system_shared_memory.cpp

Shared memory manager example

 
#include "system/shared_memory.h"
 
#include <algorithm>
#include <cstring>
#include <iostream>
 
int main(int argc, char** argv)
{
    // Create or open a shared memory buffer
    CppCommon::SharedMemory buffer("shared_memory_example", 1024);
    if (buffer.owner())
        std::cout << "SharedMemory created!" << std::endl;
    else
        std::cout << "SharedMemory opened! Value = " << (char*)buffer.ptr() << std::endl;
 
    // Show help message
    std::cout << "Please enter anything to put into shared memory (several processes support). Enter '0' to exit..." << std::endl;
 
    // Perform text input
    std::string line;
    while (getline(std::cin, line))
    {
        if (line == "0")
            break;
 
        // Show the old shared memory buffer content
        std::cout << "Old shared memory value = " << (char*)buffer.ptr() << std::endl;
 
        // Write text input into the shared memory buffer
        std::memcpy(buffer.ptr(), line.c_str(), std::min(line.size() + 1, buffer.size()));
 
        // Show the new shared memory buffer content
        std::cout << "New shared memory value = " << (char*)buffer.ptr() << std::endl;
    }
 
    return 0;
}