forked from KolibriOS/kolibrios
248 lines
7.1 KiB
C
248 lines
7.1 KiB
C
/*
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* Copyright (c) 2007 Intel Corporation. All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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* IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "object_heap.h"
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#include "assert.h"
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#define ASSERT assert
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#define LAST_FREE -1
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#define ALLOCATED -2
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/*
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* Expands the heap
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* Return 0 on success, -1 on error
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*/
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static int object_heap_expand( object_heap_p heap )
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{
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int i;
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void *new_heap_index;
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int next_free;
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int new_heap_size = heap->heap_size + heap->heap_increment;
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int bucket_index = new_heap_size / heap->heap_increment - 1;
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if (bucket_index >= heap->num_buckets) {
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int new_num_buckets = heap->num_buckets + 8;
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void **new_bucket;
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new_bucket = realloc(heap->bucket, new_num_buckets * sizeof(void *));
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if (NULL == new_bucket) {
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return -1;
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}
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heap->num_buckets = new_num_buckets;
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heap->bucket = new_bucket;
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}
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new_heap_index = (void *) malloc( heap->heap_increment * heap->object_size );
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if ( NULL == new_heap_index )
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{
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return -1; /* Out of memory */
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}
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heap->bucket[bucket_index] = new_heap_index;
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next_free = heap->next_free;
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for(i = new_heap_size; i-- > heap->heap_size; )
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{
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object_base_p obj = (object_base_p) (new_heap_index + (i - heap->heap_size) * heap->object_size);
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obj->id = i + heap->id_offset;
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obj->next_free = next_free;
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next_free = i;
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}
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heap->next_free = next_free;
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heap->heap_size = new_heap_size;
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return 0; /* Success */
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}
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/*
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* Return 0 on success, -1 on error
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*/
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int object_heap_init( object_heap_p heap, int object_size, int id_offset)
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{
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heap->object_size = object_size;
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heap->id_offset = id_offset & OBJECT_HEAP_OFFSET_MASK;
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heap->heap_size = 0;
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heap->heap_increment = 16;
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heap->next_free = LAST_FREE;
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_i965InitMutex(&heap->mutex);
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heap->num_buckets = 0;
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heap->bucket = NULL;
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return object_heap_expand(heap);
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}
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/*
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* Allocates an object
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* Returns the object ID on success, returns -1 on error
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*/
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int object_heap_allocate( object_heap_p heap )
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{
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object_base_p obj;
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int bucket_index, obj_index;
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_i965LockMutex(&heap->mutex);
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if ( LAST_FREE == heap->next_free )
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{
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if( -1 == object_heap_expand( heap ) )
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{
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_i965UnlockMutex(&heap->mutex);
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return -1; /* Out of memory */
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}
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}
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ASSERT( heap->next_free >= 0 );
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bucket_index = heap->next_free / heap->heap_increment;
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obj_index = heap->next_free % heap->heap_increment;
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obj = (object_base_p) (heap->bucket[bucket_index] + obj_index * heap->object_size);
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heap->next_free = obj->next_free;
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_i965UnlockMutex(&heap->mutex);
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obj->next_free = ALLOCATED;
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return obj->id;
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}
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/*
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* Lookup an object by object ID
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* Returns a pointer to the object on success, returns NULL on error
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*/
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object_base_p object_heap_lookup( object_heap_p heap, int id )
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{
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object_base_p obj;
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int bucket_index, obj_index;
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_i965LockMutex(&heap->mutex);
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if ( (id < heap->id_offset) || (id > (heap->heap_size+heap->id_offset)) )
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{
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_i965UnlockMutex(&heap->mutex);
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return NULL;
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}
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id &= OBJECT_HEAP_ID_MASK;
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bucket_index = id / heap->heap_increment;
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obj_index = id % heap->heap_increment;
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obj = (object_base_p) (heap->bucket[bucket_index] + obj_index * heap->object_size);
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_i965UnlockMutex(&heap->mutex);
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/* Check if the object has in fact been allocated */
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if ( obj->next_free != ALLOCATED )
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{
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return NULL;
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}
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return obj;
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}
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/*
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* Iterate over all objects in the heap.
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* Returns a pointer to the first object on the heap, returns NULL if heap is empty.
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*/
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object_base_p object_heap_first( object_heap_p heap, object_heap_iterator *iter )
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{
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*iter = -1;
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return object_heap_next( heap, iter );
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}
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/*
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* Iterate over all objects in the heap.
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* Returns a pointer to the next object on the heap, returns NULL if heap is empty.
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*/
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object_base_p object_heap_next( object_heap_p heap, object_heap_iterator *iter )
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{
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object_base_p obj;
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int i = *iter + 1;
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int bucket_index, obj_index;
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_i965LockMutex(&heap->mutex);
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while ( i < heap->heap_size)
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{
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bucket_index = i / heap->heap_increment;
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obj_index = i % heap->heap_increment;
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obj = (object_base_p) (heap->bucket[bucket_index] + obj_index * heap->object_size);
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if (obj->next_free == ALLOCATED)
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{
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_i965UnlockMutex(&heap->mutex);
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*iter = i;
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return obj;
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}
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i++;
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}
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_i965UnlockMutex(&heap->mutex);
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*iter = i;
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return NULL;
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}
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/*
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* Frees an object
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*/
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void object_heap_free( object_heap_p heap, object_base_p obj )
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{
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/* Don't complain about NULL pointers */
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if (NULL != obj)
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{
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/* Check if the object has in fact been allocated */
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ASSERT( obj->next_free == ALLOCATED );
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_i965LockMutex(&heap->mutex);
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obj->next_free = heap->next_free;
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heap->next_free = obj->id & OBJECT_HEAP_ID_MASK;
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_i965UnlockMutex(&heap->mutex);
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}
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}
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/*
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* Destroys a heap, the heap must be empty.
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*/
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void object_heap_destroy( object_heap_p heap )
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{
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object_base_p obj;
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int i;
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int bucket_index, obj_index;
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_i965DestroyMutex(&heap->mutex);
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/* Check if heap is empty */
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for (i = 0; i < heap->heap_size; i++)
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{
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/* Check if object is not still allocated */
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bucket_index = i / heap->heap_increment;
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obj_index = i % heap->heap_increment;
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obj = (object_base_p) (heap->bucket[bucket_index] + obj_index * heap->object_size);
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ASSERT( obj->next_free != ALLOCATED );
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}
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for (i = 0; i < heap->heap_size / heap->heap_increment; i++) {
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free(heap->bucket[i]);
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}
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free(heap->bucket);
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heap->bucket = NULL;
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heap->heap_size = 0;
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heap->next_free = LAST_FREE;
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}
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