src/mc/mc_request.cpp

   1 /* Copyright (c) 2008-2015. The SimGrid Team.
   2  * All rights reserved.                                                     */
   3
   4 /* This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the license (GNU LGPL) which comes with this package. */
   6
   7 #include <cassert>
   8
   9 #include <xbt/log.h>
  10 #include <xbt/str.h>
  11 #include <xbt/sysdep.h>
  12 #include <xbt/dynar.h>
  13 #include <xbt/swag.h>
  14
  15 #include "src/mc/mc_request.h"
  16 #include "src/mc/mc_safety.h"
  17 #include "src/mc/mc_private.h"
  18 #include "src/mc/mc_smx.h"
  19 #include "src/mc/mc_xbt.hpp"
  20
  21 using simgrid::mc::remote;
  22
  23 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_request, mc,
  24                                 "Logging specific to MC (request)");
  25
  26 static char *pointer_to_string(void *pointer);
  27 static char *buff_size_to_string(size_t size);
  28
  29 static inline
  30 smx_synchro_t MC_get_comm(smx_simcall_t r)
  31 {
  32   switch (r->call ) {
  33   case SIMCALL_COMM_WAIT:
  34     return simcall_comm_wait__get__comm(r);
  35   case SIMCALL_COMM_TEST:
  36     return simcall_comm_test__get__comm(r);
  37   default:
  38     return nullptr;
  39   }
  40 }
  41
  42 static inline
  43 smx_mailbox_t MC_get_rdv(smx_simcall_t r)
  44 {
  45   switch(r->call) {
  46   case SIMCALL_COMM_ISEND:
  47     return simcall_comm_isend__get__rdv(r);
  48   case SIMCALL_COMM_IRECV:
  49     return simcall_comm_irecv__get__rdv(r);
  50   default:
  51     return nullptr;
  52   }
  53 }
  54
  55 namespace simgrid {
  56 namespace mc {
  57
  58 // Does half the job
  59 static inline
  60 bool request_depend_asymmetric(smx_simcall_t r1, smx_simcall_t r2)
  61 {
  62   if (r1->call == SIMCALL_COMM_ISEND && r2->call == SIMCALL_COMM_IRECV)
  63     return false;
  64
  65   if (r1->call == SIMCALL_COMM_IRECV && r2->call == SIMCALL_COMM_ISEND)
  66     return false;
  67
  68   // Those are internal requests, we do not need indirection
  69   // because those objects are copies:
  70   smx_synchro_t synchro1 = MC_get_comm(r1);
  71   smx_synchro_t synchro2 = MC_get_comm(r2);
  72
  73   if ((r1->call == SIMCALL_COMM_ISEND || r1->call == SIMCALL_COMM_IRECV)
  74       && r2->call == SIMCALL_COMM_WAIT) {
  75
  76     smx_mailbox_t rdv = MC_get_rdv(r1);
  77
  78     if (rdv != synchro2->comm.rdv_cpy
  79         && simcall_comm_wait__get__timeout(r2) <= 0)
  80       return false;
  81
  82     if ((r1->issuer != synchro2->comm.src_proc)
  83         && (r1->issuer != synchro2->comm.dst_proc)
  84         && simcall_comm_wait__get__timeout(r2) <= 0)
  85       return false;
  86
  87     if ((r1->call == SIMCALL_COMM_ISEND)
  88         && (synchro2->comm.type == SIMIX_COMM_SEND)
  89         && (synchro2->comm.src_buff !=
  90             simcall_comm_isend__get__src_buff(r1))
  91         && simcall_comm_wait__get__timeout(r2) <= 0)
  92       return false;
  93
  94     if ((r1->call == SIMCALL_COMM_IRECV)
  95         && (synchro2->comm.type == SIMIX_COMM_RECEIVE)
  96         && (synchro2->comm.dst_buff != simcall_comm_irecv__get__dst_buff(r1))
  97         && simcall_comm_wait__get__timeout(r2) <= 0)
  98       return false;
  99   }
 100
 101   /* FIXME: the following rule assumes that the result of the
 102    * isend/irecv call is not stored in a buffer used in the
 103    * test call. */
 104 #if 0
 105   if((r1->call == SIMCALL_COMM_ISEND || r1->call == SIMCALL_COMM_IRECV)
 106      &&  r2->call == SIMCALL_COMM_TEST)
 107      return FALSE;
 108 #endif
 109
 110   if (r1->call == SIMCALL_COMM_WAIT
 111       && (r2->call == SIMCALL_COMM_WAIT || r2->call == SIMCALL_COMM_TEST)
 112       && (synchro1->comm.src_proc == nullptr || synchro1->comm.dst_proc == nullptr))
 113     return false;
 114
 115   if (r1->call == SIMCALL_COMM_TEST &&
 116       (simcall_comm_test__get__comm(r1) == nullptr
 117        || synchro1->comm.src_buff == nullptr
 118        || synchro1->comm.dst_buff == nullptr))
 119     return false;
 120
 121   if (r1->call == SIMCALL_COMM_TEST && r2->call == SIMCALL_COMM_WAIT
 122       && synchro1->comm.src_buff == synchro2->comm.src_buff
 123       && synchro1->comm.dst_buff == synchro2->comm.dst_buff)
 124     return false;
 125
 126   if (r1->call == SIMCALL_COMM_WAIT && r2->call == SIMCALL_COMM_TEST
 127       && synchro1->comm.src_buff != nullptr
 128       && synchro1->comm.dst_buff != nullptr
 129       && synchro2->comm.src_buff != nullptr
 130       && synchro2->comm.dst_buff != nullptr
 131       && synchro1->comm.dst_buff != synchro2->comm.src_buff
 132       && synchro1->comm.dst_buff != synchro2->comm.dst_buff
 133       && synchro2->comm.dst_buff != synchro1->comm.src_buff)
 134     return false;
 135
 136   return true;
 137 }
 138
 139 // Those are internal_req
 140 bool request_depend(smx_simcall_t r1, smx_simcall_t r2)
 141 {
 142   if (r1->issuer == r2->issuer)
 143     return false;
 144
 145   /* Wait with timeout transitions are not considered by the independance theorem, thus we consider them as dependant with all other transitions */
 146   if ((r1->call == SIMCALL_COMM_WAIT && simcall_comm_wait__get__timeout(r1) > 0)
 147       || (r2->call == SIMCALL_COMM_WAIT
 148           && simcall_comm_wait__get__timeout(r2) > 0))
 149     return TRUE;
 150
 151   if (r1->call != r2->call)
 152     return request_depend_asymmetric(r1, r2)
 153       && request_depend_asymmetric(r2, r1);
 154
 155   // Those are internal requests, we do not need indirection
 156   // because those objects are copies:
 157   smx_synchro_t synchro1 = MC_get_comm(r1);
 158   smx_synchro_t synchro2 = MC_get_comm(r2);
 159
 160   switch(r1->call) {
 161   case SIMCALL_COMM_ISEND:
 162     return simcall_comm_isend__get__rdv(r1) == simcall_comm_isend__get__rdv(r2);
 163   case SIMCALL_COMM_IRECV:
 164     return simcall_comm_irecv__get__rdv(r1) == simcall_comm_irecv__get__rdv(r2);
 165   case SIMCALL_COMM_WAIT:
 166     if (synchro1->comm.src_buff == synchro2->comm.src_buff
 167         && synchro1->comm.dst_buff == synchro2->comm.dst_buff)
 168       return false;
 169     else if (synchro1->comm.src_buff != nullptr
 170         && synchro1->comm.dst_buff != nullptr
 171         && synchro2->comm.src_buff != nullptr
 172         && synchro2->comm.dst_buff != nullptr
 173         && synchro1->comm.dst_buff != synchro2->comm.src_buff
 174         && synchro1->comm.dst_buff != synchro2->comm.dst_buff
 175         && synchro2->comm.dst_buff != synchro1->comm.src_buff)
 176       return false;
 177     else
 178       return true;
 179   default:
 180     return true;
 181   }
 182 }
 183
 184 }
 185 }
 186
 187 static char *pointer_to_string(void *pointer)
 188 {
 189
 190   if (XBT_LOG_ISENABLED(mc_request, xbt_log_priority_verbose))
 191     return bprintf("%p", pointer);
 192
 193   return xbt_strdup("(verbose only)");
 194 }
 195
 196 static char *buff_size_to_string(size_t buff_size)
 197 {
 198
 199   if (XBT_LOG_ISENABLED(mc_request, xbt_log_priority_verbose))
 200     return bprintf("%zu", buff_size);
 201
 202   return xbt_strdup("(verbose only)");
 203 }
 204
 205
 206 std::string simgrid::mc::request_to_string(smx_simcall_t req, int value, simgrid::mc::RequestType request_type)
 207 {
 208   xbt_assert(mc_mode == MC_MODE_SERVER);
 209
 210   bool use_remote_comm = true;
 211   switch(request_type) {
 212   case simgrid::mc::RequestType::simix:
 213     use_remote_comm = true;
 214     break;
 215   case simgrid::mc::RequestType::executed:
 216   case simgrid::mc::RequestType::internal:
 217     use_remote_comm = false;
 218     break;
 219   }
 220
 221   const char* type = nullptr;
 222   char *args = nullptr;
 223
 224   smx_process_t issuer = MC_smx_simcall_get_issuer(req);
 225
 226   switch (req->call) {
 227
 228   case SIMCALL_COMM_ISEND: {
 229     type = "iSend";
 230     char* p = pointer_to_string(simcall_comm_isend__get__src_buff(req));
 231     char* bs = buff_size_to_string(simcall_comm_isend__get__src_buff_size(req));
 232     if (issuer->host)
 233       args =
 234           bprintf("src=(%lu)%s (%s), buff=%s, size=%s", issuer->pid,
 235                   MC_smx_process_get_host_name(issuer),
 236                   MC_smx_process_get_name(issuer),
 237                   p, bs);
 238     else
 239       args =
 240           bprintf("src=(%lu)%s, buff=%s, size=%s", issuer->pid,
 241                   MC_smx_process_get_name(issuer), p, bs);
 242     xbt_free(bs);
 243     xbt_free(p);
 244     break;
 245   }
 246
 247   case SIMCALL_COMM_IRECV: {
 248     size_t* remote_size = simcall_comm_irecv__get__dst_buff_size(req);
 249
 250     // size_t size = size_pointer ? *size_pointer : 0;
 251     size_t size = 0;
 252     if (remote_size)
 253       mc_model_checker->process().read_bytes(&size, sizeof(size),
 254         remote(remote_size));
 255
 256     type = "iRecv";
 257     char* p = pointer_to_string(simcall_comm_irecv__get__dst_buff(req));
 258     char* bs = buff_size_to_string(size);
 259     if (issuer->host)
 260       args =
 261           bprintf("dst=(%lu)%s (%s), buff=%s, size=%s", issuer->pid,
 262                   MC_smx_process_get_host_name(issuer),
 263                   MC_smx_process_get_name(issuer),
 264                   p, bs);
 265     else
 266       args =
 267           bprintf("dst=(%lu)%s, buff=%s, size=%s", issuer->pid,
 268                   MC_smx_process_get_name(issuer),
 269                   p, bs);
 270     xbt_free(bs);
 271     xbt_free(p);
 272     break;
 273   }
 274
 275   case SIMCALL_COMM_WAIT: {
 276     smx_synchro_t remote_act = simcall_comm_wait__get__comm(req);
 277     char* p;
 278     if (value == -1) {
 279       type = "WaitTimeout";
 280       p = pointer_to_string(remote_act);
 281       args = bprintf("comm=%s", p);
 282     } else {
 283       type = "Wait";
 284       p = pointer_to_string(remote_act);
 285
 286       s_smx_synchro_t synchro;
 287       smx_synchro_t act;
 288       if (use_remote_comm) {
 289         mc_model_checker->process().read_bytes(&synchro,
 290           sizeof(synchro), remote(remote_act));
 291         act = &synchro;
 292       } else
 293         act = remote_act;
 294
 295       smx_process_t src_proc = mc_model_checker->process().resolveProcess(
 296         simgrid::mc::remote(act->comm.src_proc));
 297       smx_process_t dst_proc = mc_model_checker->process().resolveProcess(
 298         simgrid::mc::remote(act->comm.dst_proc));
 299       args = bprintf("comm=%s [(%lu)%s (%s)-> (%lu)%s (%s)]", p,
 300                      src_proc ? src_proc->pid : 0,
 301                      src_proc ? MC_smx_process_get_host_name(src_proc) : "",
 302                      src_proc ? MC_smx_process_get_name(src_proc) : "",
 303                      dst_proc ? dst_proc->pid : 0,
 304                      dst_proc ? MC_smx_process_get_host_name(dst_proc) : "",
 305                      dst_proc ? MC_smx_process_get_name(dst_proc) : "");
 306     }
 307     xbt_free(p);
 308     break;
 309   }
 310
 311   case SIMCALL_COMM_TEST: {
 312     smx_synchro_t remote_act = simcall_comm_test__get__comm(req);
 313     s_smx_synchro_t synchro;
 314       smx_synchro_t act;
 315       if (use_remote_comm) {
 316         mc_model_checker->process().read_bytes(&synchro,
 317           sizeof(synchro), remote(remote_act));
 318         act = &synchro;
 319       } else
 320         act = remote_act;
 321
 322     char* p;
 323     if (act->comm.src_proc == nullptr || act->comm.dst_proc == nullptr) {
 324       type = "Test FALSE";
 325       p = pointer_to_string(remote_act);
 326       args = bprintf("comm=%s", p);
 327     } else {
 328       type = "Test TRUE";
 329       p = pointer_to_string(remote_act);
 330
 331       smx_process_t src_proc = mc_model_checker->process().resolveProcess(
 332         simgrid::mc::remote(act->comm.src_proc));
 333       smx_process_t dst_proc = mc_model_checker->process().resolveProcess(
 334         simgrid::mc::remote(act->comm.dst_proc));
 335       args = bprintf("comm=%s [(%lu)%s (%s) -> (%lu)%s (%s)]", p,
 336                      src_proc->pid,
 337                      MC_smx_process_get_name(src_proc),
 338                      MC_smx_process_get_host_name(src_proc),
 339                      dst_proc->pid,
 340                      MC_smx_process_get_name(dst_proc),
 341                      MC_smx_process_get_host_name(dst_proc));
 342     }
 343     xbt_free(p);
 344     break;
 345   }
 346
 347   case SIMCALL_COMM_WAITANY: {
 348     type = "WaitAny";
 349     s_xbt_dynar_t comms;
 350     mc_model_checker->process().read_bytes(
 351       &comms, sizeof(comms), remote(simcall_comm_waitany__get__comms(req)));
 352     if (!xbt_dynar_is_empty(&comms)) {
 353       smx_synchro_t remote_sync;
 354       read_element(mc_model_checker->process(),
 355         &remote_sync, remote(simcall_comm_waitany__get__comms(req)), value,
 356         sizeof(remote_sync));
 357       char* p = pointer_to_string(remote_sync);
 358       args = bprintf("comm=%s (%d of %lu)",
 359         p, value + 1, xbt_dynar_length(&comms));
 360       xbt_free(p);
 361     } else
 362       args = bprintf("comm at idx %d", value);
 363     break;
 364   }
 365
 366   case SIMCALL_COMM_TESTANY:
 367     if (value == -1) {
 368       type = "TestAny FALSE";
 369       args = xbt_strdup("-");
 370     } else {
 371       type = "TestAny";
 372       args =
 373           bprintf("(%d of %zu)", value + 1,
 374                   read_length(mc_model_checker->process(),
 375                     simcall_comm_testany__get__comms(req)));
 376     }
 377     break;
 378
 379   case SIMCALL_MUTEX_TRYLOCK:
 380   case SIMCALL_MUTEX_LOCK: {
 381     if (req->call == SIMCALL_MUTEX_LOCK)
 382       type = "Mutex LOCK";
 383     else
 384       type = "Mutex TRYLOCK";
 385
 386     s_smx_mutex_t mutex;
 387     mc_model_checker->process().read_bytes(&mutex, sizeof(mutex),
 388       remote(
 389         req->call == SIMCALL_MUTEX_LOCK
 390         ? simcall_mutex_lock__get__mutex(req)
 391         : simcall_mutex_trylock__get__mutex(req)
 392       ));
 393     s_xbt_swag_t mutex_sleeping;
 394     mc_model_checker->process().read_bytes(&mutex_sleeping, sizeof(mutex_sleeping),
 395       remote(mutex.sleeping));
 396
 397     args = bprintf("locked = %d, owner = %d, sleeping = %d",
 398       mutex.locked,
 399       mutex.owner != nullptr ? (int) mc_model_checker->process().resolveProcess(
 400         simgrid::mc::remote(mutex.owner))->pid : -1,
 401       mutex_sleeping.count);
 402     break;
 403   }
 404
 405   case SIMCALL_MC_RANDOM:
 406     type = "MC_RANDOM";
 407     args = bprintf("%d", value);
 408     break;
 409
 410   default:
 411     THROW_UNIMPLEMENTED;
 412   }
 413
 414   std::string str;
 415   if (args != nullptr)
 416     str = simgrid::xbt::string_printf("[(%lu)%s (%s)] %s(%s)", issuer->pid,
 417                 MC_smx_process_get_host_name(issuer),
 418                 MC_smx_process_get_name(issuer),
 419                 type, args);
 420   else
 421     str = simgrid::xbt::string_printf("[(%lu)%s (%s)] %s ", issuer->pid,
 422                 MC_smx_process_get_host_name(issuer),
 423                 MC_smx_process_get_name(issuer),
 424                 type);
 425   xbt_free(args);
 426   return str;
 427 }
 428
 429 namespace simgrid {
 430 namespace mc {
 431
 432 bool request_is_enabled_by_idx(smx_simcall_t req, unsigned int idx)
 433 {
 434   smx_synchro_t remote_act = nullptr;
 435   switch (req->call) {
 436
 437   case SIMCALL_COMM_WAIT:
 438     /* FIXME: check also that src and dst processes are not suspended */
 439     remote_act = simcall_comm_wait__get__comm(req);
 440     break;
 441
 442   case SIMCALL_COMM_WAITANY: {
 443     read_element(
 444       mc_model_checker->process(), &remote_act,
 445       remote(simcall_comm_waitany__get__comms(req)),
 446       idx, sizeof(remote_act));
 447     }
 448     break;
 449
 450   case SIMCALL_COMM_TESTANY: {
 451     read_element(
 452       mc_model_checker->process(), &remote_act,
 453       remote(simcall_comm_testany__get__comms(req)),
 454       idx, sizeof(remote_act));
 455     }
 456     break;
 457
 458   default:
 459     return true;
 460   }
 461
 462   s_smx_synchro_t synchro;
 463   mc_model_checker->process().read_bytes(
 464     &synchro, sizeof(synchro), remote(remote_act));
 465   return synchro.comm.src_proc && synchro.comm.dst_proc;
 466 }
 467
 468 bool process_is_enabled(smx_process_t process)
 469 {
 470   return simgrid::mc::request_is_enabled(&process->simcall);
 471 }
 472
 473 static const char* colors[] = {
 474   "blue",
 475   "red",
 476   "green3",
 477   "goldenrod",
 478   "brown",
 479   "purple",
 480   "magenta",
 481   "turquoise4",
 482   "gray25",
 483   "forestgreen",
 484   "hotpink",
 485   "lightblue",
 486   "tan",
 487 };
 488
 489 static inline const char* get_color(int id)
 490 {
 491   return colors[id % (sizeof(colors) / sizeof(colors[0])) ];
 492 }
 493
 494 std::string request_get_dot_output(smx_simcall_t req, int value)
 495 {
 496   std::string label;
 497
 498   const smx_process_t issuer = MC_smx_simcall_get_issuer(req);
 499
 500   switch (req->call) {
 501   case SIMCALL_COMM_ISEND:
 502     if (issuer->host)
 503       label = simgrid::xbt::string_printf("[(%lu)%s] iSend", issuer->pid,
 504                   MC_smx_process_get_host_name(issuer));
 505     else
 506       label = bprintf("[(%lu)] iSend", issuer->pid);
 507     break;
 508
 509   case SIMCALL_COMM_IRECV:
 510     if (issuer->host)
 511       label = simgrid::xbt::string_printf("[(%lu)%s] iRecv", issuer->pid,
 512                   MC_smx_process_get_host_name(issuer));
 513     else
 514       label = simgrid::xbt::string_printf("[(%lu)] iRecv", issuer->pid);
 515     break;
 516
 517   case SIMCALL_COMM_WAIT: {
 518     if (value == -1) {
 519       if (issuer->host)
 520         label = simgrid::xbt::string_printf("[(%lu)%s] WaitTimeout", issuer->pid,
 521                     MC_smx_process_get_host_name(issuer));
 522       else
 523         label = simgrid::xbt::string_printf("[(%lu)] WaitTimeout", issuer->pid);
 524     } else {
 525       smx_synchro_t remote_act = simcall_comm_wait__get__comm(req);
 526       s_smx_synchro_t synchro;
 527       mc_model_checker->process().read_bytes(&synchro,
 528         sizeof(synchro), remote(remote_act));
 529
 530       smx_process_t src_proc = mc_model_checker->process().resolveProcess(
 531         simgrid::mc::remote(synchro.comm.src_proc));
 532       smx_process_t dst_proc = mc_model_checker->process().resolveProcess(
 533         simgrid::mc::remote(synchro.comm.dst_proc));
 534       if (issuer->host)
 535         label = simgrid::xbt::string_printf("[(%lu)%s] Wait [(%lu)->(%lu)]",
 536                     issuer->pid,
 537                     MC_smx_process_get_host_name(issuer),
 538                     src_proc ? src_proc->pid : 0,
 539                     dst_proc ? dst_proc->pid : 0);
 540       else
 541         label = simgrid::xbt::string_printf("[(%lu)] Wait [(%lu)->(%lu)]",
 542                     issuer->pid,
 543                     src_proc ? src_proc->pid : 0,
 544                     dst_proc ? dst_proc->pid : 0);
 545     }
 546     break;
 547   }
 548
 549   case SIMCALL_COMM_TEST: {
 550     smx_synchro_t remote_act = simcall_comm_test__get__comm(req);
 551     s_smx_synchro_t synchro;
 552     mc_model_checker->process().read_bytes(&synchro,
 553       sizeof(synchro), remote(remote_act));
 554     if (synchro.comm.src_proc == nullptr || synchro.comm.dst_proc == nullptr) {
 555       if (issuer->host)
 556         label = simgrid::xbt::string_printf("[(%lu)%s] Test FALSE",
 557                     issuer->pid,
 558                     MC_smx_process_get_host_name(issuer));
 559       else
 560         label = bprintf("[(%lu)] Test FALSE", issuer->pid);
 561     } else {
 562       if (issuer->host)
 563         label = simgrid::xbt::string_printf("[(%lu)%s] Test TRUE", issuer->pid,
 564                     MC_smx_process_get_host_name(issuer));
 565       else
 566         label = simgrid::xbt::string_printf("[(%lu)] Test TRUE", issuer->pid);
 567     }
 568     break;
 569   }
 570
 571   case SIMCALL_COMM_WAITANY: {
 572     unsigned long comms_size = read_length(
 573       mc_model_checker->process(), remote(simcall_comm_waitany__get__comms(req)));
 574     if (issuer->host)
 575       label = simgrid::xbt::string_printf("[(%lu)%s] WaitAny [%d of %lu]",
 576                   issuer->pid,
 577                   MC_smx_process_get_host_name(issuer), value + 1,
 578                   comms_size);
 579     else
 580       label = simgrid::xbt::string_printf("[(%lu)] WaitAny [%d of %lu]",
 581                   issuer->pid, value + 1, comms_size);
 582     break;
 583   }
 584
 585   case SIMCALL_COMM_TESTANY:
 586     if (value == -1) {
 587       if (issuer->host)
 588         label = simgrid::xbt::string_printf("[(%lu)%s] TestAny FALSE",
 589                     issuer->pid, MC_smx_process_get_host_name(issuer));
 590       else
 591         label = simgrid::xbt::string_printf("[(%lu)] TestAny FALSE", issuer->pid);
 592     } else {
 593       if (issuer->host)
 594         label = simgrid::xbt::string_printf("[(%lu)%s] TestAny TRUE [%d of %lu]",
 595                     issuer->pid,
 596                     MC_smx_process_get_host_name(issuer), value + 1,
 597                     xbt_dynar_length(simcall_comm_testany__get__comms(req)));
 598       else
 599         label = simgrid::xbt::string_printf("[(%lu)] TestAny TRUE [%d of %lu]",
 600                     issuer->pid,
 601                     value + 1,
 602                     xbt_dynar_length(simcall_comm_testany__get__comms(req)));
 603     }
 604     break;
 605
 606   case SIMCALL_MUTEX_TRYLOCK:
 607     label = simgrid::xbt::string_printf("[(%lu)] Mutex TRYLOCK", issuer->pid);
 608     break;
 609
 610   case SIMCALL_MUTEX_LOCK:
 611     label = simgrid::xbt::string_printf("[(%lu)] Mutex LOCK", issuer->pid);
 612     break;
 613
 614   case SIMCALL_MC_RANDOM:
 615     if (issuer->host)
 616       label = simgrid::xbt::string_printf("[(%lu)%s] MC_RANDOM (%d)",
 617                   issuer->pid, MC_smx_process_get_host_name(issuer), value);
 618     else
 619       label = simgrid::xbt::string_printf("[(%lu)] MC_RANDOM (%d)", issuer->pid, value);
 620     break;
 621
 622   default:
 623     THROW_UNIMPLEMENTED;
 624   }
 625
 626   const char* color = get_color(issuer->pid - 1);
 627   return  simgrid::xbt::string_printf(
 628         "label = \"%s\", color = %s, fontcolor = %s", label.c_str(),
 629         color, color);
 630 }
 631
 632 }
 633 }