1 files changed, 62 insertions, 0 deletions
diff --git a/bin/helper-functions.sh b/bin/helper-functions.sh
new file mode 100644
index 000000000..1c355e247
--- /dev/null
+++ b/bin/helper-functions.sh
@@ -0,0 +1,62 @@
+#!/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 0
+}