mutex.hpp

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#pragma once
 
#include <atomic>
#include <cstddef>
#include <cstdint>
#include <limits>
 
#include "expected.hpp"
#include "resource_id.hpp"
#include "task_control_block.hpp"
 
class Mutex {
 public:
  const char* name{"unnamed_mutex"};
 
  [[nodiscard]] auto Lock() -> Expected<void>;
 
  [[nodiscard]] auto UnLock() -> Expected<void>;
 
  [[nodiscard]] auto TryLock() -> Expected<void>;
 
  [[nodiscard]] auto IsLockedByCurrentTask() const -> bool;
 
  explicit Mutex(const char* _name)
      : name(_name),
        resource_id_(ResourceType::kMutex, reinterpret_cast<uint64_t>(this)) {}
  Mutex() = default;
 
  Mutex(const Mutex&) = delete;
  Mutex(Mutex&&) = delete;
  auto operator=(const Mutex&) -> Mutex& = delete;
  auto operator=(Mutex&&) -> Mutex& = delete;
  ~Mutex() = default;
 
 protected:
  std::atomic<bool> locked_{false};
 
  std::atomic<Pid> owner_{std::numeric_limits<Pid>::max()};
 
  ResourceId resource_id_{};
};