LSMP_global Struct Reference
[Shared memory buffering]

Shared memory global data. More...

#include <lsmp_int.hh>

List of all members.

Public Attributes
int	status
int	version
	LSMP version number.
int	gbl_count
	Number of times partition was accessed.
int	gbl_semid
	Global semaphore ID.
int	nbuf
	Number of buffer in partition.
int	lbuf
	Buffer data length.
LSMP_BufferQ	full
	Full buffer list.
LSMP_BufferQ	free
	Free buffer list.
char	name [LSMP_LNAME]
	Partition name.
int	ncons
	Number of active consumers.
int	con_semid [LSMP_LMASK]
	Consumer semaphore IDs.
ConFlags	conmask
	Consumer use masks.

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Detailed Description

Shared memory global data.

The shared memory global class contains the constrol and status held in the shared memory partition.

Author:

John Zweizig

Version:

1.2; Last modified March 4, 2008

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Member Data Documentation

int LSMP_global::status

The status flags control the buffer allocation policy. The default policy is to allocate buffers from the free list only and to release a buffer only when it is not reserved, is not in use and has been seen by at least one consumer. The policy modification bits are as follows:

RELBUF	A buffer is released if no consumers have reserved it, even if it has not been seen.
SCAVAGE	The oldest unused and unreserved buffer may be allocated from the full queue. Unused buffers are not returned to the free queue.
RQSYNCH	No buffer may be allocated by a producer unless there is a consumer waiting.
KEEP	Don't delete the partition when the global access count goes to zero.
EXPOSE	All buffers will be automatically reserved by all current consumers.

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

• lsmp/lsmp_int.hh

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