1 // FGTileLoader - Queue scenery tiles for loading.
3 // Written by Bernie Bright, started March 2001.
5 // Copyright (C) 2001 Bernard Bright - bbright@bigpond.net.au
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 #include <simgear/compiler.h>
29 #include <Main/globals.hxx>
30 #include "FGTileLoader.hxx"
31 #include "tileentry.hxx"
32 #include "tilemgr.hxx"
34 extern ssgBranch *terrain;
35 extern ssgBranch *ground;
41 FGTileLoader::FGTileLoader()
43 #if defined(ENABLE_THREADS) && ENABLE_THREADS
44 // Create and start the loader threads.
45 for (int i = 0; i < MAX_THREADS; ++i)
47 threads[i] = new LoaderThread(this);
50 #endif // ENABLE_THREADS
54 * Terminate all threads.
56 FGTileLoader::~FGTileLoader()
58 #if defined(ENABLE_THREADS) && ENABLE_THREADS
59 // Wake up its time to die.
60 // queue_cond.broadcast();
62 for (int i = 0; i < MAX_THREADS; ++i)
67 #endif // ENABLE_THREADS
71 #if 0 // we don't ever want to do this I don't think
75 void FGTileLoader::reinit() {
76 while ( !tile_load_queue.empty() ) {
77 tile_load_queue.pop();
87 FGTileLoader::add( FGTileEntry* tile )
90 * Initialise tile_path here and not in ctor to avoid problems
91 * with the initialisation order of global objects.
93 static bool beenhere = false;
95 tile_path = globals->get_fg_scenery();
99 tile_load_queue.push( tile );
102 #ifdef WISH_PLIB_WAS_THREADED // but it isn't
107 FGTileLoader::remove( FGTileEntry* tile )
109 tile_free_queue.push( tile );
117 FGTileLoader::update()
120 #if defined(ENABLE_THREADS) && ENABLE_THREADS
121 // send a signal to the pager thread that it is allowed to load
127 if ( !tile_load_queue.empty() ) {
128 // cout << "loading next tile ..." << endl;
129 // load the next tile in the queue
130 FGTileEntry* tile = tile_load_queue.front();
131 tile_load_queue.pop();
133 tile->load( tile_path, true );
135 FGTileMgr::ready_to_attach( tile );
138 #ifdef WISH_PLIB_WAS_THREADED // but it isn't
139 if ( !tile_free_queue.empty() ) {
140 // cout << "freeing next tile ..." << endl;
141 // free the next tile in the queue
142 FGTileEntry* tile = tile_free_queue.front();
143 tile_free_queue.pop();
149 #endif // ENABLE_THREADS
154 #if defined(ENABLE_THREADS) && ENABLE_THREADS
159 FGTileLoader::LoaderThread::run()
161 pthread_cleanup_push( cleanup_handler, loader );
163 // Wait for a load request to be placed in the queue.
164 FGTileEntry* tile = loader->tile_load_queue.pop();
166 // Wait for the next frame signal before we load a tile from the queue
167 loader->mutex.lock();
168 loader->frame_cond.wait( loader->mutex );
169 loader->mutex.unlock();
171 set_cancel( SGThread::CANCEL_DISABLE );
172 tile->load( loader->tile_path, true );
173 set_cancel( SGThread::CANCEL_DEFERRED );
175 FGTileMgr::ready_to_attach( tile );
177 #ifdef WISH_PLIB_WAS_THREADED // but it isn't
178 // Handle and pending removals
179 while ( !loader->tile_free_queue.empty() ) {
180 // cout << "freeing next tile ..." << endl;
181 // free the next tile in the queue
182 FGTileEntry* tile = loader->tile_free_queue.pop();
189 pthread_cleanup_pop(1);
193 * Ensure mutex is unlocked.
196 cleanup_handler( void* arg )
198 FGTileLoader* loader = (FGTileLoader*) arg;
199 loader->mutex.unlock();
201 #endif // ENABLE_THREADS