Function execution timeout in objective c

Question

I have a function call as below

NSData *data = [self createDummyData];

I want function the createDummyData to break and return nil if it takes execution time of more than 1 second. How can i achieve it?

Why do you want that? You're blocking the main thread for that 1 second? — Wain, Mar 31 '14 at 14:07
This call happens on the background thread in my application. — Diptesh, Mar 31 '14 at 14:08
This is the best logic http://stackoverflow.com/questions/2129794/how-to-log-a-methods-execution-time-exactly-in-milliseconds — iPatel, Mar 31 '14 at 14:15
if `createDummyData` has iteration nature just check time each iteration — sage444, Mar 31 '14 at 14:19

score 3 · Accepted Answer · answered Mar 31 '14 at 14:50

3

Create an NSOperationQueue.
Create a Timer.
Add an operation to the queue that does what you want it to do.
Start the timer with a fire date of 1 second in the future
When the timer fires, cancel the operations in the queue.

If the operation has finished, cancelling will have no effect. If it hasn't finished, and you've correctly configured the operation, then the operation will stop.

answered Mar 31 '14 at 14:50

Abizern

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If the operation is currently executing the operation is not cancelled. How do we cancel it ? – Diptesh Apr 01 '14 at 12:50
You need to put hooks into your NSOperation subclass to check for the `isCancelled` event and deal with it that way. – Abizern Apr 01 '14 at 13:00

Function execution timeout in objective c

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