 37 ); 38 39 //Map the whole shared memory in this process 40 mapped_region region 41 (shm //What to map 42 ,read_write //Map it as read-write 43 ); 44 45 //Get the address of the mapped region 46 void * addr = region.get_address(); 47 48 //Construct the shared structure in memory 49 shared_memory_log * data = static_cast<shared_memory_log*>(addr); 50 51 //Write some logs 52 for(int i = 0; i < 100; ++i){ 53 //Lock the mutex 54 scoped_lock<interprocess_mutex> lock(data->mutex); 55 std::sprintf(data->items[(data->current_line++) % shared_memory_log::NumItems] 56 ,"%s_%d", "process_a", i); 57 if(i == (shared_memory_log::NumItems-1)) 58 data->end_b = true; 59 //Mutex is released here 60 } 61 62 //Wait until the other process ends 63 while(1){ 64 scoped_lock<interprocess_mutex> lock(data->mutex); 65 if(data->end_a) 66 break; 67 } 68 return 0; 69 } 70 //] 71 #include <boost/interprocess/detail/config_end.hpp> 72