Mercurial > hg > freeDiameter
annotate freeDiameter/p_out.c @ 72:57ffd98dbe96
Fix race condition
author | Sebastien Decugis <sdecugis@nict.go.jp> |
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date | Tue, 01 Dec 2009 11:34:00 +0900 |
parents | 442f9cf1c704 |
children | eaa5205091d4 |
rev | line source |
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33
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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 /* 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, 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 |
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47 TRACE_ENTRY("%p %p %p %p", msg, cnx, hbh, srl); |
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48 |
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49 /* Retrieve the message header */ |
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50 CHECK_FCT( fd_msg_hdr(*msg, &hdr) ); |
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51 |
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52 msg_is_a_req = (hdr->msg_flags & CMD_FLAG_REQUEST); |
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53 if (msg_is_a_req) { |
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54 CHECK_PARAMS(hbh && srl); |
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55 /* Alloc the hop-by-hop id and increment the value for next message */ |
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56 hdr->msg_hbhid = *hbh; |
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57 *hbh = hdr->msg_hbhid + 1; |
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58 } |
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59 |
61
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60 /* Log the message */ |
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61 if (TRACE_BOOL(FULL)) { |
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62 TRACE_DEBUG(FULL, "Sending the following message on connection '%s':", fd_cnx_getid(cnx)); |
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63 fd_msg_dump_walk(FULL, *msg); |
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64 } |
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65 |
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66 /* Create the message buffer */ |
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67 CHECK_FCT(fd_msg_bufferize( *msg, &buf, &sz )); |
72 | 68 pthread_cleanup_push( free, buf ); |
69 | |
70 /* Save a request before sending so that there is no race condition with the answer */ | |
71 if (msg_is_a_req) { | |
72 CHECK_FCT_DO( ret = fd_p_sr_store(srl, msg, &hdr->msg_hbhid), { free(buf); return ret; } ); | |
73 } | |
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74 |
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75 /* Send the message */ |
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76 CHECK_FCT_DO( ret = fd_cnx_send(cnx, buf, sz), { free(buf); return ret; } ); |
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77 pthread_cleanup_pop(1); |
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78 |
72 | 79 /* Free remaining messages (i.e. answers) */ |
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80 if (*msg) { |
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81 CHECK_FCT( fd_msg_free(*msg) ); |
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82 *msg = NULL; |
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83 } |
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84 |
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85 return 0; |
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86 } |
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87 |
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88 static void cleanup_requeue(void * arg) |
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89 { |
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90 struct msg *msg = arg; |
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91 CHECK_FCT_DO(fd_fifo_post(fd_g_outgoing, &msg), |
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92 CHECK_FCT_DO(fd_msg_free(msg), /* What can we do more? */)); |
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93 } |
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94 |
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95 /* The code of the "out" thread */ |
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96 static void * out_thr(void * arg) |
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97 { |
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98 struct fd_peer * peer = arg; |
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99 ASSERT( CHECK_PEER(peer) ); |
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100 |
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101 /* Set the thread name */ |
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102 { |
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103 char buf[48]; |
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104 sprintf(buf, "OUT/%.*s", sizeof(buf) - 5, peer->p_hdr.info.pi_diamid); |
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105 fd_log_threadname ( buf ); |
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106 } |
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107 |
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108 /* Loop until cancelation */ |
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109 while (1) { |
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110 struct msg * msg; |
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111 |
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112 /* Retrieve next message to send */ |
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113 CHECK_FCT_DO( fd_fifo_get(peer->p_tosend, &msg), goto error ); |
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114 |
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115 /* Now if we are cancelled, we requeue this message */ |
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116 pthread_cleanup_push(cleanup_requeue, msg); |
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117 |
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118 /* Send the message, log any error */ |
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119 CHECK_FCT_DO( do_send(&msg, peer->p_cnxctx, &peer->p_hbh, &peer->p_sr), |
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120 { |
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121 fd_log_debug("An error occurred while sending this message, it is lost:\n"); |
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122 fd_msg_dump_walk(NONE, msg); |
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123 fd_msg_free(msg); |
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124 } ); |
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125 |
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126 /* Loop */ |
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127 pthread_cleanup_pop(0); |
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128 } |
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129 |
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130 error: |
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131 /* 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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132 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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133 return NULL; |
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134 } |
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135 |
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136 /* Wrapper to sending a message either by out thread (peer in OPEN state) or directly; cnx or peer must be provided */ |
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137 int fd_out_send(struct msg ** msg, struct cnxctx * cnx, struct fd_peer * peer) |
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138 { |
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139 TRACE_ENTRY("%p %p %p", msg, cnx, peer); |
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140 CHECK_PARAMS( msg && *msg && (cnx || (peer && peer->p_cnxctx))); |
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141 |
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142 if (peer && (peer->p_hdr.info.runtime.pir_state == STATE_OPEN)) { |
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143 /* Normal case: just queue for the out thread to pick it up */ |
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144 CHECK_FCT( fd_fifo_post(peer->p_tosend, msg) ); |
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145 |
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146 } else { |
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147 uint32_t *hbh = NULL; |
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148 |
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149 /* In other cases, the thread is not running, so we handle the sending directly */ |
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150 if (peer) |
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151 hbh = &peer->p_hbh; |
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152 |
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153 if (!cnx) |
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154 cnx = peer->p_cnxctx; |
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155 |
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156 /* Do send the message */ |
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157 CHECK_FCT_DO( do_send(msg, cnx, hbh, peer ? &peer->p_sr : NULL), |
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158 { |
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159 fd_log_debug("An error occurred while sending this message, it is lost:\n"); |
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160 fd_msg_dump_walk(NONE, *msg); |
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161 fd_msg_free(*msg); |
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162 *msg = NULL; |
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163 } ); |
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164 } |
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165 |
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166 return 0; |
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167 } |
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168 |
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169 /* Start the "out" thread that picks messages in p_tosend and send them on p_cnxctx */ |
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170 int fd_out_start(struct fd_peer * peer) |
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171 { |
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172 TRACE_ENTRY("%p", peer); |
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173 CHECK_PARAMS( CHECK_PEER(peer) && (peer->p_outthr == (pthread_t)NULL) ); |
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174 |
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175 CHECK_POSIX( pthread_create(&peer->p_outthr, NULL, out_thr, peer) ); |
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176 |
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177 return 0; |
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178 } |
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179 |
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180 /* Stop that thread */ |
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181 int fd_out_stop(struct fd_peer * peer) |
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182 { |
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183 TRACE_ENTRY("%p", peer); |
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184 CHECK_PARAMS( CHECK_PEER(peer) ); |
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185 |
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186 CHECK_FCT( fd_thr_term(&peer->p_outthr) ); |
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187 |
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188 return 0; |
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189 } |
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190 |