Mercurial > hg > freeDiameter
annotate libfdcore/p_sr.c @ 691:78b665400097
Cleanup all pthread_cleanup_push / pop pairs so that pop is always called after push, or ASSERT(0) is some grave errors
author | Sebastien Decugis <sdecugis@nict.go.jp> |
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date | Thu, 20 Jan 2011 19:44:27 +0900 |
parents | 8c3dc8584dab |
children | 4ffbc9f1e922 |
rev | line source |
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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) 2011, 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 "fdcore-internal.h" |
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37 |
74 | 38 #ifndef SR_DEBUG_LVL |
39 #define SR_DEBUG_LVL ANNOYING | |
40 #endif /* SR_DEBUG_LVL */ | |
41 | |
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42 /* Structure to store a sent request */ |
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43 struct sentreq { |
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44 struct fd_list chain; /* the "o" field points directly to the hop-by-hop of the request (uint32_t *) */ |
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45 struct msg *req; /* A request that was sent and not yet answered. */ |
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46 uint32_t prevhbh;/* The value to set in the hbh header when the message is retrieved */ |
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47 struct fd_list expire; /* the list of expiring requests */ |
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48 struct timespec added_on; /* the time the request was added */ |
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49 }; |
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50 |
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51 /* Find an element in the hbh list, or the following one */ |
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52 static struct fd_list * find_or_next(struct fd_list * srlist, uint32_t hbh, int * match) |
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53 { |
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54 struct fd_list * li; |
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55 *match = 0; |
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56 for (li = srlist->next; li != srlist; li = li->next) { |
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57 uint32_t * nexthbh = li->o; |
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58 if (*nexthbh < hbh) |
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59 continue; |
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60 if (*nexthbh == hbh) |
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61 *match = 1; |
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62 break; |
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63 } |
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64 return li; |
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65 } |
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66 |
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67 static void srl_dump(const char * text, struct fd_list * srlist) |
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68 { |
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69 struct fd_list * li; |
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70 struct timespec now; |
74 | 71 if (!TRACE_BOOL(SR_DEBUG_LVL)) |
73 | 72 return; |
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73 CHECK_SYS_DO( clock_gettime(CLOCK_REALTIME, &now), ); |
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74 fd_log_debug("%sSentReq list @%p:\n", text, srlist); |
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75 for (li = srlist->next; li != srlist; li = li->next) { |
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76 struct sentreq * sr = (struct sentreq *)li; |
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77 uint32_t * nexthbh = li->o; |
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78 fd_log_debug(" - Next req (%x): [since %ld.%06ld sec]\n", *nexthbh, |
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79 (now.tv_nsec >= sr->added_on.tv_nsec) ? (now.tv_sec - sr->added_on.tv_sec) : (now.tv_sec - sr->added_on.tv_sec - 1), |
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80 (now.tv_nsec >= sr->added_on.tv_nsec) ? (now.tv_nsec - sr->added_on.tv_nsec) / 1000 : (now.tv_nsec - sr->added_on.tv_nsec + 1000000000) / 1000); |
74 | 81 fd_msg_dump_one(SR_DEBUG_LVL + 1, sr->req); |
71
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82 } |
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83 } |
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84 |
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85 /* (detached) thread that calls the anscb on expired messages. |
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86 We do it in a separate thread to avoid blocking the reception of new messages during this time */ |
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87 static void * call_anscb_expire(void * arg) { |
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88 struct msg * expired_req = arg; |
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89 |
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90 void (*anscb)(void *, struct msg **); |
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91 void * data; |
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92 |
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93 TRACE_ENTRY("%p", arg); |
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94 CHECK_PARAMS_DO( arg, return NULL ); |
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95 |
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96 /* Set the thread name */ |
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97 fd_log_threadname ( "Expired req cb." ); |
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98 |
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99 /* Log */ |
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100 TRACE_DEBUG(INFO, "The expiration timer for a request has been reached, abording this attempt now & calling cb..."); |
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101 |
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102 /* Retrieve callback in the message */ |
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103 CHECK_FCT_DO( fd_msg_anscb_get( expired_req, &anscb, &data ), return NULL); |
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104 ASSERT(anscb); |
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105 |
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106 /* Call it */ |
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107 (*anscb)(data, &expired_req); |
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108 |
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109 /* If the callback did not dispose of the message, do it now */ |
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110 if (expired_req) { |
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111 fd_msg_log(FD_MSG_LOG_DROPPED, expired_req, "Expiration period completed without an answer, and the expiry callback did not dispose of the message."); |
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112 CHECK_FCT_DO( fd_msg_free(expired_req), /* ignore */ ); |
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113 } |
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114 |
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115 /* Finish */ |
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116 return NULL; |
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117 } |
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118 |
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119 /* thread that handles messages expiring. The thread is started / cancelled only when needed */ |
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120 static void * sr_expiry_th(void * arg) { |
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121 struct sr_list * srlist = arg; |
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122 struct msg * expired_req; |
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123 pthread_attr_t detached; |
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124 |
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125 TRACE_ENTRY("%p", arg); |
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126 CHECK_PARAMS_DO( arg, return NULL ); |
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127 |
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128 /* Set the thread name */ |
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129 { |
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130 char buf[48]; |
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131 sprintf(buf, "ReqExp/%.*s", (int)sizeof(buf) - 8, ((struct fd_peer *)(srlist->exp.o))->p_hdr.info.pi_diamid); |
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132 fd_log_threadname ( buf ); |
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133 } |
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134 |
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135 CHECK_POSIX_DO( pthread_attr_init(&detached), return NULL ); |
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136 CHECK_POSIX_DO( pthread_attr_setdetachstate(&detached, PTHREAD_CREATE_DETACHED), return NULL ); |
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137 |
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138 CHECK_POSIX_DO( pthread_mutex_lock(&srlist->mtx), return NULL ); |
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139 pthread_cleanup_push( fd_cleanup_mutex, &srlist->mtx ); |
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140 |
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141 do { |
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142 struct timespec now, *t; |
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143 struct sentreq * first; |
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144 pthread_t th; |
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145 |
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146 /* Check if there are expiring requests available */ |
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147 if (FD_IS_LIST_EMPTY(&srlist->exp)) { |
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148 /* Just wait for a change or cancelation */ |
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149 CHECK_POSIX_DO( pthread_cond_wait( &srlist->cnd, &srlist->mtx ), goto error ); |
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150 /* Restart the loop on wakeup */ |
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151 continue; |
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152 } |
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153 |
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154 /* Get the pointer to the request that expires first */ |
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155 first = (struct sentreq *)(srlist->exp.next->o); |
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156 t = fd_msg_anscb_gettimeout( first->req ); |
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157 ASSERT(t); |
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158 |
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159 /* Get the current time */ |
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160 CHECK_SYS_DO( clock_gettime(CLOCK_REALTIME, &now), goto error ); |
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161 |
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162 /* If first request is not expired, we just wait until it happens */ |
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163 if ( TS_IS_INFERIOR( &now, t ) ) { |
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164 |
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165 CHECK_POSIX_DO2( pthread_cond_timedwait( &srlist->cnd, &srlist->mtx, t ), |
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166 ETIMEDOUT, /* ETIMEDOUT is a normal return value, continue */, |
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167 /* on other error, */ goto error ); |
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168 |
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169 /* on wakeup, loop */ |
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170 continue; |
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171 } |
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172 |
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173 /* Now, the first request in the list is expired; remove it and call the anscb for it in a new thread */ |
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174 fd_list_unlink(&first->chain); |
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175 fd_list_unlink(&first->expire); |
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176 expired_req = first->req; |
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177 free(first); |
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178 |
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179 CHECK_POSIX_DO( pthread_create( &th, &detached, call_anscb_expire, expired_req ), goto error ); |
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180 |
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181 /* loop */ |
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182 } while (1); |
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183 error: |
650
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Fix compilation warning
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184 ; /* pthread_cleanup_pop sometimes expands as "} ..." and the label beofre this cause some compilers to complain... */ |
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185 pthread_cleanup_pop( 1 ); |
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186 ASSERT(0); /* we have encountered a problem, maybe time to signal the framework to terminate? */ |
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187 return NULL; |
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188 } |
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189 |
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190 |
34
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191 /* Store a new sent request */ |
165
4679ff581d6a
Fix invalid restore of the hop-by-hop id on forwarded answers
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192 int fd_p_sr_store(struct sr_list * srlist, struct msg **req, uint32_t *hbhloc, uint32_t hbh_restore) |
34
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193 { |
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194 struct sentreq * sr; |
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195 struct fd_list * next; |
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196 int match; |
649
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197 struct timespec * ts; |
34
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198 |
165
4679ff581d6a
Fix invalid restore of the hop-by-hop id on forwarded answers
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199 TRACE_ENTRY("%p %p %p %x", srlist, req, hbhloc, hbh_restore); |
34
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200 CHECK_PARAMS(srlist && req && *req && hbhloc); |
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201 |
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202 CHECK_MALLOC( sr = malloc(sizeof(struct sentreq)) ); |
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203 memset(sr, 0, sizeof(struct sentreq)); |
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204 fd_list_init(&sr->chain, hbhloc); |
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205 sr->req = *req; |
165
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206 sr->prevhbh = hbh_restore; |
649
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207 fd_list_init(&sr->expire, sr); |
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208 CHECK_SYS( clock_gettime(CLOCK_REALTIME, &sr->added_on) ); |
34
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209 |
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210 /* Search the place in the list */ |
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211 CHECK_POSIX( pthread_mutex_lock(&srlist->mtx) ); |
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212 next = find_or_next(&srlist->srs, *hbhloc, &match); |
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213 if (match) { |
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214 TRACE_DEBUG(INFO, "A request with the same hop-by-hop Id was already sent: error"); |
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215 free(sr); |
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216 CHECK_POSIX_DO( pthread_mutex_unlock(&srlist->mtx), /* ignore */ ); |
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217 return EINVAL; |
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218 } |
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219 |
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220 /* Save in the list */ |
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221 *req = NULL; |
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222 fd_list_insert_before(next, &sr->chain); |
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223 srl_dump("Saved new request, ", &srlist->srs); |
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224 |
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225 /* In case of request with a timeout, also store in the timeout list */ |
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226 ts = fd_msg_anscb_gettimeout( sr->req ); |
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227 if (ts) { |
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228 struct fd_list * li; |
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229 struct timespec * t; |
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230 |
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231 /* browse srlist->exp from the end */ |
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232 for (li = srlist->exp.prev; li != &srlist->exp; li = li->prev) { |
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233 struct sentreq * s = (struct sentreq *)(li->o); |
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234 t = fd_msg_anscb_gettimeout( s->req ); |
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235 ASSERT( t ); /* sanity */ |
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236 if (TS_IS_INFERIOR(t, ts)) |
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237 break; |
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238 } |
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239 |
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240 fd_list_insert_after(li, &sr->expire); |
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241 |
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242 /* if the thread does not exist yet, create it */ |
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243 if (srlist->thr == (pthread_t)NULL) { |
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244 CHECK_POSIX_DO( pthread_create(&srlist->thr, NULL, sr_expiry_th, srlist), /* continue anyway */); |
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245 } else { |
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246 /* or, if added in first position, signal the condvar to update the sleep time of the thread */ |
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247 if (li == &srlist->exp) { |
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248 CHECK_POSIX_DO( pthread_cond_signal(&srlist->cnd), /* continue anyway */); |
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249 } |
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250 } |
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251 } |
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252 |
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253 CHECK_POSIX( pthread_mutex_unlock(&srlist->mtx) ); |
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254 return 0; |
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255 } |
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256 |
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257 /* Fetch a request by hbh */ |
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258 int fd_p_sr_fetch(struct sr_list * srlist, uint32_t hbh, struct msg **req) |
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259 { |
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260 struct sentreq * sr; |
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261 int match; |
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262 |
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263 TRACE_ENTRY("%p %x %p", srlist, hbh, req); |
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264 CHECK_PARAMS(srlist && req); |
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265 |
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266 /* Search the request in the list */ |
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267 CHECK_POSIX( pthread_mutex_lock(&srlist->mtx) ); |
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268 srl_dump("Fetching a request, ", &srlist->srs); |
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269 sr = (struct sentreq *)find_or_next(&srlist->srs, hbh, &match); |
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270 if (!match) { |
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271 TRACE_DEBUG(INFO, "There is no saved request with this hop-by-hop id (%x)", hbh); |
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272 *req = NULL; |
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273 } else { |
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274 /* Restore hop-by-hop id */ |
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275 *((uint32_t *)sr->chain.o) = sr->prevhbh; |
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276 /* Unlink */ |
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277 fd_list_unlink(&sr->chain); |
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278 fd_list_unlink(&sr->expire); |
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279 *req = sr->req; |
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280 free(sr); |
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281 } |
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282 CHECK_POSIX( pthread_mutex_unlock(&srlist->mtx) ); |
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283 |
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284 /* do not stop the expire thread here, it might cause creating/destroying it very often otherwise */ |
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285 |
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286 /* Done */ |
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287 return 0; |
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288 } |
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289 |
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290 /* Failover requests (free or requeue routables) */ |
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291 void fd_p_sr_failover(struct sr_list * srlist) |
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292 { |
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293 CHECK_POSIX_DO( pthread_mutex_lock(&srlist->mtx), /* continue anyway */ ); |
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294 while (!FD_IS_LIST_EMPTY(&srlist->srs)) { |
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295 struct sentreq * sr = (struct sentreq *)(srlist->srs.next); |
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296 fd_list_unlink(&sr->chain); |
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297 fd_list_unlink(&sr->expire); |
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298 if (fd_msg_is_routable(sr->req)) { |
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299 struct msg_hdr * hdr = NULL; |
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300 int ret; |
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301 |
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302 /* Set the 'T' flag */ |
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303 CHECK_FCT_DO(fd_msg_hdr(sr->req, &hdr), /* continue */); |
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304 if (hdr) |
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305 hdr->msg_flags |= CMD_FLAG_RETRANSMIT; |
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306 |
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307 /* Requeue for sending to another peer */ |
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308 CHECK_FCT_DO( ret = fd_fifo_post(fd_g_outgoing, &sr->req), |
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309 { |
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310 fd_msg_log( FD_MSG_LOG_DROPPED, sr->req, "Internal error: error while requeuing during failover: %s", strerror(ret) ); |
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311 CHECK_FCT_DO(fd_msg_free(sr->req), /* What can we do more? */) |
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312 }); |
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313 } else { |
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314 /* Just free the request. */ |
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315 fd_msg_log( FD_MSG_LOG_DROPPED, sr->req, "Local message discarded during failover" ); |
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316 CHECK_FCT_DO(fd_msg_free(sr->req), /* Ignore */); |
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317 } |
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318 free(sr); |
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319 } |
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320 /* The list of expiring requests must be empty now */ |
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321 ASSERT( FD_IS_LIST_EMPTY(&srlist->exp) ); |
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322 |
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323 CHECK_POSIX_DO( pthread_mutex_unlock(&srlist->mtx), /* continue anyway */ ); |
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324 |
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325 /* Terminate the expiry thread (must be done when the lock can be taken) */ |
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326 CHECK_FCT_DO( fd_thr_term(&srlist->thr), /* ignore error */ ); |
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327 } |
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328 |