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# Copyright (c) 2017 The NetBSD Foundation, Inc.
# All rights reserved.
#
# This code is derived from software contributed to The NetBSD Foundation
# by Johnny C. Lam.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
task_load createfile
task_load lock
task_load unittest
test_setup()
{
: ${CAT:=cat}
: ${CMP:=cmp}
: ${SLEEP:=sleep}
lockfile="lock"
}
test1()
{
describe="create lock"
if task_lock "$lockfile"; then
: "success"
else
return 1
fi
if [ ! -f "$lockfile" ]; then
describe="$describe: $lockfile missing!"
return 1
fi
return 0
}
test2()
{
describe="create nonblocking lock, pre-existing lock file"
task_createfile "$lockfile"
if task_lock -n "$lockfile"; then
return 1
fi
return 0
}
test3()
{
describe="release lock"
task_lock "$lockfile"
if task_lock -r "$lockfile"; then
: "success"
else
return 1
fi
if [ -f "$lockfile" ]; then
describe="$describe: $lockfile exists!"
return 1
fi
return 0
}
test4()
{
describe="create lock, competing processes"
local timeout=3
# Create a child process that writes to "value".
( if task_lock "$lockfile"; then
echo "child" >> value
${SLEEP} $timeout
task_lock -r "$lockfile"
fi ) &
#
# Wait for up to $timeout seconds for the child to write to the
# datefile.
#
while [ $timeout -gt 0 ]; do
[ ! -f value ] || break
${SLEEP} 1
timeout=$(( $timeout - 1 ))
done
# Block waiting for background process to unlock.
if task_lock "$lockfile"; then
echo "parent" >> value
task_lock -r "$lockfile"
fi
# Check that the writes were serialized: child, then parent.
${CAT} > expected << 'EOF'
child
parent
EOF
if ${CMP} -s expected value; then
: "success"
else
describe="$describe: child after parent!"
return 1
fi
return 0
}
task_run_tests "$@"
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