Re: [fpc-devel] properties with getter evaluation in gdb
Paul Ishenin het geskryf: 12.03.2010 23:51, Paul Ishenin wrote: If something more is required please let me know and I will search. Also found the next document with more info: http://www.agner.org/optimize/calling_conventions.pdf And here is more information. http://docwiki.embarcadero.com/RADStudio/en/Program_Control Regards, - Graeme - -- fpGUI Toolkit - a cross-platform GUI toolkit using Free Pascal http://opensoft.homeip.net/fpgui/ ___ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-devel
Re: [fpc-devel] Unable to open file on Linux randomly in a CGI application when using templates
On 15 Mar 2010, at 03:17, ABorka wrote: On 3/14/2010 16:08, Jonas Maebe wrote: On 14 Mar 2010, at 23:39, ABorka wrote: I have a CGI application with a datamodule that is using templates to generate the response pages (accessing a MySQL database through ZEOS). Every once in a while, I'm getting an Unable to open file exception that points to one of the templates the website is using. What could be the problem? Maybe you run out of file handles? If that is the case, shouldn't something be in the syslog or some other log? No. It's a generic user error like any other. Is there any way I can check this for sure like last system error string or something? You can call sysutils.GetLastOSError and look up the number in errno.inc The exception message only says that Unable to open file filepath_filename. I checked the /proc/sys/fs/file-max and it shows 294692 The per-user open file handles limit is different. You can see it in the output of ulimit -a under bash (if it says unlimited, it means that it uses the system limit). Maybe you leak file handles somewhere. You can look in /proc/pid/fd from time to time to see whether the number of open files keeps growing over time. Jonas ___ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-devel
Re: [fpc-devel] properties with getter evaluation in gdb
On 15 Mar 2010, at 04:01, Paul Ishenin wrote: 12.03.2010 21:49, Jonas Maebe wrote: The default calling convention could be used. This would only work for routines with simple return types though (types that are not returned via a hidden first parameter). I don't think any/default calling convention have result return in EAX as fpc do. All calling conventions on i386 (except for safecall) return simple results in eax. Also for methods self needs to be passed. That's true, but GDB already does that when calling a method, including for Pascal (the only problem in that respect is that without the hacky patch mentioned earlier, GDB's Pascal parser does not support expressing method calls). Jonas ___ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-devel
Re: [fpc-devel] properties with getter evaluation in gdb
On 15 Mar 2010, at 07:49, Graeme Geldenhuys wrote: And here is more information. http://docwiki.embarcadero.com/RADStudio/en/Program_Control Thank you, that is the information that was needed: For a string, dynamic array, method pointer, or variant result, the effects are the same as if the function result were declared as an additional var parameter following the declared parameters. In other words, the caller passes an additional 32-bit pointer that points to a variable in which to return the function result. This explains http://bugs.freepascal.org/view.php?id=15691 Jonas ___ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-devel
Re: [fpc-devel] properties with getter evaluation in gdb
15.03.2010 17:01, Jonas Maebe wrote: the only problem in that respect is that without the hacky patch mentioned earlier, GDB's Pascal parser does not support expressing method calls. The remaining question for me is whether you will implement that hacky patch :) ? Best regards, Paul Ishenin. ___ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-devel
Re: [fpc-devel] properties with getter evaluation in gdb
On 15 Mar 2010, at 11:12, Paul Ishenin wrote: 15.03.2010 17:01, Jonas Maebe wrote: the only problem in that respect is that without the hacky patch mentioned earlier, GDB's Pascal parser does not support expressing method calls. The remaining question for me is whether you will implement that hacky patch :) ? It has to be fixed first so it is no longer hacky. I don't know when I will have time for that. Jonas ___ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-devel
Re: [fpc-devel] properties with getter evaluation in gdb
On Mon, Mar 15, 2010 at 7:31 AM, Jonas Maebe jonas.ma...@elis.ugent.be wrote: On 15 Mar 2010, at 11:12, Paul Ishenin wrote: 15.03.2010 17:01, Jonas Maebe wrote: the only problem in that respect is that without the hacky patch mentioned earlier, GDB's Pascal parser does not support expressing method calls. The remaining question for me is whether you will implement that hacky patch :) ? It has to be fixed first so it is no longer hacky. I don't know when I will have time for that. Jonas Is it available somewhere? Best regards, Flávio ___ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-devel
Re: [fpc-devel] properties with getter evaluation in gdb
On 15 Mar 2010, at 14:13, Flávio Etrusco wrote: On Mon, Mar 15, 2010 at 7:31 AM, Jonas Maebe jonas.ma...@elis.ugent.be wrote: On 15 Mar 2010, at 11:12, Paul Ishenin wrote: 15.03.2010 17:01, Jonas Maebe wrote: the only problem in that respect is that without the hacky patch mentioned earlier, GDB's Pascal parser does not support expressing method calls. The remaining question for me is whether you will implement that hacky patch :) ? It has to be fixed first so it is no longer hacky. I don't know when I will have time for that. Is it available somewhere? I've attached pascalmethodcall.patch. It's against gdb cvs head from June last year, so it may no longer cleanly apply (but it's pretty small, so I don't expect many problems). However, unless you declare your methods as cdecl, you're not going to be able to call them successfully. Jonas pascalmethodcall.patch Description: Binary data ___ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-devel
Re: [fpc-devel] Unable to open file on Linux randomly in a CGI application when using templates
Thanks for the help.
It appears that the GetLastOSError is 9 for these errors.
In the errno.inc for Linux, that is
ESysEBADF = 9;{ Bad file number }
I'm not exactly sure what this means though.
Right now as a workaround, when this happens, I do a sleep(100) and
retry the page generation and it seems to work.
This only happens when multiple simultaneous requests arrive to the
apache server (ex: a dozen iframes hitting cgi calls from a 3rd party
website, requesting the same template to be used to generate a response
web page with different parameters).
I would like to eliminate this problem in a more elegant way (fix) if it
is possible.
AB
On 3/15/2010 02:58, Jonas Maebe wrote:
I have a CGI application with a datamodule that is using templates
to generate the response pages (accessing a MySQL database through
ZEOS).
Every once in a while, I'm getting an Unable to open file
exception that points to one of the templates the website is using.
What could be the problem?
Maybe you run out of file handles?
If that is the case, shouldn't something be in the syslog or some
other log?
No. It's a generic user error like any other.
Is there any way I can check this for sure like last system error
string or something?
You can call sysutils.GetLastOSError and look up the number in errno.inc
The exception message only says that Unable to open file
filepath_filename.
I checked the /proc/sys/fs/file-max and it shows 294692
The per-user open file handles limit is different. You can see it in the
output of ulimit -a under bash (if it says unlimited, it means that
it uses the system limit). Maybe you leak file handles somewhere. You
can look in /proc/pid/fd from time to time to see whether the number
of open files keeps growing over time.
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