src/emerge.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
   4 Copyright (C) 2010-2013 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU Lesser General Public License as published by
   8 the Free Software Foundation; either version 2.1 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU Lesser General Public License for more details.
  15
  16 You should have received a copy of the GNU Lesser General Public License along
  17 with this program; if not, write to the Free Software Foundation, Inc.,
  18 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19 */
  20
  21
  22 #include "emerge.h"
  23
  24 #include <iostream>
  25 #include <queue>
  26
  27 #include "util/container.h"
  28 #include "util/thread.h"
  29 #include "threading/event.h"
  30
  31 #include "config.h"
  32 #include "constants.h"
  33 #include "environment.h"
  34 #include "log.h"
  35 #include "map.h"
  36 #include "mapblock.h"
  37 #include "mapgen_flat.h"
  38 #include "mapgen_fractal.h"
  39 #include "mapgen_v5.h"
  40 #include "mapgen_v6.h"
  41 #include "mapgen_v7.h"
  42 #include "mapgen_valleys.h"
  43 #include "mapgen_singlenode.h"
  44 #include "mg_biome.h"
  45 #include "mg_ore.h"
  46 #include "mg_decoration.h"
  47 #include "mg_schematic.h"
  48 #include "nodedef.h"
  49 #include "profiler.h"
  50 #include "scripting_game.h"
  51 #include "server.h"
  52 #include "serverobject.h"
  53 #include "settings.h"
  54 #include "voxel.h"
  55
  56
  57 struct MapgenDesc {
  58         const char *name;
  59         MapgenFactory *factory;
  60         bool is_user_visible;
  61 };
  62
  63 class EmergeThread : public Thread {
  64 public:
  65         bool enable_mapgen_debug_info;
  66         int id;
  67
  68         EmergeThread(Server *server, int ethreadid);
  69         ~EmergeThread();
  70
  71         void *run();
  72         void signal();
  73
  74         // Requires queue mutex held
  75         bool pushBlock(v3s16 pos);
  76
  77         void cancelPendingItems();
  78
  79         static void runCompletionCallbacks(
  80                 v3s16 pos, EmergeAction action,
  81                 const EmergeCallbackList &callbacks);
  82
  83 private:
  84         Server *m_server;
  85         ServerMap *m_map;
  86         EmergeManager *m_emerge;
  87         Mapgen *m_mapgen;
  88
  89         Event m_queue_event;
  90         std::queue<v3s16> m_block_queue;
  91
  92         bool popBlockEmerge(v3s16 *pos, BlockEmergeData *bedata);
  93
  94         EmergeAction getBlockOrStartGen(
  95                 v3s16 pos, bool allow_gen, MapBlock **block, BlockMakeData *data);
  96         MapBlock *finishGen(v3s16 pos, BlockMakeData *bmdata,
  97                 std::map<v3s16, MapBlock *> *modified_blocks);
  98
  99         friend class EmergeManager;
 100 };
 101
 102 ////
 103 //// Built-in mapgens
 104 ////
 105
 106 MapgenDesc g_reg_mapgens[] = {
 107         {"v5",         new MapgenFactoryV5,         true},
 108         {"v6",         new MapgenFactoryV6,         true},
 109         {"v7",         new MapgenFactoryV7,         true},
 110         {"flat",       new MapgenFactoryFlat,       true},
 111         {"fractal",    new MapgenFactoryFractal,    true},
 112         {"valleys",    new MapgenFactoryValleys,    true},
 113         {"singlenode", new MapgenFactorySinglenode, false},
 114 };
 115
 116 ////
 117 //// EmergeManager
 118 ////
 119
 120 EmergeManager::EmergeManager(IGameDef *gamedef)
 121 {
 122         this->ndef      = gamedef->getNodeDefManager();
 123         this->biomemgr  = new BiomeManager(gamedef);
 124         this->oremgr    = new OreManager(gamedef);
 125         this->decomgr   = new DecorationManager(gamedef);
 126         this->schemmgr  = new SchematicManager(gamedef);
 127         this->gen_notify_on = 0;
 128
 129         // Note that accesses to this variable are not synchronized.
 130         // This is because the *only* thread ever starting or stopping
 131         // EmergeThreads should be the ServerThread.
 132         this->m_threads_active = false;
 133
 134         enable_mapgen_debug_info = g_settings->getBool("enable_mapgen_debug_info");
 135
 136         // If unspecified, leave a proc for the main thread and one for
 137         // some other misc thread
 138         s16 nthreads = 0;
 139         if (!g_settings->getS16NoEx("num_emerge_threads", nthreads))
 140                 nthreads = Thread::getNumberOfProcessors() - 2;
 141         if (nthreads < 1)
 142                 nthreads = 1;
 143
 144         m_qlimit_total = g_settings->getU16("emergequeue_limit_total");
 145         if (!g_settings->getU16NoEx("emergequeue_limit_diskonly", m_qlimit_diskonly))
 146                 m_qlimit_diskonly = nthreads * 5 + 1;
 147         if (!g_settings->getU16NoEx("emergequeue_limit_generate", m_qlimit_generate))
 148                 m_qlimit_generate = nthreads + 1;
 149
 150         // don't trust user input for something very important like this
 151         if (m_qlimit_total < 1)
 152                 m_qlimit_total = 1;
 153         if (m_qlimit_diskonly < 1)
 154                 m_qlimit_diskonly = 1;
 155         if (m_qlimit_generate < 1)
 156                 m_qlimit_generate = 1;
 157
 158         for (s16 i = 0; i < nthreads; i++)
 159                 m_threads.push_back(new EmergeThread((Server *)gamedef, i));
 160
 161         infostream << "EmergeManager: using " << nthreads << " threads" << std::endl;
 162 }
 163
 164
 165 EmergeManager::~EmergeManager()
 166 {
 167         for (u32 i = 0; i != m_threads.size(); i++) {
 168                 EmergeThread *thread = m_threads[i];
 169
 170                 if (m_threads_active) {
 171                         thread->stop();
 172                         thread->signal();
 173                         thread->wait();
 174                 }
 175
 176                 delete thread;
 177                 delete m_mapgens[i];
 178         }
 179
 180         delete biomemgr;
 181         delete oremgr;
 182         delete decomgr;
 183         delete schemmgr;
 184 }
 185
 186
 187 void EmergeManager::loadMapgenParams()
 188 {
 189         params.load(*g_settings);
 190 }
 191
 192
 193 void EmergeManager::initMapgens()
 194 {
 195         if (m_mapgens.size())
 196                 return;
 197
 198         MapgenFactory *mgfactory = getMapgenFactory(params.mg_name);
 199         if (!mgfactory) {
 200                 errorstream << "EmergeManager: mapgen " << params.mg_name <<
 201                         " not registered; falling back to " << DEFAULT_MAPGEN << std::endl;
 202
 203                 params.mg_name = DEFAULT_MAPGEN;
 204
 205                 mgfactory = getMapgenFactory(params.mg_name);
 206                 FATAL_ERROR_IF(mgfactory == NULL, "Couldn't use any mapgen!");
 207         }
 208
 209         if (!params.sparams) {
 210                 params.sparams = mgfactory->createMapgenParams();
 211                 params.sparams->readParams(g_settings);
 212         }
 213
 214         for (u32 i = 0; i != m_threads.size(); i++) {
 215                 Mapgen *mg = mgfactory->createMapgen(i, &params, this);
 216                 m_mapgens.push_back(mg);
 217         }
 218 }
 219
 220
 221 Mapgen *EmergeManager::getCurrentMapgen()
 222 {
 223         for (u32 i = 0; i != m_threads.size(); i++) {
 224                 if (m_threads[i]->isCurrentThread())
 225                         return m_threads[i]->m_mapgen;
 226         }
 227
 228         return NULL;
 229 }
 230
 231
 232 void EmergeManager::startThreads()
 233 {
 234         if (m_threads_active)
 235                 return;
 236
 237         for (u32 i = 0; i != m_threads.size(); i++)
 238                 m_threads[i]->start();
 239
 240         m_threads_active = true;
 241 }
 242
 243
 244 void EmergeManager::stopThreads()
 245 {
 246         if (!m_threads_active)
 247                 return;
 248
 249         // Request thread stop in parallel
 250         for (u32 i = 0; i != m_threads.size(); i++) {
 251                 m_threads[i]->stop();
 252                 m_threads[i]->signal();
 253         }
 254
 255         // Then do the waiting for each
 256         for (u32 i = 0; i != m_threads.size(); i++)
 257                 m_threads[i]->wait();
 258
 259         m_threads_active = false;
 260 }
 261
 262
 263 bool EmergeManager::isRunning()
 264 {
 265         return m_threads_active;
 266 }
 267
 268
 269 bool EmergeManager::enqueueBlockEmerge(
 270         u16 peer_id,
 271         v3s16 blockpos,
 272         bool allow_generate,
 273         bool ignore_queue_limits)
 274 {
 275         u16 flags = 0;
 276         if (allow_generate)
 277                 flags |= BLOCK_EMERGE_ALLOW_GEN;
 278         if (ignore_queue_limits)
 279                 flags |= BLOCK_EMERGE_FORCE_QUEUE;
 280
 281         return enqueueBlockEmergeEx(blockpos, peer_id, flags, NULL, NULL);
 282 }
 283
 284
 285 bool EmergeManager::enqueueBlockEmergeEx(
 286         v3s16 blockpos,
 287         u16 peer_id,
 288         u16 flags,
 289         EmergeCompletionCallback callback,
 290         void *callback_param)
 291 {
 292         EmergeThread *thread = NULL;
 293         bool entry_already_exists = false;
 294
 295         {
 296                 MutexAutoLock queuelock(m_queue_mutex);
 297
 298                 if (!pushBlockEmergeData(blockpos, peer_id, flags,
 299                                 callback, callback_param, &entry_already_exists))
 300                         return false;
 301
 302                 if (entry_already_exists)
 303                         return true;
 304
 305                 thread = getOptimalThread();
 306                 thread->pushBlock(blockpos);
 307         }
 308
 309         thread->signal();
 310
 311         return true;
 312 }
 313
 314
 315 //
 316 // Mapgen-related helper functions
 317 //
 318
 319 v3s16 EmergeManager::getContainingChunk(v3s16 blockpos)
 320 {
 321         return getContainingChunk(blockpos, params.chunksize);
 322 }
 323
 324
 325 v3s16 EmergeManager::getContainingChunk(v3s16 blockpos, s16 chunksize)
 326 {
 327         s16 coff = -chunksize / 2;
 328         v3s16 chunk_offset(coff, coff, coff);
 329
 330         return getContainerPos(blockpos - chunk_offset, chunksize)
 331                 * chunksize + chunk_offset;
 332 }
 333
 334
 335 int EmergeManager::getSpawnLevelAtPoint(v2s16 p)
 336 {
 337         if (m_mapgens.size() == 0 || !m_mapgens[0]) {
 338                 errorstream << "EmergeManager: getSpawnLevelAtPoint() called"
 339                         " before mapgen init" << std::endl;
 340                 return 0;
 341         }
 342
 343         return m_mapgens[0]->getSpawnLevelAtPoint(p);
 344 }
 345
 346
 347 int EmergeManager::getGroundLevelAtPoint(v2s16 p)
 348 {
 349         if (m_mapgens.size() == 0 || !m_mapgens[0]) {
 350                 errorstream << "EmergeManager: getGroundLevelAtPoint() called"
 351                         " before mapgen init" << std::endl;
 352                 return 0;
 353         }
 354
 355         return m_mapgens[0]->getGroundLevelAtPoint(p);
 356 }
 357
 358
 359 bool EmergeManager::isBlockUnderground(v3s16 blockpos)
 360 {
 361 #if 0
 362         v2s16 p = v2s16((blockpos.X * MAP_BLOCKSIZE) + MAP_BLOCKSIZE / 2,
 363                                         (blockpos.Y * MAP_BLOCKSIZE) + MAP_BLOCKSIZE / 2);
 364         int ground_level = getGroundLevelAtPoint(p);
 365         return blockpos.Y * (MAP_BLOCKSIZE + 1) <= min(water_level, ground_level);
 366 #endif
 367
 368         // Use a simple heuristic; the above method is wildly inaccurate anyway.
 369         return blockpos.Y * (MAP_BLOCKSIZE + 1) <= params.water_level;
 370 }
 371
 372
 373 void EmergeManager::getMapgenNames(
 374         std::vector<const char *> *mgnames, bool include_hidden)
 375 {
 376         for (u32 i = 0; i != ARRLEN(g_reg_mapgens); i++) {
 377                 if (include_hidden || g_reg_mapgens[i].is_user_visible)
 378                         mgnames->push_back(g_reg_mapgens[i].name);
 379         }
 380 }
 381
 382
 383 MapgenFactory *EmergeManager::getMapgenFactory(const std::string &mgname)
 384 {
 385         for (u32 i = 0; i != ARRLEN(g_reg_mapgens); i++) {
 386                 if (mgname == g_reg_mapgens[i].name)
 387                         return g_reg_mapgens[i].factory;
 388         }
 389
 390         return NULL;
 391 }
 392
 393
 394 bool EmergeManager::pushBlockEmergeData(
 395         v3s16 pos,
 396         u16 peer_requested,
 397         u16 flags,
 398         EmergeCompletionCallback callback,
 399         void *callback_param,
 400         bool *entry_already_exists)
 401 {
 402         u16 &count_peer = m_peer_queue_count[peer_requested];
 403
 404         if ((flags & BLOCK_EMERGE_FORCE_QUEUE) == 0) {
 405                 if (m_blocks_enqueued.size() >= m_qlimit_total)
 406                         return false;
 407
 408                 if (peer_requested != PEER_ID_INEXISTENT) {
 409                         u16 qlimit_peer = (flags & BLOCK_EMERGE_ALLOW_GEN) ?
 410                                 m_qlimit_generate : m_qlimit_diskonly;
 411                         if (count_peer >= qlimit_peer)
 412                                 return false;
 413                 }
 414         }
 415
 416         std::pair<std::map<v3s16, BlockEmergeData>::iterator, bool> findres;
 417         findres = m_blocks_enqueued.insert(std::make_pair(pos, BlockEmergeData()));
 418
 419         BlockEmergeData &bedata = findres.first->second;
 420         *entry_already_exists   = !findres.second;
 421
 422         if (callback)
 423                 bedata.callbacks.push_back(std::make_pair(callback, callback_param));
 424
 425         if (*entry_already_exists) {
 426                 bedata.flags |= flags;
 427         } else {
 428                 bedata.flags = flags;
 429                 bedata.peer_requested = peer_requested;
 430
 431                 count_peer++;
 432         }
 433
 434         return true;
 435 }
 436
 437
 438 bool EmergeManager::popBlockEmergeData(
 439         v3s16 pos,
 440         BlockEmergeData *bedata)
 441 {
 442         std::map<v3s16, BlockEmergeData>::iterator it;
 443         std::map<u16, u16>::iterator it2;
 444
 445         it = m_blocks_enqueued.find(pos);
 446         if (it == m_blocks_enqueued.end())
 447                 return false;
 448
 449         *bedata = it->second;
 450
 451         it2 = m_peer_queue_count.find(bedata->peer_requested);
 452         if (it2 == m_peer_queue_count.end())
 453                 return false;
 454
 455         u16 &count_peer = it2->second;
 456         assert(count_peer != 0);
 457         count_peer--;
 458
 459         m_blocks_enqueued.erase(it);
 460
 461         return true;
 462 }
 463
 464
 465 EmergeThread *EmergeManager::getOptimalThread()
 466 {
 467         size_t nthreads = m_threads.size();
 468
 469         FATAL_ERROR_IF(nthreads == 0, "No emerge threads!");
 470
 471         size_t index = 0;
 472         size_t nitems_lowest = m_threads[0]->m_block_queue.size();
 473
 474         for (size_t i = 1; i < nthreads; i++) {
 475                 size_t nitems = m_threads[i]->m_block_queue.size();
 476                 if (nitems < nitems_lowest) {
 477                         index = i;
 478                         nitems_lowest = nitems;
 479                 }
 480         }
 481
 482         return m_threads[index];
 483 }
 484
 485
 486 ////
 487 //// EmergeThread
 488 ////
 489
 490 EmergeThread::EmergeThread(Server *server, int ethreadid) :
 491         enable_mapgen_debug_info(false),
 492         id(ethreadid),
 493         m_server(server),
 494         m_map(NULL),
 495         m_emerge(NULL),
 496         m_mapgen(NULL)
 497 {
 498         m_name = "Emerge-" + itos(ethreadid);
 499 }
 500
 501
 502 EmergeThread::~EmergeThread()
 503 {
 504         //cancelPendingItems();
 505 }
 506
 507
 508 void EmergeThread::signal()
 509 {
 510         m_queue_event.signal();
 511 }
 512
 513
 514 bool EmergeThread::pushBlock(v3s16 pos)
 515 {
 516         m_block_queue.push(pos);
 517         return true;
 518 }
 519
 520
 521 void EmergeThread::cancelPendingItems()
 522 {
 523         MutexAutoLock queuelock(m_emerge->m_queue_mutex);
 524
 525         while (!m_block_queue.empty()) {
 526                 BlockEmergeData bedata;
 527                 v3s16 pos;
 528
 529                 pos = m_block_queue.front();
 530                 m_block_queue.pop();
 531
 532                 m_emerge->popBlockEmergeData(pos, &bedata);
 533
 534                 runCompletionCallbacks(pos, EMERGE_CANCELLED, bedata.callbacks);
 535         }
 536 }
 537
 538
 539 void EmergeThread::runCompletionCallbacks(
 540         v3s16 pos,
 541         EmergeAction action,
 542         const EmergeCallbackList &callbacks)
 543 {
 544         for (size_t i = 0; i != callbacks.size(); i++) {
 545                 EmergeCompletionCallback callback;
 546                 void *param;
 547
 548                 callback = callbacks[i].first;
 549                 param    = callbacks[i].second;
 550
 551                 callback(pos, action, param);
 552         }
 553 }
 554
 555
 556 bool EmergeThread::popBlockEmerge(v3s16 *pos, BlockEmergeData *bedata)
 557 {
 558         MutexAutoLock queuelock(m_emerge->m_queue_mutex);
 559
 560         if (m_block_queue.empty())
 561                 return false;
 562
 563         *pos = m_block_queue.front();
 564         m_block_queue.pop();
 565
 566         m_emerge->popBlockEmergeData(*pos, bedata);
 567
 568         return true;
 569 }
 570
 571
 572 EmergeAction EmergeThread::getBlockOrStartGen(
 573         v3s16 pos, bool allow_gen, MapBlock **block, BlockMakeData *bmdata)
 574 {
 575         MutexAutoLock envlock(m_server->m_env_mutex);
 576
 577         // 1). Attempt to fetch block from memory
 578         *block = m_map->getBlockNoCreateNoEx(pos);
 579         if (*block && !(*block)->isDummy() && (*block)->isGenerated())
 580                 return EMERGE_FROM_MEMORY;
 581
 582         // 2). Attempt to load block from disk
 583         *block = m_map->loadBlock(pos);
 584         if (*block && (*block)->isGenerated())
 585                 return EMERGE_FROM_DISK;
 586
 587         // 3). Attempt to start generation
 588         if (allow_gen && m_map->initBlockMake(pos, bmdata))
 589                 return EMERGE_GENERATED;
 590
 591         // All attempts failed; cancel this block emerge
 592         return EMERGE_CANCELLED;
 593 }
 594
 595
 596 MapBlock *EmergeThread::finishGen(v3s16 pos, BlockMakeData *bmdata,
 597         std::map<v3s16, MapBlock *> *modified_blocks)
 598 {
 599         MutexAutoLock envlock(m_server->m_env_mutex);
 600         ScopeProfiler sp(g_profiler,
 601                 "EmergeThread: after Mapgen::makeChunk", SPT_AVG);
 602
 603         /*
 604                 Perform post-processing on blocks (invalidate lighting, queue liquid
 605                 transforms, etc.) to finish block make
 606         */
 607         m_map->finishBlockMake(bmdata, modified_blocks);
 608
 609         MapBlock *block = m_map->getBlockNoCreateNoEx(pos);
 610         if (!block) {
 611                 errorstream << "EmergeThread::finishGen: Couldn't grab block we "
 612                         "just generated: " << PP(pos) << std::endl;
 613                 return NULL;
 614         }
 615
 616         v3s16 minp = bmdata->blockpos_min * MAP_BLOCKSIZE;
 617         v3s16 maxp = bmdata->blockpos_max * MAP_BLOCKSIZE +
 618                                  v3s16(1,1,1) * (MAP_BLOCKSIZE - 1);
 619
 620         // Ignore map edit events, they will not need to be sent
 621         // to anybody because the block hasn't been sent to anybody
 622         MapEditEventAreaIgnorer ign(
 623                 &m_server->m_ignore_map_edit_events_area,
 624                 VoxelArea(minp, maxp));
 625
 626         /*
 627                 Run Lua on_generated callbacks
 628         */
 629         try {
 630                 m_server->getScriptIface()->environment_OnGenerated(
 631                         minp, maxp, m_mapgen->blockseed);
 632         } catch (LuaError &e) {
 633                 m_server->setAsyncFatalError("Lua: " + std::string(e.what()));
 634         }
 635
 636         EMERGE_DBG_OUT("ended up with: " << analyze_block(block));
 637
 638         /*
 639                 Activate the block
 640         */
 641         m_server->m_env->activateBlock(block, 0);
 642
 643         return block;
 644 }
 645
 646
 647 void *EmergeThread::run()
 648 {
 649         DSTACK(FUNCTION_NAME);
 650         BEGIN_DEBUG_EXCEPTION_HANDLER
 651
 652         v3s16 pos;
 653
 654         m_map    = (ServerMap *)&(m_server->m_env->getMap());
 655         m_emerge = m_server->m_emerge;
 656         m_mapgen = m_emerge->m_mapgens[id];
 657         enable_mapgen_debug_info = m_emerge->enable_mapgen_debug_info;
 658
 659         try {
 660         while (!stopRequested()) {
 661                 std::map<v3s16, MapBlock *> modified_blocks;
 662                 BlockEmergeData bedata;
 663                 BlockMakeData bmdata;
 664                 EmergeAction action;
 665                 MapBlock *block;
 666
 667                 if (!popBlockEmerge(&pos, &bedata)) {
 668                         m_queue_event.wait();
 669                         continue;
 670                 }
 671
 672                 if (blockpos_over_limit(pos))
 673                         continue;
 674
 675                 bool allow_gen = bedata.flags & BLOCK_EMERGE_ALLOW_GEN;
 676                 EMERGE_DBG_OUT("pos=" PP(pos) " allow_gen=" << allow_gen);
 677
 678                 action = getBlockOrStartGen(pos, allow_gen, &block, &bmdata);
 679                 if (action == EMERGE_GENERATED) {
 680                         {
 681                                 ScopeProfiler sp(g_profiler,
 682                                         "EmergeThread: Mapgen::makeChunk", SPT_AVG);
 683                                 TimeTaker t("mapgen::make_block()");
 684
 685                                 m_mapgen->makeChunk(&bmdata);
 686
 687                                 if (enable_mapgen_debug_info == false)
 688                                         t.stop(true); // Hide output
 689                         }
 690
 691                         block = finishGen(pos, &bmdata, &modified_blocks);
 692                 }
 693
 694                 runCompletionCallbacks(pos, action, bedata.callbacks);
 695
 696                 if (block)
 697                         modified_blocks[pos] = block;
 698
 699                 if (modified_blocks.size() > 0)
 700                         m_server->SetBlocksNotSent(modified_blocks);
 701         }
 702         } catch (VersionMismatchException &e) {
 703                 std::ostringstream err;
 704                 err << "World data version mismatch in MapBlock " << PP(pos) << std::endl
 705                         << "----" << std::endl
 706                         << "\"" << e.what() << "\"" << std::endl
 707                         << "See debug.txt." << std::endl
 708                         << "World probably saved by a newer version of " PROJECT_NAME_C "."
 709                         << std::endl;
 710                 m_server->setAsyncFatalError(err.str());
 711         } catch (SerializationError &e) {
 712                 std::ostringstream err;
 713                 err << "Invalid data in MapBlock " << PP(pos) << std::endl
 714                         << "----" << std::endl
 715                         << "\"" << e.what() << "\"" << std::endl
 716                         << "See debug.txt." << std::endl
 717                         << "You can ignore this using [ignore_world_load_errors = true]."
 718                         << std::endl;
 719                 m_server->setAsyncFatalError(err.str());
 720         }
 721
 722         END_DEBUG_EXCEPTION_HANDLER
 723         return NULL;
 724 }