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As pg found out in the threads Perl 5.8.2 thread is much worse and Perl 5.8.2 thread is worse - more findings from today, it is now confirmed that indeed you can not reliably detach threads on Win32 systems.

Since the root cause is now known, a workaround of the problem is now also easy to do. Which I've done in the form of a new module: Thread::Detach (also available from if it hasn't arrived on a CPAN mirror near you yet).

From the pod:

All of this happens on Windows only and if the version of the Perl executor is known to have the problem.

This module replaces the standard threads->detach method with another subroutine that just sets an internal flag to mark the thread as "detached".

Futhermore it uses Thread::Exit to register a subroutine that is executed after each thread is finished executing: this subroutine marks the thread as "done".

Lastly, it uses Thread::Exit to register a subroutine that is executed at the beginning of each thread: this subroutine reaps all the threads that were marked "done", hence providing the necessary cleanup.

Unfortunately, I have not been able to really test the module, as I don't do Windows myself. So I appreciate any bug reports, should there be any (which will undoubtedly be the case).

This module should allow you to run all your threaded applications that used threads->detach unchanged by adding -MThread::Detach to the command line, or by setting the PERL5OPT environment variable.


In reply to Can't detach threads on Windows: Thread::Detach 0.01 by liz

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