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#!/bin/bash
# Copyright 1999-2012 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# For routines we want to use in ebuild-helpers/ but don't want to
# expose to the general ebuild environment.
source "${PORTAGE_BIN_PATH:-/usr/lib/portage/bin}"/isolated-functions.sh
#
# API functions for doing parallel processing
#
numjobs() {
# Copied from eutils.eclass:makeopts_jobs()
local jobs=$(echo " ${MAKEOPTS} " | \
sed -r -n 's:.*[[:space:]](-j|--jobs[=[:space:]])[[:space:]]*([0-9]+).*:\2:p')
echo ${jobs:-1}
}
multijob_init() {
# Setup a pipe for children to write their pids to when they finish.
mj_control_pipe=$(mktemp -t multijob.XXXXXX)
rm "${mj_control_pipe}"
mkfifo "${mj_control_pipe}"
exec {mj_control_fd}<>${mj_control_pipe}
rm -f "${mj_control_pipe}"
# See how many children we can fork based on the user's settings.
mj_max_jobs=$(numjobs)
mj_num_jobs=0
}
multijob_child_init() {
trap 'echo ${BASHPID} $? >&'${mj_control_fd} EXIT
trap 'exit 1' INT TERM
}
multijob_finish_one() {
local pid ret
read -r -u ${mj_control_fd} pid ret
: $(( --mj_num_jobs ))
return ${ret}
}
multijob_finish() {
local ret=0
while [[ ${mj_num_jobs} -gt 0 ]] ; do
multijob_finish_one
: $(( ret |= $? ))
done
# Let bash clean up its internal child tracking state.
wait
return ${ret}
}
multijob_post_fork() {
: $(( ++mj_num_jobs ))
if [[ ${mj_num_jobs} -ge ${mj_max_jobs} ]] ; then
multijob_finish_one
fi
return $?
}
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