Re: [GM-help] [Q] calling OpenMP functions in a thread function for NSThread?
Re: [GM-help] [Q] calling OpenMP functions in a thread function for NSThread?
- Subject: Re: [GM-help] [Q] calling OpenMP functions in a thread function for NSThread?
- From: JongAm Park <email@hidden>
- Date: Fri, 29 Jul 2011 14:57:12 -0700
On Jul 29, 2011, at 2:03 PM, Bob Friesenhahn wrote:
> On Fri, 29 Jul 2011, JongAm Park wrote:
>>
>> is there a problem in calling OpenMP functions in a thread function?
>
> Possibly there is, however, I recall that your main program uses Objective C. Perhaps the Objective C runtime does not properly initialize with OpenMP?
>
> OpenMP does not provide any way to explicitly initialize it.
>
> Bob
Thanks for your reply.
Right,there is no function like "InitializeOpenMP()", which should be called at the beginning.
I set the project to use OpenMP, and if it is just declared statically like :
Magick::Image myImage;
in a normal method, there is no problem.
Only when they are either created or accessed in a thread function, it causes the problem.
Apple's GCC has support for OpenMP and it can be turned on/off from a project setting, and I turned it on.
The last time I worked with OpenMP was about 3~5 years ago, and at that moment, there was no problem.
Let me do some more experiment.
Maybe current version of GCC/LLVM is broken.
( I tested with GCC, LLVM-GCC, LLVM already. )
Thanks again,
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