src/server/ucx/mempool.c

Sat, 12 Jan 2013 14:00:47 +0100

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Sat, 12 Jan 2013 14:00:47 +0100
changeset 46
636e05eb48f6
parent 31
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child 71
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permissions
-rw-r--r--

cleaning up resources after requests

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1 /*
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2 *
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3 */
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4
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5 #include <stdlib.h>
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6 #include <string.h>
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7 #include <stdio.h>
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8 #include <errno.h>
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9
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10 #include "mempool.h"
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11
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12 typedef struct {
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13 ucx_destructor destructor;
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14 char c;
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15 } ucx_memchunk;
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16
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17 typedef struct {
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18 ucx_destructor destructor;
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19 void *ptr;
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20 } ucx_regdestr;
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21
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22 void ucx_mempool_shared_destr(void* ptr) {
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23 ucx_regdestr *rd = (ucx_regdestr*)ptr;
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24 rd->destructor(rd->ptr);
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25 }
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26
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27 UcxMempool *ucx_mempool_new(size_t n) {
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28 UcxMempool *pool = (UcxMempool*)malloc(sizeof(UcxMempool));
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29 if (pool == NULL) return NULL;
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30
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31 pool->data = malloc(n * sizeof(void*));
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32 if (pool->data == NULL) {
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33 free(pool);
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34 return NULL;
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35 }
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36
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37 pool->ndata = 0;
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38 pool->size = n;
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39 return pool;
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40 }
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41
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42 int ucx_mempool_chcap(UcxMempool *pool, size_t newcap) {
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43 void **data = realloc(pool->data, newcap*sizeof(void*));
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44 if (data == NULL) {
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45 return ENOMEM;
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46 } else {
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47 pool->data = data;
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48 pool->size = newcap;
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49 return EXIT_SUCCESS;
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50 }
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51 }
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52
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53 void *ucx_mempool_malloc(UcxMempool *pool, size_t n) {
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54 ucx_memchunk *mem = (ucx_memchunk*)malloc(sizeof(ucx_destructor) + n);
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55 if (mem == NULL) return NULL;
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56
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57 if (pool->ndata >= pool->size) {
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58 ucx_mempool_chcap(pool, pool->size + 16);
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59 }
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60
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61 mem->destructor = NULL;
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62 pool->data[pool->ndata] = mem;
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63 pool->ndata++;
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64
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65 return &mem->c;
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66 }
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67
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68 void *ucx_mempool_calloc(UcxMempool *pool, size_t nelem, size_t elsize) {
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69 void *ptr = ucx_mempool_malloc(pool, nelem*elsize);
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70 if(ptr == NULL) {
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71 return NULL;
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72 }
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73 memset(ptr, 0, nelem * elsize);
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74 return ptr;
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75 }
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76
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77 void *ucx_mempool_realloc(UcxMempool *pool, void *ptr, size_t n) {
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78 char *mem = ((char*)ptr) - sizeof(ucx_destructor);
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79 char *newm = (char*) realloc(mem, n + sizeof(ucx_destructor));
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80 if (newm == NULL) return NULL;
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81 if (mem != newm) {
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82 for(int i=0;i<pool->ndata;i++) {
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83 if(pool->data[i] == mem) {
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84 pool->data[i] = newm;
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85 return newm + sizeof(ucx_destructor);
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86 }
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87 }
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88 fprintf(stderr, "FATAL: %8x not in mpool %8x\n", ptr, pool);
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89 exit(1);
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90 } else {
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91 return newm + sizeof(ucx_destructor);
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92 }
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93 }
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94
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95 void ucx_mempool_free(UcxMempool *pool) {
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96 ucx_memchunk *chunk;
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97 for(int i=0;i<pool->ndata;i++) {
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98 chunk = (ucx_memchunk*) pool->data[i];
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99 if(chunk->destructor != NULL) {
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100 chunk->destructor(&chunk->c);
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101 }
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102 free(chunk);
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103 }
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104 free(pool->data);
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105 free(pool);
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106 }
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107
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108 void ucx_mempool_set_destr(void *ptr, ucx_destructor func) {
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109 *(ucx_destructor*)((char*)ptr-sizeof(ucx_destructor)) = func;
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110 }
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111
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112 void ucx_mempool_reg_destr(UcxMempool *pool, void *ptr, ucx_destructor destr) {
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113 ucx_regdestr *rd = (ucx_regdestr*)ucx_mempool_malloc(
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114 pool,
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115 sizeof(ucx_regdestr));
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116 rd->destructor = destr;
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117 rd->ptr = ptr;
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118 ucx_mempool_set_destr(rd, ucx_mempool_shared_destr);
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119 }

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