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Name	Size	Permission	Date
aes.h	1.05 KB	-rw-r--r--	2026-06-08 03:37
app.h	10.23 KB	-rw-r--r--	2026-06-08 03:37
assertions.h	2.84 KB	-rw-r--r--	2026-06-08 03:37
atomic.h	4.07 KB	-rw-r--r--	2026-06-08 03:37
backtrace.h	3.8 KB	-rw-r--r--	2026-06-08 03:37
base32.h	4.35 KB	-rw-r--r--	2026-06-08 03:37
base64.h	2.8 KB	-rw-r--r--	2026-06-08 03:37
bind9.h	830 B	-rw-r--r--	2026-06-08 03:37
boolean.h	594 B	-rw-r--r--	2026-06-08 03:37
buffer.h	25.65 KB	-rw-r--r--	2026-06-08 03:37
bufferlist.h	1.42 KB	-rw-r--r--	2026-06-08 03:37
cmocka.h	1.35 KB	-rw-r--r--	2026-06-08 03:37
commandline.h	1.67 KB	-rw-r--r--	2026-06-08 03:37
condition.h	1.44 KB	-rw-r--r--	2026-06-08 03:37
counter.h	1.88 KB	-rw-r--r--	2026-06-08 03:37
crc64.h	998 B	-rw-r--r--	2026-06-08 03:37
deprecated.h	623 B	-rw-r--r--	2026-06-08 03:37
dir.h	1.56 KB	-rw-r--r--	2026-06-08 03:37
endian.h	4.67 KB	-rw-r--r--	2026-06-08 03:37
entropy.h	10.13 KB	-rw-r--r--	2026-06-08 03:37
errno.h	659 B	-rw-r--r--	2026-06-08 03:37
errno2result.h	902 B	-rw-r--r--	2026-06-08 03:38
error.h	1.4 KB	-rw-r--r--	2026-06-08 03:37
event.h	2.98 KB	-rw-r--r--	2026-06-08 03:37
eventclass.h	1.35 KB	-rw-r--r--	2026-06-08 03:37
file.h	11.39 KB	-rw-r--r--	2026-06-08 03:37
formatcheck.h	893 B	-rw-r--r--	2026-06-08 03:37
fsaccess.h	7.27 KB	-rw-r--r--	2026-06-08 03:37
hash.h	7.48 KB	-rw-r--r--	2026-06-08 03:37
heap.h	5.14 KB	-rw-r--r--	2026-06-08 03:37
hex.h	2.74 KB	-rw-r--r--	2026-06-08 03:37
hmacmd5.h	1.75 KB	-rw-r--r--	2026-06-08 03:37
hmacsha.h	4.41 KB	-rw-r--r--	2026-06-08 03:37
ht.h	4.29 KB	-rw-r--r--	2026-06-08 03:37
httpd.h	2.26 KB	-rw-r--r--	2026-06-08 03:37
int.h	1.06 KB	-rw-r--r--	2026-06-08 03:37
interfaceiter.h	3.05 KB	-rw-r--r--	2026-06-08 03:37
iterated_hash.h	1.02 KB	-rw-r--r--	2026-06-08 03:37
json.h	1.42 KB	-rw-r--r--	2026-06-08 03:37
keyboard.h	989 B	-rw-r--r--	2026-06-08 03:37
lang.h	637 B	-rw-r--r--	2026-06-08 03:37
lex.h	9.54 KB	-rw-r--r--	2026-06-08 03:37
lfsr.h	2.89 KB	-rw-r--r--	2026-06-08 03:37
lib.h	1.04 KB	-rw-r--r--	2026-06-08 03:37
likely.h	818 B	-rw-r--r--	2026-06-08 03:37
list.h	5.62 KB	-rw-r--r--	2026-06-08 03:37
log.h	28.06 KB	-rw-r--r--	2026-06-08 03:37
magic.h	994 B	-rw-r--r--	2026-06-08 03:37
md5.h	2.32 KB	-rw-r--r--	2026-06-08 03:37
mem.h	20.62 KB	-rw-r--r--	2026-06-08 03:37
meminfo.h	710 B	-rw-r--r--	2026-06-08 03:37
msgcat.h	2.66 KB	-rw-r--r--	2026-06-08 03:37
msgs.h	8.22 KB	-rw-r--r--	2026-06-08 03:37
mutex.h	3.44 KB	-rw-r--r--	2026-06-08 03:37
mutexblock.h	1.34 KB	-rw-r--r--	2026-06-08 03:37
net.h	10.29 KB	-rw-r--r--	2026-06-08 03:37
netaddr.h	4.48 KB	-rw-r--r--	2026-06-08 03:37
netdb.h	863 B	-rw-r--r--	2026-06-08 03:37
netscope.h	967 B	-rw-r--r--	2026-06-08 03:37
offset.h	700 B	-rw-r--r--	2026-06-08 03:37
once.h	983 B	-rw-r--r--	2026-06-08 03:37
ondestroy.h	2.73 KB	-rw-r--r--	2026-06-08 03:37
os.h	671 B	-rw-r--r--	2026-06-08 03:37
parseint.h	1.51 KB	-rw-r--r--	2026-06-08 03:37
platform.h	9.49 KB	-rw-r--r--	2026-06-08 03:37
pool.h	3.42 KB	-rw-r--r--	2026-06-08 03:37
portset.h	3.22 KB	-rw-r--r--	2026-06-08 03:37
print.h	2.42 KB	-rw-r--r--	2026-06-08 03:37
queue.h	5.08 KB	-rw-r--r--	2026-06-08 03:37
quota.h	2.38 KB	-rw-r--r--	2026-06-08 03:37
radix.h	6.34 KB	-rw-r--r--	2026-06-08 03:37
random.h	3.5 KB	-rw-r--r--	2026-06-08 03:37
ratelimiter.h	3.42 KB	-rw-r--r--	2026-06-08 03:37
refcount.h	8 KB	-rw-r--r--	2026-06-08 03:37
regex.h	767 B	-rw-r--r--	2026-06-08 03:37
region.h	1.99 KB	-rw-r--r--	2026-06-08 03:37
resource.h	2.79 KB	-rw-r--r--	2026-06-08 03:37
result.h	4.87 KB	-rw-r--r--	2026-06-08 03:37
resultclass.h	1.56 KB	-rw-r--r--	2026-06-08 03:37
rwlock.h	3.72 KB	-rw-r--r--	2026-06-08 03:37
safe.h	1.32 KB	-rw-r--r--	2026-06-08 03:37
serial.h	1.34 KB	-rw-r--r--	2026-06-08 03:37
sha1.h	1.52 KB	-rw-r--r--	2026-06-08 03:37
sha2.h	5.6 KB	-rw-r--r--	2026-06-08 03:37
siphash.h	734 B	-rw-r--r--	2026-06-08 03:37
sockaddr.h	5.9 KB	-rw-r--r--	2026-06-08 03:37
socket.h	35.8 KB	-rw-r--r--	2026-06-08 03:37
stat.h	806 B	-rw-r--r--	2026-06-08 03:37
stats.h	3.62 KB	-rw-r--r--	2026-06-08 03:37
stdatomic.h	5.13 KB	-rw-r--r--	2026-06-08 03:37
stdio.h	1.75 KB	-rw-r--r--	2026-06-08 03:37
stdlib.h	704 B	-rw-r--r--	2026-06-08 03:37
stdtime.h	1.04 KB	-rw-r--r--	2026-06-08 03:37
strerror.h	777 B	-rw-r--r--	2026-06-08 03:37
string.h	5.88 KB	-rw-r--r--	2026-06-08 03:37
symtab.h	4.22 KB	-rw-r--r--	2026-06-08 03:37
syslog.h	844 B	-rw-r--r--	2026-06-08 03:37
task.h	21.04 KB	-rw-r--r--	2026-06-08 03:37
taskpool.h	3.62 KB	-rw-r--r--	2026-06-08 03:37
thread.h	1.47 KB	-rw-r--r--	2026-06-08 03:37
time.h	8.67 KB	-rw-r--r--	2026-06-08 03:37
timer.h	10.54 KB	-rw-r--r--	2026-06-08 03:37
tm.h	895 B	-rw-r--r--	2026-06-08 03:37
types.h	5.64 KB	-rw-r--r--	2026-06-08 03:37
utf8.h	928 B	-rw-r--r--	2026-06-08 03:37
util.h	10.29 KB	-rw-r--r--	2026-06-08 03:37
version.h	689 B	-rw-r--r--	2026-06-08 03:37
xml.h	1.07 KB	-rw-r--r--	2026-06-08 03:37

Rename

/*
 * 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 <inttypes.h>

/*! \file isc/rwlock.h */

#include <isc/condition.h>
#include <isc/lang.h>
#include <isc/platform.h>
#include <isc/types.h>

#if defined(ISC_PLATFORM_HAVESTDATOMIC)
#if defined(__cplusplus)
#include <isc/stdatomic.h>
#else
#include <stdatomic.h>
#endif
#endif

ISC_LANG_BEGINDECLS

typedef enum {
	isc_rwlocktype_none = 0,
	isc_rwlocktype_read,
	isc_rwlocktype_write
} isc_rwlocktype_t;

#ifdef ISC_PLATFORM_USETHREADS
# if defined(ISC_PLATFORM_HAVESTDATOMIC)
#  define ISC_RWLOCK_USEATOMIC 1
#  define ISC_RWLOCK_USESTDATOMIC 1
# else /* defined(ISC_PLATFORM_HAVESTDATOMIC) */
#  if defined(ISC_PLATFORM_HAVEXADD) && defined(ISC_PLATFORM_HAVECMPXCHG)
#   define ISC_RWLOCK_USEATOMIC 1
#  endif
# endif /* defined(ISC_PLATFORM_HAVESTDATOMIC) */

struct isc_rwlock {
	/* Unlocked. */
	unsigned int		magic;
	isc_mutex_t		lock;

#if defined(ISC_RWLOCK_USEATOMIC)
	/*
	 * 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. */
#if defined(ISC_RWLOCK_USESTDATOMIC)
	atomic_int_fast32_t	spins;
	atomic_int_fast32_t	write_requests;
	atomic_int_fast32_t	write_completions;
	atomic_int_fast32_t	cnt_and_flag;
	atomic_int_fast32_t	write_granted;
#else
	int32_t		spins;
	int32_t		write_requests;
	int32_t		write_completions;
	int32_t		cnt_and_flag;
	int32_t		write_granted;
#endif

/* Locked by lock. */
	isc_condition_t		readable;
	isc_condition_t		writeable;
	unsigned int		readers_waiting;

/* Unlocked. */
	unsigned int		write_quota;

#else  /* ISC_RWLOCK_USEATOMIC */

/*%< Locked by lock. */
	isc_condition_t		readable;
	isc_condition_t		writeable;
	isc_rwlocktype_t	type;

/*% The number of threads that have the lock. */
	unsigned int		active;

/*%
	 * The number of lock grants made since the lock was last switched
	 * from reading to writing or vice versa; used in determining
	 * when the quota is reached and it is time to switch.
	 */
	unsigned int		granted;

unsigned int		spins;
	unsigned int		readers_waiting;
	unsigned int		writers_waiting;
	unsigned int		read_quota;
	unsigned int		write_quota;
	isc_rwlocktype_t	original;
#endif  /* ISC_RWLOCK_USEATOMIC */
};
#else /* ISC_PLATFORM_USETHREADS */
struct isc_rwlock {
	unsigned int		magic;
	isc_rwlocktype_t	type;
	unsigned int		active;
};
#endif /* ISC_PLATFORM_USETHREADS */

isc_result_t
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 */