inter_process_lock.hpp

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#pragma once
 
// Inter-process file lock — prevents multiple processes from accessing
// the same resource simultaneously.
 
#include <cstdint>
#include <string>
#include <string_view>
 
namespace pulp::runtime {
 
class InterProcessLock {
 
  public:
    explicit InterProcessLock(std::string_view name);
    ~InterProcessLock();

    bool try_lock();

    bool try_lock_shared();

    void unlock();

    bool is_locked() const {
        return mode_ != Mode::Unlocked;
    }
 
    // No copy or move
    InterProcessLock(const InterProcessLock&) = delete;
    InterProcessLock& operator=(const InterProcessLock&) = delete;
 
  private:
    std::string lock_path_;
    enum class Mode : std::uint8_t { Unlocked, Shared, Exclusive };
    Mode mode_ = Mode::Unlocked;
#ifdef _WIN32
    void* handle_ = nullptr;
#else
    int fd_ = -1;
#endif
};
 
} // namespace pulp::runtime