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sc::ProcFileGrp Class Reference

The ProcFileGrp concrete class provides an implementation of FileGrp for a single processor. More...

#include <fileproc.h>

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List of all members.

Public Methods

 ProcFileGrp ()
 ProcFileGrp (const Ref< KeyVal > &)
 ~ProcFileGrp ()
ProcFileGrp * clone ()
 Clones the given FileGrp. The new FileGrp may need to be initialized additionally.

void set_localsize (size_t)
 Set the size of locally held data. More...

void * localdata ()
void * obtain_readwrite (distsize_t offset, int size)
 Only one thread can have an unreleased obtain_readwrite at a time. More...

void * obtain_readonly (distsize_t offset, int size)
 This gives read access to the file location. No locking is done.

void * obtain_writeonly (distsize_t offset, int size)
 This gives write access to the data location. No locking is done.

void release_readonly (void *data, distsize_t offset, int size)
 This is called when read access is no longer needed.

void release_writeonly (void *data, distsize_t offset, int size)
 This is called when write access is no longer needed.

void release_readwrite (void *data, distsize_t offset, int size)
 This is called when read/write access is no longer needed. More...

void sync ()
 Synchronizes all the nodes. More...


Detailed Description

The ProcFileGrp concrete class provides an implementation of FileGrp for a single processor.


Member Function Documentation

void* sc::ProcFileGrp::obtain_readwrite distsize_t    offset,
int    size
[virtual]
 

Only one thread can have an unreleased obtain_readwrite at a time.

The actual file region locked can be larger than that requested. If the file region is already locked this will block. For this reason, data should be held as read/write for as short a time as possible.

Implements sc::FileGrp.

void sc::ProcFileGrp::release_readwrite void *    data,
distsize_t    offset,
int    size
[virtual]
 

This is called when read/write access is no longer needed.

The data will be unlocked.

Implements sc::FileGrp.

void sc::ProcFileGrp::set_localsize size_t    [virtual]
 

Set the size of locally held data.

When data is accessed using a global offset counting starts at node 0 and proceeds up to node n() - 1.

Implements sc::FileGrp.

void sc::ProcFileGrp::sync   [virtual]
 

Synchronizes all the nodes.

Consider using this when the way you you access data changes.

Implements sc::FileGrp.


The documentation for this class was generated from the following file:
Generated at Wed Apr 28 10:14:22 2004 for MPQC 2.2.2 using the documentation package Doxygen 1.2.14.