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# This program is copyright 2013 Percona Ireland Ltd.
# Feedback and improvements are welcome.
#
# THIS PROGRAM IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
# WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
# MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
#
# This program is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation, version 2; OR the Perl Artistic License. On UNIX and similar
# systems, you can issue `man perlgpl' or `man perlartistic' to read these
# licenses.
#
# You should have received a copy of the GNU General Public License along with
# this program; if not, write to the Free Software Foundation, Inc., 59 Temple
# Place, Suite 330, Boston, MA 02111-1307 USA.
# ###########################################################################
# subshell package
# ###########################################################################
# Package: subshell
set -u
wait_for_subshells() {
local max_wait=$1
if [ "$(jobs)" ]; then
log "Waiting up to $max_wait seconds for subprocesses to finish..."
local slept=0
while [ -n "$(jobs)" ]; do
local subprocess_still_running=""
for pid in $(jobs -p); do
if kill -0 $pid >/dev/null 2>&1; then
subprocess_still_running=1
fi
done
if [ "$subprocess_still_running" ]; then
sleep 1
slept=$((slept + 1))
[ $slept -ge $max_wait ] && break
else
break
fi
done
fi
}
kill_all_subshells() {
if [ "$(jobs)" ]; then
for pid in $(jobs -p); do
if kill -0 $pid >/dev/null 2>&1; then
# This isn't an warning (we don't want exit status 1) because
# the system may be running slowly so it's just "natural" that
# a collector may get stuck or run really slowly.
log "Killing subprocess $pid"
kill $pid >/dev/null 2>&1
fi
done
else
log "All subprocesses have finished"
fi
}
# ###########################################################################
# End subshell package
# ###########################################################################
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