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#include "MemoryLeak.h"
#include "cChunkGenerator.h"
#include "cChunkMap.h"
#include "cChunk.h"
#include "cWorld.h"
#include "cThread.h"
#include "cCriticalSection.h"
#include "cSemaphore.h"
#include "cMCLogger.h"
#include <list>
typedef std::pair<int, int> ChunkCoord;
typedef std::list< ChunkCoord > ChunkCoordList;
#define MAX_SEMAPHORES 1000
struct cChunkGenerator::sChunkGeneratorState
{
sChunkGeneratorState()
: pCriticalSection( 0 )
, pSemaphore( 0 )
, pThread( 0 )
, bStop( false )
, bCurrentlyGenerating( false )
, pCurrentlyGenerating( false )
, pChunkCriticalSection( 0 )
{}
ChunkCoordList GenerateQueue; // Protected by pCriticalSection
ChunkCoord CurrentlyGeneratingCoords; // Protected by pCriticalSection
cChunk* pCurrentlyGenerating; // Protected by pCriticalSection
bool bCurrentlyGenerating; // Protected by pCriticalSection
cCriticalSection* pCriticalSection;
cSemaphore* pSemaphore;
cThread* pThread;
cCriticalSection* pChunkCriticalSection;// Specially for protecting the actual chunk that is currently being generated, and not just the variables in this struct
bool bStop;
};
cChunkGenerator::cChunkGenerator( cChunkMap* a_pChunkMap )
: m_pState( new sChunkGeneratorState )
, m_pChunkMap( a_pChunkMap )
{
m_pState->pCriticalSection = new cCriticalSection();
m_pState->pSemaphore = new cSemaphore( MAX_SEMAPHORES, 0 );
m_pState->pChunkCriticalSection = new cCriticalSection();
m_pState->pThread = new cThread( GenerateThread, this, "cChunkGenerator::GenerateThread" );
m_pState->pThread->Start( true );
}
cChunkGenerator::~cChunkGenerator()
{
m_pState->bStop = true;
m_pState->pSemaphore->Signal(); // Signal so thread can continue and exit
delete m_pState->pThread;
delete m_pState->pSemaphore;
delete m_pState->pCriticalSection;
delete m_pState->pChunkCriticalSection;
delete m_pState; m_pState = 0;
}
void cChunkGenerator::GenerateChunk( int a_X, int a_Z )
{
m_pState->pCriticalSection->Lock();
if( m_pState->bCurrentlyGenerating )
{
if( m_pState->CurrentlyGeneratingCoords.first == a_X && m_pState->CurrentlyGeneratingCoords.second == a_Z )
{
m_pState->pCriticalSection->Unlock();
return; // Already generating this chunk, so ignore
}
}
int SizeBefore = m_pState->GenerateQueue.size();
m_pState->GenerateQueue.remove( ChunkCoord(a_X, a_Z) );
if( m_pState->GenerateQueue.size() >= MAX_SEMAPHORES )
{
LOGWARN("WARNING: Can't add chunk (%i, %i) to generation queue: Queue is too big! (%i)", a_X, a_Z, m_pState->GenerateQueue.size() );
m_pState->pCriticalSection->Unlock();
return;
}
m_pState->GenerateQueue.push_back( ChunkCoord(a_X, a_Z) );
int SizeAfter = m_pState->GenerateQueue.size();
m_pState->pCriticalSection->Unlock();
if( SizeBefore < SizeAfter )
m_pState->pSemaphore->Signal();
}
void cChunkGenerator::GenerateThread( void* a_Params )
{
// Cache some values for easy access (they are all references/pointers)
cChunkGenerator* self = (cChunkGenerator*)a_Params;
sChunkGeneratorState* m_pState = self->m_pState;
ChunkCoordList& GenerateQueue = m_pState->GenerateQueue;
cChunkMap& ChunkMap = *self->m_pChunkMap;
cCriticalSection& CriticalSection = *m_pState->pCriticalSection;
cSemaphore& Semaphore = *m_pState->pSemaphore;
while( !m_pState->bStop )
{
Semaphore.Wait();
if( m_pState->bStop ) break;
CriticalSection.Lock();
if( GenerateQueue.size() == 0 )
{
if( !m_pState->bStop ) LOGERROR("ERROR: Semaphore was signaled while GenerateQueue.size == 0");
CriticalSection.Unlock();
continue;
}
ChunkCoord coord = *GenerateQueue.begin(); // Get next coord from queue
GenerateQueue.erase( GenerateQueue.begin() ); // Remove coordinate from queue
m_pState->bCurrentlyGenerating = true;
m_pState->CurrentlyGeneratingCoords = coord;
CriticalSection.Unlock(); // Unlock ASAP
ChunkMap.GetWorld()->LockChunks();
if( ChunkMap.GetChunk( coord.first, 0, coord.second ) ) // Make sure it has not been loaded in the meantime. Don't want to generate the same chunk twice
{ // This is possible when forcing the server to generate a chunk in the main thread
ChunkMap.GetWorld()->UnlockChunks();
continue;
}
ChunkMap.GetWorld()->UnlockChunks();
LOGINFO("cChunkGenerator generating chunk %i %i", coord.first, coord.second );
cChunk* Chunk = new cChunk( coord.first, 0, coord.second, ChunkMap.GetWorld() );
CriticalSection.Lock();
m_pState->pCurrentlyGenerating = Chunk;
CriticalSection.Unlock();
self->Lock(); // Protect the actual chunk
Chunk->Initialize(); // Generate the chunk
self->Unlock();
ChunkMap.GetWorld()->LockChunks();
ChunkMap.AddChunk( Chunk );
ChunkMap.GetWorld()->UnlockChunks();
CriticalSection.Lock();
m_pState->bCurrentlyGenerating = false;
m_pState->pCurrentlyGenerating = 0;
CriticalSection.Unlock();
}
}
cChunk* cChunkGenerator::GetCurrentlyGenerating()
{
return m_pState->pCurrentlyGenerating;
}
void cChunkGenerator::Lock()
{
m_pState->pChunkCriticalSection->Lock();
}
void cChunkGenerator::Unlock()
{
m_pState->pChunkCriticalSection->Unlock();
}
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