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Name	Size	Permission
aes.h	1015 B	-rw-r--r--
align.h	569 B	-rw-r--r--
app.h	6.97 KB	-rw-r--r--
assertions.h	2.17 KB	-rw-r--r--
astack.h	1.11 KB	-rw-r--r--
atomic.h	3.01 KB	-rw-r--r--
backtrace.h	3.8 KB	-rw-r--r--
barrier.h	1.03 KB	-rw-r--r--
base32.h	4.35 KB	-rw-r--r--
base64.h	2.8 KB	-rw-r--r--
bind9.h	829 B	-rw-r--r--
buffer.h	29.91 KB	-rw-r--r--
bufferlist.h	1.42 KB	-rw-r--r--
cmocka.h	1.35 KB	-rw-r--r--
commandline.h	1.67 KB	-rw-r--r--
condition.h	1.87 KB	-rw-r--r--
counter.h	1.88 KB	-rw-r--r--
crc64.h	998 B	-rw-r--r--
deprecated.h	662 B	-rw-r--r--
dir.h	1.51 KB	-rw-r--r--
endian.h	4.75 KB	-rw-r--r--
errno.h	659 B	-rw-r--r--
errno2result.h	901 B	-rw-r--r--
error.h	1.4 KB	-rw-r--r--
event.h	3.36 KB	-rw-r--r--
eventclass.h	1.41 KB	-rw-r--r--
file.h	11.4 KB	-rw-r--r--
formatcheck.h	940 B	-rw-r--r--
fsaccess.h	7.28 KB	-rw-r--r--
fuzz.h	593 B	-rw-r--r--
hash.h	1.61 KB	-rw-r--r--
heap.h	5.14 KB	-rw-r--r--
hex.h	2.74 KB	-rw-r--r--
hmac.h	3.88 KB	-rw-r--r--
hp.h	4.48 KB	-rw-r--r--
ht.h	4.38 KB	-rw-r--r--
httpd.h	2.24 KB	-rw-r--r--
interfaceiter.h	3.07 KB	-rw-r--r--
iterated_hash.h	933 B	-rw-r--r--
lang.h	686 B	-rw-r--r--
lex.h	9.77 KB	-rw-r--r--
lfsr.h	2.89 KB	-rw-r--r--
lib.h	1.13 KB	-rw-r--r--
likely.h	868 B	-rw-r--r--
list.h	7.9 KB	-rw-r--r--
log.h	25.88 KB	-rw-r--r--
magic.h	999 B	-rw-r--r--
managers.h	776 B	-rw-r--r--
md.h	5.63 KB	-rw-r--r--
mem.h	17.66 KB	-rw-r--r--
meminfo.h	710 B	-rw-r--r--
mutex.h	4.08 KB	-rw-r--r--
mutexatomic.h	9.56 KB	-rw-r--r--
mutexblock.h	1.13 KB	-rw-r--r--
net.h	8.36 KB	-rw-r--r--
netaddr.h	4.67 KB	-rw-r--r--
netdb.h	860 B	-rw-r--r--
netmgr.h	15.36 KB	-rw-r--r--
netscope.h	966 B	-rw-r--r--
nonce.h	743 B	-rw-r--r--
offset.h	687 B	-rw-r--r--
once.h	767 B	-rw-r--r--
os.h	765 B	-rw-r--r--
parseint.h	1.5 KB	-rw-r--r--
platform.h	1.82 KB	-rw-r--r--
pool.h	3.41 KB	-rw-r--r--
portset.h	3.22 KB	-rw-r--r--
print.h	680 B	-rw-r--r--
queue.h	1.31 KB	-rw-r--r--
quota.h	3.48 KB	-rw-r--r--
radix.h	6.85 KB	-rw-r--r--
random.h	1.45 KB	-rw-r--r--
ratelimiter.h	3.41 KB	-rw-r--r--
refcount.h	4.98 KB	-rw-r--r--
regex.h	767 B	-rw-r--r--
region.h	2.18 KB	-rw-r--r--
resource.h	2.79 KB	-rw-r--r--
result.h	5.45 KB	-rw-r--r--
resultclass.h	1.56 KB	-rw-r--r--
rwlock.h	2.48 KB	-rw-r--r--
safe.h	1.12 KB	-rw-r--r--
serial.h	1.33 KB	-rw-r--r--
siphash.h	916 B	-rw-r--r--
sockaddr.h	6.13 KB	-rw-r--r--
socket.h	23.55 KB	-rw-r--r--
stat.h	803 B	-rw-r--r--
stats.h	6.53 KB	-rw-r--r--
stdatomic.h	8.9 KB	-rw-r--r--
stdio.h	1.69 KB	-rw-r--r--
stdtime.h	1.36 KB	-rw-r--r--
strerr.h	575 B	-rw-r--r--
string.h	851 B	-rw-r--r--
symtab.h	4.22 KB	-rw-r--r--
syslog.h	843 B	-rw-r--r--
task.h	16.72 KB	-rw-r--r--
taskpool.h	3.2 KB	-rw-r--r--
thread.h	1.86 KB	-rw-r--r--
time.h	10.85 KB	-rw-r--r--
timer.h	7.77 KB	-rw-r--r--
tm.h	894 B	-rw-r--r--
types.h	5.72 KB	-rw-r--r--
url.h	2.62 KB	-rw-r--r--
utf8.h	928 B	-rw-r--r--
util.h	13.96 KB	-rw-r--r--
version.h	499 B	-rw-r--r--

Code Editor : refcount.h

/*
 * 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.
 */

#pragma once

#include <inttypes.h>

#include <isc/assertions.h>
#include <isc/atomic.h>
#include <isc/error.h>
#include <isc/lang.h>
#include <isc/mutex.h>
#include <isc/platform.h>
#include <isc/types.h>

/*! \file isc/refcount.h
 * \brief Implements a locked reference counter.
 *
 * These macros uses C11(-like) atomic functions to implement reference
 * counting.  The isc_refcount_t type must not be accessed directly.
 */

ISC_LANG_BEGINDECLS

typedef atomic_uint_fast32_t isc_refcount_t;

/** \def isc_refcount_init(ref, n)
 *  \brief Initialize the reference counter.
 *  \param[in] ref pointer to reference counter.
 *  \param[in] n an initial number of references.
 *  \return nothing.
 *
 *  \warning No memory barrier are being imposed here.
 */
#define isc_refcount_init(target, value) atomic_init(target, value)

/** \def isc_refcount_current(ref)
 *  \brief Returns current number of references.
 *  \param[in] ref pointer to reference counter.
 *  \returns current value of reference counter.
 *
 *   Undo implicit promotion to 64 bits in our Windows implementation of
 *   atomic_load_explicit() by casting to uint_fast32_t.
 */

#define isc_refcount_current(target) (uint_fast32_t) atomic_load_acquire(target)

/** \def isc_refcount_destroy(ref)
 *  \brief a destructor that makes sure that all references were cleared.
 *  \param[in] ref pointer to reference counter.
 *  \returns nothing.
 */
#define isc_refcount_destroy(target) \
	ISC_REQUIRE(isc_refcount_current(target) == 0)

/** \def isc_refcount_increment0(ref)
 *  \brief increases reference counter by 1.
 *  \param[in] ref pointer to reference counter.
 *  \returns previous value of reference counter.
 */
#if _MSC_VER
static inline uint_fast32_t
isc_refcount_increment0(isc_refcount_t *target) {
	uint_fast32_t __v;
	__v = (uint_fast32_t)atomic_fetch_add_relaxed(target, 1);
	INSIST(__v < UINT32_MAX);
	return (__v);
}
#else /* _MSC_VER */
#define isc_refcount_increment0(target)                    \
	({                                                 \
		/* cppcheck-suppress shadowVariable */     \
		uint_fast32_t __v;                         \
		__v = atomic_fetch_add_relaxed(target, 1); \
		INSIST(__v < UINT32_MAX);                  \
		__v;                                       \
	})
#endif /* _MSC_VER */

/** \def isc_refcount_increment(ref)
 *  \brief increases reference counter by 1.
 *  \param[in] ref pointer to reference counter.
 *  \returns previous value of reference counter.
 */
#if _MSC_VER
static inline uint_fast32_t
isc_refcount_increment(isc_refcount_t *target) {
	uint_fast32_t __v;
	__v = (uint_fast32_t)atomic_fetch_add_relaxed(target, 1);
	INSIST(__v > 0 && __v < UINT32_MAX);
	return (__v);
}
#else /* _MSC_VER */
#define isc_refcount_increment(target)                     \
	({                                                 \
		/* cppcheck-suppress shadowVariable */     \
		uint_fast32_t __v;                         \
		__v = atomic_fetch_add_relaxed(target, 1); \
		INSIST(__v > 0 && __v < UINT32_MAX);       \
		__v;                                       \
	})
#endif /* _MSC_VER */

/** \def isc_refcount_decrement(ref)
 *  \brief decreases reference counter by 1.
 *  \param[in] ref pointer to reference counter.
 *  \returns previous value of reference counter.
 */
#if _MSC_VER
static inline uint_fast32_t
isc_refcount_decrement(isc_refcount_t *target) {
	uint_fast32_t __v;
	__v = (uint_fast32_t)atomic_fetch_sub_acq_rel(target, 1);
	INSIST(__v > 0);
	return (__v);
}
#else /* _MSC_VER */
#define isc_refcount_decrement(target)                     \
	({                                                 \
		/* cppcheck-suppress shadowVariable */     \
		uint_fast32_t __v;                         \
		__v = atomic_fetch_sub_acq_rel(target, 1); \
		INSIST(__v > 0);                           \
		__v;                                       \
	})
#endif /* _MSC_VER */

#define isc_refcount_decrementz(target)                               \
	do {                                                          \
		uint_fast32_t _refs = isc_refcount_decrement(target); \
		ISC_INSIST(_refs == 1);                               \
	} while (0)

#define isc_refcount_decrement1(target)                               \
	do {                                                          \
		uint_fast32_t _refs = isc_refcount_decrement(target); \
		ISC_INSIST(_refs > 1);                                \
	} while (0)

#define isc_refcount_decrement0(target)                               \
	do {                                                          \
		uint_fast32_t _refs = isc_refcount_decrement(target); \
		ISC_INSIST(_refs > 0);                                \
	} while (0)

ISC_LANG_ENDDECLS

${this.title}

Code Editor : refcount.h