src/emerge.cpp

   1 /*
   2 Minetest-c55
   3 Copyright (C) 2010-2011 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20
  21 #include "server.h"
  22 #include <iostream>
  23 #include <queue>
  24 #include "clientserver.h"
  25 #include "map.h"
  26 #include "jmutexautolock.h"
  27 #include "main.h"
  28 #include "constants.h"
  29 #include "voxel.h"
  30 #include "config.h"
  31 #include "mapblock.h"
  32 #include "serverobject.h"
  33 #include "settings.h"
  34 #include "script.h"
  35 #include "scriptapi.h"
  36 #include "profiler.h"
  37 #include "log.h"
  38 #include "nodedef.h"
  39 #include "biome.h"
  40 #include "emerge.h"
  41 #include "mapgen_v6.h"
  42
  43
  44 EmergeManager::EmergeManager(IGameDef *gamedef, BiomeDefManager *bdef) {
  45         //register built-in mapgens
  46         registerMapgen("v6", new MapgenFactoryV6());
  47
  48         this->biomedef = bdef ? bdef : new BiomeDefManager(gamedef);
  49         this->params   = NULL;
  50         this->mapgen   = NULL;
  51
  52         queuemutex.Init();
  53         emergethread = new EmergeThread((Server *)gamedef);
  54 }
  55
  56
  57 EmergeManager::~EmergeManager() {
  58         emergethread->setRun(false);
  59         emergethread->stop();
  60
  61         delete emergethread;
  62         delete biomedef;
  63         delete mapgen;
  64         delete params;
  65 }
  66
  67
  68 void EmergeManager::initMapgens(MapgenParams *mgparams) {
  69         if (mapgen)
  70                 return;
  71
  72         this->params = mgparams;
  73         this->mapgen = getMapgen(); //only one mapgen for now!
  74 }
  75
  76
  77 Mapgen *EmergeManager::getMapgen() {
  78         if (!mapgen) {
  79                 mapgen = createMapgen(params->mg_name, 0, params, this);
  80                 if (!mapgen) {
  81                         infostream << "EmergeManager: falling back to mapgen v6" << std::endl;
  82                         delete params;
  83                         params = createMapgenParams("v6");
  84                         mapgen = createMapgen("v6", 0, params, this);
  85                 }
  86         }
  87         return mapgen;
  88 }
  89
  90
  91 bool EmergeManager::enqueueBlockEmerge(u16 peer_id, v3s16 p, bool allow_generate) { ///return false if adding failed, or queue full!
  92         u8 flags = 0;
  93
  94         if (allow_generate)
  95                 flags |= BLOCK_EMERGE_ALLOWGEN;
  96
  97         //TODO:
  98         // add logic to select which emergethread to add it to
  99         //  - one with the least queue contents?
 100         //  - if a queue is too full, move onto another one
 101         //  - use the peer id sometime
 102
 103         {
 104                 JMutexAutoLock queuelock(queuemutex);
 105
 106                 std::map<v3s16, u8>::const_iterator iter = blocks_enqueued.find(p);
 107                 if (iter != blocks_enqueued.end()) {
 108                         flags |= iter->second;
 109                         blocks_enqueued[p] = flags;
 110                         return true;
 111                 }
 112
 113                 blocks_enqueued.insert(std::make_pair(p, flags));
 114                 emergethread->blockqueue.push(p);
 115         }
 116         emergethread->qevent.signal();
 117
 118         return true;
 119 }
 120
 121
 122 bool EmergeManager::popBlockEmerge(v3s16 *pos, u8 *flags) {
 123         JMutexAutoLock queuelock(queuemutex);
 124
 125         if (emergethread->blockqueue.empty())
 126                 return false;
 127         v3s16 p = emergethread->blockqueue.front();
 128         emergethread->blockqueue.pop();
 129
 130         *pos = p;
 131
 132         std::map<v3s16, u8>::iterator iter = blocks_enqueued.find(p);
 133         if (iter == blocks_enqueued.end()) //uh oh, this isn't right!!!!!!!!!!!!!!!!!!
 134                 return false;
 135
 136         *flags = iter->second;
 137         blocks_enqueued.erase(iter);
 138
 139         return true;
 140 }
 141
 142
 143 int EmergeManager::getGroundLevelAtPoint(v2s16 p) {
 144         if (!mapgen)
 145                 return 0;
 146         return mapgen->getGroundLevelAtPoint(p);
 147 }
 148
 149
 150 bool EmergeManager::isBlockUnderground(v3s16 blockpos) {
 151         /*
 152         v2s16 p = v2s16((blockpos.X * MAP_BLOCKSIZE) + MAP_BLOCKSIZE / 2,
 153                                         (blockpos.Y * MAP_BLOCKSIZE) + MAP_BLOCKSIZE / 2);
 154         int ground_level = getGroundLevelAtPoint(p);
 155         return blockpos.Y * (MAP_BLOCKSIZE + 1) <= min(water_level, ground_level);
 156         */
 157
 158         //yuck, but then again, should i bother being accurate?
 159         //the height of the nodes in a single block is quite variable
 160         return blockpos.Y * (MAP_BLOCKSIZE + 1) <= params->water_level;
 161 }
 162
 163
 164 u32 EmergeManager::getBlockSeed(v3s16 p) {
 165         return (u32)(params->seed & 0xFFFFFFFF) +
 166                 p.Z * 38134234 +
 167                 p.Y * 42123 +
 168                 p.Y * 23;
 169 }
 170
 171
 172 Mapgen *EmergeManager::createMapgen(std::string mgname, int mgid,
 173                                                                         MapgenParams *mgparams, EmergeManager *emerge) {
 174         std::map<std::string, MapgenFactory *>::const_iterator iter = mglist.find(mgname);
 175         if (iter == mglist.end()) {
 176                 errorstream << "EmergeManager; mapgen " << mgname <<
 177                  " not registered" << std::endl;
 178                 return NULL;
 179         }
 180
 181         MapgenFactory *mgfactory = iter->second;
 182         return mgfactory->createMapgen(mgid, mgparams, emerge);
 183 }
 184
 185
 186 MapgenParams *EmergeManager::createMapgenParams(std::string mgname) {
 187         std::map<std::string, MapgenFactory *>::const_iterator iter = mglist.find(mgname);
 188         if (iter == mglist.end()) {
 189                 errorstream << "EmergeManager: mapgen " << mgname <<
 190                  " not registered" << std::endl;
 191                 return NULL;
 192         }
 193
 194         MapgenFactory *mgfactory = iter->second;
 195         return mgfactory->createMapgenParams();
 196 }
 197
 198
 199 MapgenParams *EmergeManager::getParamsFromSettings(Settings *settings) {
 200         std::string mg_name = settings->get("mg_name");
 201         MapgenParams *mgparams = createMapgenParams(mg_name);
 202
 203         mgparams->mg_name     = mg_name;
 204         mgparams->seed        = settings->getU64(settings == g_settings ? "fixed_map_seed" : "seed");
 205         mgparams->water_level = settings->getS16("water_level");
 206         mgparams->chunksize   = settings->getS16("chunksize");
 207         mgparams->flags       = settings->getS32("mg_flags");
 208
 209         if (!mgparams->readParams(settings)) {
 210                 delete mgparams;
 211                 return NULL;
 212         }
 213         return mgparams;
 214 }
 215
 216
 217 void EmergeManager::setParamsToSettings(Settings *settings) {
 218         settings->set("mg_name",         params->mg_name);
 219         settings->setU64("seed",         params->seed);
 220         settings->setS16("water_level",  params->water_level);
 221         settings->setS16("chunksize",    params->chunksize);
 222         settings->setFlagStr("mg_flags", params->flags, flagdesc_mapgen);
 223
 224         params->writeParams(settings);
 225 }
 226
 227
 228 bool EmergeManager::registerMapgen(std::string mgname, MapgenFactory *mgfactory) {
 229         mglist.insert(std::make_pair(mgname, mgfactory));
 230         infostream << "EmergeManager: registered mapgen " << mgname << std::endl;
 231 }
 232
 233
 234
 235 class MapEditEventIgnorer
 236 {
 237 public:
 238         MapEditEventIgnorer(bool *flag):
 239                 m_flag(flag)
 240         {
 241                 if(*m_flag == false)
 242                         *m_flag = true;
 243                 else
 244                         m_flag = NULL;
 245         }
 246
 247         ~MapEditEventIgnorer()
 248         {
 249                 if(m_flag)
 250                 {
 251                         assert(*m_flag);
 252                         *m_flag = false;
 253                 }
 254         }
 255
 256 private:
 257         bool *m_flag;
 258 };
 259
 260 class MapEditEventAreaIgnorer
 261 {
 262 public:
 263         MapEditEventAreaIgnorer(VoxelArea *ignorevariable, const VoxelArea &a):
 264                 m_ignorevariable(ignorevariable)
 265         {
 266                 if(m_ignorevariable->getVolume() == 0)
 267                         *m_ignorevariable = a;
 268                 else
 269                         m_ignorevariable = NULL;
 270         }
 271
 272         ~MapEditEventAreaIgnorer()
 273         {
 274                 if(m_ignorevariable)
 275                 {
 276                         assert(m_ignorevariable->getVolume() != 0);
 277                         *m_ignorevariable = VoxelArea();
 278                 }
 279         }
 280
 281 private:
 282         VoxelArea *m_ignorevariable;
 283 };
 284
 285
 286 #if 1
 287
 288 #define EMERGE_DBG_OUT(x) \
 289         { if (enable_mapgen_debug_info) \
 290         infostream << "EmergeThread: " x << std::endl; }
 291
 292 bool EmergeThread::getBlockOrStartGen(v3s16 p, MapBlock **b,
 293                                                                         BlockMakeData *data, bool allow_gen) {
 294         v2s16 p2d(p.X, p.Z);
 295         //envlock: usually takes <=1ms, sometimes 90ms or ~400ms to acquire
 296         JMutexAutoLock envlock(m_server->m_env_mutex);
 297
 298         // Load sector if it isn't loaded
 299         if (map->getSectorNoGenerateNoEx(p2d) == NULL)
 300                 map->loadSectorMeta(p2d);
 301
 302         // Attempt to load block
 303         MapBlock *block = map->getBlockNoCreateNoEx(p);
 304         if (!block || block->isDummy() || !block->isGenerated()) {
 305                 EMERGE_DBG_OUT("not in memory, attempting to load from disk");
 306                 block = map->loadBlock(p);
 307         }
 308
 309         // If could not load and allowed to generate,
 310         // start generation inside this same envlock
 311         if (allow_gen && (block == NULL || !block->isGenerated())) {
 312                 EMERGE_DBG_OUT("generating");
 313                 map->initBlockMake(data, p);
 314                 return true;
 315         }
 316
 317         *b = block;
 318         return false;
 319 }
 320
 321
 322 void *EmergeThread::Thread() {
 323         ThreadStarted();
 324         log_register_thread("EmergeThread");
 325         DSTACK(__FUNCTION_NAME);
 326         BEGIN_DEBUG_EXCEPTION_HANDLER
 327
 328         v3s16 last_tried_pos(-32768,-32768,-32768); // For error output
 329         v3s16 p;
 330         u8 flags;
 331
 332         map    = (ServerMap *)&(m_server->m_env->getMap());
 333         emerge = m_server->m_emerge;
 334         mapgen = emerge->getMapgen();
 335
 336         while (getRun())
 337         try {
 338                 while (!emerge->popBlockEmerge(&p, &flags))
 339                         qevent.wait();
 340
 341                 last_tried_pos = p;
 342                 if (blockpos_over_limit(p))
 343                         continue;
 344
 345                 bool allow_generate = flags & BLOCK_EMERGE_ALLOWGEN;
 346                 EMERGE_DBG_OUT("p=" PP(p) " allow_generate=" << allow_generate);
 347
 348                 /*
 349                         Try to fetch block from memory or disk.
 350                         If not found and asked to generate, initialize generator.
 351                 */
 352                 BlockMakeData data;
 353                 MapBlock *block = NULL;
 354                 core::map<v3s16, MapBlock *> modified_blocks;
 355
 356                 if (getBlockOrStartGen(p, &block, &data, allow_generate)) {
 357                         {
 358                                 ScopeProfiler sp(g_profiler, "EmergeThread: Mapgen::makeChunk", SPT_AVG);
 359                                 TimeTaker t("mapgen::make_block()");
 360
 361                                 mapgen->makeChunk(&data);
 362
 363                                 if (enable_mapgen_debug_info == false)
 364                                         t.stop(true); // Hide output
 365                         }
 366
 367                         {
 368                                 //envlock: usually 0ms, but can take either 30 or 400ms to acquire
 369                                 JMutexAutoLock envlock(m_server->m_env_mutex);
 370                                 ScopeProfiler sp(g_profiler, "EmergeThread: after "
 371                                                 "mapgen::make_block (envlock)", SPT_AVG);
 372
 373                                 map->finishBlockMake(&data, modified_blocks);
 374
 375                                 block = map->getBlockNoCreateNoEx(p);
 376                                 if (block) {
 377                                         /*
 378                                                 Do some post-generate stuff
 379                                         */
 380                                         v3s16 minp = data.blockpos_min * MAP_BLOCKSIZE;
 381                                         v3s16 maxp = data.blockpos_max * MAP_BLOCKSIZE +
 382                                                                  v3s16(1,1,1) * (MAP_BLOCKSIZE - 1);
 383
 384                                         // Ignore map edit events, they will not need to be sent
 385                                         // to anybody because the block hasn't been sent to anybody
 386                                         MapEditEventAreaIgnorer
 387                                                 ign(&m_server->m_ignore_map_edit_events_area,
 388                                                 VoxelArea(minp, maxp));
 389                                         {  // takes about 90ms with -O1 on an e3-1230v2
 390                                                 scriptapi_environment_on_generated(m_server->m_lua,
 391                                                                 minp, maxp, emerge->getBlockSeed(minp));
 392                                         }
 393
 394                                         EMERGE_DBG_OUT("ended up with: " << analyze_block(block));
 395
 396                                         m_server->m_env->activateBlock(block, 0);
 397                                 }
 398                         }
 399                 }
 400
 401                 /*
 402                         Set sent status of modified blocks on clients
 403                 */
 404
 405                 // NOTE: Server's clients are also behind the connection mutex
 406                 //conlock: consistently takes 30-40ms to acquire
 407                 JMutexAutoLock lock(m_server->m_con_mutex);
 408                 // Add the originally fetched block to the modified list
 409                 if (block)
 410                         modified_blocks.insert(p, block);
 411
 412                 // Set the modified blocks unsent for all the clients
 413                 for (core::map<u16, RemoteClient*>::Iterator
 414                          i = m_server->m_clients.getIterator();
 415                          i.atEnd() == false; i++) {
 416                         RemoteClient *client = i.getNode()->getValue();
 417                         if (modified_blocks.size() > 0) {
 418                                 // Remove block from sent history
 419                                 client->SetBlocksNotSent(modified_blocks);
 420                         }
 421                 }
 422         }
 423         catch (VersionMismatchException &e) {
 424                 std::ostringstream err;
 425                 err << "World data version mismatch in MapBlock "<<PP(last_tried_pos)<<std::endl;
 426                 err << "----"<<std::endl;
 427                 err << "\""<<e.what()<<"\""<<std::endl;
 428                 err << "See debug.txt."<<std::endl;
 429                 err << "World probably saved by a newer version of Minetest."<<std::endl;
 430                 m_server->setAsyncFatalError(err.str());
 431         }
 432         catch (SerializationError &e) {
 433                 std::ostringstream err;
 434                 err << "Invalid data in MapBlock "<<PP(last_tried_pos)<<std::endl;
 435                 err << "----"<<std::endl;
 436                 err << "\""<<e.what()<<"\""<<std::endl;
 437                 err << "See debug.txt."<<std::endl;
 438                 err << "You can ignore this using [ignore_world_load_errors = true]."<<std::endl;
 439                 m_server->setAsyncFatalError(err.str());
 440         }
 441
 442         END_DEBUG_EXCEPTION_HANDLER(errorstream)
 443         log_deregister_thread();
 444         return NULL;
 445 }
 446
 447 #else
 448
 449 void *EmergeThread::Thread() {
 450         ThreadStarted();
 451         log_register_thread("EmergeThread");
 452         DSTACK(__FUNCTION_NAME);
 453         BEGIN_DEBUG_EXCEPTION_HANDLER
 454
 455         bool enable_mapgen_debug_info = g_settings->getBool("enable_mapgen_debug_info");
 456
 457         v3s16 last_tried_pos(-32768,-32768,-32768); // For error output
 458         ServerMap &map = ((ServerMap&)m_server->m_env->getMap());
 459         EmergeManager *emerge = m_server->m_emerge;
 460         Mapgen *mapgen = emerge->getMapgen();
 461
 462         while(getRun())
 463         try {
 464                 QueuedBlockEmerge *qptr = m_server->m_emerge_queue.pop();
 465                 if(qptr == NULL)
 466                         break;
 467                 SharedPtr<QueuedBlockEmerge> q(qptr);
 468
 469                 v3s16 &p = q->pos;
 470                 v2s16 p2d(p.X,p.Z);
 471
 472                 last_tried_pos = p;
 473
 474                 /*
 475                         Do not generate over-limit
 476                 */
 477                 if (blockpos_over_limit(p))
 478                         continue;
 479
 480                 //infostream<<"EmergeThread::Thread(): running"<<std::endl;
 481
 482                 //TimeTaker timer("block emerge");
 483
 484                 /*
 485                         Try to emerge it from somewhere.
 486
 487                         If it is only wanted as optional, only loading from disk
 488                         will be allowed.
 489                 */
 490
 491                 /*
 492                         Check if any peer wants it as non-optional. In that case it
 493                         will be generated.
 494
 495                         Also decrement the emerge queue count in clients.
 496                 */
 497
 498                 bool only_from_disk = true;
 499                 {
 500                         core::map<u16, u8>::Iterator i;
 501                         for (i=q->s.getIterator(); !i.atEnd(); i++) {
 502                                 u8 flags = i.getNode()->getValue();
 503                                 if (!(flags & BLOCK_EMERGE_FLAG_FROMDISK)) {
 504                                         only_from_disk = false;
 505                                         break;
 506                                 }
 507                         }
 508                 }
 509
 510                 if (enable_mapgen_debug_info)
 511                         infostream<<"EmergeThread: p="
 512                                         <<"("<<p.X<<","<<p.Y<<","<<p.Z<<") "
 513                                         <<"only_from_disk="<<only_from_disk<<std::endl;
 514
 515                 MapBlock *block = NULL;
 516                 bool got_block = true;
 517                 core::map<v3s16, MapBlock*> modified_blocks;
 518
 519                 /*
 520                         Try to fetch block from memory or disk.
 521                         If not found and asked to generate, initialize generator.
 522                 */
 523
 524                 bool started_generate = false;
 525                 BlockMakeData data;
 526                 {
 527                         JMutexAutoLock envlock(m_server->m_env_mutex);
 528
 529                         // Load sector if it isn't loaded
 530                         if(map.getSectorNoGenerateNoEx(p2d) == NULL)
 531                                 map.loadSectorMeta(p2d);
 532
 533                         // Attempt to load block
 534                         block = map.getBlockNoCreateNoEx(p);
 535                         if(!block || block->isDummy() || !block->isGenerated()) {
 536                                 if(enable_mapgen_debug_info)
 537                                         infostream<<"EmergeThread: not in memory, "
 538                                                         <<"attempting to load from disk"<<std::endl;
 539
 540                                 block = map.loadBlock(p);
 541                         }
 542
 543                         // If could not load and allowed to generate, start generation
 544                         // inside this same envlock
 545                         if(only_from_disk == false &&
 546                                         (block == NULL || block->isGenerated() == false)){
 547                                 if(enable_mapgen_debug_info)
 548                                         infostream<<"EmergeThread: generating"<<std::endl;
 549                                 started_generate = true;
 550
 551                                 map.initBlockMake(&data, p);
 552                         }
 553                 }
 554
 555                 /*
 556                         If generator was initialized, generate now when envlock is free.
 557                 */
 558                 if(started_generate) {
 559                         {
 560                                 ScopeProfiler sp(g_profiler, "EmergeThread: mapgen::make_block",
 561                                                 SPT_AVG);
 562                                 TimeTaker t("mapgen::make_block()");
 563
 564                                 mapgen->makeChunk(&data);
 565
 566                                 if (enable_mapgen_debug_info == false)
 567                                         t.stop(true); // Hide output
 568                         }
 569
 570                         do{ // enable break
 571                                 // Lock environment again to access the map
 572                                 JMutexAutoLock envlock(m_server->m_env_mutex);
 573
 574                                 ScopeProfiler sp(g_profiler, "EmergeThread: after "
 575                                                 "mapgen::make_block (envlock)", SPT_AVG);
 576
 577                                 // Blit data back on map, update lighting, add mobs and
 578                                 // whatever this does
 579                                 map.finishBlockMake(&data, modified_blocks);
 580
 581                                 // Get central block
 582                                 block = map.getBlockNoCreateNoEx(p);
 583
 584                                 // If block doesn't exist, don't try doing anything with it
 585                                 // This happens if the block is not in generation boundaries
 586                                 if(!block)
 587                                         break;
 588
 589                                 /*
 590                                         Do some post-generate stuff
 591                                 */
 592                                 v3s16 minp = data.blockpos_min * MAP_BLOCKSIZE;
 593                                 v3s16 maxp = data.blockpos_max * MAP_BLOCKSIZE +
 594                                                 v3s16(1,1,1) * (MAP_BLOCKSIZE - 1);
 595
 596                                 /*
 597                                         Ignore map edit events, they will not need to be
 598                                         sent to anybody because the block hasn't been sent
 599                                         to anybody
 600                                 */
 601                                 MapEditEventAreaIgnorer ign(
 602                                                 &m_server->m_ignore_map_edit_events_area,
 603                                                 VoxelArea(minp, maxp));
 604                                 {
 605                                         TimeTaker timer("on_generated");
 606                                         scriptapi_environment_on_generated(m_server->m_lua,
 607                                                         minp, maxp, emerge->getBlockSeed(minp));
 608                                         //int t = timer.stop(true);
 609                                         //dstream<<"on_generated took "<<t<<"ms"<<std::endl;
 610                                 }
 611
 612                                 if (enable_mapgen_debug_info)
 613                                         infostream << "EmergeThread: ended up with: "
 614                                                         << analyze_block(block) << std::endl;
 615
 616                                 // Activate objects and stuff
 617                                 m_server->m_env->activateBlock(block, 0);
 618                         }while(false);
 619                 }
 620
 621                 if(block == NULL)
 622                         got_block = false;
 623
 624                 /*
 625                         Set sent status of modified blocks on clients
 626                 */
 627
 628                 // NOTE: Server's clients are also behind the connection mutex
 629                 JMutexAutoLock lock(m_server->m_con_mutex);
 630
 631                 /*
 632                         Add the originally fetched block to the modified list
 633                 */
 634                 if(got_block)
 635                         modified_blocks.insert(p, block);
 636
 637                 /*
 638                         Set the modified blocks unsent for all the clients
 639                 */
 640                 for(core::map<u16, RemoteClient*>::Iterator
 641                                 i = m_server->m_clients.getIterator();
 642                                 i.atEnd() == false; i++) {
 643                         RemoteClient *client = i.getNode()->getValue();
 644                         if(modified_blocks.size() > 0) {
 645                                 // Remove block from sent history
 646                                 client->SetBlocksNotSent(modified_blocks);
 647                         }
 648                 }
 649
 650
 651 niters++;
 652         }
 653         catch (VersionMismatchException &e) {
 654                 std::ostringstream err;
 655                 err << "World data version mismatch in MapBlock "<<PP(last_tried_pos)<<std::endl;
 656                 err << "----"<<std::endl;
 657                 err << "\""<<e.what()<<"\""<<std::endl;
 658                 err << "See debug.txt."<<std::endl;
 659                 err << "World probably saved by a newer version of Minetest."<<std::endl;
 660                 m_server->setAsyncFatalError(err.str());
 661         }
 662         catch (SerializationError &e) {
 663                 std::ostringstream err;
 664                 err << "Invalid data in MapBlock "<<PP(last_tried_pos)<<std::endl;
 665                 err << "----"<<std::endl;
 666                 err << "\""<<e.what()<<"\""<<std::endl;
 667                 err << "See debug.txt."<<std::endl;
 668                 err << "You can ignore this using [ignore_world_load_errors = true]."<<std::endl;
 669                 m_server->setAsyncFatalError(err.str());
 670         }
 671 printf("emergethread iterated %d times\n", niters);
 672         END_DEBUG_EXCEPTION_HANDLER(errorstream)
 673         log_deregister_thread();
 674         return NULL;
 675 }
 676
 677 #endif