Class DoubleItemBuf
- Version:
- 25-Oct-2007
- Author:
- Alan Kaminsky
-
Field Summary
-
Constructor Summary
ConstructorDescriptionConstruct a new double item buffer.DoubleItemBuf
(double item) Construct a new double item buffer with the given initial value. -
Method Summary
Modifier and TypeMethodDescriptiondouble
get
(int i) Obtain the given item from this buffer.getReductionBuf
(Op op) Create a buffer for performing parallel reduction using the given binary operation.void
put
(int i, double item) Store the given item in this buffer.protected int
receiveItems
(int i, int num, ByteBuffer buffer) Receive as many items as possible from the given byte buffer to this buffer.protected int
sendItems
(int i, ByteBuffer buffer) Send as many items as possible from this buffer to the given byte buffer.Methods inherited from class edu.rit.mp.DoubleBuf
buffer, buffer, buffer, buffer, buffer, buffer, colSliceBuffer, colSliceBuffers, copy, defaultCopy, emptyBuffer, fill, getTemporaryBuf, patchBuffer, patchBuffers, rowSliceBuffer, rowSliceBuffers, sliceBuffer, sliceBuffer, sliceBuffers, sliceBuffers
-
Field Details
-
item
public double itemDouble item to be sent or received.
-
-
Constructor Details
-
DoubleItemBuf
public DoubleItemBuf()Construct a new double item buffer. -
DoubleItemBuf
public DoubleItemBuf(double item) Construct a new double item buffer with the given initial value.- Parameters:
item
- Initial value of theitem
field.
-
-
Method Details
-
get
public double get(int i) Obtain the given item from this buffer.The
get()
method must not block the calling thread; if it does, all message I/O in MP will be blocked. Obtain the given item from this buffer.The
get()
method must not block the calling thread; if it does, all message I/O in MP will be blocked. -
put
public void put(int i, double item) Store the given item in this buffer.The
put()
method must not block the calling thread; if it does, all message I/O in MP will be blocked. Store the given item in this buffer.The
put()
method must not block the calling thread; if it does, all message I/O in MP will be blocked. -
getReductionBuf
Create a buffer for performing parallel reduction using the given binary operation. The results of the reduction are placed into this buffer.Operations performed on the returned reduction buffer have the same effect as operations performed on this buffer, except whenever a source item S is put into a destination item D in this buffer, D is set to D op S, that is, the reduction of D and S using the given binary operation (rather than just setting D to S). Create a buffer for performing parallel reduction using the given binary operation. The results of the reduction are placed into this buffer.
- Specified by:
getReductionBuf
in classBuf
- Parameters:
op
- Binary operation.- Returns:
- a
Buf
object. - Throws:
ClassCastException
- (unchecked exception) Thrown if this buffer's element data type and the given binary operation's argument data type are not the same.
-
sendItems
Send as many items as possible from this buffer to the given byte buffer.The
sendItems()
method must not block the calling thread; if it does, all message I/O in MP will be blocked. Send as many items as possible from this buffer to the given byte buffer.The
sendItems()
method must not block the calling thread; if it does, all message I/O in MP will be blocked. -
receiveItems
Receive as many items as possible from the given byte buffer to this buffer.The
receiveItems()
method must not block the calling thread; if it does, all message I/O in MP will be blocked. Receive as many items as possible from the given byte buffer to this buffer.The
receiveItems()
method must not block the calling thread; if it does, all message I/O in MP will be blocked.- Specified by:
receiveItems
in classBuf
- Parameters:
i
- Index of first item to receive, in the range 0 ..length
-1.num
- Maximum number of items to receive.buffer
- Byte buffer.- Returns:
- Number of items received.
-