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@ -1,12 +1,12 @@ |
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/********************************************************************************************** |
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* |
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* rmem - raylib memory pool and objects pool |
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* rmem n">v1.3 - raylib memory pool and objects pool |
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* |
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* A quick, efficient, and minimal free list and arena-based allocator |
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* |
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* PURPOSE: |
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* - A quicker, efficient memory allocator alternative to 'malloc' and friends. |
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* - Reduce the possibilities of memory leaks for beginner developers using Raylib. |
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* - A quicker, efficient memory allocator alternative to 'mallocp">()' and friends. |
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* - Reduce the possibilities of memory leaks for beginner developers using raylib. |
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* - Being able to flexibly range check memory if necessary. |
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* |
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* CONFIGURATION: |
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@ -16,6 +16,17 @@ |
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* If not defined, the library is in header only mode and can be included in other headers |
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* or source files without problems. But only ONE file should hold the implementation. |
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* |
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* CHANGELOG: |
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* |
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* v1.0: First version |
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* v1.1: Bug patches for the mempool and addition of object pool |
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* v1.2: Addition of bidirectional arena |
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* v1.3: Several changes: |
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* Pptimizations of allocators |
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* Renamed 'Stack' to 'Arena' |
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* Replaced certain define constants with an anonymous enum |
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* Refactored MemPool to no longer require active or deferred defragging |
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* |
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* |
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* LICENSE: zlib/libpng |
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* |
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@ -61,7 +72,13 @@ |
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// Types and Structures Definition |
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//---------------------------------------------------------------------------------- |
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// Memory Pool |
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enum { |
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MEMPOOL_BUCKET_SIZE = 8, |
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MEMPOOL_BUCKET_BITS = (sizeof(uintptr_t) >> 1) + 1, |
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MEM_SPLIT_THRESHOLD = sizeof(uintptr_t) * 4 |
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}; |
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// Memory pool node |
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typedef struct MemNode MemNode; |
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struct MemNode { |
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size_t size; |
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@ -74,33 +91,25 @@ typedef struct AllocList { |
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size_t len; |
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} AllocList; |
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// Arena allocator. |
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// Arena allocator |
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typedef struct Arena { |
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uintptr_t mem, offs; |
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size_t size; |
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} Arena; |
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enum { |
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MEMPOOL_BUCKET_SIZE = 8, |
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MEMPOOL_BUCKET_BITS = (sizeof(uintptr_t) >> 1) + 1, |
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MEM_SPLIT_THRESHOLD = sizeof(uintptr_t) * 4 |
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}; |
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// Memory pool |
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typedef struct MemPool { |
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AllocList large, buckets[MEMPOOL_BUCKET_SIZE]; |
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Arena arena; |
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} MemPool; |
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// Object Pool |
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// Object pool |
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typedef struct ObjPool { |
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uintptr_t mem, offs; |
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size_t objSize, freeBlocks, memSize; |
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} ObjPool; |
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// Double-Ended Stack aka Deque |
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// Double-ended stack (aka Deque) |
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typedef struct BiStack { |
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uintptr_t mem, front, back; |
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size_t size; |
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@ -166,9 +175,8 @@ RMEMAPI intptr_t BiStackMargins(BiStack destack); |
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#if defined(RMEM_IMPLEMENTATION) |
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#include <stdio.h> // Required for: |
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#include <stdlib.h> // Required for: |
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#include <string.h> // Required for: |
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#include <stdlib.h> // Required for: malloc(), calloc(), free() |
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#include <string.h> // Required for: memset(), memcpy(), memmove() |
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//---------------------------------------------------------------------------------- |
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// Defines and Macros |
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@ -201,18 +209,21 @@ static MemNode *__SplitMemNode(MemNode *const node, const size_t bytes) |
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MemNode *const r = ( MemNode* )(n + (node->size - bytes)); |
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node->size -= bytes; |
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r->size = bytes; |
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return r; |
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} |
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static void __InsertMemNodeBefore(AllocList *const list, MemNode *const insert, MemNode *const curr) |
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{ |
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insert->next = curr; |
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if (curr->prev==NULL) list->head = insert; |
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else |
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{ |
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insert->prev = curr->prev; |
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curr->prev->next = insert; |
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} |
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curr->prev = insert; |
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} |
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@ -220,10 +231,9 @@ static void __ReplaceMemNode(MemNode *const old, MemNode *const replace) |
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{ |
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replace->prev = old->prev; |
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replace->next = old->next; |
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if( old->prev != NULL ) |
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old->prev->next = replace; |
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if( old->next != NULL ) |
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old->next->prev = replace; |
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if (old->prev != NULL) old->prev->next = replace; |
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if (old->next != NULL) old->next->prev = replace; |
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} |
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@ -244,7 +254,9 @@ static MemNode *__RemoveMemNode(AllocList *const list, MemNode *const node) |
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if (list->tail != NULL) list->tail->next = NULL; |
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else list->head = NULL; |
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} |
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list->len--; |
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return node; |
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} |
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@ -253,10 +265,12 @@ static MemNode *__FindMemNode(AllocList *const list, const size_t bytes) |
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for (MemNode *node = list->head; node != NULL; node = node->next) |
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{ |
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if (node->size < bytes) continue; |
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// close in size - reduce fragmentation by not splitting. |
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// Close in size - reduce fragmentation by not splitting |
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else if (node->size <= bytes + MEM_SPLIT_THRESHOLD) return __RemoveMemNode(list, node); |
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else return __SplitMemNode(node, bytes); |
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} |
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return NULL; |
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} |
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@ -271,29 +285,34 @@ static void __InsertMemNode(MemPool *const mempool, AllocList *const list, MemNo |
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{ |
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for (MemNode *iter = list->head; iter != NULL; iter = iter->next) |
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{ |
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if (( uintptr_t )iter == mempool->arena.offs) |
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if ((uintptr_t)iter == mempool->arena.offs) |
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{ |
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mempool->arena.offs += iter->size; |
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__RemoveMemNode(list, iter); |
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iter = list->head; |
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if (iter == NULL) { |
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if (iter == NULL) |
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{ |
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list->head = node; |
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return; |
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} |
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} |
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const uintptr_t inode = ( uintptr_t )node; |
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const uintptr_t iiter = ( uintptr_t )iter; |
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const uintptr_t inode = (uintptr_t)node; |
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const uintptr_t iiter = (uintptr_t)iter; |
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const uintptr_t iter_end = iiter + iter->size; |
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const uintptr_t node_end = inode + node->size; |
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if (iter==node) return; |
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if (iter == node) return; |
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else if (iter < node) |
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{ |
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// node was coalesced prior. |
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if (iter_end > inode) return; |
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else if (iter_end==inode && !is_bucket) |
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else if (p">(iter_end == inode) && !is_bucket) |
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{ |
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// if we can coalesce, do so. |
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iter->size += node->size; |
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return; |
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} |
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else if (iter->next == NULL) |
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@ -302,6 +321,7 @@ static void __InsertMemNode(MemPool *const mempool, AllocList *const list, MemNo |
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iter->next = node; |
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node->prev = iter; |
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list->len++; |
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return; |
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} |
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} |
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@ -309,10 +329,10 @@ static void __InsertMemNode(MemPool *const mempool, AllocList *const list, MemNo |
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{ |
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// Address sort, lowest to highest aka ascending order. |
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if (iiter < node_end) return; |
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else if (iter==list->head && !is_bucket) |
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else if (p">(iter == list->head) && !is_bucket) |
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{ |
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if (iter_end==inode) iter->size += node->size; |
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else if (node_end==iiter) |
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if (iter_end == inode) iter->size += node->size; |
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else if (node_end == iiter) |
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{ |
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node->size += list->head->size; |
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node->next = list->head->next; |
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@ -327,9 +347,10 @@ static void __InsertMemNode(MemPool *const mempool, AllocList *const list, MemNo |
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list->head = node; |
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list->len++; |
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} |
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return; |
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} |
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else if (iter_end==inode && !is_bucket) |
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else if (p">(iter_end == inode) && !is_bucket) |
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{ |
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// if we can coalesce, do so. |
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iter->size += node->size; |
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@ -359,12 +380,14 @@ MemPool CreateMemPool(const size_t size) |
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{ |
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// Align the mempool size to at least the size of an alloc node. |
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uint8_t *const restrict buf = malloc(size*sizeof *buf); |
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if (buf==NULL) return mempool; |
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else |
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{ |
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mempool.arena.size = size; |
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mempool.arena.mem = ( uintptr_t )buf; |
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mempool.arena.mem = (uintptr_t)buf; |
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mempool.arena.offs = mempool.arena.mem + mempool.arena.size; |
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return mempool; |
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} |
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} |
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@ -373,12 +396,14 @@ MemPool CreateMemPool(const size_t size) |
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MemPool CreateMemPoolFromBuffer(void *const restrict buf, const size_t size) |
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{ |
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MemPool mempool = { 0 }; |
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if ((size == 0) || (buf == NULL) || (size <= sizeof(MemNode))) return mempool; |
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else |
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{ |
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mempool.arena.size = size; |
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mempool.arena.mem = ( uintptr_t )buf; |
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mempool.arena.mem = (uintptr_t)buf; |
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mempool.arena.offs = mempool.arena.mem + mempool.arena.size; |
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return mempool; |
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} |
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} |
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@ -388,7 +413,7 @@ void DestroyMemPool(MemPool *const restrict mempool) |
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if (mempool->arena.mem == 0) return; |
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else |
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{ |
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void *const restrict ptr = ( void* )mempool->arena.mem; |
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void *const restrict ptr = (void *)mempool->arena.mem; |
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free(ptr); |
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*mempool = (MemPool){ 0 }; |
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} |
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@ -440,7 +465,8 @@ void *MemPoolAlloc(MemPool *const mempool, const size_t size) |
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// | space | highest addr of block |
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// -------------- |
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new_mem->next = new_mem->prev = NULL; |
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uint8_t *const restrict final_mem = ( uint8_t* )new_mem + sizeof *new_mem; |
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uint8_t *const restrict final_mem = (uint8_t *)new_mem + sizeof *new_mem; |
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return memset(final_mem, 0, new_mem->size - sizeof *new_mem); |
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} |
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} |
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@ -448,20 +474,22 @@ void *MemPoolAlloc(MemPool *const mempool, const size_t size) |
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void *MemPoolRealloc(MemPool *const restrict mempool, void *const ptr, const size_t size) |
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{ |
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if (size > mempool->arena.size) return NULL; |
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// NULL ptr should make this work like regular Allocation. |
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// NULL ptr should make this work like regular Allocation |
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else if (ptr == NULL) return MemPoolAlloc(mempool, size); |
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else if ((uintptr_t)ptr - sizeof(MemNode) < mempool->arena.mem) return NULL; |
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else |
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{ |
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MemNode *const node = ( MemNode* )(( uint8_t* )ptr - sizeof *node); |
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MemNode *const node = (MemNode *)((uint8_t *)ptr - sizeof *node); |
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const size_t NODE_SIZE = sizeof *node; |
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uint8_t *const resized_block = MemPoolAlloc(mempool, size); |
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if (resized_block == NULL) return NULL; |
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else |
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{ |
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MemNode *const resized = ( MemNode* )(resized_block - sizeof *resized); |
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MemNode *const resized = (MemNode *)(resized_block - sizeof *resized); |
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memmove(resized_block, ptr, (node->size > resized->size)? (resized->size - NODE_SIZE) : (node->size - NODE_SIZE)); |
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MemPoolFree(mempool, ptr); |
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return resized_block; |
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} |
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} |
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@ -469,7 +497,8 @@ void *MemPoolRealloc(MemPool *const restrict mempool, void *const ptr, const siz |
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void MemPoolFree(MemPool *const restrict mempool, void *const ptr) |
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{ |
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const uintptr_t p = ( uintptr_t )ptr; |
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const uintptr_t p = (uintptr_t)ptr; |
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if ((ptr == NULL) || (p - sizeof(MemNode) < mempool->arena.mem)) return; |
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else |
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{ |
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@ -511,9 +540,9 @@ size_t GetMemPoolFreeMemory(const MemPool mempool) |
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{ |
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size_t total_remaining = mempool.arena.offs - mempool.arena.mem; |
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for (MemNode *n=mempool.large.head; n != NULL; n = n->next) total_remaining += n->size; |
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for (MemNode *n = mempool.large.head; n != NULL; n = n->next) total_remaining += n->size; |
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for (size_t i=0; i<MEMPOOL_BUCKET_SIZE; i++) for (MemNode *n = mempool.buckets[i].head; n != NULL; n = n->next) total_remaining += n->size; |
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for (size_t i = 0; i < MEMPOOL_BUCKET_SIZE; i++) for (MemNode *n = mempool.buckets[i].head; n != NULL; n = n->next) total_remaining += n->size; |
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return total_remaining; |
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} |
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@ -522,11 +551,13 @@ void MemPoolReset(MemPool *const mempool) |
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{ |
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mempool->large.head = mempool->large.tail = NULL; |
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mempool->large.len = 0; |
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for (size_t i = 0; i < MEMPOOL_BUCKET_SIZE; i++) |
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{ |
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mempool->buckets[i].head = mempool->buckets[i].tail = NULL; |
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mempool->buckets[i].len = 0; |
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} |
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mempool->arena.offs = mempool->arena.mem + mempool->arena.size; |
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} |
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@ -537,19 +568,21 @@ void MemPoolReset(MemPool *const mempool) |
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ObjPool CreateObjPool(const size_t objsize, const size_t len) |
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{ |
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ObjPool objpool = { 0 }; |
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if ((len == 0) || (objsize == 0)) return objpool; |
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else |
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{ |
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const size_t aligned_size = __AlignSize(objsize, sizeof(size_t)); |
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uint8_t *const restrict buf = calloc(len, aligned_size); |
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if (buf == NULL) return objpool; |
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objpool.objSize = aligned_size; |
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objpool.memSize = objpool.freeBlocks = len; |
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objpool.mem = ( uintptr_t )buf; |
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objpool.mem = (uintptr_t)buf; |
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for (size_t i=0; i<objpool.freeBlocks; i++) |
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{ |
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size_t *const restrict index = ( size_t* )(objpool.mem + (i*aligned_size)); |
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size_t *const restrict index = (size_t *)(objpool.mem + (i*aligned_size)); |
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*index = i + 1; |
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} |
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@ -562,8 +595,9 @@ ObjPool CreateObjPoolFromBuffer(void *const restrict buf, const size_t objsize, |
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{ |
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ObjPool objpool = { 0 }; |
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// If the object size isn't large enough to align to a size_t, then we can't use it. |
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// If the object size isn't large enough to align to a size_t, then we can't use it |
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const size_t aligned_size = __AlignSize(objsize, sizeof(size_t)); |
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if ((buf == NULL) || (len == 0) || (objsize < sizeof(size_t)) || (objsize*len != aligned_size*len)) return objpool; |
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else |
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{ |
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@ -573,7 +607,7 @@ ObjPool CreateObjPoolFromBuffer(void *const restrict buf, const size_t objsize, |
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for (size_t i=0; i<objpool.freeBlocks; i++) |
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{ |
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size_t *const restrict index = ( size_t* )(objpool.mem + (i*aligned_size)); |
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size_t *const restrict index = (size_t *)(objpool.mem + (i*aligned_size)); |
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*index = i + 1; |
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} |
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@ -587,9 +621,10 @@ void DestroyObjPool(ObjPool *const restrict objpool) |
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if (objpool->mem == 0) return; |
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else |
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{ |
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void *const restrict ptr = ( void* )objpool->mem; |
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void *const restrict ptr = (void *)objpool->mem; |
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free(ptr); |
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*objpool = (ObjPool){0}; |
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*objpool = (ObjPool){ 0 }; |
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} |
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} |
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@ -600,12 +635,13 @@ void *ObjPoolAlloc(ObjPool *const objpool) |
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// For first allocation, head points to the very first index. |
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// Head = &pool[0]; |
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// ret = Head == ret = &pool[0]; |
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size_t *const restrict block = ( size_t* )objpool->offs; |
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size_t *const restrict block = (size_t *)objpool->offs; |
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objpool->freeBlocks--; |
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// after allocating, we set head to the address of the index that *Head holds. |
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// After allocating, we set head to the address of the index that *Head holds. |
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// Head = &pool[*Head * pool.objsize]; |
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objpool->offs = (objpool->freeBlocks != 0)? objpool->mem + (*block*objpool->objSize) : 0; |
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return memset(block, 0, objpool->objSize); |
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} |
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else return NULL; |
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@ -614,13 +650,14 @@ void *ObjPoolAlloc(ObjPool *const objpool) |
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void ObjPoolFree(ObjPool *const restrict objpool, void *const ptr) |
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{ |
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uintptr_t block = (uintptr_t)ptr; |
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if ((ptr == NULL) || (block < objpool->mem) || (block > objpool->mem + objpool->memSize*objpool->objSize)) return; |
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else |
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{ |
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// When we free our pointer, we recycle the pointer space to store the previous index and then we push it as our new head. |
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// *p = index of Head in relation to the buffer; |
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// Head = p; |
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size_t *const restrict index = ( size_t* )block; |
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size_t *const restrict index = (size_t *)block; |
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*index = (objpool->offs != 0)? (objpool->offs - objpool->mem)/objpool->objSize : objpool->memSize; |
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objpool->offs = block; |
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objpool->freeBlocks++; |
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@ -641,29 +678,34 @@ void ObjPoolCleanUp(ObjPool *const restrict objpool, void **const restrict ptrre |
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//---------------------------------------------------------------------------------- |
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// Module Functions Definition - Double-Ended Stack |
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//---------------------------------------------------------------------------------- |
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BiStack CreateBiStack(const size_t len) |
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{ |
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BiStack destack = { 0 }; |
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if (len == 0) return destack; |
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uint8_t *const buf = malloc(len*sizeof *buf); |
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if (buf==NULL) return destack; |
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|
if (buf == NULL) return destack; |
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|
destack.size = len; |
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|
destack.mem = ( uintptr_t )buf; |
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|
destack.mem = (uintptr_t)buf; |
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|
destack.front = destack.mem; |
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destack.back = destack.mem + len; |
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return destack; |
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} |
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|
BiStack CreateBiStackFromBuffer(void *const buf, const size_t len) |
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|
{ |
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|
|
BiStack destack = { 0 }; |
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|
|
if (len == 0 || buf == NULL) return destack; |
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|
|
if ((len == 0) || (buf == NULL)) return destack; |
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|
else |
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|
|
{ |
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|
|
destack.size = len; |
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|
|
destack.mem = destack.front = ( uintptr_t )buf; |
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|
|
destack.mem = destack.front = (uintptr_t)buf; |
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|
|
destack.back = destack.mem + len; |
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|
|
return destack; |
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|
|
} |
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|
|
} |
|
|
@ -673,9 +715,9 @@ void DestroyBiStack(BiStack *const restrict destack) |
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|
|
if (destack->mem == 0) return; |
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|
|
else |
|
|
|
{ |
|
|
|
uint8_t *const restrict buf = ( uint8_t* )destack->mem; |
|
|
|
uint8_t *const restrict buf = (uint8_t *)destack->mem; |
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|
|
free(buf); |
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|
|
*destack = (BiStack){0}; |
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|
|
*destack = (BiStack){ 0 }; |
|
|
|
} |
|
|
|
} |
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|
|
@ -689,8 +731,9 @@ void *BiStackAllocFront(BiStack *const restrict destack, const size_t len) |
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|
|
if (destack->front + ALIGNED_LEN >= destack->back) return NULL; |
|
|
|
else |
|
|
|
{ |
|
|
|
uint8_t *const restrict ptr = ( uint8_t* )destack->front; |
|
|
|
uint8_t *const restrict ptr = (uint8_t *)destack->front; |
|
|
|
destack->front += ALIGNED_LEN; |
|
|
|
|
|
|
|
return ptr; |
|
|
|
} |
|
|
|
} |
|
|
@ -707,7 +750,8 @@ void *BiStackAllocBack(BiStack *const restrict destack, const size_t len) |
|
|
|
else |
|
|
|
{ |
|
|
|
destack->back -= ALIGNED_LEN; |
|
|
|
uint8_t *const restrict ptr = ( uint8_t* )destack->back; |
|
|
|
uint8_t *const restrict ptr = (uint8_t *)destack->back; |
|
|
|
|
|
|
|
return ptr; |
|
|
|
} |
|
|
|
} |
|
|
@ -737,15 +781,3 @@ inline intptr_t BiStackMargins(const BiStack destack) |
|
|
|
} |
|
|
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|
|
|
|
#endif // RMEM_IMPLEMENTATION |
|
|
|
|
|
|
|
/******* |
|
|
|
* Changelog |
|
|
|
* v1.0: First Creation. |
|
|
|
* v1.1: bug patches for the mempool and addition of object pool. |
|
|
|
* v1.2: addition of bidirectional arena. |
|
|
|
* v1.3: |
|
|
|
* optimizations of allocators. |
|
|
|
* renamed 'Stack' to 'Arena'. |
|
|
|
* replaced certain define constants with an anonymous enum. |
|
|
|
* refactored MemPool to no longer require active or deferred defragging. |
|
|
|
********/ |