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/*************************************************
* Mutex Source File *
* (C) 1999-2007 The Botan Project *
*************************************************/
#include <botan/mutex.h>
#include <botan/libstate.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();
}
/*************************************************
* Named_Mutex_Holder Constructor *
*************************************************/
Named_Mutex_Holder::Named_Mutex_Holder(const std::string& name) :
mutex_name(name)
{
global_state().get_named_mutex(mutex_name)->lock();
}
/*************************************************
* Named_Mutex_Holder Destructor *
*************************************************/
Named_Mutex_Holder::~Named_Mutex_Holder()
{
global_state().get_named_mutex(mutex_name)->unlock();
}
/*************************************************
* Default Mutex Factory *
*************************************************/
Mutex* Default_Mutex_Factory::make()
{
class Default_Mutex : public Mutex
{
public:
class Mutex_State_Error : public Internal_Error
{
public:
Mutex_State_Error(const std::string& where) :
Internal_Error("Default_Mutex::" + where + ": " +
"Mutex is already " + where + "ed") {}
};
void lock()
{
if(locked)
throw Mutex_State_Error("lock");
locked = true;
}
void unlock()
{
if(!locked)
throw Mutex_State_Error("unlock");
locked = false;
}
Default_Mutex() { locked = false; }
private:
bool locked;
};
return new Default_Mutex;
}
}
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