src/server/util/thrpool.c

Wed, 15 Mar 2023 19:46:02 +0100

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Wed, 15 Mar 2023 19:46:02 +0100
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parent 408
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child 556
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minimal support for ldap groups

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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 2013 Olaf Wintermann. All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 */
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28
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29 #include <stdio.h>
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30 #include <stdlib.h>
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31 #include <unistd.h>
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32
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33 #include "atomic.h"
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34 #include "thrpool.h"
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35
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36 static threadpool_job kill_job;
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37
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38 threadpool_t* threadpool_new(int min, int max) {
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39 log_ereport(LOG_VERBOSE, "new threadpool (min: %d, max: %d)", min, max);
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40 threadpool_t *pool = malloc(sizeof(threadpool_t));
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41 pool->queue = NULL;
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42 pool->queue_len = 0;
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43 pool->num_idle = 0;
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44 pool->min_threads = min;
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45 pool->max_threads = max;
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46 pool->num_threads = 0;
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48 pthread_mutex_init(&pool->queue_lock, NULL);
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49 pthread_mutex_init(&pool->avlbl_lock, NULL);
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50 pthread_cond_init(&pool->available, NULL);
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51
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52 return pool;
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53 }
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54
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55 int threadpool_start(threadpool_t *pool) {
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56 /* create pool threads */
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57 for(int i=0;i<pool->min_threads;i++) {
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58 pthread_t t;
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59 if (pthread_create(&t, NULL, threadpool_func, pool) != 0) {
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60 log_ereport(LOG_FAILURE, "threadpool_start: pthread_create failed: %s", strerror(errno));
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61 return 1;
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62 }
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63 }
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64 return 0;
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65 }
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67 void* threadpool_func(void *data) {
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68 threadpool_t *pool = (threadpool_t*)data;
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70 ws_atomic_inc32(&pool->num_threads);
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71 for(;;) {
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72 threadpool_job *job = threadpool_get_job(pool);
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73 if(job == &kill_job) {
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74 break;
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75 }
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77 job->callback(job->data);
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79 free(job);
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80 }
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81 ws_atomic_dec32(&pool->num_threads);
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82 return NULL;
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83 }
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84
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85 threadpool_job* threadpool_get_job(threadpool_t *pool) {
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86 pthread_mutex_lock(&pool->queue_lock);
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87
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88 threadpool_job *job = NULL;
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89 pool->num_idle++;
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90 while(job == NULL) {
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91 if(pool->queue_len == 0) {
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92 pthread_cond_wait(&pool->available, &pool->queue_lock);
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93 continue;
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94 } else {
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95 pool_queue_t *q = pool->queue;
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96 job = q->job;
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97 pool->queue = q->next;
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98 pool->queue_len--;
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99 free(q);
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100 }
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101 }
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102 pool->num_idle--;
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103
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104 pthread_mutex_unlock(&pool->queue_lock);
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105 return job;
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106 }
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107
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108 void threadpool_run(threadpool_t *pool, job_callback_f func, void *data) {
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109 // TODO: handle errors
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110
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111 if(pool->num_threads == 0) {
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112 threadpool_start(pool);
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113 }
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114
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115 threadpool_job *job = malloc(sizeof(threadpool_job));
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116 job->callback = func;
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117 job->data = data;
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118
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119 pthread_mutex_lock(&pool->queue_lock);
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120 threadpool_enqueue_job(pool, job);
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121
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122 int create_thread = 0;
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123 int destroy_thread = 0;
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124 int diff = pool->queue_len - pool->num_idle;
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125 if(diff > 0 && pool->num_threads < pool->max_threads) {
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126 create_thread = 1;
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127 } else if(diff < 0 && pool->num_threads > pool->min_threads) {
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128 destroy_thread = 1;
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129 }
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130
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131 //if(pool->queue_len == 1) {
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132 pthread_cond_signal(&pool->available);
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133 //}
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134
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135 if(create_thread) {
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136 pthread_t t;
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137 if (pthread_create(&t, NULL, threadpool_func, pool) != 0) {
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138 log_ereport(LOG_FAILURE, "threadpool_run: pthread_create failed: %s", strerror(errno));
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139 }
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140 }
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141 if(destroy_thread) {
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142 threadpool_enqueue_job(pool, &kill_job);
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143 pthread_cond_signal(&pool->available);
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144 }
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145
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146 pthread_mutex_unlock(&pool->queue_lock);
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147 }
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148
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149 void threadpool_enqueue_job(threadpool_t *pool, threadpool_job *job) {
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150 pool_queue_t *q = malloc(sizeof(pool_queue_t));
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151 q->job = job;
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152 q->next = NULL;
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153
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154 if(pool->queue == NULL) {
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155 pool->queue = q;
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156 } else {
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157 pool_queue_t *last_elem = pool->queue;
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158 while(last_elem->next != NULL) {
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159 last_elem = last_elem->next;
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160 }
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161 last_elem->next = q;
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162 }
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163 pool->queue_len++;
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164 }

mercurial