#!/bin/bash# SPDX-License-Identifier: GPL-2.0 tenths=date\ +%s%1N # Wait for PID $1 to have $2 number of threads started# Time out after $3 tenths of a second or 5 seconds if $3 is ""wait_for_threads(){	tm_out=$3 ; [ -n "${tm_out}" ] || tm_out=50	start_time=$($tenths)	while [ -e "/proc/$1/task" ] ; do		th_cnt=$(find "/proc/$1/task" -mindepth 1 -maxdepth 1 -printf x | wc -c)		if [ "${th_cnt}" -ge "$2" ] ; then			return 0		fi		# Wait at most tm_out tenths of a second		if [ $(($($tenths) - start_time)) -ge $tm_out ] ; then			echo "PID $1 does not have $2 threads"			return 1		fi	done	return 1} # Wait for perf record -vvv 2>$2 with PID $1 to start by looking at file $2# It depends on capturing perf record debug message "perf record has started"# Time out after $3 tenths of a second or 5 seconds if $3 is ""wait_for_perf_to_start(){	tm_out=$3 ; [ -n "${tm_out}" ] || tm_out=50	echo "Waiting for \"perf record has started\" message"	start_time=$($tenths)	while [ -e "/proc/$1" ] ; do		if grep -q "perf record has started" "$2" ; then			echo OK			break		fi		# Wait at most tm_out tenths of a second		if [ $(($($tenths) - start_time)) -ge $tm_out ] ; then			echo "perf recording did not start"			return 1		fi	done	return 0} # Wait for process PID %1 to exit# Time out after $2 tenths of a second or 5 seconds if $2 is ""wait_for_process_to_exit(){	tm_out=$2 ; [ -n "${tm_out}" ] || tm_out=50	start_time=$($tenths)	while [ -e "/proc/$1" ] ; do		# Wait at most tm_out tenths of a second		if [ $(($($tenths) - start_time)) -ge $tm_out ] ; then			echo "PID $1 did not exit as expected"			return 1		fi	done	return 0} # Check if PID $1 is still running after $2 tenths of a second# or 0.3 seconds if $2 is ""is_running(){	tm_out=$2 ; [ -n "${tm_out}" ] || tm_out=3	start_time=$($tenths)	while [ -e "/proc/$1" ] ; do		# Check for at least tm_out tenths of a second		if [ $(($($tenths) - start_time)) -gt $tm_out ] ; then			return 0		fi	done	echo "PID $1 exited prematurely"	return 1}