src/server/util/pool_pvt.h

Sat, 13 Jan 2018 18:48:19 +0100

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Sat, 13 Jan 2018 18:48:19 +0100
branch
aio
changeset 192
6a145e13d933
parent 40
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child 415
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permissions
-rw-r--r--

replaces eventfd with pipe and closes aio branch

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
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5 *
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6 * THE BSD LICENSE
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7 *
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8 * Redistribution and use in source and binary forms, with or without
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9 * modification, are permitted provided that the following conditions are met:
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10 *
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11 * Redistributions of source code must retain the above copyright notice, this
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12 * list of conditions and the following disclaimer.
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13 * Redistributions in binary form must reproduce the above copyright notice,
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14 * this list of conditions and the following disclaimer in the documentation
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15 * and/or other materials provided with the distribution.
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16 *
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17 * Neither the name of the nor the names of its contributors may be
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18 * used to endorse or promote products derived from this software without
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19 * specific prior written permission.
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20 *
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21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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25 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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28 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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30 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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31 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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32 */
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33
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34 #ifndef BASE_POOL_PVT_H
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35 #define BASE_POOL_PVT_H
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36
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37 #ifndef BASE_POOL_H
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38 #include "pool.h"
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39 #include <inttypes.h>
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40 #endif /* BASE_POOL_H */
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41
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42 /*
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43 * pool_pvt.h - private definitions for memory pools
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44 */
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45
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46 /* Definitions */
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47
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48 /*
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49 * Define PER_POOL_STATISTICS to get detailed statistics for each
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50 * pool.
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51 */
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52 #ifdef DEBUG
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53 #define PER_POOL_STATISTICS
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54 #endif
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55
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56 /* Define POOL_GLOBAL_STATISTICS to get global pool statistics */
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57 //define POOL_GLOBAL_STATISTICS // TODO: redefine
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58
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59 /*
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60 * When POOL_ZERO_DEBUG is defined, overwrite the contents of freed
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61 * pool data structures and memory with the POOL_ZERO_DEBUG byte value.
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62 */
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63 #ifdef DEBUG
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64 #define POOL_ZERO_DEBUG 0xa
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65 #endif
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66
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67 /*
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68 * DEFAULT_BLOCK_SIZE specifies the minimum granularity, in bytes, used
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69 * in allocating memory from the heap for use with a pool. A request
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70 * for more than DEFAULT_BLOCK_SIZE bytes from a pool will cause a block
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71 * of that size to be allocated from the heap.
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72 */
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73 #define DEFAULT_BLOCK_SIZE (32 * 1024)
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74
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75 /*
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76 * The pool_recycle() mechanism keeps a list of free blocks associated
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77 * with each pool, in order to avoid global locking when doing the
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78 * pool_recycle() operation, or when subsequently allocating memory
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79 * from the pool. DEFAULT_RETENTION_SIZE and DEFAULT_RETENTION_NUM
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80 * specify the maximum number of bytes and blocks, respectively, that
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81 * will be kept on a per-pool free list.
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82 */
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83 #define DEFAULT_RETENTION_SIZE (DEFAULT_BLOCK_SIZE * 2)
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84 #define DEFAULT_RETENTION_NUM 2
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85
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86 /* WORD_SIZE 8 sets us up for 8 byte alignment. */
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87 #define WORD_SIZE 8
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88 #undef ALIGN
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89 #define ALIGN(x) ( (x + WORD_SIZE-1) & (~(WORD_SIZE-1)) )
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90
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91 /* Types */
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92
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93 /*
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94 * pool_stats_t
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95 * This structure contains per pool statistics.
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96 */
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97 #ifdef PER_POOL_STATISTICS
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98 typedef struct pool_stats_t pool_stats_t;
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99 struct pool_stats_t {
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100 PRUint32 poolId; /* pool id */
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101 PRUint32 maxAlloc; /* maximum bytes ever used from pool */
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102 PRUint32 allocCnt; /* count of memory allocations from pool */
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103 PRUint32 freeCnt; /* count of pool memory free operations */
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104 PRUint32 blkAlloc; /* count of block allocations */
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105 PRUint32 blkFree; /* count of blocks freed (on pool_recycle) */
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106 PRThread *thread; /* last thread to use pool */
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107 PRTime created; /* time of pool creation */
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108 };
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109 #endif /* PER_POOL_STATISTICS */
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110
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111 typedef struct pool_config_t pool_config_t;
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112 struct pool_config_t {
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113 int32_t block_size; /* size of blocks to allocate */
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114 int32_t retain_size; /* maximum bytes kept on per-pool free list */
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115 int32_t retain_num; /* maximum blocks kept on per-pool free list */
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116 };
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117
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118 #define POOL_CONFIG_INIT { \
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119 DEFAULT_BLOCK_SIZE, /* block_size */ \
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120 DEFAULT_RETENTION_SIZE, /* retain_size */ \
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121 DEFAULT_RETENTION_NUM, /* retain_num */ \
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122 }
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123
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124 /*
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125 * block_t
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126 * When the user allocates space, a DEFAULT_BLOCK_SIZE (or larger) block
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127 * is created in the pool. This block is used until all the space is
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128 * eaten within it. When all the space is gone, a new block is created.
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129 */
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130 typedef struct block_t block_t;
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131 struct block_t {
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132 char *data; /* the real alloc'd space */
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133 char *start; /* first free byte in block */
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134 char *end; /* ptr to end of block */
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135 block_t *next; /* ptr to next block */
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136 };
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137
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138 #define POOL_PTR_IN_BLOCK(blk, ptr) \
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139 (((char *)(ptr) < (blk)->end) && ((char *)(ptr) >= (blk)->data))
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140
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141 /*
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142 * pool_t
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143 * A pool is a collection of blocks. The blocks consist of multiple
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144 * allocations of memory, but a single allocation cannot be freed by
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145 * itself. Once the memory is allocated it is allocated until the
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146 * entire pool is freed.
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147 */
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148 typedef struct pool_t pool_t;
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149 struct pool_t {
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150 block_t *curr_block; /* current block being used */
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151 block_t *used_blocks; /* blocks that are all used up */
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152 block_t *free_blocks; /* blocks that are free */
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153 int32_t free_size; /* number of bytes in free_blocks */
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154 int32_t free_num; /* number of blocks in free_blocks */
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155 size_t size; /* size of memory in pool */
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156 pool_t *next; /* known_pools list */
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157 #ifdef PER_POOL_STATISTICS
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158 pool_stats_t stats; /* statistics for this pool */
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159 #endif /* PER_POOL_STATISTICS */
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160 };
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161
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162 typedef struct pool_global_stats_t pool_global_stats_t;
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163 struct pool_global_stats_t {
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164 //PRLock *lock; /* lock for access to poolList */ // TODO: remove
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165 pool_t *poolList; /* list of known pools */
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166 int32_t createCnt; /* count of pools created */
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167 int32_t destroyCnt; /* count of pools destroyed */
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168 #ifdef POOL_GLOBAL_STATISTICS
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169 PRUint32 blkAlloc; /* count of block allocations from heap */
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170 PRUint32 blkFree; /* count of blocks freed to heap */
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171 #endif /* POOL_GLOBAL_STATISTICS */
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172 };
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173
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174 /* Private functions for inspecting pool configuration/statistics */
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175
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176 NSAPI_PUBLIC pool_config_t *pool_getConfig(void);
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177
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178 NSAPI_PUBLIC pool_global_stats_t *pool_getGlobalStats(void);
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179
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180 #ifdef PER_POOL_STATISTICS
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181 NSAPI_PUBLIC pool_stats_t *pool_getPoolStats(pool_handle_t *pool_handle);
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182 #endif
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183
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184 #endif /* BASE_POOL_PVT_H */

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