3 /* sg_transport - SG specific functions for transport */
5 /* Copyright (c) 2004 Martin Quinson. All rights reserved. */
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. */
11 #include "gras/Transport/transport_private.h"
12 #include "gras/Virtu/virtu_sg.h"
14 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(gras_trp);
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;
22 * Returns the next socket to service having a message awaiting.
24 * if timeout<0, we ought to implement the adaptative timeout (FIXME)
26 * if timeout=0, do not wait for new message, only handle the ones already there.
28 * if timeout>0 and no message there, wait at most that amount of time before giving up.
30 gras_socket_t gras_trp_select(double timeout) {
32 gras_trp_procdata_t pd =
33 (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_trp_sg_sock_data_t *active_socket_data;
38 gras_socket_t sock_iter; /* iterating over all sockets */
41 DEBUG0("Trying to get the lock pd, trp_select");
42 SIMIX_mutex_lock(pd->msg_select_mutex);
43 DEBUG3("select on %s@%s with timeout=%f",
44 SIMIX_process_get_name(SIMIX_process_self()),
45 SIMIX_host_get_name(SIMIX_host_self()),
48 if (xbt_fifo_size(pd->msg_selectable_sockets) == 0) {
49 /* message didn't arrive yet, wait */
50 SIMIX_cond_wait_timeout(pd->msg_select_cond,pd->msg_select_mutex,timeout);
53 if (xbt_fifo_size(pd->msg_selectable_sockets) == 0) {
55 SIMIX_mutex_unlock(pd->msg_select_mutex);
56 THROW0(timeout_error,0,"Timeout");
58 active_socket = xbt_fifo_shift(pd->msg_selectable_sockets);
59 active_socket_data = (gras_trp_sg_sock_data_t*)active_socket->data;
61 /* Ok, got something. Open a socket back to the expeditor */
63 /* Try to reuse an already openned socket to that expeditor */
64 DEBUG1("Open sockets size %lu",xbt_dynar_length(pd->sockets));
65 xbt_dynar_foreach(pd->sockets,cursor,sock_iter) {
66 gras_trp_sg_sock_data_t *sock_data;
67 DEBUG1("Consider %p as outgoing socket to expeditor",sock_iter);
69 if (sock_iter->meas || !sock_iter->outgoing)
71 sock_data = ((gras_trp_sg_sock_data_t*)sock_iter->data);
73 if ( (sock_data->to_socket == active_socket) &&
74 (sock_data->to_host == SIMIX_process_get_host(active_socket_data->from_process)) ) {
75 SIMIX_mutex_unlock(pd->msg_select_mutex);
80 /* Socket to expeditor not created yet */
81 DEBUG0("Create a socket to the expeditor");
83 trp = gras_trp_plugin_get_by_name("sg");
85 gras_trp_socket_new(1,&res);
95 /* initialize the ports */
96 //res->peer_port = active_socket->port;
97 res->port = active_socket->peer_port;
100 sockdata = xbt_new(gras_trp_sg_sock_data_t,1);
101 sockdata->from_process = SIMIX_process_self();
102 sockdata->to_process = active_socket_data->from_process;
105 ((gras_trp_procdata_t)gras_libdata_by_name_from_remote("gras_trp",sockdata->to_process))->myport;
106 sockdata->to_socket = active_socket;
107 /*update the peer to_socket variable */
108 active_socket_data->to_socket = res;
109 sockdata->cond = SIMIX_cond_init();
110 sockdata->mutex = SIMIX_mutex_init();
112 sockdata->to_host = SIMIX_process_get_host(active_socket_data->from_process);
114 res->data = sockdata;
115 res->peer_name = strdup(SIMIX_host_get_name(sockdata->to_host));
117 gras_trp_buf_init_sock(res);
119 DEBUG4("Create socket to process:%s(Port %d) from process: %s(Port %d)",
120 SIMIX_process_get_name(sockdata->from_process),
122 SIMIX_process_get_name(sockdata->to_process), res->port);
124 SIMIX_mutex_unlock(pd->msg_select_mutex);
129 /* dummy implementations of the functions used in RL mode */
131 void gras_trp_tcp_setup(gras_trp_plugin_t plug) { THROW0(mismatch_error,0,NULL); }
132 void gras_trp_file_setup(gras_trp_plugin_t plug){ THROW0(mismatch_error,0,NULL); }
133 void gras_trp_iov_setup(gras_trp_plugin_t plug) { THROW0(mismatch_error,0,NULL); }
135 gras_socket_t gras_trp_buf_init_sock(gras_socket_t sock) { return sock;}