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Re: Is NSDateFormatter thread-safe?
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Re: Is NSDateFormatter thread-safe?


  • Subject: Re: Is NSDateFormatter thread-safe?
  • From: Roland King <email@hidden>
  • Date: Tue, 01 Nov 2011 08:40:16 +0800

It's not. Documented in the Thread Programming Guide.



On 1 Nov, 2011, at 8:27, Jens Alfke <email@hidden> wrote:

> I have some code that uses a shared NSDateFormatter instance to convert dates to/from ISO-8601 format. This code is now being invoked on multiple threads, and I’m getting intermittent malloc warnings about double frees, and one actual crash.
> My assumption was that an NSDateFormatter should be thread-safe as long as I treat it as read-only (not changing any attributes) but this makes me think I’m wrong. Anyone know for sure?
>
> Here’s the usual backtrace I see in a malloc warning or crash:
>
> #0  0x018f83b4 in icu::OlsonTimeZone::operator= ()
> #1  0x018f9f2d in icu::OlsonTimeZone::clone ()
> #2  0x018bb400 in icu::DateFormat::parse ()
> #3  0x01964d05 in udat_parse ()
> #4  0x01623161 in CFDateFormatterGetAbsoluteTimeFromString ()
> #5  0x01622f8e in CFDateFormatterCreateDateFromString ()
> #6  0x006bf7e9 in getObjectValue ()
> #7  0x006bf701 in -[NSDateFormatter getObjectValue:forString:errorDescription:] ()
> #8  0x006bfa3f in -[NSDateFormatter dateFromString:] ()
> …
>
> —Jens
>
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References: 
 >Is NSDateFormatter thread-safe? (From: Jens Alfke <email@hidden>)

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