October 2009 - MacRuby-devel - lists.macosforge.org

tentative first steps with GCD in macruby
by John Shea 22 Oct '09

22 Oct '09

Dear All, (sorry for the long post) I have been experimenting a bit with GCD in MacRuby 0.5 beta. I have managed to get some code working as I would expect it to work, and I am wondering if a few of you could provide a sanity check that everything i am doing is above board and not the result of unspecified behaviour. My main concern is that when running a set of tasks and collecting the results that the collecting itself is not thread safe (in this case the << operator). And if it is not thread safe - then what is the best way to collect results from dispatched tasks. But so far it seems to work magically well. Before I put the code down - here are some initial discoveries (which may have been obvious to everyone else). 1. When running tests you need wait until the threads are finished - otherwise the main loop will finish before the output comes back from other threads. I did that with a sleep, but also experimented with looping until an array is filled. 2. Scope: Given one of the global system queues : gcdq = Dispatch::Queue.concurrent(:default) and looping over a number of dispatches: 5.times do |index| gcdq.dispatch {puts index} end the task dispatched will hold the last value of index - it will not capture the changing value of index - I assume that the task has a pointer directly to the index variable. (an article by Bill Bumgarner http://www.friday.com/bbum/2009/08/29/blocks-tips-tricks/ pointed out something similar in objC - but had a different way of solving this) So to capture that changing index, I created a Proc then turned it back to a block, eg: 5.times do |index| task = Proc.new {puts index} gcdq.dispatch &task end 3. You will notice that in the code below in check = a.run-disp2 that the array is returned - I assume empty - and is gradually filled by the tasks. class A def run_disp(an_array) gcdq = Dispatch::Queue.concurrent(:default) ["f","g","h","i", "j"].each_with_index do |val, index| task = Proc.new {an_array << do_something(val, index)} gcdq.dispatch &task puts "Loaded #{index}" end end def run_disp2 an_array = [] gcdq = Dispatch::Queue.concurrent(:default) ["f","g","h","i", "j"].each_with_index do |val, index| task = Proc.new {an_array << do_something(val, index)} gcdq.dispatch &task puts "Loaded #{index}" end an_array end def do_something(val, index) #staggered sleeps so as to prove that various tasks finish first result = val * (index + 1) case index when 0, 1 sleep 2 when 2 sleep 1 else sleep 0 end puts "yeah baby! #{index}" result end end a = A.new #pass array to be filled an_array = [] a.run_disp(an_array) sleep 10 puts "passed array: #{an_array.join(", ")}" check = a.run_disp2 sleep 10 puts "returned array: #{check.join(", ")}" #results: # Loaded 0 # Loaded 1 # Loaded 2 # Loaded 3 # Loaded 4 # yeah baby! 4yeah baby! 3 # # yeah baby! 2 # yeah baby! 1 # yeah baby! 0 # passed array: iiii, jjjjj, hhh, gg, f # Loaded 0 # Loaded 1 # Loaded 2 # Loaded 3 # Loaded 4 # yeah baby! 3 # yeah baby! 4 # yeah baby! 2 # yeah baby! 0 # yeah baby! 1 # returned array: iiii, jjjjj, hhh, f, gg #assume puts is not transactional. thanks in advance for any comments / corrections, John

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macgem with mixed-in ObjC
by B. Ohr 21 Oct '09

21 Oct '09

Hi, what do you think about a macgem with mixed-in ObjC? This could be useful for supporting native C libraries without using the MRI C interface, for calling parts of the OS X framework that is not Obj-C, for speed optimized code and so on..... A macgem could also be delivered with a precompiled .rbo, so it can easily be installed on machines without the Developer tools installed. (I haven't yet tried to run macruby on such a machine ;-) ) BTW, I failed in building an .rbo bundle with a mixed-in ObjC part. Pure Ruby like this macrubyc --arch x86_64 -C "foo.rb" -o "output/foo.rbo" is working, but I didn't find a way to include another .o file generated by gcc. Bernd

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MacRuby 0.5 beta 1
by Laurent Sansonetti 20 Oct '09

20 Oct '09

Hi, The first beta release of MacRuby 0.5 is out! I prepared some notes here: http://www.macruby.org/blog/2009/10/07/macruby05b1.html The goal is to go through a few beta releases before releasing the final 0.5. Please give it a try and report us bugs & feedback :) Laurent

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[MacRuby] #393: Custom accessors for KVO
by MacRuby 20 Oct '09

20 Oct '09

#393: Custom accessors for KVO ----------------------------------+----------------------------------------- Reporter: paolo.bosetti@… | Owner: lsansonetti@… Type: defect | Status: new Priority: minor | Milestone: MacRuby 0.5 Component: MacRuby | Keywords: KVO ----------------------------------+----------------------------------------- if one creates custom accessors fro object keys to be used for KVO, the setter cannot be made KVO-compliant. The runtime error message is something like: KVO autonotifying only supports -set<Key>: methods that return void. Autonotifying will not be done for invocations of -[MyController setSlider:]. Even making the setter returning nil doesn't work. See the attached example. -- Ticket URL: <http://www.macruby.org/trac/ticket/393> MacRuby <http://macruby.org/>

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rake spec:ci
by Conrad Taylor 19 Oct '09

19 Oct '09

Hi, the 'macrake spec:ci' is failing using r2848. BEGIN OUTPUT: $ macrake spec:ci (in /Users/conradwt/macruby.dir/projects/macruby-trunk) unknown: warning: already initialized constant MACRUBY_VERSION ./mspec/bin/mspec ci -B ./spec/macruby.mspec :full MacRuby version 0.5 (ruby 1.9.0) [universal-darwin10.0, x86_64] ......2009-10-18 04:25:27.098 macruby[16464:1b07] *** Terminating app due to uncaught exception 'TypeError', reason: '42 is not a symbol' *** Call stack at first throw: ( 0 CoreFoundation 0x00007fff82a995a4 __exceptionPreprocess + 180 1 libobjc.A.dylib 0x00007fff86ae3313 objc_exception_throw + 45 2 libmacruby.dylib 0x0000000100179285 rb_vm_raise + 437 3 libmacruby.dylib 0x000000010003ff69 rb_exc_raise + 9 4 libmacruby.dylib 0x000000010003e286 rb_raise + 310 5 libmacruby.dylib 0x00000001000eddc0 rb_str_dump + 0 6 libmacruby.dylib 0x000000010011c6fe rb_queue_get_concurrent + 46 7 libmacruby.dylib 0x00000001001667cd rb_vm_dispatch + 6269 8 ??? 0x000000010117ff98 0x0 + 4313317272 9 libmacruby.dylib 0x00000001001667cd rb_vm_dispatch + 6269 10 ??? 0x0000000101171e55 0x0 + 4313259605 11 ??? 0x000000010116d2b5 0x0 + 4313240245 ) terminate called after throwing an instance of 'NSException' rake aborted! Command failed with status (): [./mspec/bin/mspec ci -B ./spec/macruby.msp...] END OUTPUT:

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[MacRuby] #392: String subclass obj.dup loses its class
by MacRuby 19 Oct '09

19 Oct '09

#392: String subclass obj.dup loses its class ------------------------------+--------------------------------------------- Reporter: timshadel@… | Owner: lsansonetti@… Type: defect | Status: new Priority: major | Milestone: MacRuby 0.5 Component: MacRuby | Keywords: dup string ------------------------------+--------------------------------------------- From normal IRB >> class StringChild < String; end => nil >> c = StringChild.new => "" >> c.class => StringChild >> d = c.dup => "" >> d.class => StringChild from macirb (0.5b1) >> class StringChild < String; end => nil >> c = StringChild.new => "" >> c.class => StringChild >> d = c.dup => "" >> d.class => NSMutableString I found this through trying to use the BlueCloth gem (renders Markdown to HTML). -- Ticket URL: <http://www.macruby.org/trac/ticket/392> MacRuby <http://macruby.org/>

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Using Bacon with MacRuby
by Ernest N. Prabhakar, Ph.D. 19 Oct '09

19 Oct '09

Hi all, I'm trying to use Bacon with MacRuby, and am running into an odd error: A new array - should be empty - should have zero size - should raise on trying fetch any index - should have an object identity - should be a palindrome - should have super powers [FAILED] core:in `write:': not opened for writing (IOError) Running it with "bacon" on the command-line avoids the problem, and 'fails' correctly. :-) Here's my config -- any suggestions? Is this a real bug, or user error? -- Ernie P. > $ macruby --version > MacRuby version 0.5 (ruby 1.9.0) [universal-darwin10.0, x86_64] > $ sudo macgem install bacon > $ macgem list > > *** LOCAL GEMS *** > > bacon (1.1.0) I am using the whirlwind tutorial for Bacon 1.1: http://www.ruby-forum.com/topic/172139 > #!/usr/local/bin/macruby > > require 'rubygems' > require 'bacon' ...

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TDD in Objective-C with MacRuby
by Joshua Ballanco 18 Oct '09

18 Oct '09

Hey all! So, I've finished up the TDD recipe. You can find a PDF of it at http://files.me.com/jballanc/1lxnwb . Please look it over and let me know what you think! I welcome all comments/criticisms/suggestions. Cheers, Josh

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How to properly wrap a C/C++ library for MacRuby (esp.: new/alloc/initialize)
by Julian Raschke 18 Oct '09

18 Oct '09

Background: I want to let some existing Ruby projects run on MacRuby which depend on several C extensions. Since I have done some Objective C(++) before, I thought I would just follow the macruby.org guide on how to write an Objective C bundle for use with MacRuby. (Seemed conceptually easier to me than using FFI.) My problem is that I don't know how to best conceal the fact that the wrapped objects are now NSObjects, not typical C extension objects. I can monkey-patch the method signature style, but I feel that it isn't so trivial for constructors. The reasons for that probably reach deeper into MR/Cocoa than I have looked so far. The existing Ruby code expects to be able to do: MyCObject.new(2, 4) however my wrapped-through-Objective-C library only offers: MyCObject.alloc.initWithA 2, b: 4 I have tried to just override MyCObject.new to call alloc.initWithA:b:, but that breaks as soon as the user wants to override "initialize". He may even want to call "super" at a defined point in there. I have also tried writing a "initialize" method that calls "initWithA:b:", and calling "alloc.initialize(a, b)" from within MyCObject.new. I expected that this may allow for overriding #initialize. Instead, it leads to a segfault. Is there a way to completely hide the fact that MyCObject is actually not a plain old Ruby class? Julian

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[MacRuby] #353: No such file to load bigdecimal
by MacRuby 18 Oct '09

18 Oct '09

#353: No such file to load bigdecimal ----------------------------------+----------------------------------------- Reporter: noelrappin@… | Owner: lsansonetti@… Type: defect | Status: new Priority: blocker | Milestone: Component: MacRuby | Keywords: ----------------------------------+----------------------------------------- A previously working MacRuby script now triggers this error on load in the nightlies -- persists as of the 9/27 nightly, I'm not sure what nightly introduced it. no such file to load -- bigdecimal (LoadError) from /Library/Frameworks/MacRuby.framework/Versions/0.5/usr/lib/ruby/1.9.0/rubygems/custom_require.rb:33:in `require:' -- Ticket URL: <http://www.macruby.org/trac/ticket/353> MacRuby <http://macruby.org/>

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