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Efficient logging of time measurements

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# 15  
Old 03-10-2013
Instead of pipes -- if you're worried about resources or blocking, simply use a single thread that reads a message queue. Once a message queue (SYSV or POSIX) is set up there is a single syscall ( e.g., msgsnd, no blocking ) that is mt-safe and a mutex is not required.

The buffersize, unlike, a pipe, can be any size. The message queue buffer is kernel persistent, so if the entire set of threads/processes using the message queue die, the data is still available. Pipes are closed on process termination.
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LEARN ABOUT MOJAVE

datetime::timezone::olsondb5.18

DateTime::TimeZone::OlsonDB(3)				User Contributed Perl Documentation			    DateTime::TimeZone::OlsonDB(3)

NAME

       DateTime::TimeZone::OlsonDB - An object to represent an Olson time zone database

VERSION

       version 1.63

SYNOPSIS

	 none yet

DESCRIPTION

       This module parses the Olson database time zone definition files and creates various objects representing time zone data.

       Each time zone is broken down into several parts.  The first piece is an observance, which is an offset from UTC and an abbreviation.  A
       single zone may contain many observances, reflecting historical changes in that time zone over time.  An observance may also refer to a set
       of rules.

       Rules are named, and may apply to many different zones.	For example, the "US" rules apply to most of the time zones in the US,
       unsurprisingly.	Rules are made of an offset from standard time and a definition of when that offset changes.  Changes can be a one time
       thing, or they can recur at regular times through a span of years.

       Each rule may have an associated letter, which is used to generate an abbreviated name for the time zone, along with the offset's
       abbreviation.  For example, if the offset's abbreviation is "C%sT", and the a rule specifies the letter "S", then the abbreviation when
       that rule is in effect is "CST".

USAGE

       Not yet documented.  This stuff is a mess.

AUTHOR

       Dave Rolsky <autarch@urth.org>

COPYRIGHT AND LICENSE

       This software is copyright (c) 2013 by Dave Rolsky.

       This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

perl v5.18.2							    2013-10-28					    DateTime::TimeZone::OlsonDB(3)