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PxTask.h

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//  * Redistributions in binary form must reproduce the above copyright
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//    documentation and/or other materials provided with the distribution.
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//    contributors may be used to endorse or promote products derived
//    from this software without specific prior written permission.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// Copyright (c) 2008-2018 NVIDIA Corporation. All rights reserved.

#ifndef PXTASK_PXTASK_H
#define PXTASK_PXTASK_H

#include "task/PxTaskDefine.h"
#include "task/PxTaskManager.h"
#include "task/PxCpuDispatcher.h"
#include "task/PxGpuDispatcher.h"
#include "foundation/PxAssert.h"

namespace physx
{

class PxBaseTask
{
public:
    PxBaseTask() : mContextID(0), mTm(NULL) {}
    virtual ~PxBaseTask() {}

    virtual void        run() = 0;

    virtual const char* getName() const = 0;

    virtual void        addReference() = 0;
    virtual void        removeReference() = 0;
    virtual int32_t     getReference() const = 0;

    virtual void        release() = 0;

    PX_FORCE_INLINE PxTaskManager* getTaskManager() const
    {
        return mTm;
    }

    PX_FORCE_INLINE void    setContextId(PxU64 id)          { mContextID = id;      }
    PX_FORCE_INLINE PxU64   getContextId()          const   { return mContextID;    }

protected:
    PxU64               mContextID;     
    PxTaskManager*      mTm;            

    friend class PxTaskMgr;
};


class PxTask : public PxBaseTask
{
public:
    PxTask() : mTaskID(0) {}
    virtual ~PxTask() {}

    virtual void release()
    {
        PX_ASSERT(mTm);

        // clear mTm before calling taskCompleted() for safety
        PxTaskManager* save = mTm;
        mTm = NULL;
        save->taskCompleted( *this );
    }

    //         task is allowed to start.
    PX_INLINE void finishBefore( PxTaskID taskID )
    {
        PX_ASSERT(mTm);
        mTm->finishBefore( *this, taskID);
    }

    //         task has completed.
    PX_INLINE void startAfter( PxTaskID taskID )
    {
        PX_ASSERT(mTm);
        mTm->startAfter( *this, taskID );
    }

    PX_INLINE void addReference()
    {
        PX_ASSERT(mTm);
        mTm->addReference( mTaskID );
    }

    PX_INLINE void removeReference()
    {
        PX_ASSERT(mTm);
        mTm->decrReference( mTaskID );
    }

    PX_INLINE int32_t getReference() const
    {
        return mTm->getReference( mTaskID );
    }
    
    PX_INLINE PxTaskID      getTaskID() const
    {
        return mTaskID;
    }

    virtual void submitted()
    {
        mStreamIndex = 0;
        mPreSyncRequired = false;
    }

    PX_INLINE void      requestSyncPoint()
    {
        mPreSyncRequired = true;
    }


protected:
    PxTaskID            mTaskID;            
    uint32_t            mStreamIndex;       
    bool                mPreSyncRequired;   

    friend class PxTaskMgr;
    friend class PxGpuWorkerThread;
};


class PxLightCpuTask : public PxBaseTask
{
public:
    PxLightCpuTask()
        : mCont( NULL )
        , mRefCount( 0 )
    {
    }
    virtual ~PxLightCpuTask()
    {
        mTm = NULL;
    }

    PX_INLINE void setContinuation(PxTaskManager& tm, PxBaseTask* c)
    {
        PX_ASSERT( mRefCount == 0 );
        mRefCount = 1;
        mCont = c;
        mTm = &tm;
        if( mCont )
        {
            mCont->addReference();
        }
    }

    PX_INLINE void setContinuation( PxBaseTask* c )
    {
        PX_ASSERT( c );
        PX_ASSERT( mRefCount == 0 );
        mRefCount = 1;
        mCont = c;
        if( mCont )
        {
            mCont->addReference();
            mTm = mCont->getTaskManager();
            PX_ASSERT( mTm );
        }
    }

    PX_INLINE PxBaseTask*   getContinuation()   const
    {
        return mCont;
    }

    PX_INLINE void removeReference()
    {
        mTm->decrReference(*this);
    }

    PX_INLINE int32_t getReference() const
    {
        return mRefCount;
    }

    PX_INLINE void addReference()
    {
        mTm->addReference(*this);
    }

    PX_INLINE void release()
    {
        if( mCont )
        {
            mCont->removeReference();
        }
    }

protected:

    PxBaseTask*         mCont;          
    volatile int32_t    mRefCount;      

    friend class PxTaskMgr;
};


}// end physx namespace


#endif // PXTASK_PXTASK_H

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