Re: Accessing array in thread safe way
Re: Accessing array in thread safe way
- Subject: Re: Accessing array in thread safe way
- From: Marco Tabini <email@hidden>
- Date: Tue, 06 Mar 2012 17:10:01 -0500
On 2012-03-06, at 2:51 PM, Jan E. Schotsman wrote:
> Hello,
>
> I have an array of progress values (number objects) for subprojects, from which I calculate the overall progress .
> The array is an atomic property of the project class.
>
> Is it safe to access this array from multiple threads, using methods like objectAtIndex and replaceObjectAtIndex?
>
NSMutableArray is not (as far as I know) thread-safe while being mutated[1]. That said, it doesn't mean that you can't use the array in a multi-threaded environment: Just make sure that writes are all synchronized, and that enumerations only happen on immutable copies.
HTH,
—Mt.
[1]: https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/Multithreading/ThreadSafetySummary/ThreadSafetySummary.html
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