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And there you have it: relatively painless concurrency. Granted, this contrived example isn t much compared to a large application, but these concepts can scale up to handle more complex situations as well. What we ve shown you works well in today s Leopard and iPhone applications, but Apple didn t stop there. Starting with Snow Leopard, most of the design of NSOperation and NSOperationQueue has been reimplemented at a lower level in the OS, resulting in a nice piece of technology called Grand Central Dispatch.

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By default, the SELECT command does not lock any records during its operation The FOR clause allows you to change that behavior It is not uncommon during a transaction (discussed later in this chapter) to perform a SELECT command to obtain the current data values, then immediately perform an INSERT, DELETE, or UPDATE command to alter the values in the database Between those operations, you may not want the current values to be changed by other database users This is where the FOR clause comes in The FOR UPDATE clause causes the records returned in the result set to be locked in the table This prevents other users from viewing, deleting, or modifying any record returned in the result set until the transaction that contains the SELECT command finishes Using the FOR UPDATE clause causes the SELECT command to wait until any other table locks set by other users are completed If you specify the NOWAIT parameter, the SELECT command does not wait, but instead exits with an error stating that the records are locked The FOR SHARE clause behaves similarly to the FOR UPDATE clause, except it allows other users to view the records while they are locked However, they will not be able to delete or modify any of the records By default, the FOR clause locks all records that are returned in the result set If you do not want to lock all of the records returned in the result set, you combine the FOR clause with the LIMIT clause to limit the number of records locked in the transaction

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This idea of putting units of work into queues that can be executed in the background, with the system managing the threads for you, is really powerful, and greatly simplifies many development situations where concurrency is needed It seems that once this technology was up and running in the form of NSOperationQueue in Leopard, Apple decided to make a more general solution, that could work not only from Objective-C, but also C and C++ Starting with Snow Leopard, this solution, called Grand Central Dispatch (which we ll call GCD from now on) is ready for use GCD puts most of the core concepts of NSOperationQueue units of work, painless background processing, automatic thread management into a C interface that can be used from all of the Cbased languages This means that it s not just for Cocoa programmers.

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Now even lowlevel command-line utilities written in C can take advantage of these features NSOperationQueue itself was rewritten for Snow Leopard using GCD, and to top things off, Apple has made its implementation of GCD open-source, so that it could be ported to other Unix-like OSes as well The main difference between the design of NSOperationQueue and the queues in GCD is that while NSOperationQueue can deal with arbitrarily complex dependency relationships between its NSOperations to determine in what order they should be executed, the GCD queues are strictly FIFO (first-in, first-out) Units of work added to a GCD queue will always be started in the order they were placed in the queue That being said, they may not always finish in the same order, because a GCD queue will automatically distribute its work among multiple threads.

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