/************************************************************************************

Filename    :   OVR_System.cpp
Content     :   General kernel initialization/cleanup, including that
                of the memory allocator.
Created     :   September 19, 2012
Notes       : 

Copyright   :   Copyright 2012 Oculus VR, Inc. All Rights reserved.

Use of this software is subject to the terms of the Oculus license
agreement provided at the time of installation or download, or which
otherwise accompanies this software in either electronic or hard copy form.

************************************************************************************/

#include "OVR_System.h"
#include "OVR_Threads.h"
#include "OVR_Timer.h"

namespace OVR {

// *****  OVR::System Implementation

// Initializes System core, installing allocator.
void System::Init(Log* log, Allocator *palloc)
{    
    if (!Allocator::GetInstance())
    {
        Log::SetGlobalLog(log);
        Timer::initializeTimerSystem();
        Allocator::setInstance(palloc);
    }
    else
    {
        OVR_DEBUG_LOG(("System::Init failed - duplicate call."));
    }
}

void System::Destroy()
{    
    if (Allocator::GetInstance())
    {
        // Wait for all threads to finish; this must be done so that memory
        // allocator and all destructors finalize correctly.
#ifdef OVR_ENABLE_THREADS
        Thread::FinishAllThreads();
#endif

        // Shutdown heap and destroy SysAlloc singleton, if any.
        Allocator::GetInstance()->onSystemShutdown();
        Allocator::setInstance(0);

        Timer::shutdownTimerSystem();
        Log::SetGlobalLog(Log::GetDefaultLog());
    }
    else
    {
        OVR_DEBUG_LOG(("System::Destroy failed - System not initialized."));
    }
}

// Returns 'true' if system was properly initialized.
bool System::IsInitialized()
{
    return Allocator::GetInstance() != 0;
}

} // OVR