ucx: ucx/mempool.c@a0aa1c15f46b

     1 /*

     2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

     3  *

     4  * Copyright 2013 Olaf Wintermann. All rights reserved.

     5  *

     6  * Redistribution and use in source and binary forms, with or without

     7  * modification, are permitted provided that the following conditions are met:

     8  *

     9  *   1. Redistributions of source code must retain the above copyright

    10  *      notice, this list of conditions and the following disclaimer.

    11  *

    12  *   2. Redistributions in binary form must reproduce the above copyright

    13  *      notice, this list of conditions and the following disclaimer in the

    14  *      documentation and/or other materials provided with the distribution.

    15  *

    16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

    17  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

    19  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE

    20  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

    21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

    22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

    23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

    24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

    25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

    26  * POSSIBILITY OF SUCH DAMAGE.

    27  */

    29 #include <stdlib.h>

    30 #include <string.h>

    31 #include <stdio.h>

    32 #ifdef __cplusplus

    33 #define __STDC_FORMAT_MACROS

    34 #endif

    35 #include <inttypes.h>

    37 #include "mempool.h"

    39 typedef struct {

    40     ucx_destructor destructor;

    41     char c;

    42 } ucx_memchunk;

    44 typedef struct {

    45     ucx_destructor destructor;

    46     void           *ptr;

    47 } ucx_regdestr;

    49 UCX_EXTERN void ucx_mempool_shared_destr(void* ptr) {

    50     ucx_regdestr *rd = (ucx_regdestr*)ptr;

    51     rd->destructor(rd->ptr);

    52 }

    54 UcxMempool *ucx_mempool_new(size_t n) {

    55     UcxMempool *pool = (UcxMempool*)malloc(sizeof(UcxMempool));

    56     if (!pool) {

    57         return NULL;

    58     }

    60     pool->data = (void**) malloc(n * sizeof(void*));

    61     if (pool->data == NULL) {

    62         free(pool);

    63         return NULL;

    64     }

    66     pool->ndata = 0;

    67     pool->size = n;

    68     return pool;

    69 }

    71 int ucx_mempool_chcap(UcxMempool *pool, size_t newcap) {

    72     void **data = (void**) realloc(pool->data, newcap*sizeof(void*));

    73     if (data) {

    74         pool->data = data;

    75         pool->size = newcap;

    76         return EXIT_SUCCESS;

    77     } else {

    78         return EXIT_FAILURE;

    79     }

    80 }

    82 void *ucx_mempool_malloc(UcxMempool *pool, size_t n) {

    83     ucx_memchunk *mem = (ucx_memchunk*)malloc(sizeof(ucx_destructor) + n);

    84     if (!mem) {

    85         return NULL;

    86     }

    88     if (pool->ndata >= pool->size) {

    89         // The hard coded 16 is documented for this function and ucx_mempool_new

    90         ucx_mempool_chcap(pool, pool->size + 16);

    91      }

    93     mem->destructor = NULL;

    94     pool->data[pool->ndata] = mem;

    95     pool->ndata++;

    97     return &(mem->c);

    98 }

   100 void *ucx_mempool_calloc(UcxMempool *pool, size_t nelem, size_t elsize) {

   101     void *ptr = ucx_mempool_malloc(pool, nelem*elsize);

   102     if (!ptr) {

   103         return NULL;

   104     }

   105     memset(ptr, 0, nelem * elsize);

   106     return ptr;

   107 }

   109 void *ucx_mempool_realloc(UcxMempool *pool, void *ptr, size_t n) {

   110     char *mem = ((char*)ptr) - sizeof(ucx_destructor);

   111     char *newm = (char*) realloc(mem, n + sizeof(ucx_destructor));

   112     if (!newm) {

   113         return NULL;

   114     }

   115     if (mem != newm) {

   116         for(size_t i=0 ; i < pool->ndata ; i++) {

   117             if(pool->data[i] == mem) {

   118                 pool->data[i] = newm;

   119                 return newm + sizeof(ucx_destructor);

   120             }

   121         }

   122         fprintf(stderr, "FATAL: 0x%08" PRIxPTR" not in mpool 0x%08" PRIxPTR"\n",

   123           (intptr_t)ptr, (intptr_t)pool);

   124         exit(1);

   125     } else {

   126         return newm + sizeof(ucx_destructor);

   127     }

   128 }

   130 void ucx_mempool_free(UcxMempool *pool, void *ptr) {

   131     ucx_memchunk *chunk = (ucx_memchunk*)((char*)ptr-sizeof(ucx_destructor));

   132     for(size_t i=0 ; i<pool->ndata ; i++) {

   133         if(chunk == pool->data[i]) {

   134             if(chunk->destructor != NULL) {

   135                 chunk->destructor(&chunk->c);

   136             }

   137             free(chunk);

   138             size_t last_index = pool->ndata - 1;

   139             if(i != last_index) {

   140                 pool->data[i] = pool->data[last_index];

   141             }

   142             pool->ndata--;

   143             return;

   144         }

   145     }

   146     fprintf(stderr, "FATAL: 0x%08" PRIxPTR" not in mpool 0x%08" PRIxPTR"\n",

   147             (intptr_t)ptr, (intptr_t)pool);

   148     exit(EXIT_FAILURE);

   149 }

   151 void ucx_mempool_destroy(UcxMempool *pool) {

   152     ucx_memchunk *chunk;

   153     for(size_t i=0 ; i<pool->ndata ; i++) {

   154         chunk = (ucx_memchunk*) pool->data[i];

   155         if(chunk) {

   156             if(chunk->destructor) {

   157                 chunk->destructor(&(chunk->c));

   158             }

   159             free(chunk);

   160         }

   161     }

   162     free(pool->data);

   163     free(pool);

   164 }

   166 void ucx_mempool_set_destr(void *ptr, ucx_destructor func) {

   167     *(ucx_destructor*)((char*)ptr-sizeof(ucx_destructor)) = func;

   168 }

   170 void ucx_mempool_reg_destr(UcxMempool *pool, void *ptr, ucx_destructor destr) {

   171     ucx_regdestr *rd = (ucx_regdestr*)ucx_mempool_malloc(

   172             pool,

   173             sizeof(ucx_regdestr));

   174     rd->destructor = destr;

   175     rd->ptr = ptr;

   176     ucx_mempool_set_destr(rd, ucx_mempool_shared_destr);

   177 }

   179 UcxAllocator* ucx_mempool_allocator(UcxMempool *pool) {

   180     UcxAllocator *allocator = (UcxAllocator*)ucx_mempool_malloc(

   181             pool, sizeof(UcxAllocator));

   182     if(!allocator) {

   183         return NULL;

   184     }

   185     allocator->malloc = (ucx_allocator_malloc)ucx_mempool_malloc;

   186     allocator->calloc = (ucx_allocator_calloc)ucx_mempool_calloc;

   187     allocator->realloc = (ucx_allocator_realloc)ucx_mempool_realloc;

   188     allocator->free = (ucx_allocator_free)ucx_mempool_free;

   189     allocator->pool = pool;

   190     return allocator;

   191 }

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