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annotate freeDiameter/p_expiry.c @ 14:14cf6daf716d

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Some progress on peers module
author Sebastien Decugis <sdecugis@nict.go.jp>
date Thu, 01 Oct 2009 18:24:07 +0900
parents ef9ef3bf4752
children 013ce9851131
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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
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38 static pthread_t exp_thr;
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39 static struct fd_list exp_list = FD_LIST_INITIALIZER( exp_list );
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40 static pthread_cond_t exp_cnd = PTHREAD_COND_INITIALIZER;
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41 static pthread_mutex_t exp_mtx = PTHREAD_MUTEX_INITIALIZER;
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42
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43 static void * exp_th_fct(void * arg)
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44 {
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45 fd_log_threadname ( "Peers/expire" );
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46 TRACE_ENTRY( "" );
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47
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48 CHECK_POSIX_DO( pthread_mutex_lock(&exp_mtx), goto error );
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49 pthread_cleanup_push( fd_cleanup_mutex, &exp_mtx );
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50
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51 do {
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52 struct timespec now;
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53 struct fd_peer * first;
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54
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55 /* Check if there are expiring sessions available */
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56 if (FD_IS_LIST_EMPTY(&exp_list)) {
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57 /* Just wait for a change or cancelation */
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58 CHECK_POSIX_DO( pthread_cond_wait( &exp_cnd, &exp_mtx ), goto error );
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59 /* Restart the loop on wakeup */
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60 continue;
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61 }
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62
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63 /* Get the pointer to the peer that expires first */
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64 first = (struct fd_peer *)(exp_list.next->o);
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65 ASSERT( CHECK_PEER(first) );
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66
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67 /* Get the current time */
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68 CHECK_SYS_DO( clock_gettime(CLOCK_REALTIME, &now), goto error );
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69
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70 /* If first peer is not expired, we just wait until it happens */
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71 if ( TS_IS_INFERIOR( &now, &first->p_exp_timer ) ) {
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72
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73 CHECK_POSIX_DO2( pthread_cond_timedwait( &exp_cnd, &exp_mtx, &first->p_exp_timer ),
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74 ETIMEDOUT, /* ETIMEDOUT is a normal error, continue */,
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75 /* on other error, */ goto error );
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76
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77 /* on wakeup, loop */
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78 continue;
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79 }
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80
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81 /* Now, the first peer in the list is expired; signal it */
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82 fd_list_unlink( &first->p_expiry );
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83 CHECK_FCT_DO( fd_event_send(first->p_events, FDEVP_TERMINATE, NULL), goto error );
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84
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85 } while (1);
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86
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87 pthread_cleanup_pop( 1 );
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88 error:
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89 TRACE_DEBUG(INFO, "An error occurred in peers module! Expiry thread is terminating...");
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90 ASSERT(0);
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91 CHECK_FCT_DO(fd_event_send(fd_g_config->cnf_main_ev, FDEV_TERMINATE, NULL), );
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92 return NULL;
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93 }
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94
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95 /* Initialize peers expiry mechanism */
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96 int fd_p_expi_init(void)
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97 {
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98 TRACE_ENTRY();
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99 CHECK_FCT( pthread_create( &exp_thr, NULL, exp_th_fct, NULL ) );
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100 return 0;
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101 }
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102
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103 /* Finish peers expiry mechanism */
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104 int fd_p_expi_fini(void)
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105 {
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106 CHECK_FCT_DO( fd_thr_term(&exp_thr), );
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107 CHECK_POSIX( pthread_mutex_lock(&exp_mtx) );
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108
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109 while (!FD_IS_LIST_EMPTY(&exp_list)) {
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110 struct fd_peer * peer = (struct fd_peer *)(exp_list.next->o);
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111 fd_list_unlink(&peer->p_expiry );
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112 }
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113
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114 CHECK_POSIX( pthread_mutex_unlock(&exp_mtx) );
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115 return 0;
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116 }
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117
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118 /* Add / requeue a peer in the expiry list */
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119 int fd_p_expi_update(struct fd_peer * peer )
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120 {
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121 TRACE_ENTRY("%p", peer);
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122 CHECK_PARAMS( CHECK_PEER(peer) );
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123
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124 CHECK_POSIX( pthread_mutex_lock(&exp_mtx) );
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125
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126 fd_list_unlink(&peer->p_expiry );
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127
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128 /* if peer expires */
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129 if (peer->p_hdr.info.pi_flags.exp) {
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130 struct fd_list * li;
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131
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132 /* update the p_exp_timer value */
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133 CHECK_SYS( clock_gettime(CLOCK_REALTIME, &peer->p_exp_timer) );
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134 peer->p_exp_timer.tv_sec += peer->p_hdr.info.pi_lft;
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135
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136 /* add to the expiry list in appropriate position (probably around the end) */
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137 for (li = exp_list.prev; li != &exp_list; li = li->prev) {
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138 struct fd_peer * p = (struct fd_peer *)(li->o);
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139 if (TS_IS_INFERIOR( &p->p_exp_timer, &peer->p_exp_timer ) )
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140 break;
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141 }
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142
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143 fd_list_insert_after(li, &peer->p_expiry);
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144
13
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145 /* signal the expiry thread if we added in first position */
14
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146 if (li == &exp_list) {
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147 CHECK_POSIX( pthread_cond_signal(&exp_cnd) );
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148 }
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149 }
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150
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151 CHECK_POSIX( pthread_mutex_unlock(&exp_mtx) );
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152 return 0;
13
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153 }
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154
"Welcome to our mercurial repository"