/*************************************************
* Mutex Source File                              *
* (C) 1999-2006 The Botan Project                *
*************************************************/

#include <botan/mutex.h>

namespace Botan {

/*************************************************
* Mutex_Holder Constructor                       *
*************************************************/
Mutex_Holder::Mutex_Holder(Mutex* m) : mux(m)
   {
   if(!mux)
      throw Invalid_Argument("Mutex_Holder: Argument was NULL");
   mux->lock();
   }

/*************************************************
* Mutex_Holder Destructor                        *
*************************************************/
Mutex_Holder::~Mutex_Holder()
   {
   mux->unlock();
   }

/*************************************************
* Default Mutex Factory                          *
*************************************************/
Mutex* Mutex_Factory::make()
   {
   class Default_Mutex : public Mutex
      {
      public:
         void lock()
            {
            if(locked)
               throw Internal_Error("Default_Mutex::lock: Mutex is already locked");
            locked = true;
            }

         void unlock()
            {
            if(!locked)
               throw Internal_Error("Default_Mutex::unlock: Mutex is already unlocked");
            locked = false;
            }

         Default_Mutex() { locked = false; }
      private:
         bool locked;
      };

   return new Default_Mutex;
   }

}