1Test2::Util(3)        User Contributed Perl Documentation       Test2::Util(3)
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NAME

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

9       Collection of tools used by Test2 and friends.
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EXPORTS

12       All exports are optional. You must specify subs to import.
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14       ($success, $error) = try { ... }
15           Eval the codeblock, return success or failure, and the error
16           message. This code protects $@ and $!, they will be restored by the
17           end of the run. This code also temporarily blocks $SIG{DIE}
18           handlers.
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20       protect { ... }
21           Similar to try, except that it does not catch exceptions. The idea
22           here is to protect $@ and $! from changes. $@ and $! will be
23           restored to whatever they were before the run so long as it is
24           successful. If the run fails $! will still be restored, but $@ will
25           contain the exception being thrown.
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27       CAN_FORK
28           True if this system is capable of true or pseudo-fork.
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30       CAN_REALLY_FORK
31           True if the system can really fork. This will be false for systems
32           where fork is emulated.
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34       CAN_THREAD
35           True if this system is capable of using threads.
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37       USE_THREADS
38           Returns true if threads are enabled, false if they are not.
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40       get_tid
41           This will return the id of the current thread when threads are
42           enabled, otherwise it returns 0.
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44       my $file = pkg_to_file($package)
45           Convert a package name to a filename.
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47       $string = ipc_separator()
48           Get the IPC separator. Currently this is always the string '~'.
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50       $string = gen_uid()
51           Generate a unique id (NOT A UUID). This will typically be the
52           process id, the thread id, the time, and an incrementing integer
53           all joined with the "ipc_separator()".
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55           These ID's are unique enough for most purposes. For identical ids
56           to be generated you must have 2 processes with the same PID
57           generate IDs at the same time with the same current state of the
58           incrementing integer. This is a perfectly reasonable thing to
59           expect to happen across multiple machines, but is quite unlikely to
60           happen on one machine.
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62           This can fail to be unique if a process generates an id, calls
63           exec, and does it again after the exec and it all happens in less
64           than a second. It can also happen if the systems process id's cycle
65           in less than a second allowing 2 different programs that use this
66           generator to run with the same PID in less than a second. Both
67           these cases are sufficiently unlikely. If you need universally
68           unique ids, or ids that are unique in these conditions, look at
69           Data::UUID.
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71       ($ok, $err) = do_rename($old_name, $new_name)
72           Rename a file, this wraps "rename()" in a way that makes it more
73           reliable cross-platform when trying to rename files you recently
74           altered.
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76       ($ok, $err) = do_unlink($filename)
77           Unlink a file, this wraps "unlink()" in a way that makes it more
78           reliable cross-platform when trying to unlink files you recently
79           altered.
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81       ($ok, $err) = try_sig_mask { ... }
82           Complete an action with several signals masked, they will be
83           unmasked at the end allowing any signals that were intercepted to
84           get handled.
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86           This is primarily used when you need to make several actions atomic
87           (against some signals anyway).
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89           Signals that are intercepted:
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91           SIGINT
92           SIGALRM
93           SIGHUP
94           SIGTERM
95           SIGUSR1
96           SIGUSR2
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NOTES && CAVEATS

99       5.10.0
100           Perl 5.10.0 has a bug when compiled with newer gcc versions. This
101           bug causes a segfault whenever a new thread is launched. Test2 will
102           attempt to detect this, and note that the system is not capable of
103           forking when it is detected.
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105       Devel::Cover
106           Devel::Cover does not support threads. CAN_THREAD will return false
107           if Devel::Cover is loaded before the check is first run.
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SOURCE

110       The source code repository for Test2 can be found at
111       http://github.com/Test-More/test-more/.
112

MAINTAINERS

114       Chad Granum <exodist@cpan.org>
115

AUTHORS

117       Chad Granum <exodist@cpan.org>
118       Kent Fredric <kentnl@cpan.org>
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121       Copyright 2019 Chad Granum <exodist@cpan.org>.
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123       This program is free software; you can redistribute it and/or modify it
124       under the same terms as Perl itself.
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126       See http://dev.perl.org/licenses/
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130perl v5.30.2                      2020-03-31                    Test2::Util(3)
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