linux_kernel/tools/testing/selftests/ftrace/test.d/instances/instance.tc

#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# description: Test creation and deletion of trace instances

if [ ! -d instances ] ; then
    echo "no instance directory with this kernel"
    exit_unsupported;
fi

fail() { # mesg
    rmdir x y z 2>/dev/null
    echo $1
    set -e
    exit_fail
}

cd instances

# we don't want to fail on error
set +e

mkdir x
rmdir x
result=$?

if [ $result -ne 0 ]; then
    echo "instance rmdir not supported"
    exit_unsupported
fi

instance_slam() {
    while :; do
	mkdir x
	mkdir y
	mkdir z
	rmdir x
	rmdir y
	rmdir z
    done 2>/dev/null
}

instance_slam &
p1=$!
echo $p1

instance_slam &
p2=$!
echo $p2

instance_slam &
p3=$!
echo $p3

instance_slam &
p4=$!
echo $p4

instance_slam &
p5=$!
echo $p5

ls -lR >/dev/null
sleep 1

kill -1 $p1
kill -1 $p2
kill -1 $p3
kill -1 $p4
kill -1 $p5

echo "Wait for processes to finish"
wait $p1 $p2 $p3 $p4 $p5
echo "all processes finished, wait for cleanup"

mkdir x y z
ls x y z
rmdir x y z
for d in x y z; do
        if [ -d $d ]; then
                fail "instance $d still exists"
        fi
done

set -e

exit 0