mutex.h

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/*
* (C) 2016 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
 
#ifndef BOTAN_UTIL_MUTEX_H_
#define BOTAN_UTIL_MUTEX_H_
 
#include <botan/types.h>
 
#if defined(BOTAN_TARGET_OS_HAS_THREADS)
   #include <mutex>
#endif
 
namespace Botan {
 
#if defined(BOTAN_TARGET_OS_HAS_THREADS)
 
/// The mutex type used by the library
using mutex_type = std::mutex;
 
/// The recursive mutex type used by the library
using recursive_mutex_type = std::recursive_mutex;
 
template <typename T>
using lock_guard_type = std::scoped_lock<T>;
 
#else
 
// No threads
 
class noop_mutex final {
   public:
      void lock() {}
 
      void unlock() {}
};
 
using mutex_type = noop_mutex;
using recursive_mutex_type = noop_mutex;
 
template <typename Mutex>
class lock_guard final {
   public:
      explicit lock_guard(Mutex& m) : m_mutex(m) { m_mutex.lock(); }
 
      ~lock_guard() { m_mutex.unlock(); }
 
      lock_guard(const lock_guard& other) = delete;
      lock_guard& operator=(const lock_guard& other) = delete;
 
   private:
      Mutex& m_mutex;
};
 
template <typename T>
using lock_guard_type = lock_guard<T>;
 
#endif
 
}  // namespace Botan
 
#endif