src/gras/Transport/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/Transport/transport_private.h"
  12 #include "gras/Virtu/virtu_sg.h"
  13
  14 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(gras_trp);
  15
  16 /* check transport_private.h for an explanation of this variable; this just need to be defined to NULL in SG */
  17 gras_socket_t _gras_lastly_selected_socket = NULL;
  18
  19 /**
  20  * gras_trp_select:
  21  *
  22  * Returns the next socket to service having a message awaiting.
  23  *
  24  * if timeout<0, we ought to implement the adaptative timeout (FIXME)
  25  *
  26  * if timeout=0, do not wait for new message, only handle the ones already there.
  27  *
  28  * if timeout>0 and no message there, wait at most that amount of time before giving up.
  29  */
  30 gras_socket_t gras_trp_select(double timeout) {
  31         gras_socket_t res;
  32         gras_trp_procdata_t pd = (gras_trp_procdata_t) gras_libdata_by_id(gras_trp_libdata_id);
  33         gras_trp_sg_sock_data_t *sockdata;
  34         gras_trp_plugin_t trp;
  35         gras_socket_t active_socket;
  36         gras_socket_t sock_iter; /* iterating over all sockets */
  37         int cursor;
  38
  39         DEBUG0("Trying to get the lock pd, trp_select");
  40         SIMIX_mutex_lock(pd->mutex);
  41         DEBUG3("select on %s@%s with timeout=%f",
  42                         SIMIX_process_get_name(SIMIX_process_self()),
  43                         SIMIX_host_get_name(SIMIX_host_self()),
  44                         timeout);
  45
  46         if (xbt_fifo_size(pd->active_socket) == 0) {
  47         /* message didn't arrive yet, wait */
  48                 SIMIX_cond_wait_timeout(pd->cond,pd->mutex,timeout);
  49         }
  50
  51         if (xbt_fifo_size(pd->active_socket) == 0) {
  52                 DEBUG0("TIMEOUT");
  53                 SIMIX_mutex_unlock(pd->mutex);
  54                 THROW0(timeout_error,0,"Timeout");
  55         }
  56         active_socket = xbt_fifo_shift(pd->active_socket);
  57
  58         /* Ok, got something. Open a socket back to the expeditor */
  59
  60         /* Try to reuse an already openned socket to that expeditor */
  61         DEBUG1("Open sockets size %lu",xbt_dynar_length(pd->sockets));
  62         xbt_dynar_foreach(pd->sockets,cursor,sock_iter) {
  63                 DEBUG1("Consider %p as outgoing socket to expeditor",sock_iter);
  64
  65                 if (sock_iter->meas || !sock_iter->outgoing)
  66                         continue;
  67                         /*
  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                                 */
  71                 if ( (((gras_trp_sg_sock_data_t*)sock_iter->data)->to_socket == active_socket) && (((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)) ) {
  72                         SIMIX_mutex_unlock(pd->mutex);
  73                         return sock_iter;
  74                 }
  75         }
  76
  77         /* Socket to expeditor not created yet */
  78         DEBUG0("Create a socket to the expeditor");
  79
  80         trp = gras_trp_plugin_get_by_name("sg");
  81
  82         gras_trp_socket_new(1,&res);
  83         res->plugin   = trp;
  84
  85         res->incoming  = 1;
  86         res->outgoing  = 1;
  87         res->accepting = 0;
  88         res->sd        = -1;
  89
  90         res->port = -1;
  91
  92         /* initialize the ports */
  93         //res->peer_port = active_socket->port;
  94         res->port = active_socket->peer_port;
  95
  96         /* create sockdata */
  97         sockdata = xbt_new(gras_trp_sg_sock_data_t,1);
  98         sockdata->from_process = SIMIX_process_self();
  99         sockdata->to_process   = ((gras_trp_sg_sock_data_t*)(active_socket->data))->from_process;
 100
 101         res->peer_port = ((gras_trp_procdata_t)gras_libdata_by_name_from_remote("gras_trp",sockdata->to_process))->myport;
 102         sockdata->to_socket = active_socket;
 103         /*update the peer to_socket  variable */
 104         ((gras_trp_sg_sock_data_t*)active_socket->data)->to_socket = res;
 105         sockdata->cond = SIMIX_cond_init();
 106         sockdata->mutex = SIMIX_mutex_init();
 107
 108         sockdata->to_host  = SIMIX_process_get_host(((gras_trp_sg_sock_data_t*)(active_socket->data))->from_process);
 109
 110         res->data = sockdata;
 111         res->peer_name = strdup(SIMIX_host_get_name(sockdata->to_host));
 112
 113         gras_trp_buf_init_sock(res);
 114
 115         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);
 116
 117         SIMIX_mutex_unlock(pd->mutex);
 118         return res;
 119 }
 120
 121
 122 /* dummy implementations of the functions used in RL mode */
 123
 124 void gras_trp_tcp_setup(gras_trp_plugin_t plug) {  THROW0(mismatch_error,0,NULL); }
 125 void gras_trp_file_setup(gras_trp_plugin_t plug){  THROW0(mismatch_error,0,NULL); }
 126 void gras_trp_iov_setup(gras_trp_plugin_t plug) {  THROW0(mismatch_error,0,NULL); }
 127
 128 gras_socket_t gras_trp_buf_init_sock(gras_socket_t sock) { return sock;}
 129