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Top Forums Programming Periodic thread with clock_nanosleep Post 302741365 by laro1983 on Saturday 8th of December 2012 08:32:55 AM
Old 12-08-2012
Periodic thread with clock_nanosleep

Hi
I have a periodic task (with the highest priority) which I away every X nano-second.
I am using the function clock_nanosleep with REAL_TIME timer.
when I wake up, I versify that I was awake on time,
and check if the delta between the last time I get to sleep and the current time is X nano-second.
(I verify this with the function clock_gettime, and again with REAL_TIME timer).
sometimes when the thread wake up, the delta is not X nano second (it can be sometimes less or high above
X nanosecond)
I am connected to NTP.

1. why sometimes the thread wake up before or after X nano second (I see this through the delta)
2. if the reason is the NTP and REAL_TIME timer, why the thread wake up after it finish to sleep
and the delta is less than X nano second ?

Thanks
 

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RNANO(1)						      General Commands Manual							  RNANO(1)

NAME
rnano - Restricted mode for Nano's ANOther editor, an enhanced free Pico clone SYNOPSIS
rnano [OPTIONS] [[+LINE,COLUMN] FILE]... DESCRIPTION
This manual page briefly documents the rnano command. nano is a small, free and friendly editor which aims to replace Pico, the default editor included in the non-free Pine package. Rather than just copying Pico's look and feel, nano also implements some missing (or disabled by default) features in Pico, such as "search and replace" and "go to line and column number". rnano is a restricted version of nano, which only edits specific files and doesn't allow the user access to the filesystem or a command shell. In restricted mode, nano will not: o read or write to any file not specified on the command line; o read any nanorc files; o allow suspending; o allow a file to be appended to, prepended to, or saved under a different name; o use backup files or spell checking. OPTIONS
+LINE,COLUMN Places cursor at line number LINE and column number COLUMN (at least one of which must be specified) on startup, instead of the default of line 1, column 1. -? Same as -h (--help). -h (--help) Show a summary of command line options and exit. -V (--version) Show the current version number and exit. See the nano(1) manpage for the complete documentation of nano. BUGS
Please send any comments or bug reports to nano@nano-editor.org. The nano mailing list is available from nano-devel@gnu.org. To subscribe, email to nano-devel-request@gnu.org with a subject of "subscribe". HOMEPAGE
http://www.nano-editor.org/ AUTHOR
Chris Allegretta <chrisa@asty.org>, et al (see AUTHORS for details). This manual page was originally written by Thijs Kinkhorst <thijs@kinkhorst.com>, for the Debian system (but may be used by others). August 23, 2007 version 2.0.0 RNANO(1)
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