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/** |
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* @file demo_write_array.cpp |
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* @author Vincent Berenz |
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* license License BSD-3-Clause |
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* @copyright Copyright (c) 2019, New York University and Max Planck |
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* Gesellschaft. |
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* @date 2019-05-22 |
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* |
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* @brief example of writing into interprocesses arrays |
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* |
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*/ |
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#include <signal.h> |
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#include <unistd.h> |
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#include "shared_memory/array.hpp" |
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#include "shared_memory/demos/item.hpp" |
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#define SIZE 4 |
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#define SEGMENT_SERIALIZED "demo_array_serialized" |
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#define SEGMENT_FUNDAMENTAL "demo_array_fundamental" |
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#define SEGMENT_FUNDAMENTAL_ARRAY "demo_array_fundamental_array" |
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static bool RUNNING = true; |
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void stop(int) |
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{ |
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RUNNING = false; |
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} |
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/** |
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* @brief create interprocesses arrays and write into them. Run demo_read_array |
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* for a process reading these arrays |
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*/ |
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void run() |
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{ |
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// in case a previous run did not exit properly |
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shared_memory::clear_array(SEGMENT_SERIALIZED); |
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shared_memory::clear_array(SEGMENT_FUNDAMENTAL); |
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shared_memory::clear_array(SEGMENT_FUNDAMENTAL_ARRAY); |
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// it will be safe to have another process |
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// reading/writting in the same array |
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bool mutex_protected = true; |
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// array declared in this files |
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// will wipe the shared memory on exit |
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bool clear_on_destruction = true; |
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// array of SIZE Item (Item being themselfs of size SIZE) |
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// Item implements a serialize function, and instances |
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// of items will be serialized into a string before being |
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// written in the shared memory |
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// see include/shared_memory/demos/item.hpp |
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shared_memory::array<shared_memory::Item<SIZE> > serialized( |
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SEGMENT_SERIALIZED, SIZE, mutex_protected, clear_on_destruction); |
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// array of SIZE integer |
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shared_memory::array<int> fundamental( |
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SEGMENT_FUNDAMENTAL, SIZE, mutex_protected, clear_on_destruction); |
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// array of array : SIZE * SIZE |
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shared_memory::array<int, SIZE> fundamental_array( |
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SEGMENT_FUNDAMENTAL_ARRAY, SIZE, mutex_protected, clear_on_destruction); |
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int count = 0; |
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shared_memory::Item<SIZE> item(0); |
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int values[SIZE]; |
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while (RUNNING) |
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{ |
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for (int i = 0; i < SIZE; i++) |
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{ |
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// writting items in serialized |
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item.fill(0); |
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item.set(i, count); |
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item.compact_print(); |
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serialized.set(i, item); |
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// writting integers in fundamental |
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fundamental.set(i, count); |
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// writting values in fundamental arrays |
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for (int j = 0; j < SIZE; j++) |
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{ |
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values[j] = 0; |
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} |
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values[i] = count; |
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fundamental_array.set(i, values); |
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} |
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std::cout << std::endl; |
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count++; |
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if (count == 10) |
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{ |
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count = 0; |
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} |
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usleep(100000); |
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} |
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} |
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int main() |
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{ |
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// stop on ctrl+c |
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struct sigaction cleaning; |
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cleaning.sa_handler = stop; |
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sigemptyset(&cleaning.sa_mask); |
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cleaning.sa_flags = 0; |
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sigaction(SIGINT, &cleaning, nullptr); |
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run(); |
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} |
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