Re: Perl/Tk and threads on Win32

in reply to Perl/Tk and threads on Win32

I have limited experience with Win32, but with the limited tests that I've done, they work as well as on linux. I did run into a glitch with the way the various win32 versions handle shared variables. For instance, ME and earlier can't handle deep hashes, but XP handled it fine. So I would be cautious about thinking that anything that runs on XP will work with earlier releases.

my @chs = (1..99);                             
                                               
# setting this to 2 works on windowsME         
# but will bog down over 3, and crash          
# at values like 60                            
my $max_prog_chan = 60;                        
                                               
my %days;                                      
 foreach my $channel(@chs){                    
   foreach my $count(0..$max_prog_chan){       
#print "$channel $count\n";                    
                                               
share $days{$channel}{$count}{'channel'};      
share $days{$channel}{$count}{'channel_info'}; 
share $days{$channel}{$count}{'episode_num'};  
share $days{$channel}{$count}{'start'};        
share $days{$channel}{$count}{'stop'};         
share $days{$channel}{$count}{'makedate'};     
share $days{$channel}{$count}{'description'};  
share $days{$channel}{$count}{'title'};        
share $days{$channel}{$count}{'writer'};       
share $days{$channel}{$count}{'director'};     
share $days{$channel}{$count}{'actors'};       
share $days{$channel}{$count}{'rating'};       
share $days{$channel}{$count}{'length'};       
share $days{$channel}{$count}{'category'};     
share $days{$channel}{$count}{'star_rating'};  
 }                                             
}
[download]

I'm not really a human, but I play one on earth. Cogito ergo sum a bum

Comment on Re: Perl/Tk and threads on Win32 Download Code

Replies are listed 'Best First'.
Re^2: Perl/Tk and threads on Win32 by Anonymous Monk on Oct 28, 2006 at 21:24 UTC
The points made above are good. In addition I believe tk has issues with threads because it maintains its own state seperate to that of perl, so if you have tk objects accessed by multiple perl threads it will fall to pieces. To avoid these problems, spawn multiple threads early on, and create/interface with tk from your main thread/one thread only. Pass information or actions from your gui/tk thread to your worker threads via shared variables / thread safe queues or IPC etc. One possible advantage to this is that you have a better chance of ensuring your gui doesnt freeze during blocking actions as they will be passed to your worker threads. On the downside... your apps memory usage may well be huge by adding a gui - thats been my experience. Good luck, Rossco	[reply]

Replies are listed 'Best First'.

Re^2: Perl/Tk and threads on Win32
by Anonymous Monk on Oct 28, 2006 at 21:24 UTC

The points made above are good. In addition I believe tk has issues with threads because it maintains its own state seperate to that of perl, so if you have tk objects accessed by multiple perl threads it will fall to pieces. To avoid these problems, spawn multiple threads early on, and create/interface with tk from your main thread/one thread only. Pass information or actions from your gui/tk thread to your worker threads via shared variables / thread safe queues or IPC etc. One possible advantage to this is that you have a better chance of ensuring your gui doesnt freeze during blocking actions as they will be passed to your worker threads. On the downside... your apps memory usage may well be huge by adding a gui - thats been my experience. Good luck, Rossco

[reply]

In Section Seekers of Perl Wisdom