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Man Pages


Manual Reference Pages  -  SC_ACTIVEMSGMEMORYGRP (3)

NAME

sc::ActiveMsgMemoryGrp - The ActiveMsgMemoryGrp abstract class specializes the MsgMemoryGrp class.

CONTENTS

Synopsis

SYNOPSIS

#include <memamsg.h>

Inherits sc::MsgMemoryGrp.

Inherited by sc::MTMPIMemoryGrp.

    Public Member Functions

    ActiveMsgMemoryGrp (const Ref< MessageGrp > &msg)    
ActiveMsgMemoryGrp (const Ref< KeyVal > &)    
void set_localsize (size_t)
Set the size of locally held memory.     void * localdata ()
Returns a pointer to the local data.     void * obtain_writeonly (distsize_t offset, int size)
This gives write access to the memory location. No locking is done.     void * obtain_readwrite (distsize_t offset, int size)
Only one thread can have an unreleased obtain_readwrite at a time.     void * obtain_readonly (distsize_t offset, int size)
This gives read access to the memory 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.     void sum_reduction (double *data, distsize_t doffset, int dsize)    
void sum_reduction_on_node (double *data, size_t doffset, int dsize, int node=-1)    
void print (std::ostream &o=ExEnv::out0()) const
Prints out information about the object.

    Protected Member Functions

    virtual void retrieve_data (void *, int node, int offset, int size, int lock)=0    
virtual void replace_data (void *, int node, int offset, int size, int unlock)=0    
virtual void sum_data (double *data, int node, int doffset, int dsize)=0

    Protected Attributes

    char * data_

    Additional Inherited Members

Detailed Description

The ActiveMsgMemoryGrp abstract class specializes the MsgMemoryGrp class.

It uses active messages to implement global shared memory.

Member Function Documentation

void* sc::ActiveMsgMemoryGrp::obtain_readwrite (distsize_t offset, int size) [virtual]

Only one thread can have an unreleased obtain_readwrite at a time. The actual memory region locked can be larger than that requested. If the memory 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::MemoryGrp.

void sc::ActiveMsgMemoryGrp::release_readwrite (void * data, distsize_t offset, int size) [virtual]

This is called when read/write access is no longer needed. The memory will be unlocked.

Implements sc::MemoryGrp.

void sc::ActiveMsgMemoryGrp::set_localsize (size_t) [virtual]

Set the size of locally held memory. When memory is accessed using a global offset counting starts at node 0 and proceeds up to node n() - 1.

Implements sc::MemoryGrp.

Author

Generated automatically by Doxygen for MPQC from the source code.

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Version 2.3.1 SC::ACTIVEMSGMEMORYGRP (3) Sun Apr 3 2016

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