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Run top: Is there a process that s chewing up all or a lot of the CPU If so, depending on what it is, you may be able just to kill it. Run ps -A: Are there lots of defunct processes This can mean various things, but resolving whatever is happening may help you find what your bug is. Run date: Check that the time is correct. Especially if you re using Kerberos, it s important that the time on the local machine matches the time on the server to within a few minutes. Restart X: This is another in the crude but often effective box. Use /etc/init.d/gdm restart (if you use the GDM display manager; otherwise, replace as appropriate), or hit Ctrl-Alt-Backspace from the display. Switch to a console (Ctrl-Alt-F1), and log in as root: Are there general login issues This should show up if there are serious login problems. Switch to a console (Ctrl-Alt-F1), and log in as yourself, a test user, or another user (or use su): Again, this may show up general login issues, in which case you may want to take another look at whether your servers are up and responding. Run iostat -dxk 5: This will give you a quick view of what the disk I/O is doing. -x gives an extended report, -d shows device utilization, -k shows KB per second rather than bytes per second, and 5 refreshes every five seconds.

Listing 11 10. Determine if a Tile Is Blocked -(bool) isTilePosBlocked:(CGPoint)tilePos tileMap:(CCTMXTiledMap*)tileMap { CCTMXLayer* layer = [tileMap layerNamed:@"Collisions"]; NSAssert(layer != nil, @"Collisions layer not found!"); bool isBlocked = NO; unsigned int tileGID = [layer tileGIDAt:tilePos]; if (tileGID > 0) { NSDictionary* tileProperties = [tileMap propertiesForGID:tileGID]; id blocks_movement = [tileProperties objectForKey:@"blocks_movement"]; isBlocked = (blocks_movement != nil); } return isBlocked; }

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The IS NULL operator has only one operand: the preceding column name (or column expression). Actually, it is a pity that this operator is not written as IS_NULL (with an underscore instead of a space) to stress the fact that this operator has just a single operand. In contrast, the equality operator (=) has two operands: a left operand and a right one. Watch the rather subtle syntax difference between the following two queries: SQL> select * from registrations where evaluation IS null SQL> select * from registrations where evaluation = null If you were to read both queries aloud, you might not even hear any difference. However, the seemingly innocent syntax change has definite consequences for the query results. They don t produce error messages, because both queries are syntactically correct. If one (or both) of the operands being compared by the equality comparison operator (=) evaluates to a null value, the result is UNKNOWN. In other words, you cannot say that a null value is equal to a null value. The following shows the conclusions:

The code first tries to get a tile at the given tile coordinate from the Collisions layer. If there is no tile there, the tileGID will be 0 and we can safely assume that this tile is not blocked. But if there is a valid tileGID at the tilePos coordinate, the tileMap is queried for the properties of the tile, which returns an NSDictionary object. If the dictionary s objectForKey method returns a valid object for the key named blocks_movement, the tile is blocked. The place to check for collision is in the update method, as shown in Listing 11 11.

diff is handy if you re comparing config files from two separate machines. Copy the second file to the first machine (this example uses the /etc/hosts file): scp client1:/etc/hosts hosts-client1

This explains why the query in Listing 4-43 doesn t return all 14 rows of the EMPLOYEES table. Listing 4-43. Example of a Counterintuitive WHERE Clause SQL> select ename, init 2 from employees 3 where comm = comm; ENAME -------ALLEN WARD MARTIN TURNER SQL> In mathematical logic, we call expressions always evaluating to TRUE a tautology. The example in Listing 4-43 shows that certain trivial tautologies from two-valued logic (such as COMM = COMM) don t hold true in SQL. INIT ----JAM TF P JJ

Listing 11 11. Checking for Collision in the update Method -(void) update:(ccTime)delta { // if the tilemap is currently being moved, wait until it's done moving if ([tileMap numberOfRunningActions] == 0) { if (currentMoveDirection != MoveDirectionNone) { CGPoint tilePos = [self tilePosFromLocation:screenCenter tileMap:tileMap]; CGPoint offset = moveOffsets[currentMoveDirection]; tilePos = CGPointMake(tilePos.x + offset.x, tilePos.y + offset.y); tilePos = [self ensureTilePosIsWithinBounds:tilePos]; if ([self isTilePosBlocked:tilePos tileMap:tileMap] == NO) { [self centerTileMapOnTileCoord:tilePos tileMap:tileMap]; } } } }

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