[MacRuby-devel] Frameworks Help

Fri Oct 29 23:46:47 PDT 2010

Hello Shaun,

On Sat, Oct 30, 2010 at 1:41 AM, Shaun August <shaun at eoslightmedia.com>wrote:

> Hi All,
>
> I have had some limited success going back and forth between the c
> framework, objective-c wrapper and MacRuby.
>
> I am getting numerous malloc errors when I start up the application. The
> application sort of runs after the first malloc error but after the second
> error it crashes almost immediately.
>
>
> *2010-10-29 21:31:06.323 YYY[3585:a0f] awaking the Phidgets*
> *YYY(3585,0x10374d000) malloc: *** auto malloc[3585]: error: GC operation
> on unregistered thread. Thread registered implicitly. Break on
> auto_zone_thread_registration_error() to debug.*
> **
> *2010-10-29 21:31:06.469 YYY[3585:5003] phidget Added*
> *2010-10-29 21:31:06.563 YYY[3585:a0f] Phidget Added!*
> *2010-10-29 21:31:06.563 YYY[3585:a0f] input changed*
> *2010-10-29 21:31:06.564 YYY[3585:a0f] input changed*
> *2010-10-29 21:31:06.564 YYY[3585:a0f] input changed*
> *2010-10-29 21:31:06.565 YYY[3585:a0f] input changed*
> *2010-10-29 21:31:06.567 YYY[3585:a0f] input changed*
> *2010-10-29 21:31:06.568 YYY[3585:a0f] input changed*
> *2010-10-29 21:31:06.568 YYY[3585:a0f] input changed*
> *2010-10-29 21:31:06.568 YYY[3585:a0f] input changed*
> *YYY(3585,0x115944000) malloc: *** auto malloc[3585]: error: GC operation
> on unregistered thread. Thread registered implicitly. Break on
> auto_zone_thread_registration_error() to debug.*
> **
> *2010-10-29 21:31:16.595 YYY[3585:a0f] -[NSRegion InputChange:]:
> unrecognized selector sent to instance 0x200609f60*
> *2010-10-29 21:31:16.596 YYY[3585:a0f] -[NSRegion InputChange:]:
> unrecognized selector sent to instance 0x200609f60*
> *2010-10-29 21:31:16.914 YYY[3585:a0f] -[NSRegion InputChange:]:
> unrecognized selector sent to instance 0x200609f60*
> *2010-10-29 21:31:16.915 YYY[3585:a0f] -[NSRegion InputChange:]:
> unrecognized selector sent to instance 0x200609f60*
>
>
> I have read the malloc errors come from problems with the threading in the
> c libraries but I am not sure if there is anything I can do to fix this. Am
> I stuck with this error or is there a way around it?
>

This is definitely happening cause of attempting to access a shared memory
pointer, between two or more threads.  What you need is a Mutex.  Which in
the Objective-C / Cocoa world, is NSLock.  What NSLock does, is basically
dis-allows access to a Variable Pointer, for reading and writing in other
threads, while the Lock is in place.  It's not a catch all, save all for
libraries that haven't been built thread aware, as some may still cause
errors.  But if you use NSLock in your wrapper, in areas where you need to
gather data from the C library for use in Objective-C / MacRuby, it should
greatly reduce the malloc() crashes.

hth,

Mario

> Thanks,
>
> Shaun
>
>
>
>
> On 2010-10-24, at 12:17 AM, Mario Steele wrote:
>
> Hey Shaun,
>
> On Sun, Oct 24, 2010 at 1:14 AM, Shaun August <shaun at eoslightmedia.com>wrote:
>
>> Hi Again,
>>
>> I have spent some time with Nick's tutorial and I am looking into wrapping
>> the framework I have been provided with and I have a few more questions.
>>
>> The framework I am working with is already compiled and not in an xcode
>> file. I am guessing all I need to do is write the Objective-C wrapper?
>>
>
> Yeah, all you have to worry about, is writing the wrapper, as it is what I
> did with my code writing for my wrapper.
>
>
>> The other issue I am having is the framework only contains one header file
>> which links out to a series of files contained in a system extension.
>>
>
> The header file, is all you need to import, as it should define all public
> API Access you need, including structs, to interface with the binary
> library.
>
>
>> Am I able to write my wrapper in an Objective-C class from within my
>> macruby application or do I need to create a bundle and import that into my
>> project.
>>
>
> You will need to write Pure Objective-C code for the API Access, but the
> code can be included with your macruby application, in the project itself.
>  What will happen, is when you compile the main Objective C File, Main.m,
> it'll compile all the other Objective C files into the binary executable,
> that will eventually run your rb_main.rb file.  It'll give all the access of
> your Objective C libraries that you wrote, right within your application.
>
> hth,
>
> Mario
>
>
>> Thanks,
>>
>> Shaun
>>
>>
>>
>>
>> On 2010-10-19, at 10:12 PM, Mario Steele wrote:
>>
>> Hello Shaun,
>>
>> On Wed, Oct 20, 2010 at 12:00 AM, Shaun August <shaun at eoslightmedia.com>wrote:
>>
>>> Hi Robert,
>>>
>>> Thanks! That make sense. All those cocoa classes have capitals and they
>>> work fine. I seem to be able to call from the framework but I am running
>>> into an undefined method 'extern'. I have also read somewhere that extern
>>> doesn't work with MacRuby. Is that correct? The framework I am dealing with
>>> is calling C functions and I am having trouble accessing them.
>>>
>>
>> extern is a macro for the ld library, to export an API Address in the
>> Dynamic library, that can be access dynamically at run time.  With
>> Objective-C, or more so specifically with MacRuby, you need to write a sort
>> of thin wrapper around C Functions in Objective C, in order to access said
>> Functions.  So if the framework that you are working with, doesn't expose
>> Objective C API Functions, you'll need to write a thin wrapper in order to
>> access them.  See the tutorial done by Nick Ludlam about wrapping the TagLib
>> C Library, in Objective C.  You can find it here:
>> http://www.macruby.org/documentation/reading-an-mp3-with-macruby.html  It's
>> best to read through the entire article, as it gives you information about
>> wrapping C Functions in Objective C, which is quite useful, when writing
>> your own wrapper.
>>
>> hth,
>>
>> Mario
>>
>>
>>> Thanks,
>>>
>>> Shaun
>>>
>>>
>>> On 2010-10-19, at 8:26 PM, Robert Rice wrote:
>>>
>>> > Hi Shaun:
>>> >
>>> > Lower case method names is only a convention. MacRuby will work fine
>>> using upper case, i.e., constant, method names.
>>> > I know because I only recently changed my project to conform to the
>>> convention.
>>> >
>>> > Bob Rice
>>> >
>>> >
>>> > On Oct 19, 2010, at 7:17 PM, Shaun August wrote:
>>> >
>>> >> Hi There,
>>> >>
>>> >> I am attempting to work with a framework provided by a USB device
>>> manufacturer and all of their method names start with capitols and I am
>>> wondering about the easiest way to access these methods through macruby. I
>>> remember reading somewhere about fixing the constants in Obj-C but I cannot
>>> locate the information.
>>> >>
>>> >> Does anyone have any suggestions as to how to remedy this? Should I
>>> rename every command in the framework?
>>> >>
>>> >> Thanks,
>>> >>
>>> >> Shaun
>>> >>
>>> >> _______________________________________________
>>> >> MacRuby-devel mailing list
>>> >> MacRuby-devel at lists.macosforge.org
>>> >> http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel
>>> >>
>>> >
>>> > _______________________________________________
>>> > MacRuby-devel mailing list
>>> > MacRuby-devel at lists.macosforge.org
>>> > http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel
>>>
>>> _______________________________________________
>>> MacRuby-devel mailing list
>>> MacRuby-devel at lists.macosforge.org
>>> http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel
>>>
>>
>>
>>
>> --
>> Mario Steele
>> Lieutenant Commander 3
>> XO - Geo 99
>> XO - STO IFT Fleet
>> http://www.trekfederation.com
>> http://geo99.ruby-im.net
>>
>> _______________________________________________
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>> http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel
>>
>>
>>
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>> http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel
>>
>>
>
>
> --
> Mario Steele
> Lieutenant Commander 3
> XO - Geo 99
> XO - STO IFT Fleet
> http://www.trekfederation.com
> http://geo99.ruby-im.net
>
> _______________________________________________
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> http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel
>
>
>
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>
>

-- 
Mario Steele
Lieutenant Commander 3
XO - Geo 99
XO - STO IFT Fleet
http://www.trekfederation.com
http://geo99.ruby-im.net
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