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shared_memory.hpp
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shared_memory.hpp
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#pragma once
extern "C" {
#include <semaphore.h>
}
#include "communication_handler.hpp"
namespace ipc {
class SharedMemory : public ICommunicationHandler {
public:
/// Total amount slots in the buffer.
static constexpr short TOTAL_AMOUNT = 64;
/// Total amount of memory to use.
static constexpr int TOTAL_SIZE = BUFFER_SIZE * TOTAL_AMOUNT * sizeof(std::byte);
/**
* Create a new shared memory handler.
*
* @param name Name area or file.
* @param server Whether is object manages the memory.
* @param file Whether the name is a path.
*/
SharedMemory(std::string name, bool server, bool file = false);
/**
* Destructor for this object to cleanup data and close memory.
*/
~SharedMemory() override;
bool open() override;
bool close() override;
bool is_open() const override;
bool await_data() override;
bool has_data() const override;
bool write(const IDataObject &obj) override;
std::variant<std::tuple<DataHeader, DataObject>, CommunicationError> read() override;
/**
* Name or path of the memory.
*/
const std::string &name() const { return name_; }
/**
* Whether is handler manages the memory.
*/
bool server() const { return server_; }
/**
* Whether a mapped file is used.
*/
bool file() const { return file_; }
private:
const std::string name_;
const bool server_;
const bool file_;
int fd_ = -1;
int offset_ = 0;
std::byte *address_ = nullptr;
sem_t *reader_ = nullptr;
sem_t *writer_ = nullptr;
std::uint32_t last_id_ = 0;
std::array<std::byte, BUFFER_SIZE> buffer_{};
};
}