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annotate libfdcore/p_out.c @ 691:78b665400097

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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>
date Thu, 20 Jan 2011 19:44:27 +0900
parents 8c3dc8584dab
children 4ffbc9f1e922
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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
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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
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48 TRACE_ENTRY("%p %x %p %p %p", msg, flags, cnx, hbh, srl);
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49
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50 /* Retrieve the message header */
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51 CHECK_FCT( fd_msg_hdr(*msg, &hdr) );
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52
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53 msg_is_a_req = (hdr->msg_flags & CMD_FLAG_REQUEST);
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54 if (msg_is_a_req) {
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55 CHECK_PARAMS(hbh && srl);
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56 /* Alloc the hop-by-hop id and increment the value for next message */
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57 bkp_hbh = hdr->msg_hbhid;
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58 hdr->msg_hbhid = *hbh;
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59 *hbh = hdr->msg_hbhid + 1;
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60 }
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61
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62 /* Create the message buffer */
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63 CHECK_FCT(fd_msg_bufferize( *msg, &buf, &sz ));
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64 pthread_cleanup_push( free, buf );
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65
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66 /* Log the message */
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67 fd_msg_log( FD_MSG_LOG_SENT, *msg, "Sent to '%s'", fd_cnx_getid(cnx));
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68
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69 /* Save a request before sending so that there is no race condition with the answer */
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70 if (msg_is_a_req) {
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71 CHECK_FCT_DO( ret = fd_p_sr_store(srl, msg, &hdr->msg_hbhid, bkp_hbh), goto out );
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72 }
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73
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74 /* Send the message */
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75 CHECK_FCT_DO( ret = fd_cnx_send(cnx, buf, sz, flags), );
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76 out:
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77 ;
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78 pthread_cleanup_pop(1);
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79
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80 if (ret)
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81 return ret;
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82
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83 /* Free remaining messages (i.e. answers) */
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84 if (*msg) {
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85 CHECK_FCT( fd_msg_free(*msg) );
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86 *msg = NULL;
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87 }
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88
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89 return 0;
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90 }
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91
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92 static void cleanup_requeue(void * arg)
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93 {
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94 struct msg *msg = arg;
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95 CHECK_FCT_DO(fd_fifo_post(fd_g_outgoing, &msg),
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96 {
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97 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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98 CHECK_FCT_DO(fd_msg_free(msg), /* What can we do more? */);
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99 } );
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100 }
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101
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102 /* The code of the "out" thread */
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103 static void * out_thr(void * arg)
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104 {
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105 struct fd_peer * peer = arg;
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106 ASSERT( CHECK_PEER(peer) );
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107
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108 /* Set the thread name */
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109 {
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110 char buf[48];
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111 sprintf(buf, "OUT/%.*s", (int)sizeof(buf) - 5, peer->p_hdr.info.pi_diamid);
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112 fd_log_threadname ( buf );
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113 }
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114
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115 /* Loop until cancelation */
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116 while (1) {
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117 struct msg * msg;
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118 int ret;
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119
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120 /* Retrieve next message to send */
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121 CHECK_FCT_DO( fd_fifo_get(peer->p_tosend, &msg), goto error );
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122
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123 /* Now if we are cancelled, we requeue this message */
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124 pthread_cleanup_push(cleanup_requeue, msg);
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125
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126 /* Send the message, log any error */
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127 CHECK_FCT_DO( ret = do_send(&msg, 0, peer->p_cnxctx, &peer->p_hbh, &peer->p_sr),
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128 {
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129 if (msg) {
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130 fd_msg_log( FD_MSG_LOG_DROPPED, msg, "Internal error: Problem while sending (%s)\n", strerror(ret) );
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131 fd_msg_free(msg);
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132 }
34
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133 } );
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134
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135 /* Loop */
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136 pthread_cleanup_pop(0);
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137 }
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138
33
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139 error:
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140 /* 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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141 CHECK_FCT_DO( fd_event_send(peer->p_events, FDEVP_CNX_ERROR, 0, NULL), /* What do we do if it fails? */ );
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142 return NULL;
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143 }
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144
229
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145 /* 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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146 int fd_out_send(struct msg ** msg, struct cnxctx * cnx, struct fd_peer * peer, uint32_t flags)
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147 {
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148 TRACE_ENTRY("%p %p %p %x", msg, cnx, peer, flags);
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149 CHECK_PARAMS( msg && *msg && (cnx || (peer && peer->p_cnxctx)));
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150
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151 fd_cpu_flush_cache();
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152 if (peer && (peer->p_hdr.info.runtime.pir_state == STATE_OPEN)) {
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153 /* Normal case: just queue for the out thread to pick it up */
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154 CHECK_FCT( fd_fifo_post(peer->p_tosend, msg) );
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155
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156 } else {
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157 int ret;
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158 uint32_t *hbh = NULL;
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159
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160 /* In other cases, the thread is not running, so we handle the sending directly */
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161 if (peer)
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162 hbh = &peer->p_hbh;
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163
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164 if (!cnx)
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165 cnx = peer->p_cnxctx;
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166
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167 /* Do send the message */
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168 CHECK_FCT_DO( ret = do_send(msg, flags, cnx, hbh, peer ? &peer->p_sr : NULL),
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169 {
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170 if (msg) {
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171 fd_msg_log( FD_MSG_LOG_DROPPED, *msg, "Internal error: Problem while sending (%s)\n", strerror(ret) );
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172 fd_msg_free(*msg);
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173 *msg = NULL;
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174 }
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175 } );
33
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176 }
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177
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178 return 0;
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179 }
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180
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181 /* Start the "out" thread that picks messages in p_tosend and send them on p_cnxctx */
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182 int fd_out_start(struct fd_peer * peer)
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183 {
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184 TRACE_ENTRY("%p", peer);
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185 CHECK_PARAMS( CHECK_PEER(peer) && (peer->p_outthr == (pthread_t)NULL) );
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186
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187 CHECK_POSIX( pthread_create(&peer->p_outthr, NULL, out_thr, peer) );
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188
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189 return 0;
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190 }
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191
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192 /* Stop that thread */
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193 int fd_out_stop(struct fd_peer * peer)
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194 {
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195 TRACE_ENTRY("%p", peer);
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196 CHECK_PARAMS( CHECK_PEER(peer) );
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197
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198 CHECK_FCT( fd_thr_term(&peer->p_outthr) );
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199
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200 return 0;
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201 }
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202
"Welcome to our mercurial repository"