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java.lang.Object
   |
   +----utah.npm.core.IPCPayload

Summary

public class  IPCPayload
     extends java.lang.Object
{
          // Fields 18
     public byte[] recvBuf;
     public int recvBufEnd;
     public int recvBufStart;
     public Object[] recvObjTab;
     public int recvObjTabEnd;
     public int recvObjTabStart;
     public Reference[] recvRefTab;
     public int recvRefTabEnd;
     public int recvRefTabStart;
     public byte[] sendBuf;
     public int sendBufEnd;
     public int sendBufStart;
     public Object[] sendObjTab;
     public int sendObjTabEnd;
     public int sendObjTabStart;
     public Reference[] sendRefTab;
     public int sendRefTabEnd;
     public int sendRefTabStart;

          // Constructors 1
     public IPCPayload();

          // Methods 1
     protected Object clone() throws CloneNotSupportedException, OutOfMemoryError;
}

IPCPayload defines the data to send in an IPC operation and/or to receive in an operation.

There are send/recv pairs for data (*Buf), NPM References (*RefTab), and arbitrary Java objects (*ObjTab). For each type of data, the associated *Start and *Length parameters define the start offset in the buffer and the end offset. After a successful receive, the recv*Start field will point to the end of the received data. After a successful send, the send*Start field will point to the end of the data sent. This means that for partially completed sends and receives, the IPCPayload buffers will be all set to resume the operation at the point of interruption.

There are no public methods in this class. Just set the defined objects as you need.

All of the return codes used are defined in the ThreadIPC class.

TODO: The copy function really should be native methods

Version:

NPMJava 0.5.0 April, 1998

Author:

Patrick Tullmann tullmann@cs.utah.edu

See Also: IPC, ThreadIPC

Fields

· sendBuf

Summary  |  Top

   public byte[] sendBuf

   public int sendBufStart

   public int sendBufEnd

   public byte[] recvBuf

   public int recvBufStart

   public int recvBufEnd

   public Reference[] sendRefTab

   public int sendRefTabStart

   public int sendRefTabEnd

   public Reference[] recvRefTab

   public int recvRefTabStart

   public int recvRefTabEnd

   public Object[] sendObjTab

   public int sendObjTabStart

   public int sendObjTabEnd

   public Object[] recvObjTab

   public int recvObjTabStart

   public int recvObjTabEnd

Constructors

· IPCPayload

Summary  |  Top

   public IPCPayload() 

Default constructor

   protected Object clone()  throws CloneNotSupportedException, OutOfMemoryError

Create a deep copy of this IPCPayload.

Returns:

a new IPCPayload object with copies of the entire buffers and buffer state of this payload.

Overrides:

clone in class Object

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