ucx: src/mempool.c@edb9f875b7f9 (annotated)

src/mempool.c@edb9f875b7f9 (annotated)

src/mempool.c

Fri, 12 Apr 2024 21:48:12 +0200

author: Mike Becker <universe@uap-core.de>
date: Fri, 12 Apr 2024 21:48:12 +0200
changeset 849: edb9f875b7f9
parent 727: d92a59f5d261
permissions: -rw-r--r--

improves interface of cx_sprintf() variants

 /*
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
  *
  * Copyright 2021 Mike Becker, 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 "cx/mempool.h"
 #include "cx/utils.h"
 #include <string.h>
 struct cx_mempool_memory_s {
     /** The destructor. */
     cx_destructor_func destructor;
     /** The actual memory. */
     char c[];
 };
 static void *cx_mempool_malloc(
         void *p,
         size_t n
 ) {
     struct cx_mempool_s *pool = p;
     if (pool->size >= pool->capacity) {
         size_t newcap = pool->capacity - (pool->capacity % 16) + 16;
         struct cx_mempool_memory_s **newdata = realloc(pool->data, newcap*sizeof(struct cx_mempool_memory_s*));
         if (newdata == NULL) {
             return NULL;
         }
         pool->data = newdata;
         pool->capacity = newcap;
     }
     struct cx_mempool_memory_s *mem = malloc(sizeof(cx_destructor_func) + n);
     if (mem == NULL) {
         return NULL;
     }
     mem->destructor = pool->auto_destr;
     pool->data[pool->size] = mem;
     pool->size++;
     return mem->c;
 }
 static void *cx_mempool_calloc(
         void *p,
         size_t nelem,
         size_t elsize
 ) {
     size_t msz;
     if (cx_szmul(nelem, elsize, &msz)) {
         return NULL;
     }
     void *ptr = cx_mempool_malloc(p, msz);
     if (ptr == NULL) {
         return NULL;
     }
     memset(ptr, 0, nelem * elsize);
     return ptr;
 }
 static void *cx_mempool_realloc(
         void *p,
         void *ptr,
         size_t n
 ) {
     struct cx_mempool_s *pool = p;
     struct cx_mempool_memory_s *mem, *newm;
     mem = (struct cx_mempool_memory_s*)(((char *) ptr) - sizeof(cx_destructor_func));
     newm = realloc(mem, n + sizeof(cx_destructor_func));
     if (newm == NULL) {
         return NULL;
     }
     if (mem != newm) {
         cx_for_n(i, pool->size) {
             if (pool->data[i] == mem) {
                 pool->data[i] = newm;
                 return ((char*)newm) + sizeof(cx_destructor_func);
             }
         }
         abort();
     } else {
         return ptr;
     }
 }
 static void cx_mempool_free(
         void *p,
         void *ptr
 ) {
     struct cx_mempool_s *pool = p;
     struct cx_mempool_memory_s *mem = (struct cx_mempool_memory_s *)
             ((char *) ptr - sizeof(cx_destructor_func));
     cx_for_n(i, pool->size) {
         if (mem == pool->data[i]) {
             if (mem->destructor) {
                 mem->destructor(mem->c);
             }
             free(mem);
             size_t last_index = pool->size - 1;
             if (i != last_index) {
                 pool->data[i] = pool->data[last_index];
                 pool->data[last_index] = NULL;
             }
             pool->size--;
             return;
         }
     }
     abort();
 }
 void cxMempoolDestroy(CxMempool *pool) {
     struct cx_mempool_memory_s *mem;
     cx_for_n(i, pool->size) {
         mem = pool->data[i];
         if (mem->destructor) {
             mem->destructor(mem->c);
         }
         free(mem);
     }
     free(pool->data);
     free((void*) pool->allocator);
     free(pool);
 }
 void cxMempoolSetDestructor(
         void *ptr,
         cx_destructor_func func
 ) {
     *(cx_destructor_func *) ((char *) ptr - sizeof(cx_destructor_func)) = func;
 }
 struct cx_mempool_foreign_mem_s {
     cx_destructor_func destr;
     void* mem;
 };
 static void cx_mempool_destr_foreign_mem(void* ptr) {
     struct cx_mempool_foreign_mem_s *fm = ptr;
     fm->destr(fm->mem);
 }
 int cxMempoolRegister(
         CxMempool *pool,
         void *memory,
         cx_destructor_func destr
 ) {
     struct cx_mempool_foreign_mem_s *fm = cx_mempool_malloc(
             pool,
             sizeof(struct cx_mempool_foreign_mem_s)
     );
     if (fm == NULL) return 1;
     fm->mem = memory;
     fm->destr = destr;
     *(cx_destructor_func *) ((char *) fm - sizeof(cx_destructor_func)) = cx_mempool_destr_foreign_mem;
     return 0;
 }
 static cx_allocator_class cx_mempool_allocator_class = {
         cx_mempool_malloc,
         cx_mempool_realloc,
         cx_mempool_calloc,
         cx_mempool_free
 };
 CxMempool *cxMempoolCreate(
         size_t capacity,
         cx_destructor_func destr
 ) {
     size_t poolsize;
     if (cx_szmul(capacity, sizeof(struct cx_mempool_memory_s*), &poolsize)) {
         return NULL;
     }
     struct cx_mempool_s *pool =
             malloc(sizeof(struct cx_mempool_s));
     if (pool == NULL) {
         return NULL;
     }
     CxAllocator *provided_allocator = malloc(sizeof(CxAllocator));
     if (provided_allocator == NULL) {
         free(pool);
         return NULL;
     }
     provided_allocator->cl = &cx_mempool_allocator_class;
     provided_allocator->data = pool;
     pool->allocator = provided_allocator;
     pool->data = malloc(poolsize);
     if (pool->data == NULL) {
         free(provided_allocator);
         free(pool);
         return NULL;
     }
     pool->size = 0;
     pool->capacity = capacity;
     pool->auto_destr = destr;
     return (CxMempool *) pool;
 }

Mercurial > hg > ucx / annotate

src/mempool.c@edb9f875b7f9 (annotated)

src/mempool.c