ucx: ucx/mempool.c@8693d7874773 (annotated)

ucx/mempool.c@8693d7874773 (annotated)

ucx/mempool.c

Mon, 15 Jul 2013 16:59:52 +0200

author: Olaf Wintermann <olaf.wintermann@gmail.com>
date: Mon, 15 Jul 2013 16:59:52 +0200
changeset 113: 8693d7874773
parent 103: 08018864fb91
child 116: 234920008754
permissions: -rw-r--r--

added mempool allocator

 /*
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
  *
  * Copyright 2013 Olaf Wintermann. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *   1. Redistributions of source code must retain the above copyright
  *      notice, this list of conditions and the following disclaimer.
  *
  *   2. Redistributions in binary form must reproduce the above copyright
  *      notice, this list of conditions and the following disclaimer in the
  *      documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.
  */
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 #ifdef __cplusplus
 #define __STDC_FORMAT_MACROS
 #endif
 #include <inttypes.h>
 #include "mempool.h"
 typedef struct {
     ucx_destructor destructor;
     char c;
 } ucx_memchunk;
 typedef struct {
     ucx_destructor destructor;
     void           *ptr;
 } ucx_regdestr;
 void ucx_mempool_shared_destr(void* ptr) {
     ucx_regdestr *rd = (ucx_regdestr*)ptr;
     rd->destructor(rd->ptr);
 }
 UcxMempool *ucx_mempool_new(size_t n) {
     UcxMempool *pool = (UcxMempool*)malloc(sizeof(UcxMempool));
     if (pool == NULL) return NULL;
     pool->data = (void**) malloc(n * sizeof(void*));
     if (pool->data == NULL) {
         free(pool);
         return NULL;
     }
     pool->ndata = 0;
     pool->size = n;
     return pool;
 }
 int ucx_mempool_chcap(UcxMempool *pool, size_t newcap) {
     void **data = (void**) realloc(pool->data, newcap*sizeof(void*));
     if (data == NULL) {
         return 1;
     } else {
         pool->data = data;
         pool->size = newcap;
         return EXIT_SUCCESS;
     }
 }
 void *ucx_mempool_malloc(UcxMempool *pool, size_t n) {
     ucx_memchunk *mem = (ucx_memchunk*)malloc(sizeof(ucx_destructor) + n);
     if (mem == NULL) return NULL;
     if (pool->ndata >= pool->size) {
         ucx_mempool_chcap(pool, pool->size + 16);
      }
     mem->destructor = NULL;
     pool->data[pool->ndata] = mem;
     pool->ndata++;
     return &mem->c;
 }
 void *ucx_mempool_calloc(UcxMempool *pool, size_t nelem, size_t elsize) {
     void *ptr = ucx_mempool_malloc(pool, nelem*elsize);
     if(ptr == NULL) {
         return NULL;
     }
     memset(ptr, 0, nelem * elsize);
     return ptr;
 }
 void *ucx_mempool_realloc(UcxMempool *pool, void *ptr, size_t n) {
     char *mem = ((char*)ptr) - sizeof(ucx_destructor);
     char *newm = (char*) realloc(mem, n + sizeof(ucx_destructor));
     if (newm == NULL) return NULL;
     if (mem != newm) {
         for(size_t i=0 ; i < pool->ndata ; i++) {
             if(pool->data[i] == mem) {
                 pool->data[i] = newm;
                 return newm + sizeof(ucx_destructor);
             }
         }
         fprintf(stderr, "FATAL: 0x%08"PRIxPTR" not in mpool 0x%08" PRIxPTR"\n",
           (intptr_t)ptr, (intptr_t)pool);
         exit(1);
     } else {
         return newm + sizeof(ucx_destructor);
     }
 }
 void ucx_mempool_free(UcxMempool *pool, void *ptr) {
     ucx_memchunk *chunk = (ucx_memchunk*)((char*)ptr-sizeof(ucx_destructor));
     for(size_t i=0 ; i<pool->ndata ; i++) {
         if(chunk == pool->data[i]) {
             if(chunk->destructor != NULL) {
                 chunk->destructor(&chunk->c);
             }
             free(chunk);
             size_t last_index = pool->ndata - 1;
             if(i != last_index) {
                 pool->data[i] = pool->data[last_index];
             }
             pool->ndata--;
             return;
         }
     }
     fprintf(stderr, "FATAL: 0x%08"PRIxPTR" not in mpool 0x%08" PRIxPTR"\n",
             (intptr_t)ptr, (intptr_t)pool);
     exit(1);
 }
 void ucx_mempool_destroy(UcxMempool *pool) {
     ucx_memchunk *chunk;
     for(size_t i=0 ; i<pool->ndata ; i++) {
         chunk = (ucx_memchunk*) pool->data[i];
         if(chunk) {
             if(chunk->destructor != NULL) {
                 chunk->destructor(&chunk->c);
             }
             free(chunk);
         }
     }
     free(pool->data);
     free(pool);
 }
 void ucx_mempool_set_destr(void *ptr, ucx_destructor func) {
     *(ucx_destructor*)((char*)ptr-sizeof(ucx_destructor)) = func;
 }
 void ucx_mempool_reg_destr(UcxMempool *pool, void *ptr, ucx_destructor destr) {
     ucx_regdestr *rd = (ucx_regdestr*)ucx_mempool_malloc(
             pool,
             sizeof(ucx_regdestr));
     rd->destructor = destr;
     rd->ptr = ptr;
     ucx_mempool_set_destr(rd, ucx_mempool_shared_destr);
 }
 UcxAllocator* ucx_mempool_allocator(UcxMempool *pool) {
     UcxAllocator *allocator = (UcxAllocator*)ucx_mempool_malloc(
             pool, sizeof(UcxAllocator));
     if(!allocator) {
         return NULL;
     }
     allocator->malloc = (ucx_allocator_malloc)ucx_mempool_malloc;
     allocator->calloc = (ucx_allocator_calloc)ucx_mempool_calloc;
     allocator->realloc = (ucx_allocator_realloc)ucx_mempool_realloc;
     allocator->free = (ucx_allocator_free)ucx_mempool_free;
     allocator->pool = pool;
     return allocator;
 }

Mercurial > hg > ucx / annotate

ucx/mempool.c@8693d7874773 (annotated)

ucx/mempool.c