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         gras_trp_procdata_t pd = (gras_trp_procdata_t) gras_libdata_by_id(gras_trp_libdata_id);
  34         gras_trp_sg_sock_data_t *sockdata;
  35         gras_trp_plugin_t trp;
  36         gras_socket_t active_socket;
  37         gras_socket_t sock_iter; /* iterating over all sockets */
  38         int cursor;
  39 //      int i;
  40
  41         gras_hostdata_t *remote_hd;
  42 //      gras_hostdata_t *local_hd;
  43
  44         DEBUG0("Trying to get the lock pd, trp_select");
  45         SIMIX_mutex_lock(pd->mutex);
  46         DEBUG3("select on %s@%s with timeout=%f",
  47                         SIMIX_process_get_name(SIMIX_process_self()),
  48                         SIMIX_host_get_name(SIMIX_host_self()),
  49                         timeout);
  50
  51         if (xbt_fifo_size(pd->active_socket) == 0) {
  52         /* message didn't arrive yet, wait */
  53                 SIMIX_cond_wait_timeout(pd->cond,pd->mutex,timeout);
  54         }
  55
  56         if (xbt_fifo_size(pd->active_socket) == 0) {
  57                 DEBUG0("TIMEOUT");
  58                 SIMIX_mutex_unlock(pd->mutex);
  59                 THROW0(timeout_error,0,"Timeout");
  60         }
  61         active_socket = xbt_fifo_shift(pd->active_socket);
  62
  63         /* Ok, got something. Open a socket back to the expeditor */
  64
  65         /* Try to reuse an already openned socket to that expeditor */
  66         DEBUG1("Open sockets size %lu",xbt_dynar_length(pd->sockets));
  67         xbt_dynar_foreach(pd->sockets,cursor,sock_iter) {
  68                 DEBUG1("Consider %p as outgoing socket to expeditor",sock_iter);
  69
  70                 if (sock_iter->meas || !sock_iter->outgoing)
  71                         continue;
  72                 if ((sock_iter->peer_port == active_socket->port) &&
  73                                 (((gras_trp_sg_sock_data_t*)sock_iter->data)->to_host == SIMIX_process_get_host(((gras_trp_sg_sock_data_t*)active_socket->data)->from_process))) {
  74                         SIMIX_mutex_unlock(pd->mutex);
  75                         return sock_iter;
  76                 }
  77         }
  78
  79         /* Socket to expeditor not created yet */
  80         DEBUG0("Create a socket to the expeditor");
  81
  82         trp = gras_trp_plugin_get_by_name("sg");
  83
  84         gras_trp_socket_new(1,&res);
  85         res->plugin   = trp;
  86
  87         res->incoming  = 1;
  88         res->outgoing  = 1;
  89         res->accepting = 0;
  90         res->sd        = -1;
  91
  92         res->port = -1;
  93
  94         sockdata = xbt_new(gras_trp_sg_sock_data_t,1);
  95         sockdata->from_process = SIMIX_process_self();
  96         sockdata->to_process   = ((gras_trp_sg_sock_data_t*)(active_socket->data))->from_process;
  97
  98         DEBUG2("Create socket to process:%s from process: %s",SIMIX_process_get_name(sockdata->from_process),SIMIX_process_get_name(sockdata->to_process));
  99         /* complicated*/
 100         sockdata->to_host  = SIMIX_process_get_host(((gras_trp_sg_sock_data_t*)(active_socket->data))->from_process);
 101
 102         res->data = sockdata;
 103         gras_trp_buf_init_sock(res);
 104
 105         res->peer_name = strdup(SIMIX_host_get_name(sockdata->to_host));
 106
 107         remote_hd=(gras_hostdata_t *)SIMIX_host_get_data(sockdata->to_host);
 108         xbt_assert0(remote_hd,"Run gras_process_init!!");
 109
 110         res->peer_port = active_socket->port;
 111
 112         res->port = active_socket->peer_port;
 113         /* search for a free port on the host */
 114         /*
 115         local_hd = (gras_hostdata_t *)SIMIX_host_get_data(SIMIX_host_self());
 116         for (i=1;i<65536;i++) {
 117                 if (local_hd->cond_port[i] == NULL)
 118                         break;
 119         }
 120         if (i == 65536) {
 121                 SIMIX_mutex_unlock(pd->mutex);
 122                 THROW0(system_error,0,"No port free");
 123         }
 124         res->port = i;*/
 125         /*initialize the cond and mutex */
 126         /*
 127         local_hd->cond_port[i] = SIMIX_cond_init();
 128         local_hd->mutex_port[i] = SIMIX_mutex_init();
 129         */
 130         /* update remote peer_port to talk through the new port */
 131         active_socket->peer_port = res->port;
 132
 133
 134
 135         DEBUG2("New socket: Peer port %d Local port %d", res->peer_port, res->port);
 136         SIMIX_mutex_unlock(pd->mutex);
 137         return res;
 138 }
 139
 140
 141 /* dummy implementations of the functions used in RL mode */
 142
 143 void gras_trp_tcp_setup(gras_trp_plugin_t plug) {  THROW0(mismatch_error,0,NULL); }
 144 void gras_trp_file_setup(gras_trp_plugin_t plug){  THROW0(mismatch_error,0,NULL); }
 145 void gras_trp_iov_setup(gras_trp_plugin_t plug) {  THROW0(mismatch_error,0,NULL); }
 146
 147 gras_socket_t gras_trp_buf_init_sock(gras_socket_t sock) { return sock;}
 148