src/gras_simix/Transport/gras_simix_sg_transport.c

   1 /* $Id$ */
   2
   3 /* sg_transport - SG specific functions for transport                       */
   4
   5 /* Copyright (c) 2004 Martin Quinson. All rights reserved.                  */
   6
   7 /* This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the license (GNU LGPL) which comes with this package. */
   9
  10 #include "xbt/ex.h"
  11 #include "gras_simix/Transport/gras_simix_transport_private.h"
  12 //#include "msg/msg.h"
  13 #include "gras_simix/Virtu/gras_simix_virtu_sg.h"
  14
  15 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(gras_trp);
  16
  17 /* check transport_private.h for an explanation of this variable; this just need to be defined to NULL in SG */
  18 gras_socket_t _gras_lastly_selected_socket = NULL;
  19
  20 /**
  21  * gras_trp_select:
  22  *
  23  * Returns the next socket to service having a message awaiting.
  24  *
  25  * if timeout<0, we ought to implement the adaptative timeout (FIXME)
  26  *
  27  * if timeout=0, do not wait for new message, only handle the ones already there.
  28  *
  29  * if timeout>0 and no message there, wait at most that amount of time before giving up.
  30  */
  31 gras_socket_t gras_trp_select(double timeout) {
  32         gras_socket_t res;
  33         res = xbt_new(s_gras_socket_t,1);
  34         gras_trp_procdata_t pd = (gras_trp_procdata_t) gras_libdata_by_id(gras_trp_libdata_id);
  35         gras_trp_sg_sock_data_t *sockdata;
  36         gras_trp_plugin_t trp;
  37         gras_socket_t sock_iter; /* iterating over all sockets */
  38         int cursor;
  39
  40         //gras_sg_portrec_t pr;     /* iterating to find the chanel of expeditor */
  41 //      int r_pid;
  42         gras_hostdata_t *remote_hd;
  43
  44         SIMIX_mutex_lock(pd->mutex);
  45         DEBUG3("select on %s@%s with timeout=%f",
  46                         SIMIX_process_get_name(SIMIX_process_self()),
  47                         SIMIX_host_get_name(SIMIX_host_self()),
  48                         timeout);
  49         //MSG_channel_select_from((m_channel_t) pd->chan, timeout, &r_pid);
  50         SIMIX_cond_wait_timeout(pd->cond,pd->mutex,timeout);
  51
  52         if (pd->active_socket == NULL) {
  53                 DEBUG0("TIMEOUT");
  54                 THROW0(timeout_error,0,"Timeout");
  55         }
  56 /*      if (r_pid < 0) {
  57                 DEBUG0("TIMEOUT");
  58                 THROW0(timeout_error,0,"Timeout");
  59         }*/
  60
  61         /* Ok, got something. Open a socket back to the expeditor */
  62
  63         /* Try to reuse an already openned socket to that expeditor */
  64         xbt_dynar_foreach(pd->sockets,cursor,sock_iter) {
  65                 DEBUG1("Consider %p as outgoing socket to expeditor",sock_iter);
  66
  67                 if (sock_iter->meas || !sock_iter->outgoing)
  68                         continue;
  69                 if (sock_iter->peer_port == pd->active_socket->port)
  70                         return sock_iter;
  71
  72         }
  73
  74         /* Socket to expeditor not created yet */
  75         DEBUG0("Create a socket to the expeditor");
  76
  77         trp = gras_trp_plugin_get_by_name("sg");
  78
  79         gras_trp_socket_new(1,&res);
  80         res->plugin   = trp;
  81
  82         res->incoming  = 1;
  83         res->outgoing  = 1;
  84         res->accepting = 0;
  85         res->sd        = -1;
  86
  87         res->port = -1;
  88
  89         sockdata = xbt_new(gras_trp_sg_sock_data_t,1);
  90         //sockdata->from_PID = MSG_process_self_PID();
  91         //sockdata->to_PID   = r_pid;
  92         sockdata->from_process = SIMIX_process_self();
  93         sockdata->to_process   = ((gras_trp_sg_sock_data_t*)(pd->active_socket->data))->from_process;
  94
  95         /* complicated*/
  96         sockdata->to_host  = SIMIX_process_get_host(((gras_trp_sg_sock_data_t*)(pd->active_socket->data))->from_process);
  97         res->data = sockdata;
  98         gras_trp_buf_init_sock(res);
  99
 100         res->peer_name = strdup(SIMIX_host_get_name(sockdata->to_host));
 101
 102         remote_hd=(gras_hostdata_t *)SIMIX_host_get_data(sockdata->to_host);
 103         xbt_assert0(remote_hd,"Run gras_process_init!!");
 104
 105         //sockdata->to_chan = -1;
 106         res->peer_port = pd->active_socket->port;
 107         /*
 108         for (cursor=0; cursor<XBT_MAX_CHANNEL; cursor++) {
 109                 if (remote_hd->proc[cursor] == r_pid) {
 110                         sockdata->to_chan = cursor;
 111                         DEBUG2("Chan %d on %s is for my pal",
 112                                         cursor,res->peer_name);
 113
 114                         xbt_dynar_foreach(remote_hd->ports, cpt, pr) {
 115                                 if (sockdata->to_chan == pr.tochan) {
 116                                         if (pr.meas) {
 117                                                 DEBUG0("Damn, it's for measurement");
 118                                                 continue;
 119                                         }
 120
 121                                         res->peer_port = pr.port;
 122                                         DEBUG1("Cool, it points to port %d", pr.port);
 123                                         break;
 124                                 } else {
 125                                         DEBUG2("Wrong port (tochan=%d, looking for %d)\n",
 126                                                         pr.tochan,sockdata->to_chan);
 127                                 }
 128                         }
 129                         if (res->peer_port == -10) {
 130                                 sockdata->to_chan = -1;
 131                         } else {
 132                                 break;
 133                         }
 134                 }
 135         }
 136         */
 137
 138         DEBUG1("New socket: Peer port %d", res->peer_port);
 139         pd->active_socket=NULL;
 140         SIMIX_mutex_unlock(pd->mutex);
 141         return res;
 142 }
 143
 144
 145 /* dummy implementations of the functions used in RL mode */
 146
 147 void gras_trp_tcp_setup(gras_trp_plugin_t plug) {  THROW0(mismatch_error,0,NULL); }
 148 void gras_trp_file_setup(gras_trp_plugin_t plug){  THROW0(mismatch_error,0,NULL); }
 149 void gras_trp_iov_setup(gras_trp_plugin_t plug) {  THROW0(mismatch_error,0,NULL); }
 150
 151 gras_socket_t gras_trp_buf_init_sock(gras_socket_t sock) { return sock;}
 152