File Manager

X7ROOT File Manager

Current Path: /usr/include/bind9/isc

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

Editing: rwlock.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_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 */

X7ROOT File Manager

Editing: rwlock.h

Upload File

Create Folder