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annotate extensions/rt_redirect/redir_expiry.c @ 1281:ab6457399be2 1.2.1-rc1

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Updated copyright information
author Sebastien Decugis <sdecugis@freediameter.net>
date Sat, 03 Jan 2015 02:23:28 +0800
parents 25fad6714991
children
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1 /*********************************************************************************************************
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2 * Software License Agreement (BSD License) *
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3 * Author: Sebastien Decugis <sdecugis@freediameter.net> *
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4 * *
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5 * Copyright (c) 2015, 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 "rt_redir.h"
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38 /* Expiration management */
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41 /* Entries by their ascending expiration date, to accelerate the work of the expire thread */
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42 static struct fd_list expire_list = FD_LIST_INITIALIZER(expire_list);
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43 static pthread_cond_t exp_cnd = PTHREAD_COND_INITIALIZER;
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45 pthread_mutex_t redir_exp_peer_lock = PTHREAD_MUTEX_INITIALIZER;
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47 /* The thread that handles expired entries cleanup. */
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48 void * redir_exp_thr_fct(void * arg)
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49 {
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50 fd_log_threadname ( "Redirects/expire" );
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51 TRACE_ENTRY( "" );
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53 CHECK_POSIX_DO( pthread_mutex_lock(&redir_exp_peer_lock), goto fatal_error );
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54 pthread_cleanup_push( fd_cleanup_mutex, &redir_exp_peer_lock );
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55
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56 do {
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57 struct timespec now;
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58 struct redir_entry * first;
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59 again:
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60 /* Check if there are expiring entries available */
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61 if (FD_IS_LIST_EMPTY(&expire_list)) {
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62 /* Just wait for a change or cancelation */
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63 CHECK_POSIX_DO( pthread_cond_wait( &exp_cnd, &redir_exp_peer_lock ), break /* this might not pop the cleanup handler, but since we ASSERT(0), it is not the big issue... */ );
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64 /* Restart the loop on wakeup */
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65 goto again;
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66 }
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67
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68 /* Get the pointer to the entry that expires first */
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69 first = (struct redir_entry *)(expire_list.next->o);
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70
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71 /* Get the current time */
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72 CHECK_SYS_DO( clock_gettime(CLOCK_REALTIME, &now), break );
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74 /* If first session is not expired, we just wait until it happens */
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75 if ( TS_IS_INFERIOR( &now, &first->timeout ) ) {
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76
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77 CHECK_POSIX_DO2( pthread_cond_timedwait( &exp_cnd, &redir_exp_peer_lock, &first->timeout ),
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78 ETIMEDOUT, /* ETIMEDOUT is a normal error, continue */,
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79 /* on other error, */ break );
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80
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81 /* on wakeup, loop */
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82 goto again;
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83 }
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84
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85 /* Now, the first entry in the list is expired; destroy it */
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87 CHECK_FCT_DO( redir_entry_destroy( first ), break );
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88
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89 } while (1);
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90
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91 pthread_cleanup_pop( 0 );
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92 CHECK_POSIX_DO( pthread_mutex_unlock(&redir_exp_peer_lock), );
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93
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94 fatal_error:
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95 TRACE_DEBUG(INFO, "A system error occurred in redirect module! Expiry thread is terminating...");
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96 ASSERT(0);
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97 return NULL;
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98 }
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99
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100 /* Sets the timeout value & link in expiry list. The mutex must be held on calling */
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101 int redir_exp_set(struct redir_entry * e, uint32_t duration)
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102 {
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103 struct fd_list * li;
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104 TRACE_ENTRY("%p %d", e, duration);
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105 CHECK_PARAMS(e && (e->eyec == REDIR_ENTRY_EYEC) && duration );
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106
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107 /* Unlink in case it was already set before */
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108 fd_list_unlink(&e->exp_list);
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109
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110 /* Get current time */
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111 CHECK_SYS( clock_gettime(CLOCK_REALTIME, &e->timeout) );
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112
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113 /* Add the duration */
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114 e->timeout.tv_sec += duration;
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115
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116 /* now search the next element in the list */
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117 for (li = expire_list.next; li != &expire_list; li = li->next) {
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118 struct redir_entry * n = li->o;
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119
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120 if ( TS_IS_INFERIOR( &e->timeout, &n->timeout ) )
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121 break;
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122
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123 }
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124
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125 /* Insert before this element */
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126 fd_list_insert_before(li, &e->exp_list);
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127
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128 /* Signal the expiry thread if needed */
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129 if (e->exp_list.prev == &expire_list) { /* it is the first element */
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130 CHECK_POSIX( pthread_cond_signal(&exp_cnd) );
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131 }
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132
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133 /* Done */
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134 return 0;
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135 }
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136
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