{

try{

//Remove shared memory on construction and destruction

struct shm_remove

{

shm_remove() { shared_memory_object::remove("MySharedMemory"); }

~shm_remove(){ shared_memory_object::remove("MySharedMemory"); }

} remover;

//<-

(void)remover;

//->

//Create a shared memory object.

shared_memory_object shm

(create_only //only create

,"MySharedMemory" //name

,read_write //read-write mode

);

//Set size

shm.truncate(sizeof(shared_memory_log));

//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_memory_log * data = new (addr) shared_memory_log;

//Write some logs

for(int i = 0; i < shared_memory_log::NumItems; ++i){

//Lock the mutex

scoped_lock<interprocess_mutex> lock(data->mutex);

std::sprintf(data->items[(data->current_line++) % shared_memory_log::NumItems]

,"%s_%d", "process_a", i);

if(i == (shared_memory_log::NumItems-1))

data->end_a = true;

//Mutex is released here

}

//Wait until the other process ends

while(1){

scoped_lock<interprocess_mutex> lock(data->mutex);

if(data->end_b)

break;

}

}

catch(interprocess_exception &ex){

std::cout << ex.what() << std::endl;

return 1;

}

return 0;