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/*
* Copyright (c) 2011 Intel Corporation. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* Authors:
* Waldo Bastian <waldo.bastian@intel.com>
*
*/
#include "object_heap.h"
#include <stdlib.h>
#include <string.h>
#include "psb_def.h"
#define LAST_FREE -1
#define ALLOCATED -2
#define SUSPENDED -3
/*
* Expands the heap
* Return 0 on success, -1 on error
*/
static int object_heap_expand(object_heap_p heap)
{
int i;
int malloc_error = FALSE;
object_base_p *new_heap_index;
int next_free;
int new_heap_size = heap->heap_size + heap->heap_increment;
new_heap_index = (object_base_p *) realloc(heap->heap_index, new_heap_size * sizeof(object_base_p));
if (NULL == new_heap_index) {
return -1; /* Out of memory */
}
heap->heap_index = new_heap_index;
next_free = heap->next_free;
for (i = new_heap_size; i-- > heap->heap_size;) {
object_base_p obj = (object_base_p) calloc(1, heap->object_size);
heap->heap_index[i] = obj;
if (NULL == obj) {
malloc_error = TRUE;
continue; /* Clean up after the loop is completely done */
}
obj->id = i + heap->id_offset;
obj->next_free = next_free;
next_free = i;
}
if (malloc_error) {
/* Clean up the mess */
for (i = new_heap_size; i-- > heap->heap_size;) {
if (heap->heap_index[i]) {
free(heap->heap_index[i]);
}
}
/* heap->heap_index is left as is */
return -1; /* Out of memory */
}
heap->next_free = next_free;
heap->heap_size = new_heap_size;
return 0; /* Success */
}
/*
* Return 0 on success, -1 on error
*/
int object_heap_init(object_heap_p heap, int object_size, int id_offset)
{
heap->object_size = object_size;
heap->id_offset = id_offset & OBJECT_HEAP_OFFSET_MASK;
heap->heap_size = 0;
heap->heap_increment = 16;
heap->heap_index = NULL;
heap->next_free = LAST_FREE;
return object_heap_expand(heap);
}
/*
* Allocates an object
* Returns the object ID on success, returns -1 on error
*/
int object_heap_allocate(object_heap_p heap)
{
object_base_p obj;
if (LAST_FREE == heap->next_free) {
if (-1 == object_heap_expand(heap)) {
return -1; /* Out of memory */
}
}
ASSERT(heap->next_free >= 0);
obj = heap->heap_index[heap->next_free];
heap->next_free = obj->next_free;
obj->next_free = ALLOCATED;
return obj->id;
}
/*
* Lookup an object by object ID
* Returns a pointer to the object on success, returns NULL on error
*/
object_base_p object_heap_lookup(object_heap_p heap, int id)
{
object_base_p obj;
if ((id < heap->id_offset) || (id > (heap->heap_size + heap->id_offset))) {
return NULL;
}
id &= OBJECT_HEAP_ID_MASK;
obj = heap->heap_index[id];
/* Check if the object has in fact been allocated */
if (obj->next_free != ALLOCATED) {
return NULL;
}
return obj;
}
/*
* Iterate over all objects in the heap.
* Returns a pointer to the first object on the heap, returns NULL if heap is empty.
*/
object_base_p object_heap_first(object_heap_p heap, object_heap_iterator *iter)
{
*iter = -1;
return object_heap_next(heap, iter);
}
/*
* Iterate over all objects in the heap.
* Returns a pointer to the next object on the heap, returns NULL if heap is empty.
*/
object_base_p object_heap_next(object_heap_p heap, object_heap_iterator *iter)
{
object_base_p obj;
int i = *iter + 1;
while (i < heap->heap_size) {
obj = heap->heap_index[i];
if ((obj->next_free == ALLOCATED) || (obj->next_free == SUSPENDED)) {
*iter = i;
return obj;
}
i++;
}
*iter = i;
return NULL;
}
/*
* Frees an object
*/
void object_heap_free(object_heap_p heap, object_base_p obj)
{
/* Don't complain about NULL pointers */
if (NULL != obj) {
/* Check if the object has in fact been allocated */
ASSERT((obj->next_free == ALLOCATED) || (obj->next_free == SUSPENDED));
obj->next_free = heap->next_free;
heap->next_free = obj->id & OBJECT_HEAP_ID_MASK;
}
}
/*
* Destroys a heap, the heap must be empty.
*/
void object_heap_destroy(object_heap_p heap)
{
object_base_p obj;
int i;
for (i = 0; i < heap->heap_size; i++) {
/* Check if object is not still allocated */
obj = heap->heap_index[i];
ASSERT(obj->next_free != ALLOCATED);
ASSERT(obj->next_free != SUSPENDED);
/* Free object itself */
free(obj);
}
free(heap->heap_index);
heap->heap_size = 0;
heap->heap_index = NULL;
heap->next_free = LAST_FREE;
}
/*
* Suspend an object
* Suspended objects can not be looked up
*/
void object_heap_suspend_object(object_base_p obj, int suspend)
{
if (suspend) {
ASSERT(obj->next_free == ALLOCATED);
obj->next_free = SUSPENDED;
} else {
ASSERT(obj->next_free == SUSPENDED);
obj->next_free = ALLOCATED;
}
}
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