Added the current setup

1 files changed, 109 insertions, 0 deletions

diff --git a/eclass/multiprocessing.eclass b/eclass/multiprocessing.eclass
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+++ b/eclass/multiprocessing.eclass
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+# Copyright 1999-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+# @ECLASS: multiprocessing.eclass
+# @MAINTAINER:
+# base-system@gentoo.org
+# @AUTHOR:
+# Brian Harring <ferringb@gentoo.org>
+# Mike Frysinger <vapier@gentoo.org>
+# @SUPPORTED_EAPIS: 5 6 7 8
+# @BLURB: multiprocessing helper functions
+# @DESCRIPTION:
+# The multiprocessing eclass contains a suite of utility functions
+# that could be helpful to controlling parallel multiple job execution.
+# The most common use is processing MAKEOPTS in order to obtain job
+# count.
+#
+# @EXAMPLE:
+#
+# @CODE
+# src_compile() {
+#   # custom build system that does not support most of MAKEOPTS
+#   ./mybs -j$(makeopts_jobs)
+# }
+# @CODE
+
+case ${EAPI:-0} in
+	[5678]) ;;
+	*) die "${ECLASS}: EAPI ${EAPI:-0} not supported" ;;
+esac
+
+if [[ -z ${_MULTIPROCESSING_ECLASS} ]]; then
+_MULTIPROCESSING_ECLASS=1
+
+# @FUNCTION: get_nproc
+# @USAGE: [${fallback:-1}]
+# @DESCRIPTION:
+# Attempt to figure out the number of processing units available.
+# If the value can not be determined, prints the provided fallback
+# instead. If no fallback is provided, defaults to 1.
+get_nproc() {
+	local nproc
+
+	# GNU
+	if type -P nproc &>/dev/null; then
+		nproc=$(nproc)
+	fi
+
+	# BSD
+	if [[ -z ${nproc} ]] && type -P sysctl &>/dev/null; then
+		nproc=$(sysctl -n hw.ncpu 2>/dev/null)
+	fi
+
+	# fallback to python2.6+
+	# note: this may fail (raise NotImplementedError)
+	if [[ -z ${nproc} ]] && type -P python &>/dev/null; then
+		nproc=$(python -c 'import multiprocessing; print(multiprocessing.cpu_count());' 2>/dev/null)
+	fi
+
+	if [[ -n ${nproc} ]]; then
+		echo "${nproc}"
+	else
+		echo "${1:-1}"
+	fi
+}
+
+# @FUNCTION: makeopts_jobs
+# @USAGE: [${MAKEOPTS}] [${inf:-999}]
+# @DESCRIPTION:
+# Searches the arguments (defaults to ${MAKEOPTS}) and extracts the jobs number
+# specified therein.  Useful for running non-make tools in parallel too.
+# i.e. if the user has MAKEOPTS=-j9, this will echo "9" -- we can't return the
+# number as bash normalizes it to [0, 255].  If the flags haven't specified a
+# -j flag, then "1" is shown as that is the default `make` uses.  Since there's
+# no way to represent infinity, we return ${inf} (defaults to 999) if the user
+# has -j without a number.
+makeopts_jobs() {
+	[[ $# -eq 0 ]] && set -- "${MAKEOPTS}"
+	# This assumes the first .* will be more greedy than the second .*
+	# since POSIX doesn't specify a non-greedy match (i.e. ".*?").
+	local jobs=$(echo " $* " | sed -r -n \
+		-e 's:.*[[:space:]](-[a-z]*j|--jobs[=[:space:]])[[:space:]]*([0-9]+).*:\2:p' \
+		-e "s:.*[[:space:]](-[a-z]*j|--jobs)[[:space:]].*:${2:-999}:p")
+	echo ${jobs:-1}
+}
+
+# @FUNCTION: makeopts_loadavg
+# @USAGE: [${MAKEOPTS}] [${inf:-999}]
+# @DESCRIPTION:
+# Searches the arguments (defaults to ${MAKEOPTS}) and extracts the value set
+# for load-average. For make and ninja based builds this will mean new jobs are
+# not only limited by the jobs-value, but also by the current load - which might
+# get excessive due to I/O and not just due to CPU load.
+# Be aware that the returned number might be a floating-point number. Test
+# whether your software supports that.
+# If no limit is specified or --load-average is used without a number, ${inf}
+# (defaults to 999) is returned.
+makeopts_loadavg() {
+	[[ $# -eq 0 ]] && set -- "${MAKEOPTS}"
+	# This assumes the first .* will be more greedy than the second .*
+	# since POSIX doesn't specify a non-greedy match (i.e. ".*?").
+	local lavg=$(echo " $* " | sed -r -n \
+		-e 's:.*[[:space:]](-[a-z]*l|--(load-average|max-load)[=[:space:]])[[:space:]]*([0-9]+(\.[0-9]+)?)[[:space:]].*:\3:p' \
+		-e "s:.*[[:space:]](-[a-z]*l|--(load-average|max-load))[[:space:]].*:${2:-999}:p")
+	# Default to ${inf} since the default is to not use a load limit.
+	echo ${lavg:-${2:-999}}
+}
+
+fi