mirror of
https://github.com/KolibriOS/kolibrios.git
synced 2024-12-27 00:39:41 +03:00
248 lines
7.1 KiB
C
248 lines
7.1 KiB
C
/*
|
|
* Copyright (c) 2007 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.
|
|
*/
|
|
|
|
#include "object_heap.h"
|
|
|
|
#include "assert.h"
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
|
|
#define ASSERT assert
|
|
|
|
#define LAST_FREE -1
|
|
#define ALLOCATED -2
|
|
|
|
/*
|
|
* Expands the heap
|
|
* Return 0 on success, -1 on error
|
|
*/
|
|
static int object_heap_expand( object_heap_p heap )
|
|
{
|
|
int i;
|
|
void *new_heap_index;
|
|
int next_free;
|
|
int new_heap_size = heap->heap_size + heap->heap_increment;
|
|
int bucket_index = new_heap_size / heap->heap_increment - 1;
|
|
|
|
if (bucket_index >= heap->num_buckets) {
|
|
int new_num_buckets = heap->num_buckets + 8;
|
|
void **new_bucket;
|
|
|
|
new_bucket = realloc(heap->bucket, new_num_buckets * sizeof(void *));
|
|
if (NULL == new_bucket) {
|
|
return -1;
|
|
}
|
|
|
|
heap->num_buckets = new_num_buckets;
|
|
heap->bucket = new_bucket;
|
|
}
|
|
|
|
new_heap_index = (void *) malloc( heap->heap_increment * heap->object_size );
|
|
if ( NULL == new_heap_index )
|
|
{
|
|
return -1; /* Out of memory */
|
|
}
|
|
|
|
heap->bucket[bucket_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) (new_heap_index + (i - heap->heap_size) * heap->object_size);
|
|
obj->id = i + heap->id_offset;
|
|
obj->next_free = next_free;
|
|
next_free = i;
|
|
}
|
|
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->next_free = LAST_FREE;
|
|
_i965InitMutex(&heap->mutex);
|
|
heap->num_buckets = 0;
|
|
heap->bucket = NULL;
|
|
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;
|
|
int bucket_index, obj_index;
|
|
|
|
_i965LockMutex(&heap->mutex);
|
|
if ( LAST_FREE == heap->next_free )
|
|
{
|
|
if( -1 == object_heap_expand( heap ) )
|
|
{
|
|
_i965UnlockMutex(&heap->mutex);
|
|
return -1; /* Out of memory */
|
|
}
|
|
}
|
|
ASSERT( heap->next_free >= 0 );
|
|
|
|
bucket_index = heap->next_free / heap->heap_increment;
|
|
obj_index = heap->next_free % heap->heap_increment;
|
|
|
|
obj = (object_base_p) (heap->bucket[bucket_index] + obj_index * heap->object_size);
|
|
heap->next_free = obj->next_free;
|
|
_i965UnlockMutex(&heap->mutex);
|
|
|
|
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;
|
|
int bucket_index, obj_index;
|
|
|
|
_i965LockMutex(&heap->mutex);
|
|
if ( (id < heap->id_offset) || (id > (heap->heap_size+heap->id_offset)) )
|
|
{
|
|
_i965UnlockMutex(&heap->mutex);
|
|
return NULL;
|
|
}
|
|
id &= OBJECT_HEAP_ID_MASK;
|
|
bucket_index = id / heap->heap_increment;
|
|
obj_index = id % heap->heap_increment;
|
|
obj = (object_base_p) (heap->bucket[bucket_index] + obj_index * heap->object_size);
|
|
_i965UnlockMutex(&heap->mutex);
|
|
|
|
/* 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;
|
|
int bucket_index, obj_index;
|
|
|
|
_i965LockMutex(&heap->mutex);
|
|
while ( i < heap->heap_size)
|
|
{
|
|
bucket_index = i / heap->heap_increment;
|
|
obj_index = i % heap->heap_increment;
|
|
|
|
obj = (object_base_p) (heap->bucket[bucket_index] + obj_index * heap->object_size);
|
|
if (obj->next_free == ALLOCATED)
|
|
{
|
|
_i965UnlockMutex(&heap->mutex);
|
|
*iter = i;
|
|
return obj;
|
|
}
|
|
i++;
|
|
}
|
|
_i965UnlockMutex(&heap->mutex);
|
|
*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 );
|
|
|
|
_i965LockMutex(&heap->mutex);
|
|
obj->next_free = heap->next_free;
|
|
heap->next_free = obj->id & OBJECT_HEAP_ID_MASK;
|
|
_i965UnlockMutex(&heap->mutex);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Destroys a heap, the heap must be empty.
|
|
*/
|
|
void object_heap_destroy( object_heap_p heap )
|
|
{
|
|
object_base_p obj;
|
|
int i;
|
|
int bucket_index, obj_index;
|
|
|
|
_i965DestroyMutex(&heap->mutex);
|
|
|
|
/* Check if heap is empty */
|
|
for (i = 0; i < heap->heap_size; i++)
|
|
{
|
|
/* Check if object is not still allocated */
|
|
bucket_index = i / heap->heap_increment;
|
|
obj_index = i % heap->heap_increment;
|
|
obj = (object_base_p) (heap->bucket[bucket_index] + obj_index * heap->object_size);
|
|
ASSERT( obj->next_free != ALLOCATED );
|
|
}
|
|
|
|
for (i = 0; i < heap->heap_size / heap->heap_increment; i++) {
|
|
free(heap->bucket[i]);
|
|
}
|
|
|
|
free(heap->bucket);
|
|
heap->bucket = NULL;
|
|
heap->heap_size = 0;
|
|
heap->next_free = LAST_FREE;
|
|
}
|