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#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include "Evas_Data.h"
#include "evas_mempool.h"
//#define NOPOOL
typedef struct _Pool Pool;
struct _Pool
{
int usage;
void *base;
Pool *prev, *next;
};
Pool *
_evas_mp_pool_new(Evas_Mempool *pool)
{
#ifdef NOPOOL
static Pool thepool;
return &thepool;
#else
Pool *p;
void **ptr;
int item_alloc, i;
item_alloc =
((pool->item_size + sizeof(void *) - 1) / sizeof(void *)) * sizeof(void *);
p = malloc(sizeof(Pool) + (pool->pool_size * item_alloc));
ptr = (void **)(((unsigned char *)p) + sizeof(Pool));
p->usage = 0;
p->base = ptr;
for (i = 0; i < pool->pool_size - 1; i++)
{
*ptr = (void **)(((unsigned char *)ptr) + item_alloc);
ptr = *ptr;
}
*ptr = NULL;
return p;
#endif
}
void
_evas_mp_pool_free(Pool *p)
{
#if !defined(NOPOOL)
free(p);
#endif
}
void *
evas_mempool_malloc(Evas_Mempool *pool, int size)
{
#ifdef NOPOOL
return malloc(size);
#else
Pool *p;
void *mem;
for (p = pool->first; p; p = p->next) // look 4 pool from 2nd bucket on
{
if (p->base) // base is not NULL - has a free slot
{
if (p->prev)
{
if (pool->last == p)
pool->last = p->prev;
p->prev->next = p->next;
p->prev = NULL;
p->next = pool->first;
p->next->prev = p;
pool->first = p;
}
break;
}
}
if (!p) // we have reached the end of the list - no free pools
{
p = _evas_mp_pool_new(pool);
if (!p)
return NULL;
p->prev = NULL;
p->next = pool->first;
if (p->next)
p->next->prev = p;
if (!pool->last)
pool->last = p;
pool->first = p;
}
mem = p->base; // this points to the next free block - so take it
p->base = *((void **)mem); // base now points to the next free block
if (!p->base) // move to end - it just filled up
if (p->next)
{
if (p->prev)
p->prev->next = p->next;
else
pool->first = p->next;
p->next->prev = p->prev;
((Pool *)pool->last)->next = p;
p->prev = pool->last;
p->next = NULL;
pool->last = p;
}
p->usage++;
pool->usage++;
return mem;
#endif
}
void
evas_mempool_free(Evas_Mempool *pool, void *ptr)
{
#ifdef NOPOOL
free(ptr);
#else
Pool *p;
void *pmem;
int item_alloc, psize;
item_alloc =
((pool->item_size + sizeof(void *) - 1) / sizeof(void *)) * sizeof(void *);
psize = item_alloc * pool->pool_size;
for (p = (Pool *)(pool->first); p; p = p->next) // look 4 pool
{
pmem = (void *)(((unsigned char *)p) + sizeof(Pool)); // pool mem base
if ((ptr >= pmem) &&
((unsigned char *)ptr < (((unsigned char *)pmem) + psize))) // is it in pool mem?
{
*((void **)ptr) = p->base; // freed node points to prev free node
p->base = ptr; // next free node is now the one we freed
p->usage--;
pool->usage--;
if (p->usage == 0) // free bucket
{
if (p->prev)
p->prev->next = p->next;
if (p->next)
p->next->prev = p->prev;
if (pool->last == p)
pool->last = p->prev;
if (pool->first == p)
pool->first = p->next;
_evas_mp_pool_free(p);
}
else if (p->prev) // if not the first - move to front
{
p->prev->next = p->next;
if (p->next)
p->next->prev = p->prev;
if (pool->last == p)
pool->last = p->prev;
p->prev = NULL;
p->next = pool->first;
p->next->prev = p;
pool->first = p;
}
break;
}
}
#endif
}
void *
evas_mempool_calloc(Evas_Mempool *pool, int size)
{
#ifdef NOPOOL
return calloc(1, size);
#else
void *mem;
mem = evas_mempool_malloc(pool, size);
memset(mem, 0, size);
return mem;
#endif
}
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