#!/bin/sh
# -*- sh -*-
# vim: ft=sh

: << =cut

=head1 NAME

threads - Plugin to monitor the number of threads on Linux

=head1 CONFIGURATION

No configuration

=head1 AUTHOR

Lars Strand

=head1 LICENSE

GNU GPL

=head1 MAGIC MARKERS

 #%# family=auto
 #%# capabilities=autoconf

=cut

if [ "$1" = "autoconf" ]; then
    grep -q '^Threads' /proc/$$/status && echo "yes" || echo "no"
    exit 0
fi

if [ "$1" = "config" ]; then
    echo 'graph_title Number of threads'
    #echo 'graph_args --base 1000 -l 0 '
    echo 'graph_vlabel number of threads'
    echo 'graph_category processes'
    echo 'graph_info This graph shows the number of threads.'
    echo 'threads.label threads'
    echo 'threads.info The current number of threads.'
    exit 0
fi

# -s suppresses errors about files that vanished before they could
# be read.  It isn't entirely portable, but GNU grep should be a given on
# Linux.  Sadly awk has no such equivalent option or we could skip grep
# altogether
grep -s '^Threads' /proc/[0-9]*/status | awk '{ sum += $2; } END { print "threads.value", sum; }'