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/*******************************************************************************
* Copyright (c) 2012 protos software gmbh (http://www.protos.de).
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* CONTRIBUTORS:
* Henrik Rentz-Reichert (initial contribution)
*
*******************************************************************************/
#include "base/etMemory_FreeList.h"
#include "debugging/etLogger.h"
#include "debugging/etMSCLogger.h"
#define UNUSED_LIST 0
#define DEBUG_FREE_LISTS 1
typedef struct etFreeListObj {
struct etFreeListObj* next;
} etFreeListObj;
typedef struct etFreeListInfo {
/** the size in bytes of the objects in this list */
etUInt16 objsize;
/** the list head */
etFreeListObj* head;
#if DEBUG_FREE_LISTS
etUInt16 nobjects;
#endif
} etFreeListInfo;
typedef struct etFreeListMemory {
etMemory base;
/** next free position on the heap */
etUInt8* current;
/** number of free lists */
etUInt16 nslots;
/** array of free list infos (array used with size nslots) */
etFreeListInfo freelists[1];
} etFreeListMemory;
/*
* private functions
*/
static void* etMemory_getHeapMem(etFreeListMemory* self, etUInt16 size) {
etUInt8* obj = NULL;
ET_MSC_LOGGER_SYNC_ENTRY("etMemory", "getHeapListMem")
if (self->current < ((etUInt8*)self)+self->base.size)
{
obj = self->current;
self->current += size;
}
ET_MSC_LOGGER_SYNC_EXIT
return obj;
}
static void* etMemory_getFreeListMem(etFreeListMemory* self, etUInt16 size) {
etUInt8* mem = NULL;
int asize, slot_offset, slot, slot_size;
ET_MSC_LOGGER_SYNC_ENTRY("etMemory", "getFreeListMem")
asize = (size / ALIGNMENT);
for (slot_offset = 0; slot_offset < self->nslots; slot_offset++) {
slot = (asize + slot_offset) % self->nslots;
slot_size = self->freelists[slot].objsize;
if (slot_size == size) {
if (self->freelists[slot].head != NULL) {
etFreeListObj* obj = self->freelists[slot].head;
self->freelists[slot].head = obj->next;
mem = (void *) obj;
#if DEBUG_FREE_LISTS
--self->freelists[slot].nobjects;
#endif
}
break;
}
else if (slot_size == UNUSED_LIST)
break;
}
ET_MSC_LOGGER_SYNC_EXIT
return mem;
}
static void etMemory_putFreeListMem(etFreeListMemory* self, void* obj, etUInt16 size) {
ET_MSC_LOGGER_SYNC_ENTRY("etMemory", "putFreeListMem")
{
int asize, slot_offset, slot, slot_size;
asize = (size / ALIGNMENT);
for (slot_offset = 0; slot_offset < self->nslots; slot_offset++) {
slot = (asize + slot_offset) % self->nslots;
slot_size = self->freelists[slot].objsize;
if (slot_size == size) {
/* we insert the object as new head */
((etFreeListObj*)obj)->next = self->freelists[slot].head;
self->freelists[slot].head = (etFreeListObj*)obj;
#if DEBUG_FREE_LISTS
++self->freelists[slot].nobjects;
#endif
break;
}
else if (slot_size == UNUSED_LIST) {
/* initialize unused list and insert the object as new head */
self->freelists[slot].objsize = size;
((etFreeListObj*)obj)->next = NULL;
self->freelists[slot].head = (etFreeListObj*)obj;
#if DEBUG_FREE_LISTS
self->freelists[slot].nobjects = 1;
#endif
break;
}
}
}
ET_MSC_LOGGER_SYNC_EXIT
}
void* etMemory_FreeList_alloc(etMemory* heap, etUInt16 size) {
void* mem;
size = CEIL_ALIGN(size);
ET_MSC_LOGGER_SYNC_ENTRY("etMemory", "alloc")
mem = etMemory_getFreeListMem((etFreeListMemory*) heap, size);
if (mem==NULL)
mem = etMemory_getHeapMem((etFreeListMemory*) heap, size);
ET_MSC_LOGGER_SYNC_EXIT
return mem;
}
void etMemory_FreeList_free(etMemory* heap, void* obj, etUInt16 size) {
ET_MSC_LOGGER_SYNC_ENTRY("etMemory", "free")
{
size = CEIL_ALIGN(size);
etMemory_putFreeListMem((etFreeListMemory*) heap, obj, size);
}
ET_MSC_LOGGER_SYNC_EXIT
}
/*
* the public interface
*/
etMemory* etMemory_FreeList_init(void* heap, etUInt32 size, etUInt16 nslots) {
etFreeListMemory* self = (etFreeListMemory*) heap;
ET_MSC_LOGGER_SYNC_ENTRY("etMemory_FreeList_init", "init")
self->base.size = size;
self->base.alloc = etMemory_FreeList_alloc;
self->base.free = etMemory_FreeList_free;
self->nslots = nslots;
{
int used = sizeof(etFreeListMemory)+(self->nslots-1)*sizeof(etFreeListObj);
self->current = ((etUInt8*)self)+CEIL_ALIGN(used);
}
/* initialize the free lists */
{
int i;
for (i=0; i<self->nslots; ++i)
self->freelists[i].objsize = UNUSED_LIST;
}
ET_MSC_LOGGER_SYNC_EXIT
return &self->base;
}
etUInt32 etMemory_FreeList_freeHeapMem(void* heap) {
etFreeListMemory* self = (etFreeListMemory*) heap;
return ((etUInt8*)self)+self->base.size - self->current;
}
etUInt16 etMemory_FreeList_freeSlots(void* heap) {
etFreeListMemory* self = (etFreeListMemory*) heap;
etUInt16 free = 0;
int slot;
for (slot=0; slot<self->nslots; ++slot)
if (self->freelists[slot].objsize==UNUSED_LIST)
++free;
return free;
}
etUInt16 etMemory_FreeList_nObjects(void* heap, etUInt16 slot) {
#if DEBUG_FREE_LISTS
etFreeListMemory* self = (etFreeListMemory*) heap;
if (slot<self->nslots)
return self->freelists[slot].nobjects;
#endif
return 0;
}
etUInt16 etMemory_FreeList_sizeObjects(void* heap, etUInt16 slot) {
etFreeListMemory* self = (etFreeListMemory*) heap;
if (slot<self->nslots)
return self->freelists[slot].objsize;
return 0;
}
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