/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
   file Copyright.txt or https://cmake.org/licensing for details.  */
#ifndef CM_THREAD_HXX
#define CM_THREAD_HXX

#include "cmConfigure.h" // IWYU pragma: keep
#include "cm_uv.h"

namespace cm {
class mutex
{
  CM_DISABLE_COPY(mutex)
  uv_mutex_t _M_;

public:
  mutex() { uv_mutex_init(&_M_); }
  ~mutex() { uv_mutex_destroy(&_M_); }

  void lock() { uv_mutex_lock(&_M_); }

  void unlock() { uv_mutex_unlock(&_M_); }
};

template <typename T>
class lock_guard
{
  T& _mutex;
  CM_DISABLE_COPY(lock_guard)

public:
  lock_guard(T& m)
    : _mutex(m)
  {
    _mutex.lock();
  }
  ~lock_guard() { _mutex.unlock(); }
};

class shared_mutex
{
  uv_rwlock_t _M_;
  CM_DISABLE_COPY(shared_mutex)

public:
  shared_mutex() { uv_rwlock_init(&_M_); }
  ~shared_mutex() { uv_rwlock_destroy(&_M_); }

  void lock() { uv_rwlock_wrlock(&_M_); }

  void unlock() { uv_rwlock_wrunlock(&_M_); }

  void lock_shared() { uv_rwlock_rdlock(&_M_); }

  void unlock_shared() { uv_rwlock_rdunlock(&_M_); }
};

template <typename T>
class shared_lock
{
  T& _mutex;
  CM_DISABLE_COPY(shared_lock)

public:
  shared_lock(T& m)
    : _mutex(m)
  {
    _mutex.lock_shared();
  }
  ~shared_lock() { _mutex.unlock_shared(); }
};

template <typename T>
class unique_lock : public lock_guard<T>
{
  CM_DISABLE_COPY(unique_lock)

public:
  unique_lock(T& m)
    : lock_guard<T>(m)
  {
  }
};
}
#endif