NAME

       Test2::Util - Tools used by Test2 and friends.

DESCRIPTION

       Collection of tools used by Test2 and friends.

EXPORTS

       All exports are optional. You must specify subs to import.

       ($success, $error) = try { ... }
           Eval the codeblock, return success or failure, and the error message. This code
           protects $@ and $!, they will be restored by the end of the run. This code also
           temporarily blocks $SIG{DIE} handlers.

       protect { ... }
           Similar to try, except that it does not catch exceptions. The idea here is to protect
           $@ and $! from changes. $@ and $! will be restored to whatever they were before the
           run so long as it is successful. If the run fails $! will still be restored, but $@
           will contain the exception being thrown.

       CAN_FORK
           True if this system is capable of true or pseudo-fork.

       CAN_REALLY_FORK
           True if the system can really fork. This will be false for systems where fork is
           emulated.

       CAN_THREAD
           True if this system is capable of using threads.

       USE_THREADS
           Returns true if threads are enabled, false if they are not.

       get_tid
           This will return the id of the current thread when threads are enabled, otherwise it
           returns 0.

       my $file = pkg_to_file($package)
           Convert a package name to a filename.

       $string = ipc_separator()
           Get the IPC separator. Currently this is always the string '~'.

       $string = gen_uid()
           Generate a unique id (NOT A UUID). This will typically be the process id, the thread
           id, the time, and an incrementing integer all joined with the "ipc_separator()".

           These ID's are unique enough for most purposes. For identical ids to be generated you
           must have 2 processes with the same PID generate IDs at the same time with the same
           current state of the incrementing integer. This is a perfectly reasonable thing to
           expect to happen across multiple machines, but is quite unlikely to happen on one
           machine.

           This can fail to be unique if a process generates an id, calls exec, and does it again
           after the exec and it all happens in less than a second. It can also happen if the
           systems process id's cycle in less than a second allowing 2 different programs that
           use this generator to run with the same PID in less than a second. Both these cases
           are sufficiently unlikely. If you need universally unique ids, or ids that are unique
           in these conditions, look at Data::UUID.

       ($ok, $err) = do_rename($old_name, $new_name)
           Rename a file, this wraps "rename()" in a way that makes it more reliable cross-
           platform when trying to rename files you recently altered.

       ($ok, $err) = do_unlink($filename)
           Unlink a file, this wraps "unlink()" in a way that makes it more reliable cross-
           platform when trying to unlink files you recently altered.

       ($ok, $err) = try_sig_mask { ... }
           Complete an action with several signals masked, they will be unmasked at the end
           allowing any signals that were intercepted to get handled.

           This is primarily used when you need to make several actions atomic (against some
           signals anyway).

           Signals that are intercepted:

           SIGINT
           SIGALRM
           SIGHUP
           SIGTERM
           SIGUSR1
           SIGUSR2

NOTES && CAVEATS

       5.10.0
           Perl 5.10.0 has a bug when compiled with newer gcc versions. This bug causes a
           segfault whenever a new thread is launched. Test2 will attempt to detect this, and
           note that the system is not capable of forking when it is detected.

       Devel::Cover
           Devel::Cover does not support threads. CAN_THREAD will return false if Devel::Cover is
           loaded before the check is first run.

SOURCE

       The source code repository for Test2 can be found at
       http://github.com/Test-More/test-more/.

MAINTAINERS

       Chad Granum <exodist@cpan.org>

AUTHORS

       Chad Granum <exodist@cpan.org>
       Kent Fredric <kentnl@cpan.org>

COPYRIGHT

       Copyright 2020 Chad Granum <exodist@cpan.org>.

       This program is free software; you can redistribute it and/or modify it under the same
       terms as Perl itself.

       See http://dev.perl.org/licenses/