Introduce the parallel variant of python_foreach_impl().

1 files changed, 55 insertions, 1 deletions

diff --git a/eclass/python-r1.eclass b/eclass/python-r1.eclass
index 5b2e8b6b4da1..ec75d4ab8331 100644
--- a/eclass/python-r1.eclass
+++ b/eclass/python-r1.eclass
@@ -1,6 +1,6 @@
 # Copyright 1999-2013 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
-# $Header: /var/cvsroot/gentoo-x86/eclass/python-r1.eclass,v 1.41 2013/02/26 14:32:49 mgorny Exp $
+# $Header: /var/cvsroot/gentoo-x86/eclass/python-r1.eclass,v 1.42 2013/02/26 14:33:45 mgorny Exp $
 
 # @ECLASS: python-r1
 # @MAINTAINER:
@@ -173,6 +173,14 @@ _python_set_globals() {
 }
 _python_set_globals
 
+# @ECLASS-VARIABLE: DISTUTILS_JOBS
+# @DEFAULT_UNSET
+# @DESCRIPTION:
+# The number of parallel jobs to run for distutils-r1 parallel builds.
+# If unset, the job-count in ${MAKEOPTS} will be used.
+#
+# This variable is intended to be set in make.conf.
+
 # @FUNCTION: _python_validate_useflags
 # @INTERNAL
 # @DESCRIPTION:
@@ -623,6 +631,52 @@ python_foreach_impl() {
 	return ${ret}
 }
 
+# @FUNCTION: python_parallel_foreach_impl
+# @USAGE: <command> [<args>...]
+# @DESCRIPTION:
+# Run the given command for each of the enabled Python implementations.
+# If additional parameters are passed, they will be passed through
+# to the command.
+#
+# The function will return 0 status if all invocations succeed.
+# Otherwise, the return code from first failing invocation will
+# be returned.
+#
+# For each command being run, EPYTHON, PYTHON and BUILD_DIR are set
+# locally, and the former two are exported to the command environment.
+#
+# Multiple invocations of the command will be run in parallel, up to
+# DISTUTILS_JOBS (defaulting to '-j' option argument from MAKEOPTS).
+python_parallel_foreach_impl() {
+	debug-print-function ${FUNCNAME} "${@}"
+
+	local ret lret
+
+	_python_parallel() {
+		(
+			multijob_child_init
+			"${@}"
+		) &
+		multijob_post_fork
+	}
+
+	local opts
+	if [[ ${DISTUTILS_JOBS} ]]; then
+		opts=-j${DISTUTILS_JOBS}
+	else
+		opts=${MAKEOPTS}
+	fi
+
+	multijob_init "${opts}"
+	python_foreach_impl _python_parallel "${@}"
+	ret=${?}
+	multijob_finish
+	lret=${?}
+
+	[[ ${ret} -eq 0 ]] && ret=${lret}
+	return ${ret}
+}
+
 # @FUNCTION: python_export_best
 # @USAGE: [<variable>...]
 # @DESCRIPTION: