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/* $Id$ */
#include "stdafx.h"
#include "openttd.h"
#include "debug.h"
#include "functions.h"
#include "pool.h"
/**
* Clean a pool in a safe way (does free all blocks)
*/
void CleanPool(MemoryPool *pool)
{
uint i;
DEBUG(misc, 4)("[Pool] (%s) Cleaning pool..", pool->name);
/* Free all blocks */
for (i = 0; i < pool->current_blocks; i++) {
if (pool->clean_block_proc != NULL) {
pool->clean_block_proc(i * (1 << pool->block_size_bits), (i + 1) * (1 << pool->block_size_bits) - 1);
}
free(pool->blocks[i]);
}
/* Free the block itself */
free(pool->blocks);
/* Clear up some critical data */
pool->total_items = 0;
pool->current_blocks = 0;
pool->blocks = NULL;
}
/**
* This function tries to increase the size of array by adding
* 1 block too it
*
* @return Returns false if the pool could not be increased
*/
bool AddBlockToPool(MemoryPool *pool)
{
/* Is the pool at his max? */
if (pool->max_blocks == pool->current_blocks)
return false;
pool->total_items = (pool->current_blocks + 1) * (1 << pool->block_size_bits);
DEBUG(misc, 4)("[Pool] (%s) Increasing size of pool to %d items (%d bytes)", pool->name, pool->total_items, pool->total_items * pool->item_size);
/* Increase the poolsize */
pool->blocks = realloc(pool->blocks, sizeof(pool->blocks[0]) * (pool->current_blocks + 1));
if (pool->blocks == NULL)
error("Pool: (%s) could not allocate memory for blocks", pool->name);
/* Allocate memory to the new block item */
pool->blocks[pool->current_blocks] = malloc(pool->item_size * (1 << pool->block_size_bits));
if (pool->blocks[pool->current_blocks] == NULL)
error("Pool: (%s) could not allocate memory for blocks", pool->name);
/* Clean the content of the new block */
memset(pool->blocks[pool->current_blocks], 0, pool->item_size * (1 << pool->block_size_bits));
/* Call a custom function if defined (e.g. to fill indexes) */
if (pool->new_block_proc != NULL)
pool->new_block_proc(pool->current_blocks * (1 << pool->block_size_bits));
/* We have a new block */
pool->current_blocks++;
return true;
}
/**
* Adds blocks to the pool if needed (and possible) till index fits inside the pool
*
* @return Returns false if adding failed
*/
bool AddBlockIfNeeded(MemoryPool *pool, uint index)
{
while (index >= pool->total_items) {
if (!AddBlockToPool(pool))
return false;
}
return true;
}
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