src/mc/mc_request.cpp

   1 /* Copyright (c) 2008-2020. 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/checker/SimcallInspector.hpp"
  12 #include "src/mc/mc_smx.hpp"
  13
  14 using simgrid::mc::remote;
  15
  16 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_request, mc, "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 simcall_comm_wait__getraw__comm(r);
  26     case SIMCALL_COMM_TEST:
  27       return 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 because those objects are copies:
  60   const kernel::activity::CommImpl* synchro1 = MC_get_comm(r1);
  61   const kernel::activity::CommImpl* synchro2 = MC_get_comm(r2);
  62
  63   if ((r1->call_ == SIMCALL_COMM_ISEND || r1->call_ == SIMCALL_COMM_IRECV) && r2->call_ == SIMCALL_COMM_WAIT) {
  64     const kernel::activity::MailboxImpl* mbox = MC_get_mbox(r1);
  65
  66     if (mbox != synchro2->mbox_cpy
  67         && simcall_comm_wait__get__timeout(r2) <= 0)
  68       return false;
  69
  70     if ((r1->issuer_ != synchro2->src_actor_.get()) && (r1->issuer_ != synchro2->dst_actor_.get()) &&
  71         simcall_comm_wait__get__timeout(r2) <= 0)
  72       return false;
  73
  74     if ((r1->call_ == SIMCALL_COMM_ISEND) && (synchro2->type_ == kernel::activity::CommImpl::Type::SEND) &&
  75         (synchro2->src_buff_ != simcall_comm_isend__get__src_buff(r1)) && simcall_comm_wait__get__timeout(r2) <= 0)
  76       return false;
  77
  78     if ((r1->call_ == SIMCALL_COMM_IRECV) && (synchro2->type_ == kernel::activity::CommImpl::Type::RECEIVE) &&
  79         (synchro2->dst_buff_ != simcall_comm_irecv__get__dst_buff(r1)) && simcall_comm_wait__get__timeout(r2) <= 0)
  80       return false;
  81   }
  82
  83   /* FIXME: the following rule assumes that the result of the isend/irecv call is not stored in a buffer used in the
  84    * test call. */
  85 #if 0
  86   if((r1->call == SIMCALL_COMM_ISEND || r1->call == SIMCALL_COMM_IRECV)
  87       &&  r2->call == SIMCALL_COMM_TEST)
  88     return false;
  89 #endif
  90
  91   if (r1->call_ == SIMCALL_COMM_WAIT && (r2->call_ == SIMCALL_COMM_WAIT || r2->call_ == SIMCALL_COMM_TEST) &&
  92       (synchro1->src_actor_.get() == nullptr || synchro1->dst_actor_.get() == nullptr))
  93     return false;
  94
  95   if (r1->call_ == SIMCALL_COMM_TEST &&
  96       (simcall_comm_test__get__comm(r1) == nullptr || synchro1->src_buff_ == nullptr || synchro1->dst_buff_ == nullptr))
  97     return false;
  98
  99   if (r1->call_ == SIMCALL_COMM_TEST && r2->call_ == SIMCALL_COMM_WAIT && synchro1->src_buff_ == synchro2->src_buff_ &&
 100       synchro1->dst_buff_ == synchro2->dst_buff_)
 101     return false;
 102
 103   if (r1->call_ == SIMCALL_COMM_WAIT && r2->call_ == SIMCALL_COMM_TEST && synchro1->src_buff_ != nullptr &&
 104       synchro1->dst_buff_ != nullptr && synchro2->src_buff_ != nullptr && synchro2->dst_buff_ != nullptr &&
 105       synchro1->dst_buff_ != synchro2->src_buff_ && synchro1->dst_buff_ != synchro2->dst_buff_ &&
 106       synchro2->dst_buff_ != synchro1->src_buff_)
 107     return false;
 108
 109   return true;
 110 }
 111
 112 // Those are internal_req
 113 bool request_depend(smx_simcall_t req1, smx_simcall_t req2)
 114 {
 115   if (req1->issuer_ == req2->issuer_)
 116     return false;
 117
 118   /* Wait with timeout transitions are not considered by the independence theorem, thus we consider them as dependent with all other transitions */
 119   if ((req1->call_ == SIMCALL_COMM_WAIT && simcall_comm_wait__get__timeout(req1) > 0) ||
 120       (req2->call_ == SIMCALL_COMM_WAIT && simcall_comm_wait__get__timeout(req2) > 0))
 121     return true;
 122
 123   if (req1->call_ != req2->call_)
 124     return request_depend_asymmetric(req1, req2) && request_depend_asymmetric(req2, req1);
 125
 126   // Those are internal requests, we do not need indirection because those objects are copies:
 127   const kernel::activity::CommImpl* synchro1 = MC_get_comm(req1);
 128   const kernel::activity::CommImpl* synchro2 = MC_get_comm(req2);
 129
 130   switch (req1->call_) {
 131     case SIMCALL_COMM_ISEND:
 132       return simcall_comm_isend__get__mbox(req1) == simcall_comm_isend__get__mbox(req2);
 133     case SIMCALL_COMM_IRECV:
 134       return simcall_comm_irecv__get__mbox(req1) == simcall_comm_irecv__get__mbox(req2);
 135     case SIMCALL_COMM_WAIT:
 136       if (synchro1->src_buff_ == synchro2->src_buff_ && synchro1->dst_buff_ == synchro2->dst_buff_)
 137         return false;
 138       if (synchro1->src_buff_ != nullptr && synchro1->dst_buff_ != nullptr && synchro2->src_buff_ != nullptr &&
 139           synchro2->dst_buff_ != nullptr && synchro1->dst_buff_ != synchro2->src_buff_ &&
 140           synchro1->dst_buff_ != synchro2->dst_buff_ && synchro2->dst_buff_ != synchro1->src_buff_)
 141         return false;
 142       return true;
 143     default:
 144       return true;
 145   }
 146 }
 147
 148 } // namespace mc
 149 } // namespace simgrid
 150
 151 static char *pointer_to_string(void *pointer)
 152 {
 153   if (XBT_LOG_ISENABLED(mc_request, xbt_log_priority_verbose))
 154     return bprintf("%p", pointer);
 155
 156   return xbt_strdup("(verbose only)");
 157 }
 158
 159 static char *buff_size_to_string(size_t buff_size)
 160 {
 161   if (XBT_LOG_ISENABLED(mc_request, xbt_log_priority_verbose))
 162     return bprintf("%zu", buff_size);
 163
 164   return xbt_strdup("(verbose only)");
 165 }
 166
 167
 168 std::string simgrid::mc::request_to_string(smx_simcall_t req, int value, simgrid::mc::RequestType request_type)
 169 {
 170   xbt_assert(mc_model_checker != nullptr, "Must be called from MCer");
 171
 172   if (req->inspector_ != nullptr)
 173     return req->inspector_->to_string();
 174
 175   bool use_remote_comm = true;
 176   switch(request_type) {
 177   case simgrid::mc::RequestType::simix:
 178     use_remote_comm = true;
 179     break;
 180   case simgrid::mc::RequestType::executed:
 181   case simgrid::mc::RequestType::internal:
 182     use_remote_comm = false;
 183     break;
 184   default:
 185     THROW_IMPOSSIBLE;
 186   }
 187
 188   const char* type = nullptr;
 189   char *args = nullptr;
 190
 191   smx_actor_t issuer = MC_smx_simcall_get_issuer(req);
 192
 193   switch (req->call_) {
 194     case SIMCALL_COMM_ISEND: {
 195       type     = "iSend";
 196       char* p  = pointer_to_string(simcall_comm_isend__get__src_buff(req));
 197       char* bs = buff_size_to_string(simcall_comm_isend__get__src_buff_size(req));
 198       if (issuer->get_host())
 199         args = bprintf("src=(%ld)%s (%s), buff=%s, size=%s", issuer->get_pid(), MC_smx_actor_get_host_name(issuer),
 200                        MC_smx_actor_get_name(issuer), p, bs);
 201       else
 202         args = bprintf("src=(%ld)%s, buff=%s, size=%s", issuer->get_pid(), MC_smx_actor_get_name(issuer), p, bs);
 203       xbt_free(bs);
 204       xbt_free(p);
 205       break;
 206     }
 207
 208     case SIMCALL_COMM_IRECV: {
 209       size_t* remote_size = simcall_comm_irecv__get__dst_buff_size(req);
 210       size_t size         = 0;
 211       if (remote_size)
 212         mc_model_checker->get_remote_simulation().read_bytes(&size, sizeof(size), remote(remote_size));
 213
 214       type     = "iRecv";
 215       char* p  = pointer_to_string(simcall_comm_irecv__get__dst_buff(req));
 216       char* bs = buff_size_to_string(size);
 217       if (issuer->get_host())
 218         args = bprintf("dst=(%ld)%s (%s), buff=%s, size=%s", issuer->get_pid(), MC_smx_actor_get_host_name(issuer),
 219                        MC_smx_actor_get_name(issuer), p, bs);
 220       else
 221         args = bprintf("dst=(%ld)%s, buff=%s, size=%s", issuer->get_pid(), MC_smx_actor_get_name(issuer), p, bs);
 222       xbt_free(bs);
 223       xbt_free(p);
 224       break;
 225     }
 226
 227     case SIMCALL_COMM_WAIT: {
 228       simgrid::kernel::activity::CommImpl* remote_act = simcall_comm_wait__getraw__comm(req);
 229       char* p;
 230       if (value == -1) {
 231         type = "WaitTimeout";
 232         p    = pointer_to_string(remote_act);
 233         args = bprintf("comm=%s", p);
 234       } else {
 235         type = "Wait";
 236         p    = pointer_to_string(remote_act);
 237
 238         simgrid::mc::Remote<simgrid::kernel::activity::CommImpl> temp_synchro;
 239         const simgrid::kernel::activity::CommImpl* act;
 240         if (use_remote_comm) {
 241           mc_model_checker->get_remote_simulation().read(temp_synchro, remote(remote_act));
 242           act = temp_synchro.get_buffer();
 243         } else
 244           act = remote_act;
 245
 246         smx_actor_t src_proc =
 247             mc_model_checker->get_remote_simulation().resolve_actor(simgrid::mc::remote(act->src_actor_.get()));
 248         smx_actor_t dst_proc =
 249             mc_model_checker->get_remote_simulation().resolve_actor(simgrid::mc::remote(act->dst_actor_.get()));
 250         args                 = bprintf("comm=%s [(%ld)%s (%s)-> (%ld)%s (%s)]", p, src_proc ? src_proc->get_pid() : 0,
 251                        src_proc ? MC_smx_actor_get_host_name(src_proc) : "",
 252                        src_proc ? MC_smx_actor_get_name(src_proc) : "", dst_proc ? dst_proc->get_pid() : 0,
 253                        dst_proc ? MC_smx_actor_get_host_name(dst_proc) : "",
 254                        dst_proc ? MC_smx_actor_get_name(dst_proc) : "");
 255       }
 256       xbt_free(p);
 257       break;
 258     }
 259
 260     case SIMCALL_COMM_TEST: {
 261       simgrid::kernel::activity::CommImpl* remote_act = simcall_comm_test__getraw__comm(req);
 262       simgrid::mc::Remote<simgrid::kernel::activity::CommImpl> temp_synchro;
 263       const simgrid::kernel::activity::CommImpl* act;
 264       if (use_remote_comm) {
 265         mc_model_checker->get_remote_simulation().read(temp_synchro, remote(remote_act));
 266         act = temp_synchro.get_buffer();
 267       } else
 268         act = remote_act;
 269
 270       char* p;
 271       if (act->src_actor_.get() == nullptr || act->dst_actor_.get() == nullptr) {
 272         type = "Test FALSE";
 273         p    = pointer_to_string(remote_act);
 274         args = bprintf("comm=%s", p);
 275       } else {
 276         type = "Test TRUE";
 277         p    = pointer_to_string(remote_act);
 278
 279         smx_actor_t src_proc =
 280             mc_model_checker->get_remote_simulation().resolve_actor(simgrid::mc::remote(act->src_actor_.get()));
 281         smx_actor_t dst_proc =
 282             mc_model_checker->get_remote_simulation().resolve_actor(simgrid::mc::remote(act->dst_actor_.get()));
 283         args                 = bprintf("comm=%s [(%ld)%s (%s) -> (%ld)%s (%s)]", p, src_proc->get_pid(),
 284                        MC_smx_actor_get_name(src_proc), MC_smx_actor_get_host_name(src_proc), dst_proc->get_pid(),
 285                        MC_smx_actor_get_name(dst_proc), MC_smx_actor_get_host_name(dst_proc));
 286       }
 287       xbt_free(p);
 288       break;
 289     }
 290
 291     case SIMCALL_COMM_WAITANY: {
 292       type         = "WaitAny";
 293       size_t count = simcall_comm_waitany__get__count(req);
 294       if (count > 0) {
 295         simgrid::kernel::activity::CommImpl* remote_sync;
 296         remote_sync =
 297             mc_model_checker->get_remote_simulation().read(remote(simcall_comm_waitany__get__comms(req) + value));
 298         char* p     = pointer_to_string(remote_sync);
 299         args        = bprintf("comm=%s (%d of %zu)", p, value + 1, count);
 300         xbt_free(p);
 301       } else
 302         args = bprintf("comm at idx %d", value);
 303       break;
 304     }
 305
 306     case SIMCALL_COMM_TESTANY:
 307       if (value == -1) {
 308         type = "TestAny FALSE";
 309         args = xbt_strdup("-");
 310       } else {
 311         type = "TestAny";
 312         args = bprintf("(%d of %zu)", value + 1, simcall_comm_testany__get__count(req));
 313       }
 314       break;
 315
 316     case SIMCALL_MUTEX_TRYLOCK:
 317     case SIMCALL_MUTEX_LOCK: {
 318       if (req->call_ == SIMCALL_MUTEX_LOCK)
 319         type = "Mutex LOCK";
 320       else
 321         type = "Mutex TRYLOCK";
 322
 323       simgrid::mc::Remote<simgrid::kernel::activity::MutexImpl> mutex;
 324       mc_model_checker->get_remote_simulation().read_bytes(mutex.get_buffer(), sizeof(mutex),
 325                                                            remote(req->call_ == SIMCALL_MUTEX_LOCK
 326                                                                       ? simcall_mutex_lock__get__mutex(req)
 327                                                                       : simcall_mutex_trylock__get__mutex(req)));
 328       args = bprintf("locked = %d, owner = %d, sleeping = n/a", mutex.get_buffer()->is_locked(),
 329                      mutex.get_buffer()->get_owner() != nullptr
 330                          ? (int)mc_model_checker->get_remote_simulation()
 331                                .resolve_actor(simgrid::mc::remote(mutex.get_buffer()->get_owner()))
 332                                ->get_pid()
 333                          : -1);
 334       break;
 335     }
 336
 337     case SIMCALL_MC_RANDOM:
 338       type = "MC_RANDOM";
 339       args = bprintf("%d", value);
 340       break;
 341
 342     default:
 343       type = SIMIX_simcall_name(req->call_);
 344       args = bprintf("??");
 345       break;
 346   }
 347
 348   std::string str;
 349   if (args != nullptr)
 350     str = simgrid::xbt::string_printf("[(%ld)%s (%s)] %s(%s)", issuer->get_pid(), MC_smx_actor_get_host_name(issuer),
 351                                       MC_smx_actor_get_name(issuer), type, args);
 352   else
 353     str = simgrid::xbt::string_printf("[(%ld)%s (%s)] %s ", issuer->get_pid(), MC_smx_actor_get_host_name(issuer),
 354                                       MC_smx_actor_get_name(issuer), type);
 355   xbt_free(args);
 356   return str;
 357 }
 358
 359 namespace simgrid {
 360 namespace mc {
 361
 362 bool request_is_enabled_by_idx(smx_simcall_t req, unsigned int idx)
 363 {
 364   kernel::activity::CommImpl* remote_act = nullptr;
 365   switch (req->call_) {
 366     case SIMCALL_COMM_WAIT:
 367       /* FIXME: check also that src and dst processes are not suspended */
 368       remote_act = simcall_comm_wait__getraw__comm(req);
 369       break;
 370
 371     case SIMCALL_COMM_WAITANY:
 372       remote_act = mc_model_checker->get_remote_simulation().read(remote(simcall_comm_testany__get__comms(req) + idx));
 373       break;
 374
 375     case SIMCALL_COMM_TESTANY:
 376       remote_act = mc_model_checker->get_remote_simulation().read(remote(simcall_comm_testany__get__comms(req) + idx));
 377       break;
 378
 379     default:
 380       return true;
 381   }
 382
 383   Remote<kernel::activity::CommImpl> temp_comm;
 384   mc_model_checker->get_remote_simulation().read(temp_comm, remote(remote_act));
 385   const kernel::activity::CommImpl* comm = temp_comm.get_buffer();
 386   return comm->src_actor_.get() && comm->dst_actor_.get();
 387 }
 388
 389 static const char* colors[] = {
 390     "blue",       "red",    "green3",      "goldenrod", "brown",     "purple", "magenta",
 391     "turquoise4", "gray25", "forestgreen", "hotpink",   "lightblue", "tan",
 392 };
 393
 394 static inline const char* get_color(int id)
 395 {
 396   return colors[id % (sizeof(colors) / sizeof(colors[0])) ];
 397 }
 398
 399 std::string request_get_dot_output(smx_simcall_t req, int value)
 400 {
 401   const smx_actor_t issuer = MC_smx_simcall_get_issuer(req);
 402   const char* color        = get_color(issuer->get_pid() - 1);
 403
 404   if (req->inspector_ != nullptr)
 405     return simgrid::xbt::string_printf("label = \"%s\", color = %s, fontcolor = %s",
 406                                        req->inspector_->dot_label().c_str(), color, color);
 407
 408   std::string label;
 409
 410   switch (req->call_) {
 411     case SIMCALL_COMM_ISEND:
 412       if (issuer->get_host())
 413         label = xbt::string_printf("[(%ld)%s] iSend", issuer->get_pid(), MC_smx_actor_get_host_name(issuer));
 414       else
 415         label = bprintf("[(%ld)] iSend", issuer->get_pid());
 416       break;
 417
 418     case SIMCALL_COMM_IRECV:
 419       if (issuer->get_host())
 420         label = xbt::string_printf("[(%ld)%s] iRecv", issuer->get_pid(), MC_smx_actor_get_host_name(issuer));
 421       else
 422         label = xbt::string_printf("[(%ld)] iRecv", issuer->get_pid());
 423       break;
 424
 425     case SIMCALL_COMM_WAIT:
 426       if (value == -1) {
 427         if (issuer->get_host())
 428           label = xbt::string_printf("[(%ld)%s] WaitTimeout", issuer->get_pid(), MC_smx_actor_get_host_name(issuer));
 429         else
 430           label = xbt::string_printf("[(%ld)] WaitTimeout", issuer->get_pid());
 431       } else {
 432         kernel::activity::ActivityImpl* remote_act = simcall_comm_wait__getraw__comm(req);
 433         Remote<kernel::activity::CommImpl> temp_comm;
 434         mc_model_checker->get_remote_simulation().read(temp_comm,
 435                                                        remote(static_cast<kernel::activity::CommImpl*>(remote_act)));
 436         const kernel::activity::CommImpl* comm = temp_comm.get_buffer();
 437
 438         const kernel::actor::ActorImpl* src_proc =
 439             mc_model_checker->get_remote_simulation().resolve_actor(mc::remote(comm->src_actor_.get()));
 440         const kernel::actor::ActorImpl* dst_proc =
 441             mc_model_checker->get_remote_simulation().resolve_actor(mc::remote(comm->dst_actor_.get()));
 442         if (issuer->get_host())
 443           label =
 444               xbt::string_printf("[(%ld)%s] Wait [(%ld)->(%ld)]", issuer->get_pid(), MC_smx_actor_get_host_name(issuer),
 445                                  src_proc ? src_proc->get_pid() : 0, dst_proc ? dst_proc->get_pid() : 0);
 446         else
 447           label = xbt::string_printf("[(%ld)] Wait [(%ld)->(%ld)]", issuer->get_pid(),
 448                                      src_proc ? src_proc->get_pid() : 0, dst_proc ? dst_proc->get_pid() : 0);
 449       }
 450       break;
 451
 452     case SIMCALL_COMM_TEST: {
 453       kernel::activity::ActivityImpl* remote_act = simcall_comm_test__getraw__comm(req);
 454       Remote<simgrid::kernel::activity::CommImpl> temp_comm;
 455       mc_model_checker->get_remote_simulation().read(temp_comm,
 456                                                      remote(static_cast<kernel::activity::CommImpl*>(remote_act)));
 457       const kernel::activity::CommImpl* comm = temp_comm.get_buffer();
 458       if (comm->src_actor_.get() == nullptr || comm->dst_actor_.get() == nullptr) {
 459         if (issuer->get_host())
 460           label = xbt::string_printf("[(%ld)%s] Test FALSE", issuer->get_pid(), MC_smx_actor_get_host_name(issuer));
 461         else
 462           label = bprintf("[(%ld)] Test FALSE", issuer->get_pid());
 463       } else {
 464         if (issuer->get_host())
 465           label = xbt::string_printf("[(%ld)%s] Test TRUE", issuer->get_pid(), MC_smx_actor_get_host_name(issuer));
 466         else
 467           label = xbt::string_printf("[(%ld)] Test TRUE", issuer->get_pid());
 468       }
 469       break;
 470     }
 471
 472     case SIMCALL_COMM_WAITANY: {
 473       size_t comms_size = simcall_comm_waitany__get__count(req);
 474       if (issuer->get_host())
 475         label = xbt::string_printf("[(%ld)%s] WaitAny [%d of %zu]", issuer->get_pid(),
 476                                    MC_smx_actor_get_host_name(issuer), value + 1, comms_size);
 477       else
 478         label = xbt::string_printf("[(%ld)] WaitAny [%d of %zu]", issuer->get_pid(), value + 1, comms_size);
 479       break;
 480     }
 481
 482     case SIMCALL_COMM_TESTANY:
 483       if (value == -1) {
 484         if (issuer->get_host())
 485           label = xbt::string_printf("[(%ld)%s] TestAny FALSE", issuer->get_pid(), MC_smx_actor_get_host_name(issuer));
 486         else
 487           label = xbt::string_printf("[(%ld)] TestAny FALSE", issuer->get_pid());
 488       } else {
 489         if (issuer->get_host())
 490           label =
 491               xbt::string_printf("[(%ld)%s] TestAny TRUE [%d of %lu]", issuer->get_pid(),
 492                                  MC_smx_actor_get_host_name(issuer), value + 1, simcall_comm_testany__get__count(req));
 493         else
 494           label = xbt::string_printf("[(%ld)] TestAny TRUE [%d of %lu]", issuer->get_pid(), value + 1,
 495                                      simcall_comm_testany__get__count(req));
 496       }
 497       break;
 498
 499     case SIMCALL_MUTEX_TRYLOCK:
 500       label = xbt::string_printf("[(%ld)] Mutex TRYLOCK", issuer->get_pid());
 501       break;
 502
 503     case SIMCALL_MUTEX_LOCK:
 504       label = xbt::string_printf("[(%ld)] Mutex LOCK", issuer->get_pid());
 505       break;
 506
 507     case SIMCALL_MC_RANDOM:
 508       if (issuer->get_host())
 509         label = xbt::string_printf("[(%ld)%s] MC_RANDOM (%d)", issuer->get_pid(), MC_smx_actor_get_host_name(issuer),
 510                                    value);
 511       else
 512         label = xbt::string_printf("[(%ld)] MC_RANDOM (%d)", issuer->get_pid(), value);
 513       break;
 514
 515     default:
 516       THROW_UNIMPLEMENTED;
 517   }
 518
 519   return xbt::string_printf("label = \"%s\", color = %s, fontcolor = %s", label.c_str(), color, color);
 520 }
 521
 522 } // namespace mc
 523 } // namespace simgrid