/*

 * 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.

 */

/*! \file */

#include <config.h>

#if defined(HAVE_SCHED_H)

#include <sched.h>

#endif

#include <isc/thread.h>

#include <isc/util.h>

#ifndef THREAD_MINSTACKSIZE

#define THREAD_MINSTACKSIZE		(1024U * 1024)

#endif

isc_result_t

isc_thread_create(isc_threadfunc_t func, isc_threadarg_t arg,

		  isc_thread_t *thread)

{

	pthread_attr_t attr;

#if defined(HAVE_PTHREAD_ATTR_GETSTACKSIZE) && \

    defined(HAVE_PTHREAD_ATTR_SETSTACKSIZE)

	size_t stacksize;

#endif

	int ret;

	pthread_attr_init(&attr);

#if defined(HAVE_PTHREAD_ATTR_GETSTACKSIZE) && \

    defined(HAVE_PTHREAD_ATTR_SETSTACKSIZE)

	ret = pthread_attr_getstacksize(&attr, &stacksize);

	if (ret != 0)

		return (ISC_R_UNEXPECTED);

	if (stacksize < THREAD_MINSTACKSIZE) {

		ret = pthread_attr_setstacksize(&attr, THREAD_MINSTACKSIZE);

		if (ret != 0)

			return (ISC_R_UNEXPECTED);

	}

#endif

#if defined(PTHREAD_SCOPE_SYSTEM) && defined(NEED_PTHREAD_SCOPE_SYSTEM)

	ret = pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM);

	if (ret != 0)

		return (ISC_R_UNEXPECTED);

#endif

	ret = pthread_create(thread, &attr, func, arg);

	if (ret != 0)

		return (ISC_R_UNEXPECTED);

	pthread_attr_destroy(&attr);

	return (ISC_R_SUCCESS);

}

void

isc_thread_setconcurrency(unsigned int level) {

#if defined(CALL_PTHREAD_SETCONCURRENCY)

	(void)pthread_setconcurrency(level);

#else

	UNUSED(level);

#endif

}

void

isc_thread_setname(isc_thread_t thread, const char *name) {

#if defined(HAVE_PTHREAD_SETNAME_NP) && defined(_GNU_SOURCE)

	/*

	 * macOS has pthread_setname_np but only works on the

	 * current thread so it's not used here

	*/

	(void)pthread_setname_np(thread, name);

#elif defined(HAVE_PTHREAD_SET_NAME_NP)

	(void)pthread_set_name_np(thread, name);

#else

	UNUSED(thread);

	UNUSED(name);

#endif

}

void

isc_thread_yield(void) {

#if defined(HAVE_SCHED_YIELD)

	sched_yield();

#elif defined( HAVE_PTHREAD_YIELD)

	pthread_yield();

#elif defined( HAVE_PTHREAD_YIELD_NP)

	pthread_yield_np();

#endif

}