Pipe.h

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/*
 * Copyright (c) 2005 Palmsource, Inc.
 * 
 * This software is licensed as described in the file LICENSE, which
 * you should have received as part of this distribution. The terms
 * are also available at http://www.openbinder.org/license.html.
 * 
 * This software consists of voluntary contributions made by many
 * individuals. For the exact contribution history, see the revision
 * history and logs, available at http://www.openbinder.org
 */

#ifndef _SUPPORT_PIPE_H
#define _SUPPORT_PIPE_H

#include <support/ByteStream.h>
#include <support/Locker.h>
#include <support/ConditionVariable.h>

#if _SUPPORTS_NAMESPACE
namespace palmos {
namespace support {
#endif


class BPipe : public BnByteInput, public BnByteOutput
{
    BPipe (const BPipe &);
    BPipe &operator= (const BPipe &);

    size_t mSize;
    void *mBuffer;

    size_t mReadOffset,mWriteOffset;
    volatile int32_t mSpaceAvailable;

    volatile bool mPipeHalfClosed;

    SLocker mReadSerializer,mWriteSerializer;
    SConditionVariable mSpaceAvailableCV,mDataAvailableCV;

    protected:
        virtual ~BPipe();

        ssize_t PrvWrite (const void *data, size_t size, uint32_t flags);
        status_t PrvWriteEOS();

        ssize_t PrvRead (void *data, size_t size, uint32_t flags);

    public:

        BPipe (size_t size);
                
        virtual ssize_t ReadV (const struct iovec *vector, 
                                ssize_t count,
                                uint32_t flags = 0);

        virtual ssize_t WriteV (const struct iovec *vector, 
                                ssize_t count, 
                                uint32_t flags = 0);

        virtual status_t Sync();

        virtual SValue Inspect (const sptr<IBinder>& caller,
                                const SValue &which, 
                                uint32_t flags = 0);
};

#if _SUPPORTS_NAMESPACE
} } // namespace palmos::support
#endif

#endif // _SUPPORT_PIPE_H

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