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
  40         DEBUG0("Trying to get the lock pd, trp_select");
  41         SIMIX_mutex_lock(pd->mutex);
  42         DEBUG3("select on %s@%s with timeout=%f",
  43                         SIMIX_process_get_name(SIMIX_process_self()),
  44                         SIMIX_host_get_name(SIMIX_host_self()),
  45                         timeout);
  46
  47         if (xbt_fifo_size(pd->active_socket) == 0) {
  48         /* message didn't arrive yet, wait */
  49                 SIMIX_cond_wait_timeout(pd->cond,pd->mutex,timeout);
  50         }
  51
  52         if (xbt_fifo_size(pd->active_socket) == 0) {
  53                 DEBUG0("TIMEOUT");
  54                 SIMIX_mutex_unlock(pd->mutex);
  55                 THROW0(timeout_error,0,"Timeout");
  56         }
  57         active_socket = xbt_fifo_shift(pd->active_socket);
  58
  59         /* Ok, got something. Open a socket back to the expeditor */
  60
  61         /* Try to reuse an already openned socket to that expeditor */
  62         DEBUG1("Open sockets size %lu",xbt_dynar_length(pd->sockets));
  63         xbt_dynar_foreach(pd->sockets,cursor,sock_iter) {
  64                 DEBUG1("Consider %p as outgoing socket to expeditor",sock_iter);
  65
  66                 if (sock_iter->meas || !sock_iter->outgoing)
  67                         continue;
  68                 if ((sock_iter->peer_port == active_socket->port) &&
  69                                 (((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))) {
  70                         SIMIX_mutex_unlock(pd->mutex);
  71                         return sock_iter;
  72                 }
  73         }
  74
  75         /* Socket to expeditor not created yet */
  76         DEBUG0("Create a socket to the expeditor");
  77
  78         trp = gras_trp_plugin_get_by_name("sg");
  79
  80         gras_trp_socket_new(1,&res);
  81         res->plugin   = trp;
  82
  83         res->incoming  = 1;
  84         res->outgoing  = 1;
  85         res->accepting = 0;
  86         res->sd        = -1;
  87
  88         res->port = -1;
  89
  90         /* unitialize the ports */
  91         res->peer_port = active_socket->port;
  92         res->port = active_socket->peer_port;
  93
  94         /* create sockdata */
  95         sockdata = xbt_new(gras_trp_sg_sock_data_t,1);
  96         sockdata->from_process = SIMIX_process_self();
  97         sockdata->to_process   = ((gras_trp_sg_sock_data_t*)(active_socket->data))->from_process;
  98
  99         sockdata->to_host  = SIMIX_process_get_host(((gras_trp_sg_sock_data_t*)(active_socket->data))->from_process);
 100
 101         res->data = sockdata;
 102         res->peer_name = strdup(SIMIX_host_get_name(sockdata->to_host));
 103
 104         gras_trp_buf_init_sock(res);
 105
 106         DEBUG4("Create socket to process:%s(Port %d) from process: %s(Port %d)",SIMIX_process_get_name(sockdata->from_process),res->peer_port, SIMIX_process_get_name(sockdata->to_process), res->port);
 107
 108         SIMIX_mutex_unlock(pd->mutex);
 109         return res;
 110 }
 111
 112
 113 /* dummy implementations of the functions used in RL mode */
 114
 115 void gras_trp_tcp_setup(gras_trp_plugin_t plug) {  THROW0(mismatch_error,0,NULL); }
 116 void gras_trp_file_setup(gras_trp_plugin_t plug){  THROW0(mismatch_error,0,NULL); }
 117 void gras_trp_iov_setup(gras_trp_plugin_t plug) {  THROW0(mismatch_error,0,NULL); }
 118
 119 gras_socket_t gras_trp_buf_init_sock(gras_socket_t sock) { return sock;}
 120