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ShmMessageGrp Class Reference

The ShmMessageGrp class is an implementation of MessageGrp that allows multiple process to be started that communicate with shared memory. More...

#include <messshm.h>

Inheritance diagram for ShmMessageGrp

[legend]Collaboration diagram for ShmMessageGrp:

[legend]List of all members.

Public Methods
	ShmMessageGrp ()
	ShmMessageGrp (const Ref< KeyVal > &)
	ShmMessageGrp (int nprocs)
	~ShmMessageGrp ()
void	sync ()
	Synchronize all of the processors.
int	last_source ()
	Returns information about the last message received or probed.
int	last_size ()
int	last_type ()
Protected Methods
void	basic_send (int target, int type, void *data, int nbyte)
	Must be implemented by specializations.
void	basic_recv (int type, void *data, int nbyte)
	Must be implemented by specializations.
int	basic_probe (int type)
	Must be implemented by specializations.
void	initialize (int nprocs)
void	initialize ()
void	set_last_type (int a)
void	set_last_source (int a)
void	set_last_size (int a)
Protected Attributes
int	last_type_
int	last_source_
int	last_size_

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Detailed Description

The ShmMessageGrp class is an implementation of MessageGrp that allows multiple process to be started that communicate with shared memory.

This only provides improved performance if you have multiple CPU's in a symmetric multiprocessor configuration. Nonetheless, it is quite useful on a single CPU for tracking down bugs.

The ShmMessageGrp KeyVal constructor takes a single keyword that specifies the number of processors. Here is an example of a ParsedKeyVal input that creates a ShmMessageGrp that runs on four processors:

message<ShmMessageGrp>: n = 4

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The documentation for this class was generated from the following file:

• messshm.h

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