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annotate freeDiameter/p_expiry.c @ 37:cc3c59fe98fe

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Lot of cleanups in peer structure management
author Sebastien Decugis <sdecugis@nict.go.jp>
date Thu, 05 Nov 2009 14:28:46 +0900
parents 1498b3c7304c
children a58f0757c06a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*********************************************************************************************************
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2 * Software License Agreement (BSD License) *
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3 * Author: Sebastien Decugis <sdecugis@nict.go.jp> *
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4 * *
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5 * Copyright (c) 2009, WIDE Project and NICT *
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6 * All rights reserved. *
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7 * *
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8 * Redistribution and use of this software in source and binary forms, with or without modification, are *
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9 * 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 *
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12 * copyright notice, this list of conditions and the *
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13 * following disclaimer. *
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14 * *
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15 * * Redistributions in binary form must reproduce the above *
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16 * copyright notice, this list of conditions and the *
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17 * following disclaimer in the documentation and/or other *
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18 * materials provided with the distribution. *
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19 * *
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20 * * Neither the name of the WIDE Project or NICT nor the *
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21 * names of its contributors may be used to endorse or *
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22 * promote products derived from this software without *
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23 * specific prior written permission of WIDE Project and *
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24 * NICT. *
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25 * *
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26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED *
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27 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A *
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28 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR *
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29 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT *
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30 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS *
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31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR *
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32 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF *
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33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
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34 *********************************************************************************************************/
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35
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36 #include "fD.h"
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37
36
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38 /* Delay for garbage collection of expired peers, in seconds */
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39 #define GC_TIME 120
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40
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41 static pthread_t exp_thr;
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42 static pthread_t gc_thr;
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43 static struct fd_list exp_list = FD_LIST_INITIALIZER( exp_list );
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44 static pthread_cond_t exp_cnd = PTHREAD_COND_INITIALIZER;
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45 static pthread_mutex_t exp_mtx = PTHREAD_MUTEX_INITIALIZER;
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46
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47 static void * gc_th_fct(void * arg)
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48 {
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49 fd_log_threadname ( "Peers/garb. col." );
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50 TRACE_ENTRY( "%p", arg );
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51
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52 do {
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53 struct fd_list * li, purge = FD_LIST_INITIALIZER(purge);
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54
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55 sleep(GC_TIME); /* sleep is a cancellation point */
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56
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57 /* Now check in the peers list if any peer can be deleted */
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58 CHECK_FCT_DO( pthread_rwlock_wrlock(&fd_g_peers_rw), goto error );
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59
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60 for (li = fd_g_peers.next; li != &fd_g_peers; li = li->next) {
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61 struct fd_peer * peer = (struct fd_peer *)li;
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62
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63 if (peer->p_hdr.info.runtime.pir_state != STATE_ZOMBIE)
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64 continue;
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65
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66 if (peer->p_hdr.info.config.pic_flags.persist == PI_PRST_ALWAYS)
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67 continue; /* This peer was not supposed to terminate, keep it in the list for debug */
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68
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69 /* Ok, the peer was expired, let's remove it */
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70 li = li->prev; /* to avoid breaking the loop */
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71 fd_list_unlink(&peer->p_hdr.chain);
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72 fd_list_insert_before(&purge, &peer->p_hdr.chain);
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73 }
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74
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75 CHECK_FCT_DO( pthread_rwlock_unlock(&fd_g_peers_rw), goto error );
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76
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77 /* Now delete peers that are in the purge list */
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78 while (!FD_IS_LIST_EMPTY(&purge)) {
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79 struct fd_peer * peer = (struct fd_peer *)(purge.next);
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80 fd_list_unlink(&peer->p_hdr.chain);
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81 TRACE_DEBUG(INFO, "Garbage Collect: delete zombie peer '%s'", peer->p_hdr.info.pi_diamid);
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82 CHECK_FCT_DO( fd_peer_free(&peer), /* Continue... what else to do ? */ );
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83 }
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84 } while (1);
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85
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86 error:
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87 TRACE_DEBUG(INFO, "An error occurred in peers module! GC thread is terminating...");
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88 ASSERT(0);
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89 CHECK_FCT_DO(fd_event_send(fd_g_config->cnf_main_ev, FDEV_TERMINATE, 0, NULL), );
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90 return NULL;
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91 }
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92
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93
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94 static void * exp_th_fct(void * arg)
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95 {
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96 fd_log_threadname ( "Peers/expire" );
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97 TRACE_ENTRY( "%p", arg );
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98
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99 CHECK_POSIX_DO( pthread_mutex_lock(&exp_mtx), goto error );
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100 pthread_cleanup_push( fd_cleanup_mutex, &exp_mtx );
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101
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102 do {
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103 struct timespec now;
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104 struct fd_peer * first;
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105
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106 /* Check if there are expiring sessions available */
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107 if (FD_IS_LIST_EMPTY(&exp_list)) {
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108 /* Just wait for a change or cancelation */
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109 CHECK_POSIX_DO( pthread_cond_wait( &exp_cnd, &exp_mtx ), goto error );
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110 /* Restart the loop on wakeup */
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111 continue;
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112 }
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113
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114 /* Get the pointer to the peer that expires first */
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115 first = (struct fd_peer *)(exp_list.next->o);
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116 ASSERT( CHECK_PEER(first) );
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117
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118 /* Get the current time */
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119 CHECK_SYS_DO( clock_gettime(CLOCK_REALTIME, &now), goto error );
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120
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121 /* If first peer is not expired, we just wait until it happens */
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122 if ( TS_IS_INFERIOR( &now, &first->p_exp_timer ) ) {
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123
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124 CHECK_POSIX_DO2( pthread_cond_timedwait( &exp_cnd, &exp_mtx, &first->p_exp_timer ),
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125 ETIMEDOUT, /* ETIMEDOUT is a normal return value, continue */,
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126 /* on other error, */ goto error );
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127
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128 /* on wakeup, loop */
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129 continue;
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130 }
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131
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132 /* Now, the first peer in the list is expired; signal it */
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133 fd_list_unlink( &first->p_expiry );
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134 CHECK_FCT_DO( fd_event_send(first->p_events, FDEVP_TERMINATE, 0, NULL), goto error );
14
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135
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136 } while (1);
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137
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138 pthread_cleanup_pop( 1 );
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139 error:
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140 TRACE_DEBUG(INFO, "An error occurred in peers module! Expiry thread is terminating...");
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141 ASSERT(0);
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142 CHECK_FCT_DO(fd_event_send(fd_g_config->cnf_main_ev, FDEV_TERMINATE, 0, NULL), );
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143 return NULL;
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144 }
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145
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146 /* Initialize peers expiry mechanism */
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147 int fd_p_expi_init(void)
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148 {
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149 TRACE_ENTRY();
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150 CHECK_FCT( pthread_create( &exp_thr, NULL, exp_th_fct, NULL ) );
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151 CHECK_FCT( pthread_create( &gc_thr, NULL, gc_th_fct, NULL ) );
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152 return 0;
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153 }
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154
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155 /* Finish peers expiry mechanism */
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156 int fd_p_expi_fini(void)
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157 {
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158 CHECK_FCT_DO( fd_thr_term(&exp_thr), );
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159 CHECK_POSIX( pthread_mutex_lock(&exp_mtx) );
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160 while (!FD_IS_LIST_EMPTY(&exp_list)) {
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161 struct fd_peer * peer = (struct fd_peer *)(exp_list.next->o);
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162 fd_list_unlink(&peer->p_expiry );
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163 }
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164 CHECK_POSIX( pthread_mutex_unlock(&exp_mtx) );
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165
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166 CHECK_FCT_DO( fd_thr_term(&gc_thr), );
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167 return 0;
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168 }
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169
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170 /* Add / requeue a peer in the expiry list */
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171 int fd_p_expi_update(struct fd_peer * peer )
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172 {
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173 TRACE_ENTRY("%p", peer);
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174 CHECK_PARAMS( CHECK_PEER(peer) );
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175
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176 CHECK_POSIX( pthread_mutex_lock(&exp_mtx) );
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177
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178 fd_list_unlink(&peer->p_expiry );
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179
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180 /* if peer expires */
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181 if (peer->p_hdr.info.config.pic_flags.exp) {
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182 struct fd_list * li;
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183
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184 /* update the p_exp_timer value */
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185 CHECK_SYS( clock_gettime(CLOCK_REALTIME, &peer->p_exp_timer) );
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186 peer->p_exp_timer.tv_sec += peer->p_hdr.info.config.pic_lft;
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187
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188 /* add to the expiry list in appropriate position (probably around the end) */
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189 for (li = exp_list.prev; li != &exp_list; li = li->prev) {
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190 struct fd_peer * p = (struct fd_peer *)(li->o);
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191 if (TS_IS_INFERIOR( &p->p_exp_timer, &peer->p_exp_timer ) )
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192 break;
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193 }
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194
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195 fd_list_insert_after(li, &peer->p_expiry);
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196
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197 /* signal the expiry thread if we added in first position */
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198 if (li == &exp_list) {
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199 CHECK_POSIX( pthread_cond_signal(&exp_cnd) );
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200 }
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201 }
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202
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203 CHECK_POSIX( pthread_mutex_unlock(&exp_mtx) );
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204 return 0;
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205 }
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206
"Welcome to our mercurial repository"