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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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hp-check

hp-check(1)							   User Manuals 						       hp-check(1)

NAME

       hp-check - Dependency/Version Check Utility

DESCRIPTION

       Check the existence and versions of HPLIP dependencies. (Run as 'python ./check.py' from the HPLIP tarball before installation.)

SYNOPSIS

       hp-check [OPTIONS]

OPTIONS

       Compile-time check:
	      -c or --compile

       Run-time check:
	      -r or --run

       Compile and run-time checks:
	      -b or --both (default)

       Fix the found issues on confirmation:
	      --fix

       Set the logging level:
	      -l<level> or --logging=<level> <level>: none, info*, error, warn, debug (*default)

       Run in debug mode:
	      -g (same as option: -ldebug)

       Output plain text only:
	      -t

       This help information:
	      -h or --help

NOTES

       1. For checking for the proper build environment for the HPLIP supplied tarball (.tar.gz or .run),

       use the --compile or --both switches.

       2. For checking for the proper runtime environment for a distro supplied package (.deb, .rpm, etc),

       use the --runtime switch.

AUTHOR

       HPLIP  (Hewlett-Packard Linux Imaging and Printing) is an HP developed solution for printing, scanning, and faxing with HP inkjet and laser
       based printers in Linux.

REPORTING BUGS

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       or otherwise contact the HPLIP Team.

COPYRIGHT

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       This software comes with ABSOLUTELY NO WARRANTY.  This is free software, and you are welcome to distribute it under certain conditions. See
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