/**
* This function checks whether the given position lies within any of the
* adjacent chunks. Internal chunks are tested first.
*
* @param position The position to test.
* @param chunkID If position is inside one of the adjacent chunks then
* this is set to the id of that chunk. If position is
* not inside any chunks then it is left alone.
* @return True if the point was in the adjacent chunks, false
* otherwise.
*/
bool AdjacentChunkSet::test(const Vector3& position, ChunkID& chunkID) const
{
// dprintf( "Testing point (%f,%f,%f) against adj chunk set:\n",
// position.x, position.y, position.z );
// Test internal chunks first.
for (unsigned int i = 0; i < chunks_.size(); i++)
{
if (chunks_[i].chunkID[8] == 'i' && testChunk(position, i))
{
chunkID = chunks_[i].chunkID;
return true;
}
}
// Test non-internal chunks next.
for (unsigned int i = 0; i < chunks_.size(); i++)
{
if (chunks_[i].chunkID[8] != 'i' && testChunk(position, i))
{
chunkID = chunks_[i].chunkID;
return true;
}
}
// dprintf( "\tNot in any chunk\n" );
return false;
}
int main ( int argc , char *argv[] ) {
if ( argc < 2 || argc > 2 ) {
fprintf(stderr,"quarantine <bytes>\n");
return -1;
}
//mlockall(MCL_FUTURE);
int64_t maxMem = atoi(argv[1]); // 1GB?
int64_t chunkSize = 300000;
int32_t n = 0;
int32_t max = (int32_t)(maxMem / chunkSize) + 10;
char *mem [ max ];
int64_t total = 0LL;
for ( ; ; ) {
mem[n] = (char *)malloc ( chunkSize );
if ( mem[n] == NULL ) break;
total += chunkSize;
n++;
if ( total >= maxMem ) break;
if ( (n % 1000) == 0 )
fprintf(stderr,"quarantine: alloc block #%"INT32"\n",n);
}
fprintf(stderr,
"quarantine: grabbed %"INT32" chunks of ram for "
"total of %"UINT64" : %s\n",
n,total,strerror(errno));
fprintf(stderr,
"quarantine: scanning grabbed mem for errors.\n");
int64_t badRam = 0;
// scan each chunk
for ( int32_t i = 0 ; i < n ; i++ ) {
// erturns true if passes
if ( testChunk ( (unsigned char *)mem[i], chunkSize ) )
free ( mem[i] );
// otherwise do not free it
else {
badRam += chunkSize;
// and lock it up
mlock ( mem[i] , chunkSize );
}
if ( (i % 1000) == 0 )
fprintf(stderr,"quarantine: test block #%"INT32"\n",i);
}
if ( badRam ) {
fprintf(stderr,
"quarantine: quarantining %"UINT64" bytes of bad ram.\n",
badRam);
// sleep forever
for ( ; ; ) sleep ( 100 );
}
fprintf(stderr,"quarantine: all ram was good. exiting.\n");
return 0;
}
