Parallel::ForkManager install fails

cormanaz has asked for the wisdom of the Perl Monks concerning the following question:

When I try to install Parallel::ForkManager on Windoze 10 it fails:

Test Summary Report
-------------------
t/start_child.t         (Wstat: 1280 Tests: 0 Failed: 0)
  Non-zero exit status: 5
  Parse errors: Bad plan.  You planned 2 tests but ran 0.
t/waitpid-conflict.t    (Wstat: 0 Tests: 2 Failed: 0)
  TODO passed:   1-2
t/waitpid-waitonechild.t (Wstat: 0 Tests: 3 Failed: 0)
  TODO passed:   2-3
Files=12, Tests=26, 74 wallclock secs ( 0.05 usr +  0.02 sys =  0.06 C
+PU)
Result: FAIL
Failed 1/12 test programs. 0/26 subtests failed.
dmake.exe:  Error code 255, while making 'test_dynamic'
-> FAIL Installing Parallel::ForkManager failed. See C:\Users\boss\.cp
+anm\work\1712513913.232104\build.log for details. Retry with --force 
+to force install it.
Expiring 2 work directories.
[download]

The docs list no test results of the current version on Windoze. Is there anything I can do to fix this?

Comment on Parallel::ForkManager install fails Download Code

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Re: Parallel::ForkManager install fails by choroba (Cardinal) on Apr 07, 2024 at 21:36 UTC
The first step would be to read the mentioned log file and post the relevant parts here. `map{substr$_->[0],$_->[1]\|\|0,1}[\\|\|{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^ARGV,3]`	[reply] [d/l]
Re^2: Parallel::ForkManager install fails by cormanaz (Deacon) on Apr 08, 2024 at 19:16 UTC
That's what I did above	[reply]
Re^3: Parallel::ForkManager install fails by choroba (Cardinal) on Apr 08, 2024 at 21:40 UTC
> See C:\Users\boss\.cpanm\work\1712513913.232104\build.log for details. Did you? Where's the contents of the log file, then? `map{substr$_->[0],$_->[1]\|\|0,1}[\\|\|{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^ARGV,3]`	[reply] [d/l]
Re: Parallel::ForkManager install fails by ikegami (Patriarch) on Apr 08, 2024 at 00:29 UTC
P::FM doesn't make much sense in Windows, which doesn't have the ability to `fork`.^[1] Perl emulates it using threads. So why not just use threads directly? Not entirely impossible. Cygwin and MSYS use some internals to achieve it, or at least something closer than using threads.	[reply] [d/l]
Re: Parallel::ForkManager install fails by swl (Prior) on Apr 07, 2024 at 21:49 UTC
The logs you provide report dmake, which suggests an older version of Strawberry perl. As choroba noted in 11158744, Can you provide more details so others can try to reproduce? In saying that, it works fine for me when using Strawberry Perl 5.38.2.2 (gmake) and 5.20.3.3 (dmake).	[reply]
Re: Parallel::ForkManager install fails by eyepopslikeamosquito (Archbishop) on Apr 08, 2024 at 23:12 UTC
Like the others, I advise you to stay away from Perl's fork emulation on Windows, too many surprises and general weirdness. If you provide more detail on the specific problem you are trying to solve, we will be able to better advise you. You might be interested in: MCE by marioroy : Many-Core Engine for Perl providing parallel processing capabilities - can be configured to use processes or threads (via `use_threads` parameter), by default MCE spawns child processes on UNIX platforms and threads on Windows Update: this reply by marioroy to the OP two weeks ago contains examples, including one using `MCE::Child` with `Parallel::ForkManager` similarities. 👁️🍾👍🦟	[reply] [d/l] [select]
Re^2: Parallel::ForkManager install fails by NERDVANA (Priest) on Apr 12, 2024 at 07:29 UTC
Or, use the cygwin version of perl on Windows, which does support fork.	[reply]
Re^3: Parallel::ForkManager install fails by eyepopslikeamosquito (Archbishop) on Apr 12, 2024 at 10:16 UTC
Or, use the cygwin version of perl on Windows, which does support fork I usually prefer separate code paths for Unix vs Windows code that manipulates processes. One example that springs to mind is Re: How to portably stop processes? (Timing out Commands on Unix and Windows and Win32:: References), with links to sample code to create, time, and kill processes on Unix (via fork, exec, kill, waitpid) and Windows (via Win32::Job). Unfortunately, we have no information on the OP's environment and the specific problem/s that need to be solved (and why the OP feels that Parallel::ForkManager is the best way to solve them) ... and, sadly, it's looking increasingly likely that we won't hear from the OP again in this thread. 👁️🍾👍🦟	[reply]
Re: Parallel::ForkManager install fails by stevieb (Canon) on Apr 08, 2024 at 09:37 UTC
The docs list no test results of the current version on Windoze. Is there anything I can do to fix this? It's "Windows", for what it's worth. As ikegami stated, `fork()` does not work within the Windows OS, so it isn't surprising that a) there are no test results for the distribution and b) unit tests fail on a Windows system. Use an OS that inherently uses `fork` to create separate processes, or use threading.	[reply] [d/l] [select]