khronosfws/openmax_al/src/engine/xathreadsyncitf.c
author hgs
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/*
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 * Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
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 * All rights reserved.
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 * This component and the accompanying materials are made available
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 * under the terms of "Eclipse Public License v1.0"
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 * which accompanies this distribution, and is available
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 * at the URL "http://www.eclipse.org/legal/epl-v10.html".
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 *
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 * Initial Contributors:
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 * Nokia Corporation - initial contribution.
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 *
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 * Contributors:
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 *
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 * Description: ThreadSync Itf Implementation
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 *
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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#include "xathreadsyncitf.h"
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/**
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 * Base interface XAThreadSyncItf Implementation
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 */
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XAresult XAThreadSyncItfImpl_EnterCriticalSection(XAThreadSyncItf self)
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    {
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    XAresult ret = XA_RESULT_SUCCESS;
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    XAThreadSyncItfImpl* impl = NULL;
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    DEBUG_API("->XAThreadSyncItfImpl_EnterCriticalSection");
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    impl = (XAThreadSyncItfImpl*) (*self);
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    if (!impl || impl != impl->self)
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        {
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        DEBUG_ERR("XA_RESULT_PARAMETER_INVALID");
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        DEBUG_API("<-XAThreadSyncItfImpl_EnterCriticalSection");
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        return XA_RESULT_PARAMETER_INVALID;
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        }
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    if (impl->engInCritical)
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        {
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        /* The calling context must not already be in
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         critical section state. */
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        DEBUG_ERR("XA_RESULT_PRECONDITIONS_VIOLATED");
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        ret = XA_RESULT_PRECONDITIONS_VIOLATED;
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        }
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    else
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        {
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        ret = XAImpl_LockMutex(impl->engCriticalSection);
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        if (ret == XA_RESULT_SUCCESS)
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            {
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            impl->engInCritical = XA_BOOLEAN_TRUE;
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            }
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        }DEBUG_API("<-XAThreadSyncItfImpl_EnterCriticalSection");
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    return ret;
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    }
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XAresult XAThreadSyncItfImpl_ExitCriticalSection(XAThreadSyncItf self)
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    {
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    XAThreadSyncItfImpl* impl = NULL;
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    XAresult ret = XA_RESULT_SUCCESS;
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    impl = (XAThreadSyncItfImpl*) (*self);
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    DEBUG_API("->XAThreadSyncItfImpl_ExitCriticalSection");
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    if (!impl || impl != impl->self)
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        {
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        DEBUG_ERR("XA_RESULT_PARAMETER_INVALID");
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        DEBUG_API("<-XAThreadSyncItfImpl_ExitCriticalSection");
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        return XA_RESULT_PARAMETER_INVALID;
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        }
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    if (impl->engInCritical)
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        {
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        ret = XAImpl_UnlockMutex(impl->engCriticalSection);
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        if (ret == XA_RESULT_SUCCESS)
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            {
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            impl->engInCritical = XA_BOOLEAN_FALSE;
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            }
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        }
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    else
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        {
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        /* The engine must be in critical section state */
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        DEBUG_ERR("XA_RESULT_PRECONDITIONS_VIOLATED");
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        ret = XA_RESULT_PRECONDITIONS_VIOLATED;
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        }DEBUG_API("<-XAThreadSyncItfImpl_ExitCriticalSection");
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    return ret;
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    }
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/**
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 * XAThreadSyncItfImpl -specific methods
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 **/
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XAThreadSyncItfImpl* XAThreadSyncItfImpl_Create()
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    {
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    XAThreadSyncItfImpl *self = NULL;
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    DEBUG_API("->XAThreadSyncItfImpl_Create");
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    self = (XAThreadSyncItfImpl*) calloc(1, sizeof(XAThreadSyncItfImpl));
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    if (self)
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        {
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        /* init itf default implementation */
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        self->itf.EnterCriticalSection
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                = XAThreadSyncItfImpl_EnterCriticalSection;
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        self->itf.ExitCriticalSection
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                = XAThreadSyncItfImpl_ExitCriticalSection;
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        if (XAImpl_CreateMutex(&(self->engCriticalSection))
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                != XA_RESULT_SUCCESS)
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            {
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            DEBUG_ERR("Mutex creation failed, abort");
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            free(self);
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            DEBUG_API("<-XAThreadSyncItfImpl_Create");
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            return NULL;
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            }
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        self->self = self;
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        }
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    DEBUG_API("<-XAThreadSyncItfImpl_Create");
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    return self;
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    }
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void XAThreadSyncItfImpl_Free(XAThreadSyncItfImpl* self)
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    {
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    DEBUG_API("->XAThreadSyncItfImpl_Free");
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    assert(self==self->self);
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    if(self)
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        {
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        XAImpl_DeleteMutex(self->engCriticalSection);
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        free(self);
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        }
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    DEBUG_API("<-XAThreadSyncItfImpl_Free");
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    }
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