src/mc/mc_request.cpp

   1 /* Copyright (c) 2008-2019. The SimGrid Team. All rights reserved.          */
   2
   3 /* This program is free software; you can redistribute it and/or modify it
   4  * under the terms of the license (GNU LGPL) which comes with this package. */
   5
   6 #include "src/mc/mc_request.hpp"
   7 #include "src/include/mc/mc.h"
   8 #include "src/kernel/activity/CommImpl.hpp"
   9 #include "src/kernel/activity/MutexImpl.hpp"
  10 #include "src/mc/ModelChecker.hpp"
  11 #include "src/mc/mc_smx.hpp"
  12
  13 using simgrid::mc::remote;
  14
  15 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_request, mc,
  16                                 "Logging specific to MC (request)");
  17
  18 static char *pointer_to_string(void *pointer);
  19 static char *buff_size_to_string(size_t size);
  20
  21 static inline simgrid::kernel::activity::CommImpl* MC_get_comm(smx_simcall_t r)
  22 {
  23   switch (r->call ) {
  24   case SIMCALL_COMM_WAIT:
  25     return static_cast<simgrid::kernel::activity::CommImpl*>(simcall_comm_wait__getraw__comm(r));
  26   case SIMCALL_COMM_TEST:
  27     return static_cast<simgrid::kernel::activity::CommImpl*>(simcall_comm_test__getraw__comm(r));
  28   default:
  29     return nullptr;
  30   }
  31 }
  32
  33 static inline
  34 smx_mailbox_t MC_get_mbox(smx_simcall_t r)
  35 {
  36   switch(r->call) {
  37   case SIMCALL_COMM_ISEND:
  38     return simcall_comm_isend__get__mbox(r);
  39   case SIMCALL_COMM_IRECV:
  40     return simcall_comm_irecv__get__mbox(r);
  41   default:
  42     return nullptr;
  43   }
  44 }
  45
  46 namespace simgrid {
  47 namespace mc {
  48
  49 // Does half the job
  50 static inline
  51 bool request_depend_asymmetric(smx_simcall_t r1, smx_simcall_t r2)
  52 {
  53   if (r1->call == SIMCALL_COMM_ISEND && r2->call == SIMCALL_COMM_IRECV)
  54     return false;
  55
  56   if (r1->call == SIMCALL_COMM_IRECV && r2->call == SIMCALL_COMM_ISEND)
  57     return false;
  58
  59   // Those are internal requests, we do not need indirection
  60   // because those objects are copies:
  61   simgrid::kernel::activity::CommImpl* synchro1 = MC_get_comm(r1);
  62   simgrid::kernel::activity::CommImpl* synchro2 = MC_get_comm(r2);
  63
  64   if ((r1->call == SIMCALL_COMM_ISEND || r1->call == SIMCALL_COMM_IRECV)
  65       && r2->call == SIMCALL_COMM_WAIT) {
  66
  67     smx_mailbox_t mbox = MC_get_mbox(r1);
  68
  69     if (mbox != synchro2->mbox_cpy
  70         && simcall_comm_wait__get__timeout(r2) <= 0)
  71       return false;
  72
  73     if ((r1->issuer != synchro2->src_actor_.get()) && (r1->issuer != synchro2->dst_actor_.get()) &&
  74         simcall_comm_wait__get__timeout(r2) <= 0)
  75       return false;
  76
  77     if ((r1->call == SIMCALL_COMM_ISEND) && (synchro2->type_ == kernel::activity::CommImpl::Type::SEND) &&
  78         (synchro2->src_buff_ != simcall_comm_isend__get__src_buff(r1)) && simcall_comm_wait__get__timeout(r2) <= 0)
  79       return false;
  80
  81     if ((r1->call == SIMCALL_COMM_IRECV) && (synchro2->type_ == kernel::activity::CommImpl::Type::RECEIVE) &&
  82         (synchro2->dst_buff_ != simcall_comm_irecv__get__dst_buff(r1)) && simcall_comm_wait__get__timeout(r2) <= 0)
  83       return false;
  84   }
  85
  86   /* FIXME: the following rule assumes that the result of the
  87    * isend/irecv call is not stored in a buffer used in the
  88    * test call. */
  89 #if 0
  90   if((r1->call == SIMCALL_COMM_ISEND || r1->call == SIMCALL_COMM_IRECV)
  91      &&  r2->call == SIMCALL_COMM_TEST)
  92      return false;
  93 #endif
  94
  95   if (r1->call == SIMCALL_COMM_WAIT && (r2->call == SIMCALL_COMM_WAIT || r2->call == SIMCALL_COMM_TEST) &&
  96       (synchro1->src_actor_.get() == nullptr || synchro1->dst_actor_.get() == nullptr))
  97     return false;
  98
  99   if (r1->call == SIMCALL_COMM_TEST &&
 100       (simcall_comm_test__get__comm(r1) == nullptr || synchro1->src_buff_ == nullptr || synchro1->dst_buff_ == nullptr))
 101     return false;
 102
 103   if (r1->call == SIMCALL_COMM_TEST && r2->call == SIMCALL_COMM_WAIT && synchro1->src_buff_ == synchro2->src_buff_ &&
 104       synchro1->dst_buff_ == synchro2->dst_buff_)
 105     return false;
 106
 107   if (r1->call == SIMCALL_COMM_WAIT && r2->call == SIMCALL_COMM_TEST && synchro1->src_buff_ != nullptr &&
 108       synchro1->dst_buff_ != nullptr && synchro2->src_buff_ != nullptr && synchro2->dst_buff_ != nullptr &&
 109       synchro1->dst_buff_ != synchro2->src_buff_ && synchro1->dst_buff_ != synchro2->dst_buff_ &&
 110       synchro2->dst_buff_ != synchro1->src_buff_)
 111     return false;
 112
 113   return true;
 114 }
 115
 116 // Those are internal_req
 117 bool request_depend(smx_simcall_t req1, smx_simcall_t req2)
 118 {
 119   if (req1->issuer == req2->issuer)
 120     return false;
 121
 122   /* Wait with timeout transitions are not considered by the independence theorem, thus we consider them as dependent with all other transitions */
 123   if ((req1->call == SIMCALL_COMM_WAIT && simcall_comm_wait__get__timeout(req1) > 0) ||
 124       (req2->call == SIMCALL_COMM_WAIT && simcall_comm_wait__get__timeout(req2) > 0))
 125     return true;
 126
 127   if (req1->call != req2->call)
 128     return request_depend_asymmetric(req1, req2) && request_depend_asymmetric(req2, req1);
 129
 130   // Those are internal requests, we do not need indirection
 131   // because those objects are copies:
 132   simgrid::kernel::activity::CommImpl* synchro1 = MC_get_comm(req1);
 133   simgrid::kernel::activity::CommImpl* synchro2 = MC_get_comm(req2);
 134
 135   switch (req1->call) {
 136     case SIMCALL_COMM_ISEND:
 137       return simcall_comm_isend__get__mbox(req1) == simcall_comm_isend__get__mbox(req2);
 138     case SIMCALL_COMM_IRECV:
 139       return simcall_comm_irecv__get__mbox(req1) == simcall_comm_irecv__get__mbox(req2);
 140     case SIMCALL_COMM_WAIT:
 141       if (synchro1->src_buff_ == synchro2->src_buff_ && synchro1->dst_buff_ == synchro2->dst_buff_)
 142         return false;
 143       if (synchro1->src_buff_ != nullptr && synchro1->dst_buff_ != nullptr && synchro2->src_buff_ != nullptr &&
 144           synchro2->dst_buff_ != nullptr && synchro1->dst_buff_ != synchro2->src_buff_ &&
 145           synchro1->dst_buff_ != synchro2->dst_buff_ && synchro2->dst_buff_ != synchro1->src_buff_)
 146         return false;
 147       return true;
 148     default:
 149       return true;
 150   }
 151 }
 152
 153 }
 154 }
 155
 156 static char *pointer_to_string(void *pointer)
 157 {
 158
 159   if (XBT_LOG_ISENABLED(mc_request, xbt_log_priority_verbose))
 160     return bprintf("%p", pointer);
 161
 162   return xbt_strdup("(verbose only)");
 163 }
 164
 165 static char *buff_size_to_string(size_t buff_size)
 166 {
 167
 168   if (XBT_LOG_ISENABLED(mc_request, xbt_log_priority_verbose))
 169     return bprintf("%zu", buff_size);
 170
 171   return xbt_strdup("(verbose only)");
 172 }
 173
 174
 175 std::string simgrid::mc::request_to_string(smx_simcall_t req, int value, simgrid::mc::RequestType request_type)
 176 {
 177   xbt_assert(mc_model_checker != nullptr, "Must be called from MCer");
 178
 179   bool use_remote_comm = true;
 180   switch(request_type) {
 181   case simgrid::mc::RequestType::simix:
 182     use_remote_comm = true;
 183     break;
 184   case simgrid::mc::RequestType::executed:
 185   case simgrid::mc::RequestType::internal:
 186     use_remote_comm = false;
 187     break;
 188   default:
 189     THROW_IMPOSSIBLE;
 190   }
 191
 192   const char* type = nullptr;
 193   char *args = nullptr;
 194
 195   smx_actor_t issuer = MC_smx_simcall_get_issuer(req);
 196
 197   switch (req->call) {
 198
 199   case SIMCALL_COMM_ISEND: {
 200     type = "iSend";
 201     char* p = pointer_to_string(simcall_comm_isend__get__src_buff(req));
 202     char* bs = buff_size_to_string(simcall_comm_isend__get__src_buff_size(req));
 203     if (issuer->get_host())
 204       args = bprintf("src=(%ld)%s (%s), buff=%s, size=%s", issuer->get_pid(), MC_smx_actor_get_host_name(issuer),
 205                      MC_smx_actor_get_name(issuer), p, bs);
 206     else
 207       args = bprintf("src=(%ld)%s, buff=%s, size=%s", issuer->get_pid(), MC_smx_actor_get_name(issuer), p, bs);
 208     xbt_free(bs);
 209     xbt_free(p);
 210     break;
 211   }
 212
 213   case SIMCALL_COMM_IRECV: {
 214     size_t* remote_size = simcall_comm_irecv__get__dst_buff_size(req);
 215     size_t size = 0;
 216     if (remote_size)
 217       mc_model_checker->process().read_bytes(&size, sizeof(size),
 218         remote(remote_size));
 219
 220     type = "iRecv";
 221     char* p = pointer_to_string(simcall_comm_irecv__get__dst_buff(req));
 222     char* bs = buff_size_to_string(size);
 223     if (issuer->get_host())
 224       args = bprintf("dst=(%ld)%s (%s), buff=%s, size=%s", issuer->get_pid(), MC_smx_actor_get_host_name(issuer),
 225                      MC_smx_actor_get_name(issuer), p, bs);
 226     else
 227       args = bprintf("dst=(%ld)%s, buff=%s, size=%s", issuer->get_pid(), MC_smx_actor_get_name(issuer), p, bs);
 228     xbt_free(bs);
 229     xbt_free(p);
 230     break;
 231   }
 232
 233   case SIMCALL_COMM_WAIT: {
 234     simgrid::kernel::activity::CommImpl* remote_act =
 235         static_cast<simgrid::kernel::activity::CommImpl*>(simcall_comm_wait__getraw__comm(req));
 236     char* p;
 237     if (value == -1) {
 238       type = "WaitTimeout";
 239       p = pointer_to_string(remote_act);
 240       args = bprintf("comm=%s", p);
 241     } else {
 242       type = "Wait";
 243       p = pointer_to_string(remote_act);
 244
 245       simgrid::mc::Remote<simgrid::kernel::activity::CommImpl> temp_synchro;
 246       simgrid::kernel::activity::CommImpl* act;
 247       if (use_remote_comm) {
 248         mc_model_checker->process().read(temp_synchro,
 249                                          remote(static_cast<simgrid::kernel::activity::CommImpl*>(remote_act)));
 250         act = temp_synchro.get_buffer();
 251       } else
 252         act = remote_act;
 253
 254       smx_actor_t src_proc = mc_model_checker->process().resolve_actor(simgrid::mc::remote(act->src_actor_.get()));
 255       smx_actor_t dst_proc = mc_model_checker->process().resolve_actor(simgrid::mc::remote(act->dst_actor_.get()));
 256       args =
 257           bprintf("comm=%s [(%ld)%s (%s)-> (%ld)%s (%s)]", p, src_proc ? src_proc->get_pid() : 0,
 258                   src_proc ? MC_smx_actor_get_host_name(src_proc) : "", src_proc ? MC_smx_actor_get_name(src_proc) : "",
 259                   dst_proc ? dst_proc->get_pid() : 0, dst_proc ? MC_smx_actor_get_host_name(dst_proc) : "",
 260                   dst_proc ? MC_smx_actor_get_name(dst_proc) : "");
 261     }
 262     xbt_free(p);
 263     break;
 264   }
 265
 266   case SIMCALL_COMM_TEST: {
 267     simgrid::kernel::activity::CommImpl* remote_act =
 268         static_cast<simgrid::kernel::activity::CommImpl*>(simcall_comm_test__getraw__comm(req));
 269     simgrid::mc::Remote<simgrid::kernel::activity::CommImpl> temp_synchro;
 270     simgrid::kernel::activity::CommImpl* act;
 271     if (use_remote_comm) {
 272       mc_model_checker->process().read(temp_synchro,
 273                                        remote(static_cast<simgrid::kernel::activity::CommImpl*>(remote_act)));
 274       act = temp_synchro.get_buffer();
 275     } else
 276       act = remote_act;
 277
 278     char* p;
 279     if (act->src_actor_.get() == nullptr || act->dst_actor_.get() == nullptr) {
 280       type = "Test FALSE";
 281       p = pointer_to_string(remote_act);
 282       args = bprintf("comm=%s", p);
 283     } else {
 284       type = "Test TRUE";
 285       p = pointer_to_string(remote_act);
 286
 287       smx_actor_t src_proc = mc_model_checker->process().resolve_actor(simgrid::mc::remote(act->src_actor_.get()));
 288       smx_actor_t dst_proc = mc_model_checker->process().resolve_actor(simgrid::mc::remote(act->dst_actor_.get()));
 289       args = bprintf("comm=%s [(%ld)%s (%s) -> (%ld)%s (%s)]", p, src_proc->get_pid(), MC_smx_actor_get_name(src_proc),
 290                      MC_smx_actor_get_host_name(src_proc), dst_proc->get_pid(), MC_smx_actor_get_name(dst_proc),
 291                      MC_smx_actor_get_host_name(dst_proc));
 292     }
 293     xbt_free(p);
 294     break;
 295   }
 296
 297   case SIMCALL_COMM_WAITANY: {
 298     type = "WaitAny";
 299     size_t count = simcall_comm_waitany__get__count(req);
 300     if (count > 0) {
 301       simgrid::kernel::activity::CommImpl* remote_sync;
 302       remote_sync = mc_model_checker->process().read(remote(simcall_comm_waitany__get__comms(req) + value));
 303       char* p     = pointer_to_string(remote_sync);
 304       args        = bprintf("comm=%s (%d of %zu)", p, value + 1, count);
 305       xbt_free(p);
 306     } else
 307       args = bprintf("comm at idx %d", value);
 308     break;
 309   }
 310
 311   case SIMCALL_COMM_TESTANY:
 312     if (value == -1) {
 313       type = "TestAny FALSE";
 314       args = xbt_strdup("-");
 315     } else {
 316       type = "TestAny";
 317       args =
 318           bprintf("(%d of %zu)", value + 1,
 319                     simcall_comm_testany__get__count(req));
 320     }
 321     break;
 322
 323   case SIMCALL_MUTEX_TRYLOCK:
 324   case SIMCALL_MUTEX_LOCK: {
 325     if (req->call == SIMCALL_MUTEX_LOCK)
 326       type = "Mutex LOCK";
 327     else
 328       type = "Mutex TRYLOCK";
 329
 330     simgrid::mc::Remote<simgrid::kernel::activity::MutexImpl> mutex;
 331     mc_model_checker->process().read_bytes(mutex.get_buffer(), sizeof(mutex),
 332                                            remote(req->call == SIMCALL_MUTEX_LOCK
 333                                                       ? simcall_mutex_lock__get__mutex(req)
 334                                                       : simcall_mutex_trylock__get__mutex(req)));
 335     args = bprintf(
 336         "locked = %d, owner = %d, sleeping = n/a", mutex.get_buffer()->is_locked(),
 337         mutex.get_buffer()->owner_ != nullptr
 338             ? (int)mc_model_checker->process().resolve_actor(simgrid::mc::remote(mutex.get_buffer()->owner_))->get_pid()
 339             : -1);
 340     break;
 341   }
 342
 343   case SIMCALL_MC_RANDOM:
 344     type = "MC_RANDOM";
 345     args = bprintf("%d", value);
 346     break;
 347
 348   default:
 349     type = SIMIX_simcall_name(req->call);
 350     args = bprintf("??");
 351     break;
 352   }
 353
 354   std::string str;
 355   if (args != nullptr)
 356     str = simgrid::xbt::string_printf("[(%ld)%s (%s)] %s(%s)", issuer->get_pid(), MC_smx_actor_get_host_name(issuer),
 357                                       MC_smx_actor_get_name(issuer), type, args);
 358   else
 359     str = simgrid::xbt::string_printf("[(%ld)%s (%s)] %s ", issuer->get_pid(), MC_smx_actor_get_host_name(issuer),
 360                                       MC_smx_actor_get_name(issuer), type);
 361   xbt_free(args);
 362   return str;
 363 }
 364
 365 namespace simgrid {
 366 namespace mc {
 367
 368 bool request_is_enabled_by_idx(smx_simcall_t req, unsigned int idx)
 369 {
 370   simgrid::kernel::activity::CommImpl* remote_act = nullptr;
 371   switch (req->call) {
 372
 373   case SIMCALL_COMM_WAIT:
 374     /* FIXME: check also that src and dst processes are not suspended */
 375     remote_act = simcall_comm_wait__getraw__comm(req);
 376     break;
 377
 378   case SIMCALL_COMM_WAITANY:
 379     remote_act = mc_model_checker->process().read(remote(simcall_comm_testany__get__comms(req) + idx));
 380     break;
 381
 382   case SIMCALL_COMM_TESTANY:
 383     remote_act = mc_model_checker->process().read(remote(simcall_comm_testany__get__comms(req) + idx));
 384     break;
 385
 386   default:
 387     return true;
 388   }
 389
 390   simgrid::mc::Remote<simgrid::kernel::activity::CommImpl> temp_comm;
 391   mc_model_checker->process().read(temp_comm, remote(remote_act));
 392   simgrid::kernel::activity::CommImpl* comm = temp_comm.get_buffer();
 393   return comm->src_actor_.get() && comm->dst_actor_.get();
 394 }
 395
 396
 397 static const char* colors[] = {
 398   "blue",
 399   "red",
 400   "green3",
 401   "goldenrod",
 402   "brown",
 403   "purple",
 404   "magenta",
 405   "turquoise4",
 406   "gray25",
 407   "forestgreen",
 408   "hotpink",
 409   "lightblue",
 410   "tan",
 411 };
 412
 413 static inline const char* get_color(int id)
 414 {
 415   return colors[id % (sizeof(colors) / sizeof(colors[0])) ];
 416 }
 417
 418 std::string request_get_dot_output(smx_simcall_t req, int value)
 419 {
 420   std::string label;
 421
 422   const smx_actor_t issuer = MC_smx_simcall_get_issuer(req);
 423
 424   switch (req->call) {
 425   case SIMCALL_COMM_ISEND:
 426     if (issuer->get_host())
 427       label = simgrid::xbt::string_printf("[(%ld)%s] iSend", issuer->get_pid(), MC_smx_actor_get_host_name(issuer));
 428     else
 429       label = bprintf("[(%ld)] iSend", issuer->get_pid());
 430     break;
 431
 432   case SIMCALL_COMM_IRECV:
 433     if (issuer->get_host())
 434       label = simgrid::xbt::string_printf("[(%ld)%s] iRecv", issuer->get_pid(), MC_smx_actor_get_host_name(issuer));
 435     else
 436       label = simgrid::xbt::string_printf("[(%ld)] iRecv", issuer->get_pid());
 437     break;
 438
 439   case SIMCALL_COMM_WAIT:
 440     if (value == -1) {
 441       if (issuer->get_host())
 442         label =
 443             simgrid::xbt::string_printf("[(%ld)%s] WaitTimeout", issuer->get_pid(), MC_smx_actor_get_host_name(issuer));
 444       else
 445         label = simgrid::xbt::string_printf("[(%ld)] WaitTimeout", issuer->get_pid());
 446     } else {
 447       simgrid::kernel::activity::ActivityImpl* remote_act = simcall_comm_wait__getraw__comm(req);
 448       simgrid::mc::Remote<simgrid::kernel::activity::CommImpl> temp_comm;
 449       mc_model_checker->process().read(temp_comm,
 450                                        remote(static_cast<simgrid::kernel::activity::CommImpl*>(remote_act)));
 451       simgrid::kernel::activity::CommImpl* comm = temp_comm.get_buffer();
 452
 453       smx_actor_t src_proc = mc_model_checker->process().resolve_actor(simgrid::mc::remote(comm->src_actor_.get()));
 454       smx_actor_t dst_proc = mc_model_checker->process().resolve_actor(simgrid::mc::remote(comm->dst_actor_.get()));
 455       if (issuer->get_host())
 456         label = simgrid::xbt::string_printf("[(%ld)%s] Wait [(%ld)->(%ld)]", issuer->get_pid(),
 457                                             MC_smx_actor_get_host_name(issuer), src_proc ? src_proc->get_pid() : 0,
 458                                             dst_proc ? dst_proc->get_pid() : 0);
 459       else
 460         label = simgrid::xbt::string_printf("[(%ld)] Wait [(%ld)->(%ld)]", issuer->get_pid(),
 461                                             src_proc ? src_proc->get_pid() : 0, dst_proc ? dst_proc->get_pid() : 0);
 462     }
 463     break;
 464
 465   case SIMCALL_COMM_TEST: {
 466     simgrid::kernel::activity::ActivityImpl* remote_act = simcall_comm_test__getraw__comm(req);
 467     simgrid::mc::Remote<simgrid::kernel::activity::CommImpl> temp_comm;
 468     mc_model_checker->process().read(temp_comm, remote(static_cast<simgrid::kernel::activity::CommImpl*>(remote_act)));
 469     simgrid::kernel::activity::CommImpl* comm = temp_comm.get_buffer();
 470     if (comm->src_actor_.get() == nullptr || comm->dst_actor_.get() == nullptr) {
 471       if (issuer->get_host())
 472         label =
 473             simgrid::xbt::string_printf("[(%ld)%s] Test FALSE", issuer->get_pid(), MC_smx_actor_get_host_name(issuer));
 474       else
 475         label = bprintf("[(%ld)] Test FALSE", issuer->get_pid());
 476     } else {
 477       if (issuer->get_host())
 478         label =
 479             simgrid::xbt::string_printf("[(%ld)%s] Test TRUE", issuer->get_pid(), MC_smx_actor_get_host_name(issuer));
 480       else
 481         label = simgrid::xbt::string_printf("[(%ld)] Test TRUE", issuer->get_pid());
 482     }
 483     break;
 484   }
 485
 486   case SIMCALL_COMM_WAITANY: {
 487     size_t comms_size = simcall_comm_waitany__get__count(req);
 488     if (issuer->get_host())
 489       label = simgrid::xbt::string_printf("[(%ld)%s] WaitAny [%d of %zu]", issuer->get_pid(),
 490                                           MC_smx_actor_get_host_name(issuer), value + 1, comms_size);
 491     else
 492       label = simgrid::xbt::string_printf("[(%ld)] WaitAny [%d of %zu]", issuer->get_pid(), value + 1, comms_size);
 493     break;
 494   }
 495
 496   case SIMCALL_COMM_TESTANY:
 497     if (value == -1) {
 498       if (issuer->get_host())
 499         label = simgrid::xbt::string_printf("[(%ld)%s] TestAny FALSE", issuer->get_pid(),
 500                                             MC_smx_actor_get_host_name(issuer));
 501       else
 502         label = simgrid::xbt::string_printf("[(%ld)] TestAny FALSE", issuer->get_pid());
 503     } else {
 504       if (issuer->get_host())
 505         label = simgrid::xbt::string_printf("[(%ld)%s] TestAny TRUE [%d of %lu]", issuer->get_pid(),
 506                                             MC_smx_actor_get_host_name(issuer), value + 1,
 507                                             simcall_comm_testany__get__count(req));
 508       else
 509         label = simgrid::xbt::string_printf("[(%ld)] TestAny TRUE [%d of %lu]", issuer->get_pid(), value + 1,
 510                                             simcall_comm_testany__get__count(req));
 511     }
 512     break;
 513
 514   case SIMCALL_MUTEX_TRYLOCK:
 515     label = simgrid::xbt::string_printf("[(%ld)] Mutex TRYLOCK", issuer->get_pid());
 516     break;
 517
 518   case SIMCALL_MUTEX_LOCK:
 519     label = simgrid::xbt::string_printf("[(%ld)] Mutex LOCK", issuer->get_pid());
 520     break;
 521
 522   case SIMCALL_MC_RANDOM:
 523     if (issuer->get_host())
 524       label = simgrid::xbt::string_printf("[(%ld)%s] MC_RANDOM (%d)", issuer->get_pid(),
 525                                           MC_smx_actor_get_host_name(issuer), value);
 526     else
 527       label = simgrid::xbt::string_printf("[(%ld)] MC_RANDOM (%d)", issuer->get_pid(), value);
 528     break;
 529
 530   default:
 531     THROW_UNIMPLEMENTED;
 532   }
 533
 534   const char* color = get_color(issuer->get_pid() - 1);
 535   return  simgrid::xbt::string_printf(
 536         "label = \"%s\", color = %s, fontcolor = %s", label.c_str(),
 537         color, color);
 538 }
 539
 540 }
 541 }