65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
/*
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* Copyright (C) 1998, 1999 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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#ifndef ISC_RWLOCK_H
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#define ISC_RWLOCK_H 1
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#include <isc/lang.h>
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#include <isc/result.h>
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#include <isc/mutex.h>
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#include <isc/condition.h>
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ISC_LANG_BEGINDECLS
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typedef enum {
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isc_rwlocktype_read = 0,
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isc_rwlocktype_write
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} isc_rwlocktype_t;
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typedef struct isc_rwlock {
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/* Unlocked. */
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unsigned int magic;
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isc_mutex_t lock;
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/* Locked by lock. */
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isc_condition_t readable;
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isc_condition_t writeable;
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isc_rwlocktype_t type;
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unsigned int active;
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unsigned int granted;
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unsigned int readers_waiting;
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unsigned int writers_waiting;
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unsigned int read_quota;
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unsigned int write_quota;
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} isc_rwlock_t;
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isc_result_t
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isc_rwlock_init(isc_rwlock_t *rwl, unsigned int read_quota,
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unsigned int write_quota);
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isc_result_t
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isc_rwlock_lock(isc_rwlock_t *rwl, isc_rwlocktype_t type);
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isc_result_t
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isc_rwlock_unlock(isc_rwlock_t *rwl, isc_rwlocktype_t type);
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void
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isc_rwlock_destroy(isc_rwlock_t *rwl);
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ISC_LANG_ENDDECLS
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#endif /* ISC_RWLOCK_H */
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