/*
* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
* All rights reserved.
* This component and the accompanying materials are made available
* under the terms of "Eclipse Public License v1.0"
* which accompanies this distribution, and is available
* at the URL "http://www.eclipse.org/legal/epl-v10.html".
*
* Initial Contributors:
* Nokia Corporation - initial contribution.
*
* Contributors:
*
* Description: 
*
*/

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>

#include "xathreadsyncitf.h"

/**
 * Base interface XAThreadSyncItf Implementation
 */
XAresult XAThreadSyncItfImpl_EnterCriticalSection(XAThreadSyncItf self)
{
    XAresult ret = XA_RESULT_SUCCESS;
    XAThreadSyncItfImpl* impl = NULL;

    DEBUG_API("->XAThreadSyncItfImpl_EnterCriticalSection");

    impl = (XAThreadSyncItfImpl*)(*self);
    if( !impl || impl != impl->self )
    {
        DEBUG_ERR("XA_RESULT_PARAMETER_INVALID");
        DEBUG_API("<-XAThreadSyncItfImpl_EnterCriticalSection");
        return XA_RESULT_PARAMETER_INVALID;
    }

    if( impl->engInCritical )
    {
        /* The calling context must not already be in
           critical section state. */
        DEBUG_ERR("XA_RESULT_PRECONDITIONS_VIOLATED");
        ret = XA_RESULT_PRECONDITIONS_VIOLATED;
    }
    else
    {
        ret = XAImpl_LockMutex( impl->engCriticalSection );
        if(ret == XA_RESULT_SUCCESS)
        {
            impl->engInCritical = XA_BOOLEAN_TRUE;
        }
    }
    DEBUG_API("<-XAThreadSyncItfImpl_EnterCriticalSection");
    return ret;
}

XAresult XAThreadSyncItfImpl_ExitCriticalSection(XAThreadSyncItf self)
{
    XAThreadSyncItfImpl* impl = NULL;
    XAresult ret = XA_RESULT_SUCCESS;

    impl = (XAThreadSyncItfImpl*)(*self);
    DEBUG_API("->XAThreadSyncItfImpl_ExitCriticalSection");

    if( !impl || impl != impl->self )
    {
        DEBUG_ERR("XA_RESULT_PARAMETER_INVALID");
        DEBUG_API("<-XAThreadSyncItfImpl_ExitCriticalSection");
        return XA_RESULT_PARAMETER_INVALID;
    }

    if( impl->engInCritical  )
    {
        ret = XAImpl_UnlockMutex( impl->engCriticalSection );
        if(ret == XA_RESULT_SUCCESS)
        {
            impl->engInCritical = XA_BOOLEAN_FALSE;
        }
    }
    else
    {
        /* The engine must be in critical section state */
        DEBUG_ERR("XA_RESULT_PRECONDITIONS_VIOLATED");
        ret = XA_RESULT_PRECONDITIONS_VIOLATED;
    }
    DEBUG_API("<-XAThreadSyncItfImpl_ExitCriticalSection");
    return ret;
}

/**
 * XAThreadSyncItfImpl -specific methods
 **/

XAThreadSyncItfImpl* XAThreadSyncItfImpl_Create()
{
    XAThreadSyncItfImpl *self = NULL;
    DEBUG_API("->XAThreadSyncItfImpl_Create");

    self = (XAThreadSyncItfImpl*)calloc(1,sizeof(XAThreadSyncItfImpl));

    if( self )
    {
        /* init itf default implementation */
        self->itf.EnterCriticalSection = XAThreadSyncItfImpl_EnterCriticalSection;
        self->itf.ExitCriticalSection = XAThreadSyncItfImpl_ExitCriticalSection;

        if( XAImpl_CreateMutex( &(self->engCriticalSection) )
            != XA_RESULT_SUCCESS )
        {
            DEBUG_ERR("Mutex creation failed, abort");
            free(self);
            DEBUG_API("<-XAThreadSyncItfImpl_Create");
            return NULL;
        }

        self->self = self;
    }
    DEBUG_API("<-XAThreadSyncItfImpl_Create");
    return self;
}

void XAThreadSyncItfImpl_Free(XAThreadSyncItfImpl* self)
{
    DEBUG_API("->XAThreadSyncItfImpl_Free");
    assert(self==self->self);
    XAImpl_DeleteMutex(self->engCriticalSection);
    free(self);
    DEBUG_API("<-XAThreadSyncItfImpl_Free");
}