path: root/lib/libthr/thread/thr_attr.c

/*
 * Copyright (c) 2003 Craig Rodrigues <rodrigc@attbi.com>.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by Craig Rodrigues.
 * 4. Neither the name of the author nor the names of any co-contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY CRAIG RODRIGUES AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */

/*
 * Copyright (c) 1998 Daniel Eischen <eischen@vigrid.com>.
 * Copyright (C) 2001 Jason Evans <jasone@freebsd.org>.
 * Copyright (c) 2002,2003 Alexey Zelkin <phantom@FreeBSD.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice(s), this list of conditions and the following disclaimer
 *    unmodified other than the allowable addition of one or more
 *    copyright notices.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice(s), this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * Copyright (c) 1996 John Birrell <jb@cimlogic.com.au>.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the author nor the names of any co-contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $FreeBSD$
 */

#include "namespace.h"
#include <errno.h>
#include <pthread.h>
#include <stdlib.h>
#include <string.h>
#include <pthread_np.h>
#include <sys/sysctl.h>
#include "un-namespace.h"

#include "thr_private.h"

static size_t	_get_kern_cpuset_size(void);

__weak_reference(_pthread_attr_destroy, pthread_attr_destroy);

int
_pthread_attr_destroy(pthread_attr_t *attr)
{
	int	ret;

	/* Check for invalid arguments: */
	if (attr == NULL || *attr == NULL)
		/* Invalid argument: */
		ret = EINVAL;
	else {
		if ((*attr)->cpuset != NULL)
			free((*attr)->cpuset);
		/* Free the memory allocated to the attribute object: */
		free(*attr);

		/*
		 * Leave the attribute pointer NULL now that the memory
		 * has been freed:
		 */
		*attr = NULL;
		ret = 0;
	}
	return(ret);
}

__weak_reference(_pthread_attr_get_np, pthread_attr_get_np);

int
_pthread_attr_get_np(pthread_t pthread, pthread_attr_t *dstattr)
{
	struct pthread *curthread;
	struct pthread_attr attr, *dst;
	int	ret;
	size_t	kern_size;

	if (pthread == NULL || dstattr == NULL || (dst = *dstattr) == NULL)
		return (EINVAL);
	kern_size = _get_kern_cpuset_size();
	if (dst->cpuset == NULL) {
		dst->cpuset = calloc(1, kern_size);
		dst->cpusetsize = kern_size;
	}
	curthread = _get_curthread();
	if ((ret = _thr_find_thread(curthread, pthread, /*include dead*/0)) != 0)
		return (ret);
	attr = pthread->attr;
	if (pthread->flags & THR_FLAGS_DETACHED)
		attr.flags |= PTHREAD_DETACHED;
	ret = cpuset_getaffinity(CPU_LEVEL_WHICH, CPU_WHICH_TID, TID(pthread),
		dst->cpusetsize, dst->cpuset);
	if (ret == -1)
		ret = errno;
	THR_THREAD_UNLOCK(curthread, pthread);
	if (ret == 0) {
		memcpy(&dst->pthread_attr_start_copy, 
			&attr.pthread_attr_start_copy, 
			offsetof(struct pthread_attr, pthread_attr_end_copy) -
			offsetof(struct pthread_attr, pthread_attr_start_copy));
	}
	return (ret);
}

__weak_reference(_pthread_attr_getdetachstate, pthread_attr_getdetachstate);

int
_pthread_attr_getdetachstate(const pthread_attr_t *attr, int *detachstate)
{
	int	ret;

	/* Check for invalid arguments: */
	if (attr == NULL || *attr == NULL || detachstate == NULL)
		ret = EINVAL;
	else {
		/* Check if the detached flag is set: */
		if ((*attr)->flags & PTHREAD_DETACHED)
			/* Return detached: */
			*detachstate = PTHREAD_CREATE_DETACHED;
		else
			/* Return joinable: */
			*detachstate = PTHREAD_CREATE_JOINABLE;
		ret = 0;
	}
	return(ret);
}

__weak_reference(_pthread_attr_getguardsize, pthread_attr_getguardsize);

int
_pthread_attr_getguardsize(const pthread_attr_t *attr, size_t *guardsize)
{
	int	ret;

	/* Check for invalid arguments: */
	if (attr == NULL || *attr == NULL || guardsize == NULL)
		ret = EINVAL;
	else {
		/* Return the guard size: */
		*guardsize = (*attr)->guardsize_attr;
		ret = 0;
	}
	return(ret);
}

__weak_reference(_pthread_attr_getinheritsched, pthread_attr_getinheritsched);

int
_pthread_attr_getinheritsched(const pthread_attr_t *attr, int *sched_inherit)
{
	int ret = 0;

	if ((attr == NULL) || (*attr == NULL))
		ret = EINVAL;
	else
		*sched_inherit = (*attr)->sched_inherit;

	return(ret);
}

__weak_reference(_pthread_attr_getschedparam, pthread_attr_getschedparam);

int
_pthread_attr_getschedparam(const pthread_attr_t *attr, struct sched_param *param)
{
	int ret = 0;

	if ((attr == NULL) || (*attr == NULL) || (param == NULL))
		ret = EINVAL;
	else
		param->sched_priority = (*attr)->prio;

	return(ret);
}

__weak_reference(_pthread_attr_getschedpolicy, pthread_attr_getschedpolicy);

int
_pthread_attr_getschedpolicy(const pthread_attr_t *attr, int *policy)
{
	int ret = 0;

	if ((attr == NULL) || (*attr == NULL) || (policy == NULL))
		ret = EINVAL;
	else
		*policy = (*attr)->sched_policy;

	return(ret);
}

__weak_reference(_pthread_attr_getscope, pthread_attr_getscope);

int
_pthread_attr_getscope(const pthread_attr_t *attr, int *contentionscope)
{
	int ret = 0;

	if ((attr == NULL) || (*attr == NULL) || (contentionscope == NULL))
		/* Return an invalid argument: */
		ret = EINVAL;

	else
		*contentionscope = (*attr)->flags & PTHREAD_SCOPE_SYSTEM ?
		    PTHREAD_SCOPE_SYSTEM : PTHREAD_SCOPE_PROCESS;

	return(ret);
}

__weak_reference(_pthread_attr_getstack, pthread_attr_getstack);

int
_pthread_attr_getstack(const pthread_attr_t * __restrict attr,
                        void ** __restrict stackaddr,
                        size_t * __restrict stacksize)
{
	int     ret;

	/* Check for invalid arguments: */
	if (attr == NULL || *attr == NULL || stackaddr == NULL
	    || stacksize == NULL )
		ret = EINVAL;
	else {
		/* Return the stack address and size */
		*stackaddr = (*attr)->stackaddr_attr;
		*stacksize = (*attr)->stacksize_attr;
		ret = 0;
	}
	return(ret);
}

__weak_reference(_pthread_attr_getstackaddr, pthread_attr_getstackaddr);

int
_pthread_attr_getstackaddr(const pthread_attr_t *attr, void **stackaddr)
{
	int	ret;

	/* Check for invalid arguments: */
	if (attr == NULL || *attr == NULL || stackaddr == NULL)
		ret = EINVAL;
	else {
		/* Return the stack address: */
		*stackaddr = (*attr)->stackaddr_attr;
		ret = 0;
	}
	return(ret);
}

__weak_reference(_pthread_attr_getstacksize, pthread_attr_getstacksize);

int
_pthread_attr_getstacksize(const pthread_attr_t *attr, size_t *stacksize)
{
	int	ret;

	/* Check for invalid arguments: */
	if (attr == NULL || *attr == NULL || stacksize  == NULL)
		ret = EINVAL;
	else {
		/* Return the stack size: */
		*stacksize = (*attr)->stacksize_attr;
		ret = 0;
	}
	return(ret);
}

__weak_reference(_pthread_attr_init, pthread_attr_init);

int
_pthread_attr_init(pthread_attr_t *attr)
{
	int	ret;
	pthread_attr_t	pattr;

	_thr_check_init();

	/* Allocate memory for the attribute object: */
	if ((pattr = (pthread_attr_t) malloc(sizeof(struct pthread_attr))) == NULL)
		/* Insufficient memory: */
		ret = ENOMEM;
	else {
		/* Initialise the attribute object with the defaults: */
		memcpy(pattr, &_pthread_attr_default, sizeof(struct pthread_attr));

		/* Return a pointer to the attribute object: */
		*attr = pattr;
		ret = 0;
	}
	return(ret);
}

__weak_reference(_pthread_attr_setcreatesuspend_np, pthread_attr_setcreatesuspend_np);

int
_pthread_attr_setcreatesuspend_np(pthread_attr_t *attr)
{
	int	ret;

	if (attr == NULL || *attr == NULL) {
		ret = EINVAL;
	} else {
		(*attr)->suspend = THR_CREATE_SUSPENDED;
		ret = 0;
	}
	return(ret);
}

__weak_reference(_pthread_attr_setdetachstate, pthread_attr_setdetachstate);

int
_pthread_attr_setdetachstate(pthread_attr_t *attr, int detachstate)
{
	int	ret;

	/* Check for invalid arguments: */
	if (attr == NULL || *attr == NULL ||
	    (detachstate != PTHREAD_CREATE_DETACHED &&
	    detachstate != PTHREAD_CREATE_JOINABLE))
		ret = EINVAL;
	else {
		/* Check if detached state: */
		if (detachstate == PTHREAD_CREATE_DETACHED)
			/* Set the detached flag: */
			(*attr)->flags |= PTHREAD_DETACHED;
		else
			/* Reset the detached flag: */
			(*attr)->flags &= ~PTHREAD_DETACHED;
		ret = 0;
	}
	return(ret);
}

__weak_reference(_pthread_attr_setguardsize, pthread_attr_setguardsize);

int
_pthread_attr_setguardsize(pthread_attr_t *attr, size_t guardsize)
{
	int	ret;

	/* Check for invalid arguments. */
	if (attr == NULL || *attr == NULL)
		ret = EINVAL;
	else {
		/* Save the stack size. */
		(*attr)->guardsize_attr = guardsize;
		ret = 0;
	}
	return(ret);
}

__weak_reference(_pthread_attr_setinheritsched, pthread_attr_setinheritsched);

int
_pthread_attr_setinheritsched(pthread_attr_t *attr, int sched_inherit)
{
	int ret = 0;

	if ((attr == NULL) || (*attr == NULL))
		ret = EINVAL;
	else if (sched_inherit != PTHREAD_INHERIT_SCHED &&
		 sched_inherit != PTHREAD_EXPLICIT_SCHED)
		ret = ENOTSUP;
	else
		(*attr)->sched_inherit = sched_inherit;

	return(ret);
}

__weak_reference(_pthread_attr_setschedparam, pthread_attr_setschedparam);

int
_pthread_attr_setschedparam(pthread_attr_t *attr, const struct sched_param *param)
{
	int policy;

	if ((attr == NULL) || (*attr == NULL))
		return (EINVAL);

	if (param == NULL)
		return (ENOTSUP);

	policy = (*attr)->sched_policy;

	if (policy == SCHED_FIFO || policy == SCHED_RR) {
		if (param->sched_priority < _thr_priorities[policy-1].pri_min ||
		    param->sched_priority > _thr_priorities[policy-1].pri_max)
		return (ENOTSUP);
	} else {
		/*
		 * Ignore it for SCHED_OTHER now, patches for glib ports
		 * are wrongly using M:N thread library's internal macro
		 * THR_MIN_PRIORITY and THR_MAX_PRIORITY.
		 */
	}

	(*attr)->prio = param->sched_priority;

	return (0);
}

__weak_reference(_pthread_attr_setschedpolicy, pthread_attr_setschedpolicy);

int
_pthread_attr_setschedpolicy(pthread_attr_t *attr, int policy)
{
	int ret = 0;

	if ((attr == NULL) || (*attr == NULL))
		ret = EINVAL;
	else if ((policy < SCHED_FIFO) || (policy > SCHED_RR)) {
		ret = ENOTSUP;
	} else {
		(*attr)->sched_policy = policy;
		(*attr)->prio = _thr_priorities[policy-1].pri_default;
	}
	return(ret);
}

__weak_reference(_pthread_attr_setscope, pthread_attr_setscope);

int
_pthread_attr_setscope(pthread_attr_t *attr, int contentionscope)
{
	int ret = 0;

	if ((attr == NULL) || (*attr == NULL)) {
		/* Return an invalid argument: */
		ret = EINVAL;
	} else if ((contentionscope != PTHREAD_SCOPE_PROCESS) &&
	    (contentionscope != PTHREAD_SCOPE_SYSTEM)) {
		ret = EINVAL;
	} else if (contentionscope == PTHREAD_SCOPE_SYSTEM) {
		(*attr)->flags |= contentionscope;
	} else {
		(*attr)->flags &= ~PTHREAD_SCOPE_SYSTEM;
	}
	return (ret);
}

__weak_reference(_pthread_attr_setstack, pthread_attr_setstack);

int
_pthread_attr_setstack(pthread_attr_t *attr, void *stackaddr,
                        size_t stacksize)
{
	int     ret;

	/* Check for invalid arguments: */
	if (attr == NULL || *attr == NULL || stackaddr == NULL
	    || stacksize < PTHREAD_STACK_MIN)
		ret = EINVAL;
	else {
		/* Save the stack address and stack size */
		(*attr)->stackaddr_attr = stackaddr;
		(*attr)->stacksize_attr = stacksize;
		ret = 0;
	}
	return(ret);
}

__weak_reference(_pthread_attr_setstackaddr, pthread_attr_setstackaddr);

int
_pthread_attr_setstackaddr(pthread_attr_t *attr, void *stackaddr)
{
	int	ret;

	/* Check for invalid arguments: */
	if (attr == NULL || *attr == NULL || stackaddr == NULL)
		ret = EINVAL;
	else {
		/* Save the stack address: */
		(*attr)->stackaddr_attr = stackaddr;
		ret = 0;
	}
	return(ret);
}

__weak_reference(_pthread_attr_setstacksize, pthread_attr_setstacksize);

int
_pthread_attr_setstacksize(pthread_attr_t *attr, size_t stacksize)
{
	int	ret;

	/* Check for invalid arguments: */
	if (attr == NULL || *attr == NULL || stacksize < PTHREAD_STACK_MIN)
		ret = EINVAL;
	else {
		/* Save the stack size: */
		(*attr)->stacksize_attr = stacksize;
		ret = 0;
	}
	return(ret);
}

static size_t
_get_kern_cpuset_size(void)
{
	static int kern_cpuset_size = 0;

	if (kern_cpuset_size == 0) {
		size_t len;
		int maxcpus;

		len = sizeof(maxcpus);
		if (sysctlbyname("kern.smp.maxcpus", &maxcpus, &len, NULL, 0))
			PANIC("failed to get sysctl kern.smp.maxcpus");
		int nbits_long = sizeof(long) * NBBY;
		int num_long = (maxcpus + nbits_long - 1) / nbits_long;
		kern_cpuset_size = num_long * sizeof(long);
	}

	return (kern_cpuset_size);
}

__weak_reference(_pthread_attr_setaffinity_np, pthread_attr_setaffinity_np);
int
_pthread_attr_setaffinity_np(pthread_attr_t *pattr, size_t cpusetsize,
	const cpuset_t *cpusetp)
{
	pthread_attr_t attr;
	int ret;

	if (pattr == NULL || (attr = (*pattr)) == NULL)
		ret = EINVAL;
	else {
		if (cpusetsize == 0 || cpusetp == NULL) {
			if (attr->cpuset != NULL) {
				free(attr->cpuset);
				attr->cpuset = NULL;
				attr->cpusetsize = 0;
			}
			return (0);
		}
		size_t kern_size = _get_kern_cpuset_size();
		/* Kernel rejects small set, we check it here too. */ 
		if (cpusetsize < kern_size)
			return (ERANGE);
		if (cpusetsize > kern_size) {
			/* Kernel checks invalid bits, we check it here too. */
			size_t i;
			for (i = kern_size; i < cpusetsize; ++i) {
				if (((char *)cpusetp)[i])
					return (EINVAL);
			}
		}
		if (attr->cpuset == NULL) {
			attr->cpuset = calloc(1, kern_size);
			if (attr->cpuset == NULL)
				return (errno);
			attr->cpusetsize = kern_size;
		}
		memcpy(attr->cpuset, cpusetp, kern_size);
		ret = 0;
	}
	return (ret);
}

__weak_reference(_pthread_attr_getaffinity_np, pthread_attr_getaffinity_np);
int
_pthread_attr_getaffinity_np(const pthread_attr_t *pattr, size_t cpusetsize,
	cpuset_t *cpusetp)
{
	pthread_attr_t attr;
	int ret = 0;

	if (pattr == NULL || (attr = (*pattr)) == NULL)
		ret = EINVAL;
	else {
		/* Kernel rejects small set, we check it here too. */ 
		size_t kern_size = _get_kern_cpuset_size();
		if (cpusetsize < kern_size)
			return (ERANGE);
		if (attr->cpuset != NULL)
			memcpy(cpusetp, attr->cpuset, MIN(cpusetsize,
			   attr->cpusetsize));
		else
			memset(cpusetp, -1, kern_size);
		if (cpusetsize > kern_size)
			memset(((char *)cpusetp) + kern_size, 0, 
				cpusetsize - kern_size);
	}
	return (ret);
}