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
  51         qlimit_total    = g_settings->getU16("emergequeue_limit_total");
  52         qlimit_diskonly = g_settings->getU16("emergequeue_limit_diskonly");
  53         qlimit_generate = g_settings->getU16("emergequeue_limit_generate");
  54
  55         queuemutex.Init();
  56         int nthreads = g_settings->get("num_emerge_threads").empty() ?
  57                                         porting::getNumberOfProcessors() :
  58                                         g_settings->getU16("num_emerge_threads");
  59         if (nthreads < 1)
  60                 nthreads = 1;
  61
  62         for (int i = 0; i != nthreads; i++)
  63                 emergethread.push_back(new EmergeThread((Server *)gamedef, i));
  64
  65         infostream << "EmergeManager: using " << nthreads << " threads" << std::endl;
  66 }
  67
  68
  69 EmergeManager::~EmergeManager() {
  70         for (int i = 0; i != emergethread.size(); i++) {
  71                 emergethread[i]->setRun(false);
  72                 emergethread[i]->qevent.signal();
  73                 emergethread[i]->stop();
  74                 delete emergethread[i];
  75                 delete mapgen[i];
  76         }
  77
  78         delete biomedef;
  79         delete params;
  80 }
  81
  82
  83 void EmergeManager::initMapgens(MapgenParams *mgparams) {
  84         Mapgen *mg;
  85
  86         if (mapgen.size())
  87                 return;
  88
  89         this->params = mgparams;
  90         for (int i = 0; i != emergethread.size(); i++) {
  91                 mg = createMapgen(params->mg_name, 0, params);
  92                 if (!mg) {
  93                         infostream << "EmergeManager: falling back to mapgen v6" << std::endl;
  94                         delete params;
  95                         params = createMapgenParams("v6");
  96                         mg = createMapgen("v6", 0, params);
  97                 }
  98                 mapgen.push_back(mg);
  99         }
 100 }
 101
 102
 103 bool EmergeManager::enqueueBlockEmerge(u16 peer_id, v3s16 p, bool allow_generate) {
 104         std::map<v3s16, BlockEmergeData *>::const_iterator iter;
 105         BlockEmergeData *bedata;
 106         u16 count;
 107         u8 flags = 0;
 108         int idx = 0;
 109
 110         if (allow_generate)
 111                 flags |= BLOCK_EMERGE_ALLOWGEN;
 112
 113         {
 114                 JMutexAutoLock queuelock(queuemutex);
 115
 116                 count = blocks_enqueued.size();
 117                 if (count >= qlimit_total)
 118                         return false;
 119
 120                 count = peer_queue_count[peer_id];
 121                 u16 qlimit_peer = allow_generate ? qlimit_generate : qlimit_diskonly;
 122                 if (count >= qlimit_peer)
 123                         return false;
 124
 125                 iter = blocks_enqueued.find(p);
 126                 if (iter != blocks_enqueued.end()) {
 127                         bedata = iter->second;
 128                         bedata->flags |= flags;
 129                         return true;
 130                 }
 131
 132                 bedata = new BlockEmergeData;
 133                 bedata->flags = flags;
 134                 bedata->peer_requested = peer_id;
 135                 blocks_enqueued.insert(std::make_pair(p, bedata));
 136
 137                 peer_queue_count[peer_id] = count + 1;
 138
 139                 int lowestitems = emergethread[0]->blockqueue.size();
 140                 for (int i = 1; i != emergethread.size(); i++) {
 141                         int nitems = emergethread[i]->blockqueue.size();
 142                         if (nitems < lowestitems) {
 143                                 idx = i;
 144                                 lowestitems = nitems;
 145                         }
 146                 }
 147
 148                 emergethread[idx]->blockqueue.push(p);
 149         }
 150         emergethread[idx]->qevent.signal();
 151
 152         return true;
 153 }
 154
 155
 156 bool EmergeThread::popBlockEmerge(v3s16 *pos, u8 *flags) {
 157         std::map<v3s16, BlockEmergeData *>::iterator iter;
 158         JMutexAutoLock queuelock(emerge->queuemutex);
 159
 160         if (blockqueue.empty())
 161                 return false;
 162         v3s16 p = blockqueue.front();
 163         blockqueue.pop();
 164
 165         *pos = p;
 166
 167         iter = emerge->blocks_enqueued.find(p);
 168         if (iter == emerge->blocks_enqueued.end())
 169                 return false; //uh oh, queue and map out of sync!!
 170
 171         BlockEmergeData *bedata = iter->second;
 172         *flags = bedata->flags;
 173
 174         emerge->peer_queue_count[bedata->peer_requested]--;
 175
 176         delete bedata;
 177         emerge->blocks_enqueued.erase(iter);
 178
 179         return true;
 180 }
 181
 182
 183 int EmergeManager::getGroundLevelAtPoint(v2s16 p) {
 184         if (!mapgen[0]) {
 185                 errorstream << "EmergeManager: getGroundLevelAtPoint() called"
 186                 " before mapgen initialized" << std::endl;
 187                 return 0;
 188         }
 189
 190         return mapgen[0]->getGroundLevelAtPoint(p);
 191 }
 192
 193
 194 bool EmergeManager::isBlockUnderground(v3s16 blockpos) {
 195         /*
 196         v2s16 p = v2s16((blockpos.X * MAP_BLOCKSIZE) + MAP_BLOCKSIZE / 2,
 197                                         (blockpos.Y * MAP_BLOCKSIZE) + MAP_BLOCKSIZE / 2);
 198         int ground_level = getGroundLevelAtPoint(p);
 199         return blockpos.Y * (MAP_BLOCKSIZE + 1) <= min(water_level, ground_level);
 200         */
 201
 202         //yuck, but then again, should i bother being accurate?
 203         //the height of the nodes in a single block is quite variable
 204         return blockpos.Y * (MAP_BLOCKSIZE + 1) <= params->water_level;
 205 }
 206
 207
 208 u32 EmergeManager::getBlockSeed(v3s16 p) {
 209         return (u32)(params->seed & 0xFFFFFFFF) +
 210                 p.Z * 38134234 +
 211                 p.Y * 42123 +
 212                 p.Y * 23;
 213 }
 214
 215
 216 Mapgen *EmergeManager::createMapgen(std::string mgname, int mgid,
 217                                                                          MapgenParams *mgparams) {
 218         std::map<std::string, MapgenFactory *>::const_iterator iter;
 219         iter = mglist.find(mgname);
 220         if (iter == mglist.end()) {
 221                 errorstream << "EmergeManager; mapgen " << mgname <<
 222                  " not registered" << std::endl;
 223                 return NULL;
 224         }
 225
 226         MapgenFactory *mgfactory = iter->second;
 227         return mgfactory->createMapgen(mgid, mgparams, this);
 228 }
 229
 230
 231 MapgenParams *EmergeManager::createMapgenParams(std::string mgname) {
 232         std::map<std::string, MapgenFactory *>::const_iterator iter;
 233         iter = mglist.find(mgname);
 234         if (iter == mglist.end()) {
 235                 errorstream << "EmergeManager: mapgen " << mgname <<
 236                  " not registered" << std::endl;
 237                 return NULL;
 238         }
 239
 240         MapgenFactory *mgfactory = iter->second;
 241         return mgfactory->createMapgenParams();
 242 }
 243
 244
 245 MapgenParams *EmergeManager::getParamsFromSettings(Settings *settings) {
 246         std::string mg_name = settings->get("mg_name");
 247         MapgenParams *mgparams = createMapgenParams(mg_name);
 248
 249         mgparams->mg_name     = mg_name;
 250         mgparams->seed        = settings->getU64(settings == g_settings ? "fixed_map_seed" : "seed");
 251         mgparams->water_level = settings->getS16("water_level");
 252         mgparams->chunksize   = settings->getS16("chunksize");
 253         mgparams->flags       = settings->getFlagStr("mg_flags", flagdesc_mapgen);
 254
 255         if (!mgparams->readParams(settings)) {
 256                 delete mgparams;
 257                 return NULL;
 258         }
 259         return mgparams;
 260 }
 261
 262
 263 void EmergeManager::setParamsToSettings(Settings *settings) {
 264         settings->set("mg_name",         params->mg_name);
 265         settings->setU64("seed",         params->seed);
 266         settings->setS16("water_level",  params->water_level);
 267         settings->setS16("chunksize",    params->chunksize);
 268         settings->setFlagStr("mg_flags", params->flags, flagdesc_mapgen);
 269
 270         params->writeParams(settings);
 271 }
 272
 273
 274 bool EmergeManager::registerMapgen(std::string mgname, MapgenFactory *mgfactory) {
 275         mglist.insert(std::make_pair(mgname, mgfactory));
 276         infostream << "EmergeManager: registered mapgen " << mgname << std::endl;
 277 }
 278
 279
 280
 281 class MapEditEventIgnorer
 282 {
 283 public:
 284         MapEditEventIgnorer(bool *flag):
 285                 m_flag(flag)
 286         {
 287                 if(*m_flag == false)
 288                         *m_flag = true;
 289                 else
 290                         m_flag = NULL;
 291         }
 292
 293         ~MapEditEventIgnorer()
 294         {
 295                 if(m_flag)
 296                 {
 297                         assert(*m_flag);
 298                         *m_flag = false;
 299                 }
 300         }
 301
 302 private:
 303         bool *m_flag;
 304 };
 305
 306 class MapEditEventAreaIgnorer
 307 {
 308 public:
 309         MapEditEventAreaIgnorer(VoxelArea *ignorevariable, const VoxelArea &a):
 310                 m_ignorevariable(ignorevariable)
 311         {
 312                 if(m_ignorevariable->getVolume() == 0)
 313                         *m_ignorevariable = a;
 314                 else
 315                         m_ignorevariable = NULL;
 316         }
 317
 318         ~MapEditEventAreaIgnorer()
 319         {
 320                 if(m_ignorevariable)
 321                 {
 322                         assert(m_ignorevariable->getVolume() != 0);
 323                         *m_ignorevariable = VoxelArea();
 324                 }
 325         }
 326
 327 private:
 328         VoxelArea *m_ignorevariable;
 329 };
 330
 331
 332 #if 1
 333
 334 #define EMERGE_DBG_OUT(x) \
 335         { if (enable_mapgen_debug_info) \
 336         infostream << "EmergeThread: " x << std::endl; }
 337
 338 bool EmergeThread::getBlockOrStartGen(v3s16 p, MapBlock **b,
 339                                                                         BlockMakeData *data, bool allow_gen) {
 340         v2s16 p2d(p.X, p.Z);
 341         //envlock: usually takes <=1ms, sometimes 90ms or ~400ms to acquire
 342         JMutexAutoLock envlock(m_server->m_env_mutex);
 343
 344         // Load sector if it isn't loaded
 345         if (map->getSectorNoGenerateNoEx(p2d) == NULL)
 346                 map->loadSectorMeta(p2d);
 347
 348         // Attempt to load block
 349         MapBlock *block = map->getBlockNoCreateNoEx(p);
 350         if (!block || block->isDummy() || !block->isGenerated()) {
 351                 EMERGE_DBG_OUT("not in memory, attempting to load from disk");
 352                 block = map->loadBlock(p);
 353         }
 354
 355         // If could not load and allowed to generate,
 356         // start generation inside this same envlock
 357         if (allow_gen && (block == NULL || !block->isGenerated())) {
 358                 EMERGE_DBG_OUT("generating");
 359                 map->initBlockMake(data, p);
 360                 return true;
 361         }
 362
 363         *b = block;
 364         return false;
 365 }
 366
 367
 368 void *EmergeThread::Thread() {
 369         ThreadStarted();
 370         log_register_thread("EmergeThread");
 371         DSTACK(__FUNCTION_NAME);
 372         BEGIN_DEBUG_EXCEPTION_HANDLER
 373
 374         v3s16 last_tried_pos(-32768,-32768,-32768); // For error output
 375         v3s16 p;
 376         u8 flags;
 377
 378         map    = (ServerMap *)&(m_server->m_env->getMap());
 379         emerge = m_server->m_emerge;
 380         mapgen = emerge->mapgen[id]; //emerge->getMapgen();
 381
 382         while (getRun())
 383         try {
 384                 while (!popBlockEmerge(&p, &flags)) {
 385                         qevent.wait();
 386                         if (!getRun())
 387                                 goto exit_emerge_loop;
 388                 }
 389
 390                 last_tried_pos = p;
 391                 if (blockpos_over_limit(p))
 392                         continue;
 393
 394                 bool allow_generate = flags & BLOCK_EMERGE_ALLOWGEN;
 395                 EMERGE_DBG_OUT("p=" PP(p) " allow_generate=" << allow_generate);
 396
 397                 /*
 398                         Try to fetch block from memory or disk.
 399                         If not found and asked to generate, initialize generator.
 400                 */
 401                 BlockMakeData data;
 402                 MapBlock *block = NULL;
 403                 core::map<v3s16, MapBlock *> modified_blocks;
 404
 405                 if (getBlockOrStartGen(p, &block, &data, allow_generate)) {
 406                         {
 407                                 ScopeProfiler sp(g_profiler, "EmergeThread: Mapgen::makeChunk", SPT_AVG);
 408                                 TimeTaker t("mapgen::make_block()");
 409
 410                                 mapgen->makeChunk(&data);
 411
 412                                 if (enable_mapgen_debug_info == false)
 413                                         t.stop(true); // Hide output
 414                         }
 415
 416                         {
 417                                 //envlock: usually 0ms, but can take either 30 or 400ms to acquire
 418                                 JMutexAutoLock envlock(m_server->m_env_mutex);
 419                                 ScopeProfiler sp(g_profiler, "EmergeThread: after "
 420                                                 "Mapgen::makeChunk (envlock)", SPT_AVG);
 421
 422                                 map->finishBlockMake(&data, modified_blocks);
 423
 424                                 block = map->getBlockNoCreateNoEx(p);
 425                                 if (block) {
 426                                         /*
 427                                                 Do some post-generate stuff
 428                                         */
 429                                         v3s16 minp = data.blockpos_min * MAP_BLOCKSIZE;
 430                                         v3s16 maxp = data.blockpos_max * MAP_BLOCKSIZE +
 431                                                                  v3s16(1,1,1) * (MAP_BLOCKSIZE - 1);
 432
 433                                         // Ignore map edit events, they will not need to be sent
 434                                         // to anybody because the block hasn't been sent to anybody
 435                                         MapEditEventAreaIgnorer
 436                                                 ign(&m_server->m_ignore_map_edit_events_area,
 437                                                 VoxelArea(minp, maxp));
 438                                         {  // takes about 90ms with -O1 on an e3-1230v2
 439                                                 scriptapi_environment_on_generated(m_server->m_lua,
 440                                                                 minp, maxp, emerge->getBlockSeed(minp));
 441                                         }
 442
 443                                         EMERGE_DBG_OUT("ended up with: " << analyze_block(block));
 444
 445                                         m_server->m_env->activateBlock(block, 0);
 446                                 }
 447                         }
 448                 }
 449
 450                 /*
 451                         Set sent status of modified blocks on clients
 452                 */
 453
 454                 // NOTE: Server's clients are also behind the connection mutex
 455                 //conlock: consistently takes 30-40ms to acquire
 456                 JMutexAutoLock lock(m_server->m_con_mutex);
 457                 // Add the originally fetched block to the modified list
 458                 if (block)
 459                         modified_blocks.insert(p, block);
 460
 461                 // Set the modified blocks unsent for all the clients
 462                 for (core::map<u16, RemoteClient*>::Iterator
 463                          i = m_server->m_clients.getIterator();
 464                          i.atEnd() == false; i++) {
 465                         RemoteClient *client = i.getNode()->getValue();
 466                         if (modified_blocks.size() > 0) {
 467                                 // Remove block from sent history
 468                                 client->SetBlocksNotSent(modified_blocks);
 469                         }
 470                 }
 471         }
 472         catch (VersionMismatchException &e) {
 473                 std::ostringstream err;
 474                 err << "World data version mismatch in MapBlock "<<PP(last_tried_pos)<<std::endl;
 475                 err << "----"<<std::endl;
 476                 err << "\""<<e.what()<<"\""<<std::endl;
 477                 err << "See debug.txt."<<std::endl;
 478                 err << "World probably saved by a newer version of Minetest."<<std::endl;
 479                 m_server->setAsyncFatalError(err.str());
 480         }
 481         catch (SerializationError &e) {
 482                 std::ostringstream err;
 483                 err << "Invalid data in MapBlock "<<PP(last_tried_pos)<<std::endl;
 484                 err << "----"<<std::endl;
 485                 err << "\""<<e.what()<<"\""<<std::endl;
 486                 err << "See debug.txt."<<std::endl;
 487                 err << "You can ignore this using [ignore_world_load_errors = true]."<<std::endl;
 488                 m_server->setAsyncFatalError(err.str());
 489         }
 490
 491         END_DEBUG_EXCEPTION_HANDLER(errorstream)
 492 exit_emerge_loop:
 493         log_deregister_thread();
 494         return NULL;
 495 }
 496
 497 #else
 498
 499 void *EmergeThread::Thread() {
 500         ThreadStarted();
 501         log_register_thread("EmergeThread");
 502         DSTACK(__FUNCTION_NAME);
 503         BEGIN_DEBUG_EXCEPTION_HANDLER
 504
 505         bool enable_mapgen_debug_info = g_settings->getBool("enable_mapgen_debug_info");
 506
 507         v3s16 last_tried_pos(-32768,-32768,-32768); // For error output
 508         ServerMap &map = ((ServerMap&)m_server->m_env->getMap());
 509         EmergeManager *emerge = m_server->m_emerge;
 510         Mapgen *mapgen = emerge->getMapgen();
 511
 512         while(getRun())
 513         try {
 514                 QueuedBlockEmerge *qptr = m_server->m_emerge_queue.pop();
 515                 if(qptr == NULL)
 516                         break;
 517                 SharedPtr<QueuedBlockEmerge> q(qptr);
 518
 519                 v3s16 &p = q->pos;
 520                 v2s16 p2d(p.X,p.Z);
 521
 522                 last_tried_pos = p;
 523
 524                 /*
 525                         Do not generate over-limit
 526                 */
 527                 if (blockpos_over_limit(p))
 528                         continue;
 529
 530                 //infostream<<"EmergeThread::Thread(): running"<<std::endl;
 531
 532                 //TimeTaker timer("block emerge");
 533
 534                 /*
 535                         Try to emerge it from somewhere.
 536
 537                         If it is only wanted as optional, only loading from disk
 538                         will be allowed.
 539                 */
 540
 541                 /*
 542                         Check if any peer wants it as non-optional. In that case it
 543                         will be generated.
 544
 545                         Also decrement the emerge queue count in clients.
 546                 */
 547
 548                 bool only_from_disk = true;
 549                 {
 550                         core::map<u16, u8>::Iterator i;
 551                         for (i=q->s.getIterator(); !i.atEnd(); i++) {
 552                                 u8 flags = i.getNode()->getValue();
 553                                 if (!(flags & BLOCK_EMERGE_FLAG_FROMDISK)) {
 554                                         only_from_disk = false;
 555                                         break;
 556                                 }
 557                         }
 558                 }
 559
 560                 if (enable_mapgen_debug_info)
 561                         infostream<<"EmergeThread: p="
 562                                         <<"("<<p.X<<","<<p.Y<<","<<p.Z<<") "
 563                                         <<"only_from_disk="<<only_from_disk<<std::endl;
 564
 565                 MapBlock *block = NULL;
 566                 bool got_block = true;
 567                 core::map<v3s16, MapBlock*> modified_blocks;
 568
 569                 /*
 570                         Try to fetch block from memory or disk.
 571                         If not found and asked to generate, initialize generator.
 572                 */
 573
 574                 bool started_generate = false;
 575                 BlockMakeData data;
 576                 {
 577                         JMutexAutoLock envlock(m_server->m_env_mutex);
 578
 579                         // Load sector if it isn't loaded
 580                         if(map.getSectorNoGenerateNoEx(p2d) == NULL)
 581                                 map.loadSectorMeta(p2d);
 582
 583                         // Attempt to load block
 584                         block = map.getBlockNoCreateNoEx(p);
 585                         if(!block || block->isDummy() || !block->isGenerated()) {
 586                                 if(enable_mapgen_debug_info)
 587                                         infostream<<"EmergeThread: not in memory, "
 588                                                         <<"attempting to load from disk"<<std::endl;
 589
 590                                 block = map.loadBlock(p);
 591                         }
 592
 593                         // If could not load and allowed to generate, start generation
 594                         // inside this same envlock
 595                         if(only_from_disk == false &&
 596                                         (block == NULL || block->isGenerated() == false)){
 597                                 if(enable_mapgen_debug_info)
 598                                         infostream<<"EmergeThread: generating"<<std::endl;
 599                                 started_generate = true;
 600
 601                                 map.initBlockMake(&data, p);
 602                         }
 603                 }
 604
 605                 /*
 606                         If generator was initialized, generate now when envlock is free.
 607                 */
 608                 if(started_generate) {
 609                         {
 610                                 ScopeProfiler sp(g_profiler, "EmergeThread: mapgen::make_block",
 611                                                 SPT_AVG);
 612                                 TimeTaker t("mapgen::make_block()");
 613
 614                                 mapgen->makeChunk(&data);
 615
 616                                 if (enable_mapgen_debug_info == false)
 617                                         t.stop(true); // Hide output
 618                         }
 619
 620                         do{ // enable break
 621                                 // Lock environment again to access the map
 622                                 JMutexAutoLock envlock(m_server->m_env_mutex);
 623
 624                                 ScopeProfiler sp(g_profiler, "EmergeThread: after "
 625                                                 "mapgen::make_block (envlock)", SPT_AVG);
 626
 627                                 // Blit data back on map, update lighting, add mobs and
 628                                 // whatever this does
 629                                 map.finishBlockMake(&data, modified_blocks);
 630
 631                                 // Get central block
 632                                 block = map.getBlockNoCreateNoEx(p);
 633
 634                                 // If block doesn't exist, don't try doing anything with it
 635                                 // This happens if the block is not in generation boundaries
 636                                 if(!block)
 637                                         break;
 638
 639                                 /*
 640                                         Do some post-generate stuff
 641                                 */
 642                                 v3s16 minp = data.blockpos_min * MAP_BLOCKSIZE;
 643                                 v3s16 maxp = data.blockpos_max * MAP_BLOCKSIZE +
 644                                                 v3s16(1,1,1) * (MAP_BLOCKSIZE - 1);
 645
 646                                 /*
 647                                         Ignore map edit events, they will not need to be
 648                                         sent to anybody because the block hasn't been sent
 649                                         to anybody
 650                                 */
 651                                 MapEditEventAreaIgnorer ign(
 652                                                 &m_server->m_ignore_map_edit_events_area,
 653                                                 VoxelArea(minp, maxp));
 654                                 {
 655                                         TimeTaker timer("on_generated");
 656                                         scriptapi_environment_on_generated(m_server->m_lua,
 657                                                         minp, maxp, emerge->getBlockSeed(minp));
 658                                         //int t = timer.stop(true);
 659                                         //dstream<<"on_generated took "<<t<<"ms"<<std::endl;
 660                                 }
 661
 662                                 if (enable_mapgen_debug_info)
 663                                         infostream << "EmergeThread: ended up with: "
 664                                                         << analyze_block(block) << std::endl;
 665
 666                                 // Activate objects and stuff
 667                                 m_server->m_env->activateBlock(block, 0);
 668                         }while(false);
 669                 }
 670
 671                 if(block == NULL)
 672                         got_block = false;
 673
 674                 /*
 675                         Set sent status of modified blocks on clients
 676                 */
 677
 678                 // NOTE: Server's clients are also behind the connection mutex
 679                 JMutexAutoLock lock(m_server->m_con_mutex);
 680
 681                 /*
 682                         Add the originally fetched block to the modified list
 683                 */
 684                 if(got_block)
 685                         modified_blocks.insert(p, block);
 686
 687                 /*
 688                         Set the modified blocks unsent for all the clients
 689                 */
 690                 for(core::map<u16, RemoteClient*>::Iterator
 691                                 i = m_server->m_clients.getIterator();
 692                                 i.atEnd() == false; i++) {
 693                         RemoteClient *client = i.getNode()->getValue();
 694                         if(modified_blocks.size() > 0) {
 695                                 // Remove block from sent history
 696                                 client->SetBlocksNotSent(modified_blocks);
 697                         }
 698                 }
 699
 700
 701 niters++;
 702         }
 703         catch (VersionMismatchException &e) {
 704                 std::ostringstream err;
 705                 err << "World data version mismatch in MapBlock "<<PP(last_tried_pos)<<std::endl;
 706                 err << "----"<<std::endl;
 707                 err << "\""<<e.what()<<"\""<<std::endl;
 708                 err << "See debug.txt."<<std::endl;
 709                 err << "World probably saved by a newer version of Minetest."<<std::endl;
 710                 m_server->setAsyncFatalError(err.str());
 711         }
 712         catch (SerializationError &e) {
 713                 std::ostringstream err;
 714                 err << "Invalid data in MapBlock "<<PP(last_tried_pos)<<std::endl;
 715                 err << "----"<<std::endl;
 716                 err << "\""<<e.what()<<"\""<<std::endl;
 717                 err << "See debug.txt."<<std::endl;
 718                 err << "You can ignore this using [ignore_world_load_errors = true]."<<std::endl;
 719                 m_server->setAsyncFatalError(err.str());
 720         }
 721 printf("emergethread iterated %d times\n", niters);
 722         END_DEBUG_EXCEPTION_HANDLER(errorstream)
 723         log_deregister_thread();
 724         return NULL;
 725 }
 726
 727 #endif