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  • Access denied from another thread

    - by Lobuno
    Hello! In a program I span a thread ("the working thread"). Hera I copy some files write some data to a database and eventually, delete some other files or directories. Everything works fine. The problem is now, that I decided to move the deleting operation to some other thread. So the working thread now copies the files or directories, writes to the database, and , if there is a need to delete some other files this thread spans another thread and that second thread deleted the needed files or directories. The problem is that,the deletion used to work 100% when done in the working thread, now when the same is done in the secondary thread, I sometimes get an "Access denied" error and the files cannot be deleted. And no, the working thread is definitely NOT acceding the files and directories to delete at this moment. Sometimes (but not always) the main thread is impersonating some user, so if needed , the deleting thread is also running under impersonation just to grant the needed permissions to delete the files, so that should not be the problem. Anybody has a clue why this could be happening?

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  • Does the managed main UI thread stay on the same (unmanaged) Operation System thread?

    - by Daniel Rose
    I am creating a managed WPF UI front-end to a legacy Win32-application. The WPF front-end is the executable; as part of its startup routines I start the legacy app as a DLL in a second thread. Any UI-operation (including CreateWindowsEx, etc.) by the legacy app is invoked back on the main UI-thread. As part of the shutdown process of the app I want to clean up properly. Among other things, I want to call DestroyWindow on all unmanaged windows, so they can properly clean themselves up. Thus, during shutdown I use EnumWindows to try to find all my unmanaged windows. Then I call DestroyWindow one the list I generate. These run on the main UI-thread. After this background knowledge, on to my actual question: In the enumeration procedure of EnumWindows, I have to check if one of the returned top-level windows is one of my unmanaged windows. I do this by calling GetWindowThreadProcessId to get the process id and thread id of the window's creator. I can compare the process id with Process.GetCurrentProcess().Id to check if my app created it. For additional security, I also want to see if my main UI-thread created the window. However, the returned thread id is the OS's ThreadId (which is different than the managed thread id). As explained in this question, the CLR reserves the right to re-schedule the managed thread to different OS threads. Can I rely on the CLR to be "smart enough" to never do this for the main UI thread (due to thread-affinity of the UI)? Then I could call GetCurrentThreadId to get the main UI-thread's unmanaged thread id for comparison.

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  • Is there any performance comparison between Perl web frameworks?

    - by DVK
    I have seen mentions (which sounded like unsubstantiated opinions, and dated ones at that) that Embperl is the fastest Perl web framework. I was wondering if there's a consensus on the relative speed of the major stable Perl web frameworks, or ideally, some sort of fact-based performance comparisons between implementations of the same sample webapps, or individual functionalities (e.g. session handling or form data processing), etc...?

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  • How can I get a call stack listing in Perl?

    - by slashmais
    Is there a way I can access (for printout) a list of sub + module to arbitrary depth of sub-calls preceding a current position in a Perl script? I need to make changes to some Perl modules (.pm's). The workflow is initiated from a web-page thru a cgi-script, passing input through several modules/objects ending in the module where I need to use the data. Somewhere along the line the data got changed and I need to find out where.

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  • Why can't the w3c validator find the Perl's SGML::Parser::OpenSP?

    - by coure06
    I have installed W3C validator locally on Windows, following their instructions. I am getting this error while validating a site: Can't locate loadable object for module SGML::Parser::OpenSP in @INC (@INC contains: C:/www/perl/site/lib C:/www/perl/lib .) at C:/www/validator/httpd/cgi-bin/check line 60 Compilation failed in require at C:/www/validator/httpd/cgi-bin/check line 60. BEGIN failed--compilation aborted at C:/www/validator/httpd/cgi-bin/check line 60. I am using SGML::Parser::OpenSP 0.991 module.

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  • How can I use Perl's s/// in an expression?

    - by mikeY
    I got a headache looking for this: How do you use s/// in an expression as opposed to an assignment. To clarify what I mean, I'm looking for a perl equivalent of python's re.sub(...) when used in the following context: newstring = re.sub('ab', 'cd', oldstring) The only way I know how to do this in perl so far is: $oldstring =~ s/ab/cd/; $newstring = $oldstring; Note the extra assignment.

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  • Is there something like "New Relic" for Perl apps?

    - by Cninroh
    We have successfully migrated all of our PHP and Ruby apps to use New Relic RPM both for Application performance measurements and server monitoring. We are very please with results, which have enabled us to improve the overall performance of the platfrom numeral times. We still have a lot of Perl applications which we need to support for legacy purposes, but in comparison to our New Relic powred apps we are completely blind to whats happening inside the apps and in peak hours. Is there something like "New Relic" for Perl apps?

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  • What is the difference between using $1 vs \1 in Perl regex substitutions?

    - by Mr Foo Bar
    I'm debugging some code and wondered if there is any practical difference between $1 and \1 in Perl regex substitutions For example: my $package_name = "Some::Package::ButNotThis"; $package_name =~ s{^(\w+::\w+)}{$1}; print $package_name; # Some::Package This following line seems functionally equivalent: $package_name =~ s{^(\w+::w+)}{\1}; Are there subtle differences between these two statements? Do they behave differently in different versions of Perl?

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  • How to execute a perl script within php and capture error messages?

    - by Marcel Tjandraatmadja
    I am trying to execute a Perl script like so: /usr/bin/ec2-consistent-snapshot 'vol-dr3131c2' When the Perl script fails it exits using 'die' and prints out an error message. I can see that error message when executing manually, but I am failing to capture it through PHP. I tried the following with no success: exec($command,$output); echo system($command,$output); passthru($command); Any ideas?

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  • As a PHP developer thinking of making Perl a secondary strong suit, what do I need to know?

    - by Hexagon Theory
    I consider myself quite fluent in PHP and am rather familiar with nearly all of the important aspects and uses, as well as its pratfalls. This in mind, I think the major problem in taking on Perl is going to be with the syntax. Aside from this (a minor hindrance, really, as I'm rather sold on the fact that Perl's is far more readable), what are some key differences you think I should make myself aware of prior to taking on the language?

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  • How can I check the MIME type of an uploaded file using Perl CGI?

    - by FOOM
    I'm trying to get the MIME type of an <input type="file" /> element using Perl, but without actually examining the contents of the file itself, In other words, just using the HTTP headers. I have only been able to get the "multipart/form-type" Content-Type value, but my understanding is that each element will get its own MIME Type? How can I see the sub-MIME types using Perl?

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  • What is the best GUI for Perl on Windows including a good GUI builder?

    - by panofish
    I want to build perl apps with a gui that: A: are windows compatible (no cygwin or the like) B: utilize a nice GUI builder C: is easily distributed (minimizing additional components that must be installed) D: has good documentation and tutorials for building and using the GUI E: is still be developed (has a future) and appears to be the future of perl GUIs Maybe someone could provide a table something like the following for the alternatives (wxperl, perlqt, tk gtk2...etc)?: tool1 = AB tool2 = CE tool3 = ACD ...

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  • Is it possible to create a FIPS 140-2 compliant server in Perl?

    - by Nayruden
    The question is pretty simple, is it possible to create a FIPS 140-2 compliant server in Perl? Especially, is it possible without modifying any of the C code for the modules? If it's not possible in straight Perl, what would be the easiest way to go about it from a C perspective? I'm basically creating a mini-httpd that only serves up a single file, but due to security restrictions it needs to be served up on SSL under FIPS compliance.

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