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https://github.com/openvswitch/ovs
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44e0c35d98
Separate rule versioning to lib/versions.h to make it easier to use versioning for other data types. Signed-off-by: Jarno Rajahalme <jarno@ovn.org> Acked-by: Ben Pfaff <blp@ovn.org>
75 lines
2.4 KiB
C
75 lines
2.4 KiB
C
/*
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* Copyright (c) 2016 Nicira, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef VERSIONS_H
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#define VERSIONS_H 1
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#include "ovs-atomic.h"
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#include "openvswitch/type-props.h"
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typedef uint64_t ovs_version_t;
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#define OVS_VERSION_MIN 0 /* Default version number to use. */
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#define OVS_VERSION_MAX (TYPE_MAXIMUM(ovs_version_t) - 1)
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#define OVS_VERSION_NOT_REMOVED TYPE_MAXIMUM(ovs_version_t)
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/*
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* OVS_VERSION_NOT_REMOVED has a special meaning for 'remove_version',
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* meaning that the rule has been added but not yet removed.
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*/
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struct versions {
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ovs_version_t add_version; /* Version object was added in. */
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ATOMIC(ovs_version_t) remove_version; /* Version object is removed in. */
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};
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#define VERSIONS_INITIALIZER(ADD, REMOVE) \
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(struct versions){ ADD, ATOMIC_VAR_INIT(REMOVE) }
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static inline void
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versions_set_remove_version(struct versions *versions, ovs_version_t version)
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{
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atomic_store_relaxed(&versions->remove_version, version);
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}
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static inline bool
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versions_visible_in_version(const struct versions *versions,
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ovs_version_t version)
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{
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ovs_version_t remove_version;
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/* C11 does not want to access an atomic via a const object pointer. */
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atomic_read_relaxed(&CONST_CAST(struct versions *,
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versions)->remove_version,
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&remove_version);
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return versions->add_version <= version && version < remove_version;
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}
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static inline bool
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versions_is_eventually_invisible(const struct versions *versions)
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{
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ovs_version_t remove_version;
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/* C11 does not want to access an atomic via a const object pointer. */
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atomic_read_relaxed(&CONST_CAST(struct versions *,
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versions)->remove_version,
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&remove_version);
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return remove_version < OVS_VERSION_NOT_REMOVED;
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}
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#endif /* VERSIONS_H */
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