0 #laji?u@?p bѿ l /* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, you can obtain one at https://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. */ #ifndef ISC_RWLOCK_H #define ISC_RWLOCK_H 1 #include /*! \file isc/rwlock.h */ #include #include #include #include #include ISC_LANG_BEGINDECLS typedef enum { isc_rwlocktype_none = 0, isc_rwlocktype_read, isc_rwlocktype_write } isc_rwlocktype_t; #if USE_PTHREAD_RWLOCK #include struct isc_rwlock { pthread_rwlock_t rwlock; atomic_bool downgrade; }; #else /* USE_PTHREAD_RWLOCK */ struct isc_rwlock { /* Unlocked. */ unsigned int magic; isc_mutex_t lock; atomic_int_fast32_t spins; /* * When some atomic instructions with hardware assistance are * available, rwlock will use those so that concurrent readers do not * interfere with each other through mutex as long as no writers * appear, massively reducing the lock overhead in the typical case. * * The basic algorithm of this approach is the "simple * writer-preference lock" shown in the following URL: * http://www.cs.rochester.edu/u/scott/synchronization/pseudocode/rw.html * but our implementation does not rely on the spin lock unlike the * original algorithm to be more portable as a user space application. */ /* Read or modified atomically. */ atomic_int_fast32_t write_requests; atomic_int_fast32_t write_completions; atomic_int_fast32_t cnt_and_flag; /* Locked by lock. */ isc_condition_t readable; isc_condition_t writeable; unsigned int readers_waiting; /* Locked by rwlock itself. */ atomic_uint_fast32_t write_granted; /* Unlocked. */ unsigned int write_quota; }; #endif /* USE_PTHREAD_RWLOCK */ void isc_rwlock_init(isc_rwlock_t *rwl, unsigned int read_quota, unsigned int write_quota); isc_result_t isc_rwlock_lock(isc_rwlock_t *rwl, isc_rwlocktype_t type); isc_result_t isc_rwlock_trylock(isc_rwlock_t *rwl, isc_rwlocktype_t type); isc_result_t isc_rwlock_unlock(isc_rwlock_t *rwl, isc_rwlocktype_t type); isc_result_t isc_rwlock_tryupgrade(isc_rwlock_t *rwl); void isc_rwlock_downgrade(isc_rwlock_t *rwl); void isc_rwlock_destroy(isc_rwlock_t *rwl); ISC_LANG_ENDDECLS #endif /* ISC_RWLOCK_H */ ! 355a=JJj"Tܸ'ţc 404 Not Found

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