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ca6ba70092
struct list is a common name and can't be used in public headers. Signed-off-by: Thomas Graf <tgraf@noironetworks.com> Acked-by: Ben Pfaff <blp@nicira.com>
50 lines
1.7 KiB
C
50 lines
1.7 KiB
C
/*
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* Copyright (c) 2013, 2014 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 FAT_RWLOCK_H
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#define FAT_RWLOCK_H 1
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#include "compiler.h"
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#include "list.h"
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#include "ovs-thread.h"
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/* "Fat rwlock".
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*
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* This implements a reader-writer lock that uses a lot of memory (128 to 192
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* bytes per thread that takes the lock) but avoids cache line bouncing when
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* taking the read side. Thus, a fat_rwlock is a good choice for rwlocks taken
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* frequently by readers.
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*/
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struct OVS_LOCKABLE fat_rwlock {
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ovsthread_key_t key;
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/* Contains "struct fat_rwlock_slot"s, one for each thread that has taken
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* this lock. Guarded by 'mutex'. */
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struct ovs_list threads OVS_GUARDED;
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struct ovs_mutex mutex;
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};
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void fat_rwlock_init(struct fat_rwlock *);
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void fat_rwlock_destroy(struct fat_rwlock *);
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void fat_rwlock_rdlock(const struct fat_rwlock *rwlock) OVS_ACQ_RDLOCK(rwlock);
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int fat_rwlock_tryrdlock(const struct fat_rwlock *rwlock)
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OVS_TRY_RDLOCK(0, rwlock);
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void fat_rwlock_wrlock(const struct fat_rwlock *rwlock) OVS_ACQ_WRLOCK(rwlock);
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void fat_rwlock_unlock(const struct fat_rwlock *rwlock) OVS_RELEASES(rwlock);
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#endif /* fat-rwlock.h */
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