User talk:Dmitry-kazakov: Difference between revisions
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== exception propagation in Ada. == |
== exception propagation in Ada. == |
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In [[Rendezvous#The_task]] what do these lines do: |
In [[Rendezvous#The_task|Ada's Rendezvous]] what do these lines do: |
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exception |
exception |
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when Out_Of_Ink => |
when Out_Of_Ink => |
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null; |
null; |
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end; |
end; |
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They look like they are masking/ignoring the Out_Of_Ink exception. |
They look like they are masking/ignoring the ''Out_Of_Ink'' exception. |
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Whereas program appears to propagate Out_Of_Ink back to Mother_Goose. e.g. |
Whereas program appears to propagate ''Out_Of_Ink'' back to ''Mother_Goose''. e.g. |
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requeue Backup.Print with abort; |
requeue Backup.Print with abort; |
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Is that because |
Is that because of the ''with abort''? |
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Also: when the task is requeued, |
Also: when the task is requeued, does the ''Main'' printer suspend |
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waiting for Backup to finish? |
waiting for ''Backup'' to finish? (Or is the exception propagated directly |
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back to ''Mother_Goose'' without passing through ''Backup'') |
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ThanX |
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Revision as of 06:33, 19 February 2009
Language Table
I was thinking about adding a "parameter passing methods available" column to the big language table. If I do, it should probably have an informational article to go with it. Do you think you're up for it? --Mwn3d 03:30, 23 July 2008 (UTC)
- I'll try. --Dmitry-kazakov 07:18, 23 July 2008 (UTC)
binary mode
About the problem you talk about on the ppm output article, I am used to see that it is possible to open a file in binary mode on your OS.
Isn't it possible with this programming language ? Blue Prawn 11:28, 7 December 2008 (UTC)
- It is OS-specific too. In earlier times, when OS was an OS (:-)), there was RSX-11, for example. It didn't have text files in MS-DOS or UNIX sense. There were record files instead. Each line was stored into a record. The advantage was that a line could contain any characters and LF, CR or NUL had no special meaning.
- I will rewrite Ada solution in order to make it more portable, but I am afraid the problem with it and other solutions as well will persist. Because if we used binary in the sense stream of characters, then we would have to specify a few more things to make it portable:
- character is? (octet of bits)
- line terminator in the file header is? (ASCII LF for example)
- EOF is? (ASCII LF, NUL, nothing)
- And well, PPM isn't our fault... (:-)) --Dmitry-kazakov 12:17, 7 December 2008 (UTC)
exception propagation in Ada.
In Ada's Rendezvous what do these lines do:
exception when Out_Of_Ink => null; end;
They look like they are masking/ignoring the Out_Of_Ink exception.
Whereas program appears to propagate Out_Of_Ink back to Mother_Goose. e.g.
requeue Backup.Print with abort;
Is that because of the with abort?
Also: when the task is requeued, does the Main printer suspend waiting for Backup to finish? (Or is the exception propagated directly back to Mother_Goose without passing through Backup)
ThanX
NevilleDNZ 06:33, 19 February 2009 (UTC)