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;
45 if (sock_data->server == SIMIX_process_self())
47 if (sock_data->client == SIMIX_process_self())
50 /* neither the client nor the server. Check their respective listeners */
51 pd = ((gras_procdata_t*)SIMIX_process_get_data(sock_data->server));
54 listener_thread = ((fake_gras_msg_listener_t)l)->listener;
55 server_listener_process = ((fake_xbt_thread_t)listener_thread)->s_process;
56 if (server_listener_process == SIMIX_process_self())
60 if (sock_data->client) {
61 pd = ((gras_procdata_t*)SIMIX_process_get_data(sock_data->client));
64 listener_thread = ((fake_gras_msg_listener_t)l)->listener;
65 client_listener_process = ((fake_xbt_thread_t)listener_thread)->s_process;
66 if (client_listener_process == SIMIX_process_self())
70 /* THAT'S BAD! I should be either client or server of the sockets I get messages on!! */
71 /* This is where the bug is visible. Try to die as loudly as possible */
72 xbt_backtrace_display_current();
73 ((char*)sock)[sizeof(*sock)+1] = '0'; /* Try to make valgrind angry to see where that damn socket comes from */
74 system(bprintf("cat /proc/%d/maps 1>&2",getpid()));
75 INFO0(bprintf("I'm not the client in socket %p (comm:%p, rdvser=%p, rdvcli=%p) to %s, that's %s",
76 sock,sock_data->comm_recv,sock_data->rdv_server,sock_data->rdv_client,
77 SIMIX_host_get_name(SIMIX_process_get_host(sock_data->server)),
78 sock_data->client?SIMIX_host_get_name(SIMIX_process_get_host(sock_data->client)):"(no client)"));
79 INFO7("server:%s (%p) server_listener=%p client:%s (%p) client_listener=%p, I'm %p",
80 SIMIX_host_get_name(SIMIX_process_get_host(sock_data->server)), sock_data->server,server_listener_process,
81 sock_data->client?SIMIX_host_get_name(SIMIX_process_get_host(sock_data->client)):"(no client)", sock_data->client,client_listener_process,
82 SIMIX_process_self());
83 xbt_die("Bailing out after finding that damn bug");
87 gras_msg_t gras_msg_recv_any(void)
89 gras_trp_procdata_t trp_proc =
90 (gras_trp_procdata_t) gras_libdata_by_name("gras_trp");
92 /* Build a dynar of all communications I could get something from */
93 xbt_dynar_t comms = xbt_dynar_new(sizeof(smx_comm_t), NULL);
94 unsigned int cursor = 0;
96 smx_comm_t comm = NULL;
97 gras_socket_t sock = NULL;
98 gras_trp_sg_sock_data_t sock_data;
99 xbt_dynar_foreach(trp_proc->sockets, cursor, sock) {
100 sock_data = (gras_trp_sg_sock_data_t) sock->data;
104 ("Consider socket %p (data:%p; Here rdv: %p; Remote rdv: %p; Comm %p) to get a message",
106 gras_socket_im_the_server(sock)?
107 sock_data->rdv_server : sock_data->rdv_client,
108 gras_socket_im_the_server(sock)?
109 sock_data->rdv_client : sock_data->rdv_server,
110 sock_data->comm_recv);
113 /* If the following assert fails in some valid conditions, we need to
114 * change the code downward looking for the socket again.
116 * For now it relies on the facts (A) that sockets and comms are aligned
117 * (B) every sockets has a posted irecv in comms
119 * This is not trivial because we need that alignment to hold after the waitany(), so
120 * after other processes get scheduled.
122 * I cannot think of conditions where they get desynchronized (A violated) as long as
123 * 1) only the listener calls that function
124 * 2) Nobody but the listener removes sockets from that set (in main listener loop)
125 * 3) New sockets are added at the end, and signified ASAP to the listener (by awaking him)
126 * The throw bellow ensures that B is never violated without failing out loudly.
128 * We cannot search by comparing the comm object pointer that object got
129 * freed by the waiting process (down in smx_network, in
130 * comm_wait_for_completion or comm_cleanup). So, actually, we could
131 * use that pointer since that's a dangling pointer, but no one changes it.
132 * I still feel unconfortable with using dangling pointers, even if that would
133 * let the code work even if A and/or B are violated, provided that
134 * (C) the new irecv is never posted before we return from waitany to that function.
136 * Another approach, robust to B violation would be to retraverse the socks dynar with
137 * an iterator, incremented only when the socket has a comm. And we've the right socket
138 * when that iterator is equal to "got", the result of waitany. Not needed if B holds.
140 xbt_assert1(sock_data->comm_recv,
141 "Comm_recv of socket %p is empty; please report that nasty bug",
143 /* End of paranoia */
145 VERB4("Consider receiving messages from on comm_recv %p (%s) rdv:%p (other rdv:%p)",
146 sock_data->comm_recv, sock_data->comm_recv->type == comm_send? "send":"recv",
147 gras_socket_im_the_server(sock)?
148 sock_data->rdv_server : sock_data->rdv_client,
149 gras_socket_im_the_server(sock)?
150 sock_data->rdv_client : sock_data->rdv_server);
151 xbt_dynar_push(comms, &(sock_data->comm_recv));
153 VERB1("Wait on %ld 'sockets'", xbt_dynar_length(comms));
154 /* Wait for the end of any of these communications */
155 got = SIMIX_network_waitany(comms);
157 /* retrieve the message sent in that communication */
158 xbt_dynar_get_cpy(comms, got, &(comm));
159 msg = SIMIX_communication_get_data(comm);
160 sock = xbt_dynar_get_as(trp_proc->sockets, got, gras_socket_t);
161 sock_data = (gras_trp_sg_sock_data_t) sock->data;
162 VERB3("Got something. Communication %p's over rdv_server=%p, rdv_client=%p",
163 comm,sock_data->rdv_server,sock_data->rdv_client);
164 SIMIX_communication_destroy(comm);
166 /* Reinstall a waiting communication on that rdv */
167 /* xbt_dynar_foreach(trp_proc->sockets,cursor,sock) {
168 sock_data = (gras_trp_sg_sock_data_t) sock->data;
169 if (sock_data->comm_recv && sock_data->comm_recv == comm)
173 sock_data->comm_recv =
174 SIMIX_network_irecv(gras_socket_im_the_server(sock) ?
175 sock_data->rdv_server : sock_data->rdv_client,
182 void gras_msg_send_ext(gras_socket_t sock,
183 e_gras_msg_kind_t kind,
184 unsigned long int ID,
185 gras_msgtype_t msgtype, void *payload)
187 int whole_payload_size = 0; /* msg->payload_size is used to memcpy the payload.
188 This is used to report the load onto the simulator. It also counts the size of pointed stuff */
189 gras_msg_t msg; /* message to send */
191 gras_trp_sg_sock_data_t sock_data = (gras_trp_sg_sock_data_t) sock->data;
193 smx_rdv_t target_rdv =
194 (sock_data->server == SIMIX_process_self())?
195 sock_data->rdv_client :
196 sock_data->rdv_server;
198 /*initialize gras message */
199 msg = xbt_new(s_gras_msg_t, 1);
206 VERB4("Send msg %s (%s) to rdv %p sock %p",
207 msgtype->name, e_gras_msg_kind_names[kind], target_rdv, sock);
209 if (kind == e_gras_msg_kind_rpcerror) {
210 /* error on remote host, careful, payload is an exception */
211 msg->payl_size = gras_datadesc_size(gras_datadesc_by_name("ex_t"));
212 msg->payl = xbt_malloc(msg->payl_size);
214 gras_datadesc_memcpy(gras_datadesc_by_name("ex_t"), payload,
216 } else if (kind == e_gras_msg_kind_rpcanswer) {
217 msg->payl_size = gras_datadesc_size(msgtype->answer_type);
219 msg->payl = xbt_malloc(msg->payl_size);
223 if (msgtype->answer_type)
224 whole_payload_size = gras_datadesc_memcpy(msgtype->answer_type,
227 msg->payl_size = gras_datadesc_size(msgtype->ctn_type);
228 msg->payl = msg->payl_size ? xbt_malloc(msg->payl_size) : NULL;
229 if (msgtype->ctn_type)
230 whole_payload_size = gras_datadesc_memcpy(msgtype->ctn_type,
234 SIMIX_network_send(target_rdv, whole_payload_size, -1, -1, &msg,
235 sizeof(void *), &comm, msg);
237 VERB0("Message sent (and received)");