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