klish/lub/blockpool/blockpool_free.c

/*********************** -*- Mode: C -*- ***********************
 * File            : blockpool_free.c
 *---------------------------------------------------------------
 * Description
 * ===========
 * This operation de-allocates a "block" of memory back into a "blockpool"
 *
 * blockpool - the "blockpool" instance to invoke this operation upon
 *
 * PRE-CONDITIONS
 * The specified block must have been previously allocated using
 * lub_blockpool_alloc.
 * 
 * POST-CONDITIONS
 * The de-allocated block become available for subsequent
 * lub_blockpool_alloc() requests.
 *---------------------------------------------------------------
 * Author          : Graeme McKerrell
 * Created On      : Thu Jan 29 14:08:41 2004
 * Status          : TESTED
 *---------------------------------------------------------------
 * HISTORY
 * 7-Dec-2004		Graeme McKerrell	
 *    updated to use the "lub_" namespace
 * 5-May-2004		Graeme McKerrell	
 *    updates following review
 * 1-Apr-2004		Peter Kennedy	
 *    updated to free the tail as well as the head
 * 6-Feb-2004		Graeme McKerrell	
 *    updated to use FIFO allocation of blocks
 * 29-Jan-2004		Graeme McKerrell	
 *   Initial version
 *---------------------------------------------------------------
 * Copyright (C) 2004 3Com Corporation. All Rights Reserved.
 **************************************************************** */
#include "private.h"

/*--------------------------------------------------------- */
void lub_blockpool_free(lub_blockpool_t * this, void *block)
{
	lub_blockpool_block_t *newfree = block;

	/* simply add this block to the end of the free list */
	newfree->next = NULL;
	if (NULL != this->m_tail) {
		this->m_tail->next = newfree;
	} else {
		/* first entry in the list */
		this->m_head = newfree;
	}
	/* add to end of list */
	this->m_tail = newfree;

	/* updated the stats */
	--this->m_alloc_blocks;
}

/*--------------------------------------------------------- */