1 /* messaging - Function related to messaging code specific to SG */
3 /* Copyright (c) 2005, 2006, 2007, 2008, 2009, 2010. The SimGrid Team.
4 * All rights reserved. */
6 /* This program is free software; you can redistribute it and/or modify it
7 * under the terms of the license (GNU LGPL) which comes with this package. */
11 #include "gras/Virtu/virtu_sg.h"
13 #include "gras/Msg/msg_private.h"
15 #include "gras/DataDesc/datadesc_interface.h"
16 #include "gras/Transport/transport_interface.h" /* gras_trp_chunk_send/recv */
17 #include "gras/Transport/transport_private.h" /* sock->data */
19 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(gras_msg);
21 typedef void *gras_trp_bufdata_;
22 #include "simix/datatypes.h"
23 #include "simix/private.h"
25 /* Yeah, the following is awfull, breaking the encapsulation of at least 3 modules
26 * at the same time, but I'm tracking this bug since too long now, I want it dead. now.
30 xbt_thread_t listener;
31 } *fake_gras_msg_listener_t;
33 smx_process_t s_process;
36 int gras_socket_im_the_server(gras_socket_t sock) {
37 gras_trp_sg_sock_data_t sock_data = sock->data;
39 gras_msg_listener_t l;
40 xbt_thread_t listener_thread;
41 smx_process_t server_listener_process=NULL;
42 smx_process_t client_listener_process = NULL;
44 XBT_VERB("Am I the server of socket %p (client = %p, server = %p) ? process self: %p", sock, sock_data->client, sock_data->server, SIMIX_process_self());
46 if (sock_data->server == SIMIX_process_self()) {
47 XBT_VERB("I am the server");
50 if (sock_data->client == SIMIX_process_self()) {
51 XBT_VERB("I am the client");
54 XBT_VERB("I am neither the client nor the server, probably a listener");
56 /* neither the client nor the server. Check their respective listeners */
57 pd = ((gras_procdata_t*)SIMIX_process_get_data(sock_data->server));
60 listener_thread = ((fake_gras_msg_listener_t)l)->listener;
61 server_listener_process = ((fake_xbt_thread_t)listener_thread)->s_process;
62 if (server_listener_process == SIMIX_process_self()) {
63 XBT_VERB("I am the listener of the server");
68 if (sock_data->client) {
69 pd = ((gras_procdata_t*)SIMIX_process_get_data(sock_data->client));
72 listener_thread = ((fake_gras_msg_listener_t)l)->listener;
73 client_listener_process = ((fake_xbt_thread_t)listener_thread)->s_process;
74 if (client_listener_process == SIMIX_process_self()) {
75 XBT_VERB("I am the listener of the client");
80 /* THAT'S BAD! I should be either client or server of the sockets I get messages on!! */
81 /* This is where the bug is visible. Try to die as loudly as possible */
82 xbt_backtrace_display_current();
83 ((char*)sock)[sizeof(*sock)+1] = '0'; /* Try to make valgrind angry to see where that damn socket comes from */
84 if(system(bprintf("cat /proc/%d/maps 1>&2",getpid()))){}
85 XBT_INFO("I'm not the client in socket %p (comm:%p, rdvser=%p, rdvcli=%p) to %s, that's %s",
86 sock,sock_data->comm_recv,sock_data->rdv_server,sock_data->rdv_client,
87 SIMIX_host_get_name(SIMIX_process_get_host(sock_data->server)),
88 sock_data->client?SIMIX_host_get_name(SIMIX_process_get_host(sock_data->client)):"(no client)");
89 XBT_INFO("server:%s (%p) server_listener=%p client:%s (%p) client_listener=%p, I'm %p",
90 SIMIX_host_get_name(SIMIX_process_get_host(sock_data->server)), sock_data->server,server_listener_process,
91 sock_data->client?SIMIX_host_get_name(SIMIX_process_get_host(sock_data->client)):"(no client)", sock_data->client,client_listener_process,
92 SIMIX_process_self());
93 xbt_die("Bailing out after finding that damn bug");
97 gras_msg_t gras_msg_recv_any(void)
99 gras_trp_procdata_t trp_proc =
100 (gras_trp_procdata_t) gras_libdata_by_name("gras_trp");
102 /* Build a dynar of all communications I could get something from */
103 xbt_dynar_t comms = xbt_dynar_new(sizeof(smx_action_t), NULL);
104 unsigned int cursor = 0;
106 gras_socket_t sock = NULL;
107 gras_trp_sg_sock_data_t sock_data;
108 xbt_dynar_foreach(trp_proc->sockets, cursor, sock) {
109 sock_data = (gras_trp_sg_sock_data_t) sock->data;
113 ("Consider socket %p (data:%p; Here rdv: %p; Remote rdv: %p; Comm %p) to get a message",
115 gras_socket_im_the_server(sock)?
116 sock_data->rdv_server : sock_data->rdv_client,
117 gras_socket_im_the_server(sock)?
118 sock_data->rdv_client : sock_data->rdv_server,
119 sock_data->comm_recv);
122 /* If the following assert fails in some valid conditions, we need to
123 * change the code downward looking for the socket again.
125 * For now it relies on the facts (A) that sockets and comms are aligned
126 * (B) every sockets has a posted irecv in comms
128 * This is not trivial because we need that alignment to hold after the waitany(), so
129 * after other processes get scheduled.
131 * I cannot think of conditions where they get desynchronized (A violated) as long as
132 * 1) only the listener calls that function
133 * 2) Nobody but the listener removes sockets from that set (in main listener loop)
134 * 3) New sockets are added at the end, and signified ASAP to the listener (by awaking him)
135 * The throw bellow ensures that B is never violated without failing out loudly.
137 * We cannot search by comparing the comm object pointer that object got
138 * freed by the waiting process (down in smx_network, in
139 * comm_wait_for_completion or comm_cleanup). So, actually, we could
140 * use that pointer since that's a dangling pointer, but no one changes it.
141 * I still feel unconfortable with using dangling pointers, even if that would
142 * let the code work even if A and/or B are violated, provided that
143 * (C) the new irecv is never posted before we return from waitany to that function.
145 * Another approach, robust to B violation would be to retraverse the socks dynar with
146 * an iterator, incremented only when the socket has a comm. And we've the right socket
147 * when that iterator is equal to "got", the result of waitany. Not needed if B holds.
149 xbt_assert(sock_data->comm_recv,
150 "Comm_recv of socket %p is empty; please report that nasty bug",
152 /* End of paranoia */
154 XBT_VERB("Consider receiving messages from on comm_recv %p rdv:%p (other rdv:%p)",
155 sock_data->comm_recv,
156 gras_socket_im_the_server(sock)?
157 sock_data->rdv_server : sock_data->rdv_client,
158 gras_socket_im_the_server(sock)?
159 sock_data->rdv_client : sock_data->rdv_server);
160 xbt_dynar_push(comms, &(sock_data->comm_recv));
162 XBT_VERB("Wait on %ld 'sockets'", xbt_dynar_length(comms));
163 /* Wait for the end of any of these communications */
164 got = SIMIX_req_comm_waitany(comms);
166 /* retrieve the message sent in that communication */
167 sock = xbt_dynar_get_as(trp_proc->sockets, got, gras_socket_t);
168 sock_data = (gras_trp_sg_sock_data_t) sock->data;
169 msg = sock_data->msg;
170 XBT_VERB("Got something. Communication over rdv_server=%p, rdv_client=%p",
171 sock_data->rdv_server,sock_data->rdv_client);
173 /* Reinstall a waiting communication on that rdv */
174 /* xbt_dynar_foreach(trp_proc->sockets,cursor,sock) {
175 sock_data = (gras_trp_sg_sock_data_t) sock->data;
176 if (sock_data->comm_recv && sock_data->comm_recv == comm)
180 sock_data->comm_recv =
181 SIMIX_req_comm_irecv(gras_socket_im_the_server(sock) ?
182 sock_data->rdv_server : sock_data->rdv_client,
183 &sock_data->msg, NULL, NULL, NULL);
189 void gras_msg_send_ext(gras_socket_t sock,
190 e_gras_msg_kind_t kind,
191 unsigned long int ID,
192 gras_msgtype_t msgtype, void *payload)
194 int whole_payload_size = 0; /* msg->payload_size is used to memcpy the payload.
195 This is used to report the load onto the simulator. It also counts the size of pointed stuff */
196 gras_msg_t msg; /* message to send */
198 gras_trp_sg_sock_data_t sock_data = (gras_trp_sg_sock_data_t) sock->data;
200 smx_rdv_t target_rdv =
201 (sock_data->server == SIMIX_process_self())?
202 sock_data->rdv_client :
203 sock_data->rdv_server;
205 /*initialize gras message */
206 msg = xbt_new(s_gras_msg_t, 1);
213 XBT_VERB("Send msg %s (%s) to rdv %p sock %p",
214 msgtype->name, e_gras_msg_kind_names[kind], target_rdv, sock);
216 if (kind == e_gras_msg_kind_rpcerror) {
217 /* error on remote host, careful, payload is an exception */
218 msg->payl_size = gras_datadesc_size(gras_datadesc_by_name("ex_t"));
219 msg->payl = xbt_malloc(msg->payl_size);
221 gras_datadesc_memcpy(gras_datadesc_by_name("ex_t"), payload,
223 } else if (kind == e_gras_msg_kind_rpcanswer) {
224 msg->payl_size = gras_datadesc_size(msgtype->answer_type);
226 msg->payl = xbt_malloc(msg->payl_size);
230 if (msgtype->answer_type)
231 whole_payload_size = gras_datadesc_memcpy(msgtype->answer_type,
234 msg->payl_size = gras_datadesc_size(msgtype->ctn_type);
235 msg->payl = msg->payl_size ? xbt_malloc(msg->payl_size) : NULL;
236 if (msgtype->ctn_type)
237 whole_payload_size = gras_datadesc_memcpy(msgtype->ctn_type,
241 comm = SIMIX_req_comm_isend(target_rdv, whole_payload_size, -1, msg, sizeof(void *), NULL, msg, 0);
242 SIMIX_req_comm_wait(comm, -1);
244 XBT_VERB("Message sent (and received)");