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/*
* Global State Management
* (C) 2010 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/global_state.h>
#include <botan/libstate.h>
namespace Botan {
/*
* @todo There should probably be a lock to avoid racy manipulation
* of the state among different threads
*/
namespace Global_State_Management {
/*
* Botan's global state
*/
namespace {
Library_State* global_lib_state = 0;
}
/*
* Access the global state object
*/
Library_State& global_state()
{
/* Lazy initialization. Botan still needs to be deinitialized later
on or memory might leak.
*/
if(!global_lib_state)
{
global_lib_state = new Library_State;
global_lib_state->initialize();
}
return (*global_lib_state);
}
/*
* Set a new global state object
*/
void set_global_state(Library_State* new_state)
{
delete swap_global_state(new_state);
}
/*
* Set a new global state object unless one already existed
*/
bool set_global_state_unless_set(Library_State* new_state)
{
if(global_lib_state)
{
delete new_state;
return false;
}
else
{
delete swap_global_state(new_state);
return true;
}
}
/*
* Swap two global state objects
*/
Library_State* swap_global_state(Library_State* new_state)
{
Library_State* old_state = global_lib_state;
global_lib_state = new_state;
return old_state;
}
/*
* Query if library is initialized
*/
bool global_state_exists()
{
return (global_lib_state != 0);
}
}
}
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