# 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.
#
# NAME
#	refcount.subr -- reference-count API
#
# SYNOPSIS
#	task_refcount exists database resource
#	task_refcount delete database resource
#	task_refcount add [-t token] database resource
#	task_refcount remove [-t token] database resource
#
#	task_refcount prop_exists database resource property
#	task_refcount prop_put database resource property [value ...]
#	task_refcount prop_match database resource property [value ...]
#	task_refcount prop_delete database resource property
#
# DESCRIPTION
#	task_refcount exists database resource
#		Checks whether there is a reference on the resource.
#
#	task_refcount delete database resource
#		Deletes any reference counts and properties on the
#		resource.
#
#	task_refcount add [-t token] database resource
#	task_refcount remove [-t token] database resource
#		Adds or removes a reference identified by token on the
#		resource.
#
#	task_refcount prop_exists database resource property
#		Checks whether a stored value exists for the property on
#		the resoure for the package.
#
#	task_refcount prop_delete database resource property
#		Removes the property on the resource for the package.
#
#	task_refcount prop_put database resource property [value ...]
#		Stores a value for the property on the resource for the
#		package.  If no value is given, then the default value for
#		the property is stored.
#
#	task_refcount prop_match database resource property [value ...]
#		Checks whether the stored value of the property on the
#		resource for the package matches the given value.  If no
#		value is given, then the default value for the property
#		is used.
#
# RETURN VALUES
#	The exists, prop_exists and prop_match commands return 0 on success,
#	and >0 otherwise.
#
#	The remaining commands return 0 on success, and >0 if an error
#	occurs.
#
# EXAMPLES
#     o Adding a reference count on resource alpha:
#
#	if task_refcount exists resource alpha; then
#		refcount_was_zero=
#	else
#		refcount_was_zero="yes"
#	fi
#	if task_refcount add resource alpha; then
#		if resource_exists alpha; then
#			if [ -n "$refcount_was_zero" ]; then
#				task_refcount prop_put resource alpha preexist
#			fi
#		else
#			# create resource alpha
#			...
#		fi
#	fi
#
#     o Removing a reference count on resource alpha:
#
#	if task_refcount remove resource alpha; then
#		if task_refcount exists resource alpha; then
#			: "refcount is not zero"
#		elif task_refcount prop_exists resource alpha preexist; then
#			: "resource was pre-existing; don't remove"
#		elif resource_exists alpha; then
#			# destroy resource alpha
#			...
#		fi
#	fi
#

__task_refcount__="yes"

task_load refcount_file

task_refcount()
{
	task_refcount_file "$@"
}