Thread-Multi or Non-Threaded? Choosing the Right Chilkat Perl Module

1. Check the threading setting (quickest)

This prints just the threading flag:

perl -V:useithreads

Output is either useithreads='define'; (threaded → thread-multi) or useithreads='undef'; (non-threaded → regular).

2. Or read the full configuration

Run perl -V and look for useithreads (older Perls may show usethreads):

Summary of my perl5 (revision 5 version 30 subversion 3) configuration:

  Platform:
    osname=darwin
    archname=darwin-thread-multi-2level
    ...
    useithreads=define
    usemultiplicity=define
    ...

Here useithreads=define means the thread-multi build is required. Notice the archname also contains thread-multi.

3. Or check the module paths

Threaded Perl installations use a thread-multi directory in @INC:

perl -e 'print "@INC\n";'

Example:

/usr/lib/perl5/5.34/thread-multi
/usr/lib/perl5/5.34

If thread-multi appears in the paths, your Perl is threaded.

Systems with more than one Perl

• If several Perls are installed (system Perl, a custom build, etc.), make sure you check the one you'll actually use. Confirm with which perl before running perl -V:useithreads.
• On macOS, your Perl may come from brew, perlbrew, or the system — each can have different threading settings.