/*
 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * SPDX-License-Identifier: MPL-2.0
 *
 * 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

#if defined(__x86_64__)
#include <immintrin.h>
#define isc_pause() _mm_pause()
#elif defined(__i386__)
#define isc_pause() __asm__ __volatile__("rep; nop")
#elif defined(__ia64__)
#define isc_pause() __asm__ __volatile__("hint @pause")
#elif defined(__aarch64__)
#define isc_pause() __asm__ __volatile__("isb")
#elif defined(__arm__) && HAVE_ARM_YIELD
#define isc_pause() __asm__ __volatile__("yield")
#elif defined(sun) && (defined(__sparc) || defined(__sparc__))
#include <synch.h>
#define isc_pause() smt_pause()
#elif (defined(__sparc) || defined(__sparc__)) && HAVE_SPARC_PAUSE
#define isc_pause() __asm__ __volatile__("pause")
#elif defined(__ppc__) || defined(_ARCH_PPC) || defined(_ARCH_PWR) || \
	defined(_ARCH_PWR2) || defined(_POWER)
#define isc_pause() __asm__ volatile("or 27,27,27")
#else
#define isc_pause() sched_yield()
#endif

#define isc_pause_n(iters)                                     \
	for (size_t __pause = 0; __pause < iters; __pause++) { \
		isc_pause();                                   \
	}