Mail::Box::Locker::Flock(3pm)

1Mail::Box::Locker::FlocUks(e3r)Contributed Perl DocumentMaatiilo:n:Box::Locker::Flock(3)
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NAME

6       Mail::Box::Locker::Flock - lock a folder using kernel file-locking
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INHERITANCE

9        Mail::Box::Locker::Flock
10          is a Mail::Box::Locker
11          is a Mail::Reporter
12

SYNOPSIS

14        See Mail::Box::Locker
15

DESCRIPTION

17       The "::Flock" object locks the folder by creating an exclusive lock on
18       the file using the kernel's "flock" facilities.  This lock is created
19       on a separate file-handle to the folder file, so not the handle which
20       is reading.
21
22       File locking does not work in some situations, for instance for
23       operating systems do not support "flock".
24
25       Extends "DESCRIPTION" in Mail::Box::Locker.
26

METHODS

28       Extends "METHODS" in Mail::Box::Locker.
29
30   Constructors
31       Extends "Constructors" in Mail::Box::Locker.
32
33       Mail::Box::Locker::Flock->new(%options)
34            -Option --Defined in       --Default
35             expires  Mail::Box::Locker  1 hour
36             file     Mail::Box::Locker  undef
37             folder   Mail::Box::Locker  <undef>
38             log      Mail::Reporter     'WARNINGS'
39             method   Mail::Box::Locker  'FLOCK'
40             timeout  Mail::Box::Locker  10
41             trace    Mail::Reporter     'WARNINGS'
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43           expires => SECONDS
44           file => FILENAME
45           folder => FOLDER
46           log => LEVEL
47           method => STRING|CLASS|ARRAY
48           timeout => SECONDS|'NOTIMEOUT'
49           trace => LEVEL
50
51   Attributes
52       Extends "Attributes" in Mail::Box::Locker.
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54       $obj->expires( [SECONDS] )
55           Inherited, see "Attributes" in Mail::Box::Locker
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57       $obj->timeout( [SECONDS] )
58           Inherited, see "Attributes" in Mail::Box::Locker
59
60   The Locker
61       Extends "The Locker" in Mail::Box::Locker.
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63       $obj->filename( [$filename] )
64           Inherited, see "The Locker" in Mail::Box::Locker
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66       $obj->folder( [$folder] )
67           Inherited, see "The Locker" in Mail::Box::Locker
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69       $obj->name()
70           Inherited, see "The Locker" in Mail::Box::Locker
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72   Locking
73       Extends "Locking" in Mail::Box::Locker.
74
75       $obj->hasLock()
76           Inherited, see "Locking" in Mail::Box::Locker
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78       $obj->isLocked()
79       $obj->lock()
80       $obj->unlock()
81           Inherited, see "Locking" in Mail::Box::Locker
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83   Error handling
84       Extends "Error handling" in Mail::Box::Locker.
85
86       $obj->AUTOLOAD()
87           Inherited, see "Error handling" in Mail::Reporter
88
89       $obj->addReport($object)
90           Inherited, see "Error handling" in Mail::Reporter
91
92       $obj->defaultTrace( [$level]|[$loglevel, $tracelevel]|[$level,
93       $callback] )
94       Mail::Box::Locker::Flock->defaultTrace( [$level]|[$loglevel,
95       $tracelevel]|[$level, $callback] )
96           Inherited, see "Error handling" in Mail::Reporter
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98       $obj->errors()
99           Inherited, see "Error handling" in Mail::Reporter
100
101       $obj->log( [$level, [$strings]] )
102       Mail::Box::Locker::Flock->log( [$level, [$strings]] )
103           Inherited, see "Error handling" in Mail::Reporter
104
105       $obj->logPriority($level)
106       Mail::Box::Locker::Flock->logPriority($level)
107           Inherited, see "Error handling" in Mail::Reporter
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109       $obj->logSettings()
110           Inherited, see "Error handling" in Mail::Reporter
111
112       $obj->notImplemented()
113           Inherited, see "Error handling" in Mail::Reporter
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115       $obj->report( [$level] )
116           Inherited, see "Error handling" in Mail::Reporter
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118       $obj->reportAll( [$level] )
119           Inherited, see "Error handling" in Mail::Reporter
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121       $obj->trace( [$level] )
122           Inherited, see "Error handling" in Mail::Reporter
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124       $obj->warnings()
125           Inherited, see "Error handling" in Mail::Reporter
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127   Cleanup
128       Extends "Cleanup" in Mail::Box::Locker.
129
130       $obj->DESTROY()
131           Inherited, see "Cleanup" in Mail::Box::Locker
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DIAGNOSTICS

134       Warning: Folder $folder already flocked
135           The folder is already locked, but you attempt to lock it again.
136           The behavior of double flock's is platform dependent, and therefore
137           should not be attempted.  The second lock is ignored (but the
138           unlock isn't)
139
140       Error: Package $package does not implement $method.
141           Fatal error: the specific package (or one of its superclasses) does
142           not implement this method where it should. This message means that
143           some other related classes do implement this method however the
144           class at hand does not.  Probably you should investigate this and
145           probably inform the author of the package.
146
147       Error: Unable to check lock file $filename for $folder: $!
148           To check whether the filename is used to flock a folder, the file
149           must be opened.  Apparently this fails, which does not mean that
150           the folder is locked neither that it is unlocked.
151
152       Error: Unable to open flock file $filename for $folder: $!
153           For flock-ing a folder it must be opened, which does not succeed
154           for the specified reason.
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156       Error: Will never get a flock at $filename for $folder: $!
157           Tried to flock the folder, but it did not succeed.  The error code
158           received from the OS indicates that it will not succeed ever, so we
159           do not need to try again.
160

LICENSE

166       Copyrights 2001-2019 by [Mark Overmeer]. For other contributors see
167       ChangeLog.
168
169       This program is free software; you can redistribute it and/or modify it
170       under the same terms as Perl itself.  See http://dev.perl.org/licenses/
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174perl v5.28.1                      2019-02-15       Mail::Box::Locker::Flock(3)