annotate libfdcore/p_out.c @ 1010:357c2f892d24

Implement a new counter on pending answers to send back to a peer. Function fd_peer_get_load_pending updated to retrieve this counter as well. When a peer has answers pending, the connection is not immediately teared down upon DPR/DPA exchange, but a GRACE_TIMEOUT delay (default 1 sec) is granted.
author Sebastien Decugis <sdecugis@freediameter.net>
date Mon, 25 Mar 2013 16:39:32 +0100
parents 5c564966a754
children 0117a7746b21
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@freediameter.net> *
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4 * *
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5 * Copyright (c) 2013, 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
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38 /* Alloc a new hbh for requests, bufferize the message and send on the connection, save in sentreq if provided */
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39 static int do_send(struct msg ** msg, uint32_t flags, struct cnxctx * cnx, uint32_t * hbh, struct sr_list * srl)
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40 {
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41 struct msg_hdr * hdr;
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42 int msg_is_a_req;
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43 uint8_t * buf;
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44 size_t sz;
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45 int ret;
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46 uint32_t bkp_hbh = 0;
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47 struct timespec senton;
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48 struct msg * cpy_for_logs_only;
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49
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50 TRACE_ENTRY("%p %x %p %p %p", msg, flags, cnx, hbh, srl);
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51
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52 /* Retrieve the message header */
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53 CHECK_FCT( fd_msg_hdr(*msg, &hdr) );
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54
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55 msg_is_a_req = (hdr->msg_flags & CMD_FLAG_REQUEST);
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56 if (msg_is_a_req) {
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57 CHECK_PARAMS(hbh && srl);
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58 /* Alloc the hop-by-hop id and increment the value for next message */
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59 bkp_hbh = hdr->msg_hbhid;
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60 hdr->msg_hbhid = *hbh;
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61 *hbh = hdr->msg_hbhid + 1;
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62 }
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63
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64 /* Create the message buffer */
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65 CHECK_FCT(fd_msg_bufferize( *msg, &buf, &sz ));
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66 pthread_cleanup_push( free, buf );
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67
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68 cpy_for_logs_only = *msg;
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69
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70 /* Save a request before sending so that there is no race condition with the answer */
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71 if (msg_is_a_req) {
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72 CHECK_FCT_DO( ret = fd_p_sr_store(srl, msg, &hdr->msg_hbhid, bkp_hbh), goto out );
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73 }
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74
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75 CHECK_SYS_DO( clock_gettime(CLOCK_REALTIME, &senton), /* ... */ );
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76 CHECK_FCT_DO( fd_msg_ts_set_sent(cpy_for_logs_only, &senton), /* ... */ );
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77
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78 /* Log the message */
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79 fd_msg_log( FD_MSG_LOG_SENT, cpy_for_logs_only, "Sent to '%s'", fd_cnx_getid(cnx));
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80
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81 {
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82 struct timespec rcvon, delay;
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83
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84 (void) fd_msg_ts_get_recv(cpy_for_logs_only, &rcvon);
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85 if (rcvon.tv_sec != 0 || rcvon.tv_nsec != 0) {
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86 TS_DIFFERENCE( &delay, &rcvon, &senton);
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87 fd_msg_log( FD_MSG_LOG_TIMING, cpy_for_logs_only, "Forwarded in %d.%06.6d sec", delay.tv_sec, delay.tv_nsec/1000);
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88 } else { /* We log the answer time only for answers generated locally */
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89 if (!msg_is_a_req) {
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90 /* get the matching request */
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91 struct msg * req;
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92 struct timespec reqrcvon;
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93 (void) fd_msg_answ_getq(cpy_for_logs_only, &req);
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94 (void) fd_msg_ts_get_recv(req, &reqrcvon);
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95 TS_DIFFERENCE( &delay, &reqrcvon, &senton);
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96 fd_msg_log( FD_MSG_LOG_TIMING, cpy_for_logs_only, "Answered in %d.%06.6d sec", delay.tv_sec, delay.tv_nsec/1000);
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97 }
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98 }
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99 }
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100
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101 /* Send the message */
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102 CHECK_FCT_DO( ret = fd_cnx_send(cnx, buf, sz, flags), );
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103 out:
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104 ;
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105 pthread_cleanup_pop(1);
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106
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107 if (ret)
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108 return ret;
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109
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110 /* Free remaining messages (i.e. answers) */
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111 if (*msg) {
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112 CHECK_FCT( fd_msg_free(*msg) );
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113 *msg = NULL;
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114 }
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115
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116 return 0;
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117 }
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diff changeset
118
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diff changeset
119 static void cleanup_requeue(void * arg)
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diff changeset
120 {
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diff changeset
121 struct msg *msg = arg;
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122 CHECK_FCT_DO(fd_fifo_post(fd_g_outgoing, &msg),
688
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diff changeset
123 {
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diff changeset
124 fd_msg_log( FD_MSG_LOG_DROPPED, msg, "An error occurred while attempting to requeue this message during cancellation of the sending function");
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125 CHECK_FCT_DO(fd_msg_free(msg), /* What can we do more? */);
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parents: 662
diff changeset
126 } );
33
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127 }
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diff changeset
128
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129 /* The code of the "out" thread */
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130 static void * out_thr(void * arg)
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131 {
34
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diff changeset
132 struct fd_peer * peer = arg;
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133 ASSERT( CHECK_PEER(peer) );
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134
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135 /* Set the thread name */
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136 {
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diff changeset
137 char buf[48];
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138 snprintf(buf, sizeof(buf), "OUT/%s", peer->p_hdr.info.pi_diamid);
34
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139 fd_log_threadname ( buf );
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140 }
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141
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142 /* Loop until cancelation */
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143 while (1) {
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144 struct msg * msg;
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145 int ret;
34
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146
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147 /* Retrieve next message to send */
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148 CHECK_FCT_DO( fd_fifo_get(peer->p_tosend, &msg), goto error );
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149
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150 /* Now if we are cancelled, we requeue this message */
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151 pthread_cleanup_push(cleanup_requeue, msg);
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152
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153 /* Send the message, log any error */
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154 CHECK_FCT_DO( ret = do_send(&msg, 0, peer->p_cnxctx, &peer->p_hbh, &peer->p_sr),
34
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155 {
455
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156 if (msg) {
975
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Thomas Klausner <tk@giga.or.at>
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157 fd_msg_log( FD_MSG_LOG_DROPPED, msg, "Internal error: Problem while sending (%s)", strerror(ret) );
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158 fd_msg_free(msg);
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159 }
34
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160 } );
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161
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162 /* Loop */
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163 pthread_cleanup_pop(0);
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164 }
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165
33
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166 error:
34
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167 /* It is not really a connection error, but the effect is the same, we are not able to send anymore message */
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168 CHECK_FCT_DO( fd_event_send(peer->p_events, FDEVP_CNX_ERROR, 0, NULL), /* What do we do if it fails? */ );
33
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169 return NULL;
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170 }
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171
229
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172 /* Wrapper to sending a message either by out thread (peer in OPEN state) or directly; cnx or peer must be provided. Flags are valid only for direct sending, not through thread (unused) */
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173 int fd_out_send(struct msg ** msg, struct cnxctx * cnx, struct fd_peer * peer, uint32_t flags)
33
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174 {
1010
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175 struct msg_hdr * hdr;
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176
229
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177 TRACE_ENTRY("%p %p %p %x", msg, cnx, peer, flags);
33
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178 CHECK_PARAMS( msg && *msg && (cnx || (peer && peer->p_cnxctx)));
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179
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180 if (peer) {
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181 CHECK_FCT( fd_msg_hdr(*msg, &hdr) );
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182 if (!(hdr->msg_flags & CMD_FLAG_REQUEST)) {
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183 /* Update the count of pending answers to send */
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184 CHECK_POSIX( pthread_mutex_lock(&peer->p_state_mtx) );
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185 peer->p_reqin_count--;
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186 CHECK_POSIX( pthread_mutex_unlock(&peer->p_state_mtx) );
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187 }
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188 }
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189
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diff changeset
190 if (fd_peer_getstate(peer) == STATE_OPEN) {
33
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191 /* Normal case: just queue for the out thread to pick it up */
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192 CHECK_FCT( fd_fifo_post(peer->p_tosend, msg) );
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193
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194 } else {
688
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195 int ret;
33
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196 uint32_t *hbh = NULL;
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197
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198 /* In other cases, the thread is not running, so we handle the sending directly */
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199 if (peer)
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200 hbh = &peer->p_hbh;
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diff changeset
201
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Sebastien Decugis <sdecugis@nict.go.jp>
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diff changeset
202 if (!cnx)
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Sebastien Decugis <sdecugis@nict.go.jp>
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diff changeset
203 cnx = peer->p_cnxctx;
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204
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diff changeset
205 /* Do send the message */
688
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diff changeset
206 CHECK_FCT_DO( ret = do_send(msg, flags, cnx, hbh, peer ? &peer->p_sr : NULL),
35
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diff changeset
207 {
455
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diff changeset
208 if (msg) {
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5c564966a754 Remove \n from fd_msg_log.
Thomas Klausner <tk@giga.or.at>
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diff changeset
209 fd_msg_log( FD_MSG_LOG_DROPPED, *msg, "Internal error: Problem while sending (%s)", strerror(ret) );
455
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diff changeset
210 fd_msg_free(*msg);
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diff changeset
211 *msg = NULL;
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diff changeset
212 }
35
6486e97f56ae Added test for modified message parsing
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parents: 34
diff changeset
213 } );
33
e6fcdf12b9a0 Added a lot of TODOs :)
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diff changeset
214 }
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parents:
diff changeset
215
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diff changeset
216 return 0;
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parents:
diff changeset
217 }
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parents:
diff changeset
218
e6fcdf12b9a0 Added a lot of TODOs :)
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parents:
diff changeset
219 /* Start the "out" thread that picks messages in p_tosend and send them on p_cnxctx */
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parents:
diff changeset
220 int fd_out_start(struct fd_peer * peer)
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Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
221 {
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Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
222 TRACE_ENTRY("%p", peer);
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Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
223 CHECK_PARAMS( CHECK_PEER(peer) && (peer->p_outthr == (pthread_t)NULL) );
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parents:
diff changeset
224
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Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
225 CHECK_POSIX( pthread_create(&peer->p_outthr, NULL, out_thr, peer) );
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parents:
diff changeset
226
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parents:
diff changeset
227 return 0;
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parents:
diff changeset
228 }
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parents:
diff changeset
229
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Sebastien Decugis <sdecugis@nict.go.jp>
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diff changeset
230 /* Stop that thread */
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Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
231 int fd_out_stop(struct fd_peer * peer)
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Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
232 {
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Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
233 TRACE_ENTRY("%p", peer);
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Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
234 CHECK_PARAMS( CHECK_PEER(peer) );
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parents:
diff changeset
235
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Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
236 CHECK_FCT( fd_thr_term(&peer->p_outthr) );
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Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
237
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Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
238 return 0;
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Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
239 }
e6fcdf12b9a0 Added a lot of TODOs :)
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
240
"Welcome to our mercurial repository"