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/*
 * 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_ATOMIC_H
#define ISC_ATOMIC_H 1

#include <inttypes.h>

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

#ifdef ISC_PLATFORM_USEGCCASM
/*
 * This routine atomically increments the value stored in 'p' by 'val', and
 * returns the previous value.
 */
static __inline__ int32_t
isc_atomic_xadd(int32_t *p, int32_t val) {
	int32_t prev = val;

__asm__ volatile(
#ifdef ISC_PLATFORM_USETHREADS
		"lock;"
#endif
		"xadd %0, %1"
		:"=q"(prev)
		:"m"(*p), "0"(prev)
		:"memory", "cc");

return (prev);
}

#ifdef ISC_PLATFORM_HAVEXADDQ
static __inline__ int64_t
isc_atomic_xaddq(int64_t *p, int64_t val) {
	int64_t prev = val;

__asm__ volatile(
#ifdef ISC_PLATFORM_USETHREADS
	    "lock;"
#endif
	    "xaddq %0, %1"
	    :"=q"(prev)
	    :"m"(*p), "0"(prev)
	    :"memory", "cc");

return (prev);
}
#endif /* ISC_PLATFORM_HAVEXADDQ */

/*
 * This routine atomically stores the value 'val' in 'p' (32-bit version).
 */
static __inline__ void
isc_atomic_store(int32_t *p, int32_t val) {
	__asm__ volatile(
#ifdef ISC_PLATFORM_USETHREADS
		/*
		 * xchg should automatically lock memory, but we add it
		 * explicitly just in case (it at least doesn't harm)
		 */
		"lock;"
#endif

"xchgl %1, %0"
		:
		: "r"(val), "m"(*p)
		: "memory");
}

#ifdef ISC_PLATFORM_HAVEATOMICSTOREQ
/*
 * This routine atomically stores the value 'val' in 'p' (64-bit version).
 */
static __inline__ void
isc_atomic_storeq(int64_t *p, int64_t val) {
	__asm__ volatile(
#ifdef ISC_PLATFORM_USETHREADS
		/*
		 * xchg should automatically lock memory, but we add it
		 * explicitly just in case (it at least doesn't harm)
		 */
		"lock;"
#endif

"xchgq %1, %0"
		:
		: "r"(val), "m"(*p)
		: "memory");
}
#endif /* ISC_PLATFORM_HAVEATOMICSTOREQ */

/*
 * This routine atomically replaces the value in 'p' with 'val', if the
 * original value is equal to 'cmpval'.  The original value is returned in any
 * case.
 */
static __inline__ int32_t
isc_atomic_cmpxchg(int32_t *p, int32_t cmpval, int32_t val) {
	__asm__ volatile(
#ifdef ISC_PLATFORM_USETHREADS
		"lock;"
#endif
		"cmpxchgl %1, %2"
		: "=a"(cmpval)
		: "r"(val), "m"(*p), "a"(cmpval)
		: "memory");

return (cmpval);
}

#elif defined(ISC_PLATFORM_USESTDASM)
/*
 * The following are "generic" assembly code which implements the same
 * functionality in case the gcc extension cannot be used.  It should be
 * better to avoid inlining below, since we directly refer to specific
 * positions of the stack frame, which would not actually point to the
 * intended address in the embedded mnemonic.
 */
static int32_t
isc_atomic_xadd(int32_t *p, int32_t val) {
	(void)(p);
	(void)(val);

__asm (
		"movl 8(%ebp), %ecx\n"
		"movl 12(%ebp), %edx\n"
#ifdef ISC_PLATFORM_USETHREADS
		"lock;"
#endif
		"xadd %edx, (%ecx)\n"

/*
		 * set the return value directly in the register so that we
		 * can avoid guessing the correct position in the stack for a
		 * local variable.
		 */
		"movl %edx, %eax"
		);
}

static void
isc_atomic_store(int32_t *p, int32_t val) {
	(void)(p);
	(void)(val);

__asm (
		"movl 8(%ebp), %ecx\n"
		"movl 12(%ebp), %edx\n"
#ifdef ISC_PLATFORM_USETHREADS
		"lock;"
#endif
		"xchgl (%ecx), %edx\n"
		);
}

static int32_t
isc_atomic_cmpxchg(int32_t *p, int32_t cmpval, int32_t val) {
	(void)(p);
	(void)(cmpval);
	(void)(val);

__asm (
		"movl 8(%ebp), %ecx\n"
		"movl 12(%ebp), %eax\n"	/* must be %eax for cmpxchgl */
		"movl 16(%ebp), %edx\n"
#ifdef ISC_PLATFORM_USETHREADS
		"lock;"
#endif

/*
		 * If (%ecx) == %eax then (%ecx) := %edx.
		 % %eax is set to old (%ecx), which will be the return value.
		 */
		"cmpxchgl %edx, (%ecx)"
		);
}
#else /* !ISC_PLATFORM_USEGCCASM && !ISC_PLATFORM_USESTDASM */

#error "unsupported compiler.  disable atomic ops by --disable-atomic"

#endif
#endif /* ISC_ATOMIC_H */

Batal

⬅ bind9 108 item

Nama	Tipe	Ukuran	Diubah	Aksi
📄aes.h	h	1.1 KB	2026-08-13 18:52	✏️ 👁️
📄app.h	h	10.2 KB	2026-08-13 18:52	✏️ 👁️
📄assertions.h	h	2.8 KB	2026-08-13 18:52	✏️ 👁️
📄atomic.h	h	4.1 KB	2026-08-13 18:52	✏️ 👁️
📄backtrace.h	h	3.8 KB	2026-08-13 18:52	✏️ 👁️
📄base32.h	h	4.3 KB	2026-08-13 18:52	✏️ 👁️
📄base64.h	h	2.8 KB	2026-08-13 18:52	✏️ 👁️
📄bind9.h	h	830 B	2026-08-13 18:52	✏️ 👁️
📄boolean.h	h	594 B	2026-08-13 18:52	✏️ 👁️
📄buffer.h	h	25.7 KB	2026-08-13 18:52	✏️ 👁️
📄bufferlist.h	h	1.4 KB	2026-08-13 18:52	✏️ 👁️
📄cmocka.h	h	1.4 KB	2026-08-13 18:52	✏️ 👁️
📄commandline.h	h	1.7 KB	2026-08-13 18:52	✏️ 👁️
📄condition.h	h	1.4 KB	2026-08-13 18:52	✏️ 👁️
📄counter.h	h	1.9 KB	2026-08-13 18:52	✏️ 👁️
📄crc64.h	h	998 B	2026-08-13 18:52	✏️ 👁️
📄deprecated.h	h	623 B	2026-08-13 18:52	✏️ 👁️
📄dir.h	h	1.6 KB	2026-08-13 18:52	✏️ 👁️
📄endian.h	h	4.7 KB	2026-08-13 18:52	✏️ 👁️
📄entropy.h	h	10.1 KB	2026-08-13 18:52	✏️ 👁️
📄errno.h	h	659 B	2026-08-13 18:52	✏️ 👁️
📄errno2result.h	h	902 B	2026-08-13 18:53	✏️ 👁️
📄error.h	h	1.4 KB	2026-08-13 18:52	✏️ 👁️
📄event.h	h	3 KB	2026-08-13 18:52	✏️ 👁️
📄eventclass.h	h	1.3 KB	2026-08-13 18:52	✏️ 👁️
📄file.h	h	11.4 KB	2026-08-13 18:52	✏️ 👁️
📄formatcheck.h	h	893 B	2026-08-13 18:52	✏️ 👁️
📄fsaccess.h	h	7.3 KB	2026-08-13 18:52	✏️ 👁️
📄hash.h	h	7.5 KB	2026-08-13 18:52	✏️ 👁️
📄heap.h	h	5.1 KB	2026-08-13 18:52	✏️ 👁️
📄hex.h	h	2.7 KB	2026-08-13 18:52	✏️ 👁️
📄hmacmd5.h	h	1.7 KB	2026-08-13 18:52	✏️ 👁️
📄hmacsha.h	h	4.4 KB	2026-08-13 18:52	✏️ 👁️
📄ht.h	h	4.3 KB	2026-08-13 18:52	✏️ 👁️
📄httpd.h	h	2.3 KB	2026-08-13 18:52	✏️ 👁️
📄int.h	h	1.1 KB	2026-08-13 18:52	✏️ 👁️
📄interfaceiter.h	h	3 KB	2026-08-13 18:52	✏️ 👁️
📄iterated_hash.h	h	1 KB	2026-08-13 18:52	✏️ 👁️
📄json.h	h	1.4 KB	2026-08-13 18:52	✏️ 👁️
📄keyboard.h	h	989 B	2026-08-13 18:52	✏️ 👁️
📄lang.h	h	637 B	2026-08-13 18:52	✏️ 👁️
📄lex.h	h	9.5 KB	2026-08-13 18:52	✏️ 👁️
📄lfsr.h	h	2.9 KB	2026-08-13 18:52	✏️ 👁️
📄lib.h	h	1 KB	2026-08-13 18:52	✏️ 👁️
📄likely.h	h	818 B	2026-08-13 18:52	✏️ 👁️
📄list.h	h	5.6 KB	2026-08-13 18:52	✏️ 👁️
📄log.h	h	28.1 KB	2026-08-13 18:52	✏️ 👁️
📄magic.h	h	994 B	2026-08-13 18:52	✏️ 👁️
📄md5.h	h	2.3 KB	2026-08-13 18:52	✏️ 👁️
📄mem.h	h	20.6 KB	2026-08-13 18:52	✏️ 👁️
📄meminfo.h	h	710 B	2026-08-13 18:52	✏️ 👁️
📄msgcat.h	h	2.7 KB	2026-08-13 18:52	✏️ 👁️
📄msgs.h	h	8.2 KB	2026-08-13 18:52	✏️ 👁️
📄mutex.h	h	3.4 KB	2026-08-13 18:52	✏️ 👁️
📄mutexblock.h	h	1.3 KB	2026-08-13 18:52	✏️ 👁️
📄net.h	h	10.3 KB	2026-08-13 18:52	✏️ 👁️
📄netaddr.h	h	4.5 KB	2026-08-13 18:52	✏️ 👁️
📄netdb.h	h	863 B	2026-08-13 18:52	✏️ 👁️
📄netscope.h	h	967 B	2026-08-13 18:52	✏️ 👁️
📄offset.h	h	700 B	2026-08-13 18:52	✏️ 👁️
📄once.h	h	983 B	2026-08-13 18:52	✏️ 👁️
📄ondestroy.h	h	2.7 KB	2026-08-13 18:52	✏️ 👁️
📄os.h	h	671 B	2026-08-13 18:52	✏️ 👁️
📄parseint.h	h	1.5 KB	2026-08-13 18:52	✏️ 👁️
📄platform.h	h	9.5 KB	2026-08-13 18:52	✏️ 👁️
📄pool.h	h	3.4 KB	2026-08-13 18:52	✏️ 👁️
📄portset.h	h	3.2 KB	2026-08-13 18:52	✏️ 👁️
📄print.h	h	2.4 KB	2026-08-13 18:52	✏️ 👁️
📄queue.h	h	5.1 KB	2026-08-13 18:52	✏️ 👁️
📄quota.h	h	2.4 KB	2026-08-13 18:52	✏️ 👁️
📄radix.h	h	6.3 KB	2026-08-13 18:52	✏️ 👁️
📄random.h	h	3.5 KB	2026-08-13 18:52	✏️ 👁️
📄ratelimiter.h	h	3.4 KB	2026-08-13 18:52	✏️ 👁️
📄refcount.h	h	8 KB	2026-08-13 18:52	✏️ 👁️
📄regex.h	h	767 B	2026-08-13 18:52	✏️ 👁️
📄region.h	h	2 KB	2026-08-13 18:52	✏️ 👁️
📄resource.h	h	2.8 KB	2026-08-13 18:52	✏️ 👁️
📄result.h	h	4.9 KB	2026-08-13 18:52	✏️ 👁️
📄resultclass.h	h	1.6 KB	2026-08-13 18:52	✏️ 👁️
📄rwlock.h	h	3.7 KB	2026-08-13 18:52	✏️ 👁️
📄safe.h	h	1.3 KB	2026-08-13 18:52	✏️ 👁️
📄serial.h	h	1.3 KB	2026-08-13 18:52	✏️ 👁️
📄sha1.h	h	1.5 KB	2026-08-13 18:52	✏️ 👁️
📄sha2.h	h	5.6 KB	2026-08-13 18:52	✏️ 👁️
📄siphash.h	h	734 B	2026-08-13 18:52	✏️ 👁️
📄sockaddr.h	h	5.9 KB	2026-08-13 18:52	✏️ 👁️
📄socket.h	h	35.8 KB	2026-08-13 18:52	✏️ 👁️
📄stat.h	h	806 B	2026-08-13 18:52	✏️ 👁️
📄stats.h	h	3.6 KB	2026-08-13 18:52	✏️ 👁️
📄stdatomic.h	h	5.1 KB	2026-08-13 18:52	✏️ 👁️
📄stdio.h	h	1.7 KB	2026-08-13 18:52	✏️ 👁️
📄stdlib.h	h	704 B	2026-08-13 18:52	✏️ 👁️
📄stdtime.h	h	1 KB	2026-08-13 18:52	✏️ 👁️
📄strerror.h	h	777 B	2026-08-13 18:52	✏️ 👁️
📄string.h	h	5.9 KB	2026-08-13 18:52	✏️ 👁️
📄symtab.h	h	4.2 KB	2026-08-13 18:52	✏️ 👁️
📄syslog.h	h	844 B	2026-08-13 18:52	✏️ 👁️
📄task.h	h	21 KB	2026-08-13 18:52	✏️ 👁️
📄taskpool.h	h	3.6 KB	2026-08-13 18:52	✏️ 👁️
📄thread.h	h	1.5 KB	2026-08-13 18:52	✏️ 👁️
📄time.h	h	8.7 KB	2026-08-13 18:52	✏️ 👁️
📄timer.h	h	10.5 KB	2026-08-13 18:52	✏️ 👁️
📄tm.h	h	895 B	2026-08-13 18:52	✏️ 👁️
📄types.h	h	5.6 KB	2026-08-13 18:52	✏️ 👁️
📄utf8.h	h	928 B	2026-08-13 18:52	✏️ 👁️
📄util.h	h	10.3 KB	2026-08-13 18:52	✏️ 👁️
📄version.h	h	689 B	2026-08-13 18:52	✏️ 👁️
📄xml.h	h	1.1 KB	2026-08-13 18:52	✏️ 👁️

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