// stop background thread
void datacloud::stopthread(int background)
{
int i;
if (!ISNOTREADY) return;
if (background==0)
// stop all threads
{
signalthread();
for (i=1; i<=MAXTHREADS; i++) stopthread(i);
}
else
// join thread if it is still running
if (!ISREADY[background])
{
SHOULDSTOP[background]=TRUE;
JOIN_CALLBACK(&BACKARRAY[background],START_DATA);
SHOULDSTOP[background]=FALSE;
ISREADY[background]=TRUE;
NUMTHREADS--;
}
if (NUMTHREADS==0) ISNOTREADY=FALSE;
}
// signal background thread to finish
void datacloud::signalthread(int background)
{
int i;
if (!ISNOTREADY) return;
if (background==0)
// signal all threads to finish
for (i=1; i<=MAXTHREADS; i++) signalthread(i);
else
// signal thread if it is still running
if (!ISREADY[background]) SHOULDSTOP[background]=TRUE;
}
// insert a tile into the cache
tilecacheelem *datacloud::inserttile(const unsigned char *tileid,int col,int row,BOOLINT istexture,BOOLINT immediate,BOOLINT loprio,int lod)
{
tilecacheelem *oldtile,*newtile;
// check for already existing tile
oldtile=checktile(tileid,col,row,istexture,immediate,loprio,lod);
// lock critical section
if (ISNOTREADY) LOCK_CALLBACK(START_DATA);
// already existing tile
if (oldtile!=NULL)
{
oldtile->refcount++;
newtile=oldtile;
}
// allocate and initialize new tile
else
{
newtile=new tilecacheelem;
newtile->tileid=(unsigned char *)strdup((char *)tileid);
newtile->tile=new databuf;
newtile->col=col;
newtile->row=row;
newtile->istexture=istexture;
newtile->loprio=loprio;
newtile->lod=lod;
newtile->refcount=1;
newtile->isavailable=FALSE;
newtile->isloading=FALSE;
newtile->background=0;
}
// load immediate data
if (immediate && !newtile->isavailable)
{
// signal background thread to finish
signalthread();
// check if actual tile is already being loaded in the background
if (newtile->isloading)
{
// unlock critical section
if (ISNOTREADY) UNLOCK_CALLBACK(START_DATA);
// wait for background thread to finish loading
stopthread(newtile->background);
// relock critical section
if (ISNOTREADY) LOCK_CALLBACK(START_DATA);
}
// load actual tile directly
if (!newtile->isavailable)
{
// load in foreground
loadtile(newtile);
// decrease pending tile count
if (oldtile!=NULL) PENDINGTILES--;
}
}
// reset access time
newtile->access=gettime();
newtile->isdelayed=FALSE;
// unlock critical section
if (ISNOTREADY) UNLOCK_CALLBACK(START_DATA);
// insert tile at cache tail
if (oldtile==NULL) inserttile(TILECACHETAIL,newtile);
return(newtile);
}
// insert a tile into the cache
tilecacheelem *datacloud::inserttile(unsigned char *tileid,int col,int row,BOOLINT istexture,BOOLINT immediate,BOOLINT loprio)
{
int i;
tilecacheelem *oldtile,*newtile;
// check for already existing tile
oldtile=checktile(tileid,col,row,istexture,immediate,loprio);
// already existing tile
if (oldtile!=NULL)
{
newtile=oldtile;
newtile->refcount++;
}
// allocate and initialize new tile
else
{
newtile=new tilecacheelem;
newtile->tileid=(unsigned char *)strdup((char *)tileid);
newtile->tile=new databuf;
newtile->col=col;
newtile->row=row;
newtile->istexture=istexture;
newtile->loprio=loprio;
newtile->refcount=1;
newtile->isavailable=FALSE;
newtile->isloading=FALSE;
newtile->background=0;
}
// lock critical section
if (ISNOTREADY) LOCK_CALLBACK(START_DATA);
// load immediate data
if (immediate && !newtile->isavailable)
{
// signal background thread to finish
signalthread();
// check if actual tile is already being loaded in the background
if (newtile->isloading)
{
// unlock critical section
if (ISNOTREADY) UNLOCK_CALLBACK(START_DATA);
// wait for background thread to finish loading
stopthread(newtile->background);
// relock critical section
if (ISNOTREADY) LOCK_CALLBACK(START_DATA);
}
// load actual tile directly
if (!newtile->isavailable)
{
// signal direct loading
newtile->isloading=TRUE;
// unlock critical section
if (ISNOTREADY) UNLOCK_CALLBACK(START_DATA);
// lock io
if (ISNOTREADY)
if (CONFIGURE_AUTOLOCKIO!=0)
if (LOCKIO_CALLBACK!=NULL) LOCKIO_CALLBACK(START_DATA);
// load data
REQUEST_CALLBACK(tileid,newtile->tile,istexture,0,REQUEST_DATA);
// autocompress textures
if (CONFIGURE_AUTOCOMPRESS!=0) newtile->tile->autocompress();
// unlock io
if (ISNOTREADY)
if (CONFIGURE_AUTOLOCKIO!=0)
if (LOCKIO_CALLBACK!=NULL) UNLOCKIO_CALLBACK(START_DATA);
// relock critical section
if (ISNOTREADY) LOCK_CALLBACK(START_DATA);
// signal availability
newtile->isavailable=TRUE;
newtile->isloading=FALSE;
// decrease pending tile count
if (oldtile!=NULL) PENDINGTILES--;
}
}
// unlock critical section
if (ISNOTREADY) UNLOCK_CALLBACK(START_DATA);
// set access time
newtile->access=minitime();
// insert tile at cache tail
if (oldtile==NULL) inserttile(TILECACHETAIL,newtile);
return(newtile);
}