shared_mutex.hpp

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#pragma once
 
#include <shared_mutex>
 
namespace wowlib {
#if defined(_WIN32) && defined(__GNUC__) && !defined(__clang__)
  class SharedMutex {
  public:
    SharedMutex() noexcept = default;
    SharedMutex(const SharedMutex&) = delete;
    SharedMutex& operator=(const SharedMutex&) = delete;

    void lock() noexcept;
    bool try_lock() noexcept;
    void unlock() noexcept;

    void lock_shared() noexcept;
    bool try_lock_shared() noexcept;
    void unlock_shared() noexcept;
 
  private:
    // SRWLOCK is a single pointer; SRWLOCK_INIT is the null pointer. Kept as
    // void* so this header never drags in <windows.h>.
    void* _lock = nullptr;
  };
#else
  using SharedMutex = std::shared_mutex;
#endif
}