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"
13 #include "gras/Virtu/virtu_sg.h"
15 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(gras_trp);
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;
23 * Returns the next socket to service having a message awaiting.
25 * if timeout<0, we ought to implement the adaptative timeout (FIXME)
27 * if timeout=0, do not wait for new message, only handle the ones already there.
29 * if timeout>0 and no message there, wait at most that amount of time before giving up.
31 gras_socket_t gras_trp_select(double timeout) {
34 gras_trp_procdata_t pd =
35 (gras_trp_procdata_t) gras_libdata_by_id(gras_trp_libdata_id);
36 gras_trp_sg_sock_data_t *sockdata;
37 gras_trp_plugin_t trp;
39 gras_socket_t sock_iter; /* iterating over all sockets */
42 gras_sg_portrec_t pr; /* iterating to find the chanel of expeditor */
45 gras_hostdata_t *remote_hd;
47 DEBUG3("select on %s@%s with timeout=%f",
48 MSG_process_get_name(MSG_process_self()),
49 MSG_host_get_name(MSG_host_self()),
52 MSG_channel_select_from((m_channel_t) pd->chan, timeout, &r_pid);
56 THROW0(timeout_error,0,"Timeout");
59 /* Ok, got something. Open a socket back to the expeditor */
61 /* Try to reuse an already openned socket to that expeditor */
62 xbt_dynar_foreach(pd->sockets,cursor,sock_iter) {
63 DEBUG1("Consider %p as outgoing socket to expeditor",sock_iter);
65 if (sock_iter->meas || !sock_iter->outgoing)
68 sockdata = sock_iter->data;
69 if (sockdata->to_PID == r_pid) {
74 /* Socket to expeditor not created yet */
75 DEBUG0("Create a socket to the expeditor");
77 trp = gras_trp_plugin_get_by_name("sg");
79 gras_trp_socket_new(1,&res);
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->to_host = MSG_process_get_host(MSG_process_from_PID(r_pid));
94 gras_trp_buf_init_sock(res);
96 res->peer_name = strdup(MSG_host_get_name(sockdata->to_host));
98 remote_hd=(gras_hostdata_t *)MSG_host_get_data(sockdata->to_host);
99 xbt_assert0(remote_hd,"Run gras_process_init!!");
101 sockdata->to_chan = -1;
102 res->peer_port = -10;
103 for (cursor=0; cursor<XBT_MAX_CHANNEL; cursor++) {
104 if (remote_hd->proc[cursor] == r_pid) {
105 sockdata->to_chan = cursor;
106 DEBUG2("Chan %d on %s is for my pal",
107 cursor,res->peer_name);
109 xbt_dynar_foreach(remote_hd->ports, cpt, pr) {
110 if (sockdata->to_chan == pr.tochan) {
112 DEBUG0("Damn, it's for measurement");
116 res->peer_port = pr.port;
117 DEBUG1("Cool, it points to port %d", pr.port);
120 DEBUG2("Wrong port (tochan=%d, looking for %d)\n",
121 pr.tochan,sockdata->to_chan);
124 if (res->peer_port == -10) {
125 /* was for measurement */
126 sockdata->to_chan = -1;
128 /* found it, don't let it override by meas */
133 res->peer_port = ((gras_trp_procdata_t) gras_libdata_by_name_from_remote("gras_trp",MSG_process_from_PID(r_pid)))->myport;
134 xbt_assert0(sockdata->to_chan != -1,
135 "Got a message from a process without channel");
141 /* dummy implementations of the functions used in RL mode */
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); }
147 gras_socket_t gras_trp_buf_init_sock(gras_socket_t sock) { return sock;}