ucx: ucx/mempool.c@621a4430c404 (annotated)

ucx/mempool.c@621a4430c404 (annotated)

ucx/mempool.c

Fri, 05 Oct 2012 11:52:53 +0200

author: Mike Becker <universe@uap-core.de>
date: Fri, 05 Oct 2012 11:52:53 +0200
changeset 48: 621a4430c404
parent 28: 1666cbeb1db8
child 50: ff194559eb41
permissions: -rw-r--r--

map can now load values from file into pooled memory

use with care when using a decoder that also allocates memory

 /*
  *
  */
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 #include <errno.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);
 }
 void *ucx_default_malloc(UcxMempool *ignore, size_t n) {
     return malloc(n);
 }
 void *ucx_default_calloc(UcxMempool *ignore, size_t n, size_t size) {
     return calloc(n, size);
 }
 void *ucx_default_realloc(UcxMempool *ignore, void *data, size_t n) {
     return realloc(data, n);
 }
 UcxMempool *ucx_mempool_new(size_t n) {
     UcxMempool *pool = (UcxMempool*)malloc(sizeof(UcxMempool));
     if (pool == NULL) return NULL;
     pool->data = 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 = realloc(pool->data, newcap*sizeof(void*));
     if (data == NULL) {
         return ENOMEM;
     } 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(int i=0;i<pool->ndata;i++) {
             if(pool->data[i] == mem) {
                 pool->data[i] = newm;
                 return newm + sizeof(ucx_destructor);
             }
         }
         fprintf(stderr, "FATAL: %8x not in mpool %8x\n", ptr, pool);
         exit(1);
     } else {
         return newm + sizeof(ucx_destructor);
     }
 }
 void ucx_mempool_free(UcxMempool *pool) {
     ucx_memchunk *chunk;
     for(int i=0;i<pool->ndata;i++) {
         chunk = (ucx_memchunk*) pool->data[i];
         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);
 }

Mercurial > hg > ucx / annotate

ucx/mempool.c@621a4430c404 (annotated)

ucx/mempool.c