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.
85
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 2020 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 v5.32.1                      2021-01-27                    Test2::Util(3)
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