#acupoftea - mail.ontime-ae.com

System	:	Linux server1.ontime-gulf.com 4.18.0-553.5.1.el8_10.x86_64 #1 SMP Wed Jun 5 09:12:13 EDT 2024 x86_64
Software	:	Apache
Server	:	162.0.230.206
Domains	:	40 Domain
Permission	:	[ drwxr-xr-x ]
	:	/ usr / include / bind9 / isc /

216.73.216.49

Home

File 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.
 */

#ifndef ISC_REFCOUNT_H
#define ISC_REFCOUNT_H 1

#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>

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

/*! \file isc/refcount.h
 * \brief Implements a locked reference counter.
 *
 * These functions may actually be
 * implemented using macros, and implementations of these macros are below.
 * The isc_refcount_t type should not be accessed directly, as its contents
 * depend on the implementation.
 */

ISC_LANG_BEGINDECLS

/*
 * Function prototypes
 */

/*
 * isc_result_t
 * isc_refcount_init(isc_refcount_t *ref, unsigned int n);
 *
 * Initialize the reference counter.  There will be 'n' initial references.
 *
 * Requires:
 *	ref != NULL
 */

/*
 * void
 * isc_refcount_destroy(isc_refcount_t *ref);
 *
 * Destroys a reference counter.
 *
 * Requires:
 *	ref != NULL
 *	The number of references is 0.
 */

/*
 * void
 * isc_refcount_increment(isc_refcount_t *ref, unsigned int *targetp);
 * isc_refcount_increment0(isc_refcount_t *ref, unsigned int *targetp);
 *
 * Increments the reference count, returning the new value in targetp if it's
 * not NULL.  The reference counter typically begins with the initial counter
 * of 1, and will be destroyed once the counter reaches 0.  Thus,
 * isc_refcount_increment() additionally requires the previous counter be
 * larger than 0 so that an error which violates the usage can be easily
 * caught.  isc_refcount_increment0() does not have this restriction.
 *
 * Requires:
 *	ref != NULL.
 */

/*
 * void
 * isc_refcount_decrement(isc_refcount_t *ref, unsigned int *targetp);
 *
 * Decrements the reference count,  returning the new value in targetp if it's
 * not NULL.
 *
 * Requires:
 *	ref != NULL.
 */

/*
 * Sample implementations
 */
#ifdef ISC_PLATFORM_USETHREADS

#if defined(ISC_PLATFORM_HAVESTDATOMIC)
# define ISC_REFCOUNT_HAVEATOMIC 1
# define ISC_REFCOUNT_HAVESTDATOMIC 1
#else /* defined(ISC_PLATFORM_HAVESTDATOMIC) */
# if defined(ISC_PLATFORM_HAVEXADD)
#  define ISC_REFCOUNT_HAVEATOMIC 1
# endif /* defined(ISC_PLATFORM_HAVEXADD */
#endif /* !defined(ISC_REFCOUNT_HAVEATOMIC) */

#if defined(ISC_REFCOUNT_HAVEATOMIC)

typedef struct isc_refcount {
#if defined(ISC_REFCOUNT_HAVESTDATOMIC)
	atomic_int_fast32_t refs;
#else
	int32_t refs;
#endif
} isc_refcount_t;

#if defined(ISC_REFCOUNT_HAVESTDATOMIC)

#define isc_refcount_current(rp)					\
	((unsigned int)(atomic_load_explicit(&(rp)->refs,		\
					     memory_order_acquire)))
#define isc_refcount_destroy(rp) ISC_REQUIRE(isc_refcount_current(rp) == 0)

#define isc_refcount_increment0(rp, tp)				\
	do {							\
		unsigned int *_tmp = (unsigned int *)(tp);	\
		int32_t prev;				\
		prev = atomic_fetch_add_explicit		\
			(&(rp)->refs, 1, memory_order_relaxed); \
		if (_tmp != NULL)				\
			*_tmp = prev + 1;			\
	} while (0)

#define isc_refcount_increment(rp, tp)				\
	do {							\
		unsigned int *_tmp = (unsigned int *)(tp);	\
		int32_t prev;				\
		prev = atomic_fetch_add_explicit		\
			(&(rp)->refs, 1, memory_order_relaxed); \
		ISC_REQUIRE(prev > 0);				\
		if (_tmp != NULL)				\
			*_tmp = prev + 1;			\
	} while (0)

#define isc_refcount_decrement(rp, tp)				\
	do {							\
		unsigned int *_tmp = (unsigned int *)(tp);	\
		int32_t prev;				\
		prev = atomic_fetch_sub_explicit		\
			(&(rp)->refs, 1, memory_order_acq_rel); \
		ISC_REQUIRE(prev > 0);				\
		if (_tmp != NULL)				\
			*_tmp = prev - 1;			\
	} while (0)

#else /* defined(ISC_REFCOUNT_HAVESTDATOMIC) */

#define isc_refcount_current(rp)				\
	((unsigned int)(isc_atomic_xadd(&(rp)->refs, 0)))
#define isc_refcount_destroy(rp) ISC_REQUIRE(isc_refcount_current(rp) == 0)

#define isc_refcount_increment0(rp, tp)				\
	do {							\
		unsigned int *_tmp = (unsigned int *)(tp);	\
		int32_t prev;				\
		prev = isc_atomic_xadd(&(rp)->refs, 1);		\
		if (_tmp != NULL)				\
			*_tmp = prev + 1;			\
	} while (0)

#define isc_refcount_increment(rp, tp)				\
	do {							\
		unsigned int *_tmp = (unsigned int *)(tp);	\
		int32_t prev;				\
		prev = isc_atomic_xadd(&(rp)->refs, 1);		\
		ISC_REQUIRE(prev > 0);				\
		if (_tmp != NULL)				\
			*_tmp = prev + 1;			\
	} while (0)

#define isc_refcount_decrement(rp, tp)				\
	do {							\
		unsigned int *_tmp = (unsigned int *)(tp);	\
		int32_t prev;				\
		prev = isc_atomic_xadd(&(rp)->refs, -1);	\
		ISC_REQUIRE(prev > 0);				\
		if (_tmp != NULL)				\
			*_tmp = prev - 1;			\
	} while (0)

#endif /* defined(ISC_REFCOUNT_HAVESTDATOMIC) */

#else /* defined(ISC_REFCOUNT_HAVEATOMIC) */

typedef struct isc_refcount {
	int refs;
	isc_mutex_t lock;
} isc_refcount_t;

/*% Destroys a reference counter. */
#define isc_refcount_destroy(rp)					\
	do {								\
		isc_result_t _result;					\
		ISC_REQUIRE((rp)->refs == 0);				\
		_result = isc_mutex_destroy(&(rp)->lock);		\
		ISC_ERROR_RUNTIMECHECK(_result == ISC_R_SUCCESS);	\
	} while (0)

unsigned int isc_refcount_current(isc_refcount_t *rp);

/*%
 * Increments the reference count, returning the new value in
 * 'tp' if it's not NULL.
 */
#define isc_refcount_increment0(rp, tp)					\
	do {								\
		isc_result_t _result;					\
		unsigned int *_tmp = (unsigned int *)(tp);		\
		_result = isc_mutex_lock(&(rp)->lock);			\
		ISC_ERROR_RUNTIMECHECK(_result == ISC_R_SUCCESS);	\
		++((rp)->refs);						\
		if (_tmp != NULL)					\
			*_tmp = ((rp)->refs);				\
		_result = isc_mutex_unlock(&(rp)->lock);		\
		ISC_ERROR_RUNTIMECHECK(_result == ISC_R_SUCCESS);	\
	} while (0)

#define isc_refcount_increment(rp, tp)					\
	do {								\
		isc_result_t _result;					\
		unsigned int *_tmp = (unsigned int *)(tp);		\
		_result = isc_mutex_lock(&(rp)->lock);			\
		ISC_ERROR_RUNTIMECHECK(_result == ISC_R_SUCCESS);	\
		ISC_REQUIRE((rp)->refs > 0);				\
		++((rp)->refs);						\
		if (_tmp != NULL)					\
			*_tmp = ((rp)->refs);				\
		_result = isc_mutex_unlock(&(rp)->lock);		\
		ISC_ERROR_RUNTIMECHECK(_result == ISC_R_SUCCESS);	\
	} while (0)

/*%
 * Decrements the reference count, returning the new value in 'tp'
 * if it's not NULL.
 */
#define isc_refcount_decrement(rp, tp)					\
	do {								\
		isc_result_t _result;					\
		unsigned int *_tmp = (unsigned int *)(tp);		\
		_result = isc_mutex_lock(&(rp)->lock);			\
		ISC_ERROR_RUNTIMECHECK(_result == ISC_R_SUCCESS);	\
		ISC_REQUIRE((rp)->refs > 0);				\
		--((rp)->refs);						\
		if (_tmp != NULL)					\
			*_tmp = ((rp)->refs);				\
		_result = isc_mutex_unlock(&(rp)->lock);		\
		ISC_ERROR_RUNTIMECHECK(_result == ISC_R_SUCCESS);	\
	} while (0)

#endif /* defined(ISC_REFCOUNT_ATOMIC) */

#else  /* ISC_PLATFORM_USETHREADS */

typedef struct isc_refcount {
	int refs;
} isc_refcount_t;

#define isc_refcount_destroy(rp) ISC_REQUIRE((rp)->refs == 0)
#define isc_refcount_current(rp) ((unsigned int)((rp)->refs))

#define isc_refcount_increment0(rp, tp)					\
	do {								\
		unsigned int *_tmp = (unsigned int *)(tp);		\
		int _n = ++(rp)->refs;					\
		if (_tmp != NULL)					\
			*_tmp = _n;					\
	} while (0)

#define isc_refcount_increment(rp, tp)					\
	do {								\
		unsigned int *_tmp = (unsigned int *)(tp);		\
		int _n;							\
		ISC_REQUIRE((rp)->refs > 0);				\
		_n = ++(rp)->refs;					\
		if (_tmp != NULL)					\
			*_tmp = _n;					\
	} while (0)

#define isc_refcount_decrement(rp, tp)					\
	do {								\
		unsigned int *_tmp = (unsigned int *)(tp);		\
		int _n;							\
		ISC_REQUIRE((rp)->refs > 0);				\
		_n = --(rp)->refs;					\
		if (_tmp != NULL)					\
			*_tmp = _n;					\
	} while (0)

#endif /* ISC_PLATFORM_USETHREADS */

isc_result_t
isc_refcount_init(isc_refcount_t *ref, unsigned int n);

ISC_LANG_ENDDECLS

#endif /* ISC_REFCOUNT_H */

Name	Type	Size	Permission	Last Modified	Actions
.	DIR	-	drwxr-xr-x	2025-02-21 10:57:15
..	DIR	-	drwxr-xr-x	2025-02-21 10:57:16
aes.h	text/x-c	1.05 KB	-rw-r--r--	2025-02-20 09:05:24
app.h	text/x-c	10.23 KB	-rw-r--r--	2025-02-20 09:05:24
assertions.h	text/x-c	2.84 KB	-rw-r--r--	2025-02-20 09:05:24
atomic.h	text/x-c	4.07 KB	-rw-r--r--	2025-02-20 09:05:24
backtrace.h	text/x-c	3.8 KB	-rw-r--r--	2025-02-20 09:05:24
base32.h	text/x-c	4.35 KB	-rw-r--r--	2025-02-20 09:05:24
base64.h	text/x-c	2.8 KB	-rw-r--r--	2025-02-20 09:05:24
bind9.h	text/x-c	830 B	-rw-r--r--	2025-02-20 09:05:24
boolean.h	text/plain	594 B	-rw-r--r--	2025-02-20 09:05:24
buffer.h	text/x-c	25.65 KB	-rw-r--r--	2025-02-20 09:05:24
bufferlist.h	text/x-c	1.42 KB	-rw-r--r--	2025-02-20 09:05:24
cmocka.h	text/x-c	1.35 KB	-rw-r--r--	2025-02-20 09:05:24
commandline.h	text/x-c	1.67 KB	-rw-r--r--	2025-02-20 09:05:24
condition.h	text/x-c	1.44 KB	-rw-r--r--	2025-02-20 09:05:24
counter.h	text/x-c	1.88 KB	-rw-r--r--	2025-02-20 09:05:24
crc64.h	text/x-c	998 B	-rw-r--r--	2025-02-20 09:05:24
deprecated.h	text/plain	623 B	-rw-r--r--	2025-02-20 09:05:24
dir.h	text/x-c	1.56 KB	-rw-r--r--	2025-02-20 09:05:24
endian.h	text/x-c	4.67 KB	-rw-r--r--	2025-02-20 09:05:24
entropy.h	text/x-c	10.13 KB	-rw-r--r--	2025-02-20 09:05:24
errno.h	text/x-c	659 B	-rw-r--r--	2025-02-20 09:05:24
errno2result.h	text/x-c	902 B	-rw-r--r--	2025-02-20 09:05:37
error.h	text/x-c	1.4 KB	-rw-r--r--	2025-02-20 09:05:24
event.h	text/x-c	2.98 KB	-rw-r--r--	2025-02-20 09:05:24
eventclass.h	text/plain	1.35 KB	-rw-r--r--	2025-02-20 09:05:24
file.h	text/x-c	11.39 KB	-rw-r--r--	2025-02-20 09:05:24
formatcheck.h	text/plain	893 B	-rw-r--r--	2025-02-20 09:05:24
fsaccess.h	text/x-c	7.27 KB	-rw-r--r--	2025-02-20 09:05:24
hash.h	text/x-c	7.48 KB	-rw-r--r--	2025-02-20 09:05:24
heap.h	text/x-c	5.14 KB	-rw-r--r--	2025-02-20 09:05:24
hex.h	text/x-c	2.74 KB	-rw-r--r--	2025-02-20 09:05:24
hmacmd5.h	text/x-c	1.75 KB	-rw-r--r--	2025-02-20 09:05:24
hmacsha.h	text/x-c	4.41 KB	-rw-r--r--	2025-02-20 09:05:24
ht.h	text/x-c	4.29 KB	-rw-r--r--	2025-02-20 09:05:24
httpd.h	text/x-c	2.26 KB	-rw-r--r--	2025-02-20 09:05:24
int.h	text/x-c	1.06 KB	-rw-r--r--	2025-02-20 09:05:24
interfaceiter.h	text/x-c	3.05 KB	-rw-r--r--	2025-02-20 09:05:24
iterated_hash.h	text/x-c	1.02 KB	-rw-r--r--	2025-02-20 09:05:24
json.h	text/x-c	1.42 KB	-rw-r--r--	2025-02-20 09:05:24
keyboard.h	text/x-c	989 B	-rw-r--r--	2025-02-20 09:05:24
lang.h	text/plain	637 B	-rw-r--r--	2025-02-20 09:05:24
lex.h	text/x-c	9.54 KB	-rw-r--r--	2025-02-20 09:05:24
lfsr.h	text/x-c	2.89 KB	-rw-r--r--	2025-02-20 09:05:24
lib.h	text/x-c	1.04 KB	-rw-r--r--	2025-02-20 09:05:24
likely.h	text/plain	818 B	-rw-r--r--	2025-02-20 09:05:24
list.h	text/x-c	5.62 KB	-rw-r--r--	2025-02-20 09:05:24
log.h	text/x-c	28.06 KB	-rw-r--r--	2025-02-20 09:05:24
magic.h	text/x-c	994 B	-rw-r--r--	2025-02-20 09:05:24
md5.h	text/x-c	2.32 KB	-rw-r--r--	2025-02-20 09:05:24
mem.h	text/x-c	20.62 KB	-rw-r--r--	2025-02-20 09:05:24
meminfo.h	text/x-c	710 B	-rw-r--r--	2025-02-20 09:05:24
msgcat.h	text/x-c	2.66 KB	-rw-r--r--	2025-02-20 09:05:24
msgs.h	text/x-c	8.22 KB	-rw-r--r--	2025-02-20 09:05:24
mutex.h	text/x-c	3.44 KB	-rw-r--r--	2025-02-20 09:05:24
mutexblock.h	text/x-c	1.34 KB	-rw-r--r--	2025-02-20 09:05:24
net.h	text/x-c	10.29 KB	-rw-r--r--	2025-02-20 09:05:24
netaddr.h	text/x-c	4.48 KB	-rw-r--r--	2025-02-20 09:05:24
netdb.h	text/x-c	863 B	-rw-r--r--	2025-02-20 09:05:24
netscope.h	text/x-c	967 B	-rw-r--r--	2025-02-20 09:05:24
offset.h	text/x-c	700 B	-rw-r--r--	2025-02-20 09:05:24
once.h	text/x-c	983 B	-rw-r--r--	2025-02-20 09:05:24
ondestroy.h	text/x-c	2.73 KB	-rw-r--r--	2025-02-20 09:05:24
os.h	text/x-c	671 B	-rw-r--r--	2025-02-20 09:05:24
parseint.h	text/x-c	1.51 KB	-rw-r--r--	2025-02-20 09:05:24
platform.h	text/x-c	9.49 KB	-rw-r--r--	2025-02-20 09:05:24
pool.h	text/x-c	3.42 KB	-rw-r--r--	2025-02-20 09:05:24
portset.h	text/x-c	3.22 KB	-rw-r--r--	2025-02-20 09:05:24
print.h	text/x-c	2.42 KB	-rw-r--r--	2025-02-20 09:05:24
queue.h	text/x-c	5.08 KB	-rw-r--r--	2025-02-20 09:05:24
quota.h	text/x-c	2.38 KB	-rw-r--r--	2025-02-20 09:05:24
radix.h	text/x-c	6.34 KB	-rw-r--r--	2025-02-20 09:05:24
random.h	text/x-c	3.5 KB	-rw-r--r--	2025-02-20 09:05:24
ratelimiter.h	text/x-c	3.42 KB	-rw-r--r--	2025-02-20 09:05:24
refcount.h	text/x-c	8 KB	-rw-r--r--	2025-02-20 09:05:24
regex.h	text/x-c	767 B	-rw-r--r--	2025-02-20 09:05:24
region.h	text/x-c	1.99 KB	-rw-r--r--	2025-02-20 09:05:24
resource.h	text/x-c	2.79 KB	-rw-r--r--	2025-02-20 09:05:24
result.h	text/x-c	4.87 KB	-rw-r--r--	2025-02-20 09:05:24
resultclass.h	text/plain	1.56 KB	-rw-r--r--	2025-02-20 09:05:24
rwlock.h	text/x-c	3.72 KB	-rw-r--r--	2025-02-20 09:05:24
safe.h	text/x-c	1.32 KB	-rw-r--r--	2025-02-20 09:05:24
serial.h	text/x-c	1.34 KB	-rw-r--r--	2025-02-20 09:05:24
sha1.h	text/x-c	1.52 KB	-rw-r--r--	2025-02-20 09:05:24
sha2.h	text/x-c	5.6 KB	-rw-r--r--	2025-02-20 09:05:24
siphash.h	text/x-c	734 B	-rw-r--r--	2025-02-20 09:05:24
sockaddr.h	text/x-c	5.9 KB	-rw-r--r--	2025-02-20 09:05:24
socket.h	text/x-c	35.8 KB	-rw-r--r--	2025-02-20 09:05:24
stat.h	text/x-c	806 B	-rw-r--r--	2025-02-20 09:05:24
stats.h	text/x-c	3.62 KB	-rw-r--r--	2025-02-20 09:05:24
stdatomic.h	text/plain	5.13 KB	-rw-r--r--	2025-02-20 09:05:24
stdio.h	text/x-c	1.75 KB	-rw-r--r--	2025-02-20 09:05:24
stdlib.h	text/x-c	704 B	-rw-r--r--	2025-02-20 09:05:24
stdtime.h	text/x-c	1.04 KB	-rw-r--r--	2025-02-20 09:05:24
strerror.h	text/x-c	777 B	-rw-r--r--	2025-02-20 09:05:24
string.h	text/x-c	5.88 KB	-rw-r--r--	2025-02-20 09:05:24
symtab.h	text/x-c	4.22 KB	-rw-r--r--	2025-02-20 09:05:24
syslog.h	text/x-c	844 B	-rw-r--r--	2025-02-20 09:05:24
task.h	text/x-c	21.04 KB	-rw-r--r--	2025-02-20 09:05:24
taskpool.h	text/x-c	3.62 KB	-rw-r--r--	2025-02-20 09:05:24
thread.h	text/x-c	1.47 KB	-rw-r--r--	2025-02-20 09:05:24
time.h	text/x-c	8.67 KB	-rw-r--r--	2025-02-20 09:05:24
timer.h	text/x-c	10.54 KB	-rw-r--r--	2025-02-20 09:05:24
tm.h	text/x-c	895 B	-rw-r--r--	2025-02-20 09:05:24
types.h	text/x-c	5.64 KB	-rw-r--r--	2025-02-20 09:05:24
utf8.h	text/x-c	928 B	-rw-r--r--	2025-02-20 09:05:24
util.h	text/x-c	10.29 KB	-rw-r--r--	2025-02-20 09:05:24
version.h	text/x-c	689 B	-rw-r--r--	2025-02-20 09:05:24
xml.h	text/x-c	1.07 KB	-rw-r--r--	2025-02-20 09:05:24

~ ACUPOFTEA - mail.ontime-ae.com