Re^2: Get the process id, and output of a process, in a threaded environment

The problem is that on non MSWin systems, external commands are invoked with main thread's ENV, not the local one (as documented in the linked page):

$ perl -Mthreads -e 'async { local %ENV = %ENV; $ENV{CPU} = "/"; open 
+my $PIPE, "echo \$CPU |"; print <$PIPE>}->join; $ENV{CPU}="MSWin"; sy
+stem "echo \$CPU"'
x86_64
MSWin
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