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sc::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 sc::ShmMessageGrp:

[legend]Collaboration diagram for sc::ShmMessageGrp:

[legend]List of all members.

Public Methods
	ShmMessageGrp ()
	Reads the number of processors from environmental variable NUMPROC.
	ShmMessageGrp (const Ref< KeyVal > &)
	The ShmMessageGrp KeyVal constructor takes a single keyword that specifies the number of processors. More...
	ShmMessageGrp (int nprocs)
	Initialize ShmMessageGrp to use nprocs processors.
	~ShmMessageGrp ()
void	sync ()
	Synchronize all of the processors.
Ref< MessageGrp >	clone (void)
	Returns a copy of this MessageGrp specialization that provides an independent communication context.
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 ()
msgbuf_t *	NEXT_MESSAGE (msgbuf_t *m)
void	get_change (int node)
void	put_change (int node)
void	wait_for_write (int node)
void	release_write (int node)
void	print_buffer (int node, int me)
Protected Attributes
commbuf_t *	commbuf [MAXPROCS]
int	shmid
int	semid
int	change_semid
void *	sharedmem
sembuf	semdec
sembuf	seminc

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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.

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Constructor & Destructor Documentation

sc::ShmMessageGrp::ShmMessageGrp (  const Ref< KeyVal > &    )

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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