ucx: src/basic_mempool.c@f83583a0bbac (annotated)

src/basic_mempool.c@f83583a0bbac (annotated)

src/basic_mempool.c

Wed, 03 Aug 2022 17:27:55 +0200

author: Mike Becker <universe@uap-core.de>
date: Wed, 03 Aug 2022 17:27:55 +0200
changeset 571: f83583a0bbac
child 572: f0f99dd06d9f
permissions: -rw-r--r--

#201 - add mempool implementation

 /*
  * 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/basic_mempool.h"
 #include "cx/utils.h"
 #include <stdint.h>
 #include <string.h>
 #define of_chk_(n) if (SIZE_MAX - sizeof(cx_destructor_func) < (n)) return NULL
 /** Internal structure for denoting pooled memory. */
 typedef struct {
     /** The destructor. */
     cx_destructor_func destructor;
     /**
      * Access to the first byte of the polled memory.
      */
     char c;
 } cx_basic_mempool_memory;
 static int cx_basic_mempool_chcap(
         struct cx_basic_mempool_s *pool,
         size_t newcap
 ) {
     if (newcap < pool->ndata) {
         return 1;
     }
     size_t newcapsz;
     if (cx_szmul(newcap, sizeof(void *), &newcapsz)) {
         return 1;
     }
     void **data = realloc(pool->data, newcapsz);
     if (data) {
         pool->data = data;
         pool->size = newcap;
         return 0;
     } else {
         return 1;
     }
 }
 void *cx_malloc_basic_mempool(
         void *data,
         size_t n
 ) {
     of_chk_(n);
     struct cx_basic_mempool_s *pool = data;
     if (pool->ndata >= pool->size) {
         size_t newcap = pool->size * 2;
         if (newcap < pool->size || cx_basic_mempool_chcap(pool, newcap)) {
             return NULL;
         }
     }
     cx_basic_mempool_memory *mem = cxMalloc(pool->allocator,
                                             sizeof(cx_destructor_func) + n);
     if (mem == NULL) {
         return NULL;
     }
     mem->destructor = NULL;
     pool->data[pool->ndata] = mem;
     pool->ndata++;
     return &(mem->c);
 }
 void *cx_calloc_basic_mempool(
         void *data,
         size_t nelem,
         size_t elsize
 ) {
     size_t msz;
     if (cx_szmul(nelem, elsize, &msz)) {
         return NULL;
     }
     void *ptr = cx_malloc_basic_mempool(data, msz);
     if (ptr == NULL) {
         return NULL;
     }
     memset(ptr, 0, nelem * elsize);
     return ptr;
 }
 void *cx_realloc_basic_mempool(
         void *data,
         void *ptr,
         size_t n
 ) {
     of_chk_(n);
     struct cx_basic_mempool_s *pool = data;
     char *mem = ((char *) ptr) - sizeof(cx_destructor_func);
     char *newm = (char *) cxRealloc(pool->allocator, mem,
                                     n + sizeof(cx_destructor_func));
     if (newm == NULL) {
         return NULL;
     }
     if (mem != newm) {
         cx_for_n(i, pool->ndata) {
             if (pool->data[i] == mem) {
                 pool->data[i] = newm;
                 return newm + sizeof(cx_destructor_func);
             }
         }
         abort();
     } else {
         return newm + sizeof(cx_destructor_func);
     }
 }
 void cx_free_basic_mempool(
         void *data,
         void *ptr
 ) {
     struct cx_basic_mempool_s *pool = data;
     cx_basic_mempool_memory *mem = (cx_basic_mempool_memory *)
             ((char *) ptr - sizeof(cx_destructor_func));
     cx_for_n(i, pool->ndata) {
         if (mem == pool->data[i]) {
             if (mem->destructor != NULL) {
                 mem->destructor(&(mem->c));
             }
             cxFree(pool->allocator, mem);
             size_t last_index = pool->ndata - 1;
             if (i != last_index) {
                 pool->data[i] = pool->data[last_index];
                 pool->data[last_index] = NULL;
             }
             pool->ndata--;
             return;
         }
     }
     abort();
 }
 void cx_basic_mempool_destroy(CxMempool *p) {
     struct cx_basic_mempool_s *pool = (struct cx_basic_mempool_s *) p;
     cx_basic_mempool_memory *mem;
     cx_for_n(i, pool->ndata) {
         mem = (cx_basic_mempool_memory *) pool->data[i];
         if (mem) {
             if (mem->destructor) {
                 mem->destructor(&(mem->c));
             }
             cxFree(pool->allocator, mem);
         }
     }
     free(pool->data);
     free((void *) p->allocator);
     free(pool);
 }
 void cx_basic_mempool_set_destr(
         __attribute__((__unused__)) CxMempool *pool,
         void *ptr,
         cx_destructor_func func
 ) {
     *(cx_destructor_func *) ((char *) ptr - sizeof(cx_destructor_func)) = func;
 }
 static cx_allocator_class cx_basic_mempool_allocator_class = {
         cx_malloc_basic_mempool,
         cx_realloc_basic_mempool,
         cx_calloc_basic_mempool,
         cx_free_basic_mempool
 };
 static cx_mempool_class cx_basic_mempool_class = {
         cx_basic_mempool_destroy,
         cx_basic_mempool_set_destr,
 };
 CxMempool *cxBasicMempoolCreate(
         size_t capacity,
         CxAllocator *allocator
 ) {
     size_t poolsize;
     if (cx_szmul(capacity, sizeof(void *), &poolsize)) {
         return NULL;
     }
     struct cx_basic_mempool_s *pool =
             malloc(sizeof(struct cx_basic_mempool_s));
     if (pool == NULL) {
         return NULL;
     }
     CxAllocator *provided_allocator = malloc(sizeof(CxAllocator));
     if (!provided_allocator) {
         free(pool);
         return NULL;
     }
     provided_allocator->cl = &cx_basic_mempool_allocator_class;
     provided_allocator->data = pool;
     pool->base.cl = &cx_basic_mempool_class;
     pool->base.allocator = provided_allocator;
     pool->data = malloc(poolsize);
     if (pool->data == NULL) {
         free(provided_allocator);
         free(pool);
         return NULL;
     }
     pool->ndata = 0;
     pool->size = capacity;
     pool->allocator = allocator;
     return (CxMempool *) pool;
 }

Mercurial > hg > ucx / annotate

src/basic_mempool.c@f83583a0bbac (annotated)

src/basic_mempool.c