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/** |
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* @file demo_read_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 reading from 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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void print_array(int* values, int size) |
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{ |
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for (int i = 0; i < size; i++) |
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{ |
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std::cout << values[i] << " "; |
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} |
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} |
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/** |
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* @brief read from the array created by demo_write_array, which |
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* should have been started before this demo was |
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* (infinite hanging expected otherwise) |
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*/ |
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void run() |
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{ |
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bool mutex_protected = true; |
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// because done in demo_write_array |
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bool clear_on_destruction = false; |
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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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shared_memory::array<int> fundamental( |
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SEGMENT_FUNDAMENTAL, SIZE, mutex_protected, clear_on_destruction); |
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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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shared_memory::Item<SIZE> item; |
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int values[SIZE]; |
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int value; |
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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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serialized.get(i, item); |
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fundamental.get(i, value); |
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fundamental_array.get(i, values); |
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item.compact_print(); |
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std::cout << " | " << value << " | "; |
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print_array(values, SIZE); |
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std::cout << " | "; |
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} |
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std::cout << std::endl; |
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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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