cctalk-svr-mem.h File Reference

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Detailed Description

memory allocation manager for the cctalk server

Author:

Rod Boyce

Date:

18/10/04

This memory allocation manager will obtain blocks of memory from the system and return packets to the server. The blocks will be bigger than required by the server. The server will only request memory from the system as needed and pass out smaller blocks to the server as needed.

The whole point is that a system block is 4K but the only operation that needs memory is a cctalk operation these are queued here in the server. A cctalk operation is 536-bytes so seven of these at a time are requested from the system. This will hopefully reduce memory fragmentation of available free memory to Linux.

NOTE from man page on malloc & free: In case Linux is employed under circumstances where it would be less desirable to suddenly lose some randomly picked processes, and moreover the kernel version is sufficiently recent, one can switch off this over-committing behavior using a command like: # echo 2 > /proc/sys/vm/overcommit_memory

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Functions
void	cctm_Initialise (void)
	Initialise the cctalk memory manager.
void	cctm_Shutdown (void)
	close down the memory manager.
tsCCTALK_OPERATION *	cctm_MallocOp (void)
	Get a packet from the free list and return it.
void	cctm_FreeOp (tsCCTALK_OPERATION *pCctOp)
	Free a cctalk operation.

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Function Documentation

void cctm_FreeOp (  tsCCTALK_OPERATION *  pCctOp  )

Free a cctalk operation. Return a cctalk operation to the free list call when finished with a cctalk operation. Date: 26/10/04 Author: Rod Boyce Parameters: pCctOp  - pointer to the cctalk operation structure to free. History

void cctm_Initialise (  void   )

Initialise the cctalk memory manager. Set up the memory manager this is going to be a block manager it is not overly complicated but there are a few complications Date: 26/10/04 Author: Rod Boyce Parameters: \return  History

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tsCCTALK_OPERATION* cctm_MallocOp (  void   )

Get a packet from the free list and return it. Called by the server to allocate a cctalk operation that can be used to store an cctalk operation. A cctalk structure is taken from the free list and returned to the calling process. Date: 26/10/04 Author: Rod Boyce Returns: pointer to a cctalk structure History

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void cctm_Shutdown (  void   )

close down the memory manager. Date: 26/10/04 Author: Rod Boyce Called when closing down the system. All memory that is being used by the system is freed. History

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