Gecko [ armaneco.co.uk ]

Name	Size	Permission	Date
aes.h	1.05 KB	-rw-r--r--	2025-03-04 13:53
app.h	10.23 KB	-rw-r--r--	2025-03-04 13:53
assertions.h	2.78 KB	-rw-r--r--	2025-03-04 13:53
atomic.h	4.15 KB	-rw-r--r--	2025-03-04 13:53
backtrace.h	3.8 KB	-rw-r--r--	2025-03-04 13:53
base32.h	3.94 KB	-rw-r--r--	2025-03-04 13:53
base64.h	2.39 KB	-rw-r--r--	2025-03-04 13:53
bind9.h	849 B	-rw-r--r--	2025-03-04 13:53
boolean.h	746 B	-rw-r--r--	2025-03-04 13:53
buffer.h	25.69 KB	-rw-r--r--	2025-03-04 13:53
bufferlist.h	1.42 KB	-rw-r--r--	2025-03-04 13:53
commandline.h	1.69 KB	-rw-r--r--	2025-03-04 13:53
condition.h	1.44 KB	-rw-r--r--	2025-03-04 13:53
counter.h	1.88 KB	-rw-r--r--	2025-03-04 13:53
crc64.h	986 B	-rw-r--r--	2025-03-04 13:53
deprecated.h	622 B	-rw-r--r--	2025-03-04 13:53
dir.h	1.96 KB	-rw-r--r--	2025-03-04 13:53
entropy.h	8.76 KB	-rw-r--r--	2025-03-04 13:53
errno.h	658 B	-rw-r--r--	2025-03-04 13:53
errno2result.h	893 B	-rw-r--r--	2025-03-04 13:53
error.h	1.4 KB	-rw-r--r--	2025-03-04 13:53
event.h	2.98 KB	-rw-r--r--	2025-03-04 13:53
eventclass.h	1.35 KB	-rw-r--r--	2025-03-04 13:53
file.h	11.43 KB	-rw-r--r--	2025-03-04 13:53
formatcheck.h	892 B	-rw-r--r--	2025-03-04 13:53
fsaccess.h	7.25 KB	-rw-r--r--	2025-03-04 13:53
hash.h	7.52 KB	-rw-r--r--	2025-03-04 13:53
heap.h	5.14 KB	-rw-r--r--	2025-03-04 13:53
hex.h	2.33 KB	-rw-r--r--	2025-03-04 13:53
hmacmd5.h	1.75 KB	-rw-r--r--	2025-03-04 13:53
hmacsha.h	4.44 KB	-rw-r--r--	2025-03-04 13:53
ht.h	4.29 KB	-rw-r--r--	2025-03-04 13:53
httpd.h	2.26 KB	-rw-r--r--	2025-03-04 13:53
int.h	1.37 KB	-rw-r--r--	2025-03-04 13:53
interfaceiter.h	3.03 KB	-rw-r--r--	2025-03-04 13:53
iterated_hash.h	1.02 KB	-rw-r--r--	2025-03-04 13:53
json.h	1.42 KB	-rw-r--r--	2025-03-04 13:53
keyboard.h	976 B	-rw-r--r--	2025-03-04 13:53
lang.h	636 B	-rw-r--r--	2025-03-04 13:53
lex.h	9.42 KB	-rw-r--r--	2025-03-04 13:53
lfsr.h	2.88 KB	-rw-r--r--	2025-03-04 13:53
lib.h	1.04 KB	-rw-r--r--	2025-03-04 13:53
likely.h	718 B	-rw-r--r--	2025-03-04 13:53
list.h	5.65 KB	-rw-r--r--	2025-03-04 13:53
log.h	28.06 KB	-rw-r--r--	2025-03-04 13:53
magic.h	993 B	-rw-r--r--	2025-03-04 13:53
md5.h	2.34 KB	-rw-r--r--	2025-03-04 13:53
mem.h	20.63 KB	-rw-r--r--	2025-03-04 13:53
meminfo.h	690 B	-rw-r--r--	2025-03-04 13:53
msgcat.h	2.66 KB	-rw-r--r--	2025-03-04 13:53
msgs.h	8.22 KB	-rw-r--r--	2025-03-04 13:53
mutex.h	3.44 KB	-rw-r--r--	2025-03-04 13:53
mutexblock.h	1.34 KB	-rw-r--r--	2025-03-04 13:53
net.h	10.32 KB	-rw-r--r--	2025-03-04 13:53
netaddr.h	4.56 KB	-rw-r--r--	2025-03-04 13:53
netdb.h	862 B	-rw-r--r--	2025-03-04 13:53
netscope.h	947 B	-rw-r--r--	2025-03-04 13:53
offset.h	699 B	-rw-r--r--	2025-03-04 13:53
once.h	981 B	-rw-r--r--	2025-03-04 13:53
ondestroy.h	2.79 KB	-rw-r--r--	2025-03-04 13:53
os.h	670 B	-rw-r--r--	2025-03-04 13:53
parseint.h	1.49 KB	-rw-r--r--	2025-03-04 13:53
platform.h	9.31 KB	-rw-r--r--	2025-03-04 13:53
pool.h	3.42 KB	-rw-r--r--	2025-03-04 13:53
portset.h	3.21 KB	-rw-r--r--	2025-03-04 13:53
print.h	2.49 KB	-rw-r--r--	2025-03-04 13:53
queue.h	4.66 KB	-rw-r--r--	2025-03-04 13:53
quota.h	2.29 KB	-rw-r--r--	2025-03-04 13:53
radix.h	6.37 KB	-rw-r--r--	2025-03-04 13:53
random.h	2.99 KB	-rw-r--r--	2025-03-04 13:53
ratelimiter.h	3.38 KB	-rw-r--r--	2025-03-04 13:53
refcount.h	7.89 KB	-rw-r--r--	2025-03-04 13:53
regex.h	766 B	-rw-r--r--	2025-03-04 13:53
region.h	1.99 KB	-rw-r--r--	2025-03-04 13:53
resource.h	2.8 KB	-rw-r--r--	2025-03-04 13:53
result.h	4.62 KB	-rw-r--r--	2025-03-04 13:53
resultclass.h	1.56 KB	-rw-r--r--	2025-03-04 13:53
rwlock.h	3.6 KB	-rw-r--r--	2025-03-04 13:53
safe.h	1.21 KB	-rw-r--r--	2025-03-04 13:53
serial.h	1.4 KB	-rw-r--r--	2025-03-04 13:53
sha1.h	1.52 KB	-rw-r--r--	2025-03-04 13:53
sha2.h	5.65 KB	-rw-r--r--	2025-03-04 13:53
sockaddr.h	6 KB	-rw-r--r--	2025-03-04 13:53
socket.h	35.81 KB	-rw-r--r--	2025-03-04 13:53
stat.h	805 B	-rw-r--r--	2025-03-04 13:53
stats.h	3.02 KB	-rw-r--r--	2025-03-04 13:53
stdio.h	1.74 KB	-rw-r--r--	2025-03-04 13:53
stdlib.h	703 B	-rw-r--r--	2025-03-04 13:53
stdtime.h	1.3 KB	-rw-r--r--	2025-03-04 13:53
strerror.h	776 B	-rw-r--r--	2025-03-04 13:53
string.h	5.94 KB	-rw-r--r--	2025-03-04 13:53
symtab.h	4.21 KB	-rw-r--r--	2025-03-04 13:53
syslog.h	843 B	-rw-r--r--	2025-03-04 13:53
task.h	21.08 KB	-rw-r--r--	2025-03-04 13:53
taskpool.h	3.61 KB	-rw-r--r--	2025-03-04 13:53
thread.h	1.47 KB	-rw-r--r--	2025-03-04 13:53
time.h	8.66 KB	-rw-r--r--	2025-03-04 13:53
timer.h	10.54 KB	-rw-r--r--	2025-03-04 13:53
tm.h	894 B	-rw-r--r--	2025-03-04 13:53
types.h	5.54 KB	-rw-r--r--	2025-03-04 13:53
util.h	7.49 KB	-rw-r--r--	2025-03-04 13:53
version.h	688 B	-rw-r--r--	2025-03-04 13:53
xml.h	1.07 KB	-rw-r--r--	2025-03-04 13:53

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 http://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 <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)
#include <stdatomic.h>
#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) && defined(ATOMIC_INT_LOCK_FREE)) || defined(ISC_PLATFORM_HAVEXADD)
#define ISC_REFCOUNT_HAVEATOMIC 1
#if (defined(ISC_PLATFORM_HAVESTDATOMIC) && defined(ATOMIC_INT_LOCK_FREE))
#define ISC_REFCOUNT_HAVESTDATOMIC 1
#endif

typedef struct isc_refcount {
#if defined(ISC_REFCOUNT_HAVESTDATOMIC)
	atomic_int_fast32_t refs;
#else
	isc_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_relaxed)))
#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);	\
		isc_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);	\
		isc_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);	\
		isc_int32_t prev;				\
		prev = atomic_fetch_sub_explicit		\
			(&(rp)->refs, 1, memory_order_relaxed); \
		ISC_REQUIRE(prev > 0);				\
		if (_tmp != NULL)				\
			*_tmp = prev - 1;			\
	} while (0)

#else /* 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);	\
		isc_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);	\
		isc_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);	\
		isc_int32_t prev;				\
		prev = isc_atomic_xadd(&(rp)->refs, -1);	\
		ISC_REQUIRE(prev > 0);				\
		if (_tmp != NULL)				\
			*_tmp = prev - 1;			\
	} while (0)

#endif /* ISC_REFCOUNT_HAVESTDATOMIC */

#else  /* ISC_PLATFORM_HAVEXADD */

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)

#define isc_refcount_current(rp) ((unsigned int)((rp)->refs))

/*%
 * 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_PLATFORM_HAVESTDATOMIC) && defined(ATOMIC_INT_LOCK_FREE)) || defined(ISC_PLATFORM_HAVEXADD) */
#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 */