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pthread_misc.c revision 1.5 
      1 /*	$NetBSD: pthread_misc.c,v 1.5 2008/01/26 17:55:30 rmind Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2001, 2006, 2007, 2008 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Nathan J. Williams.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/cdefs.h>
     40 __RCSID("$NetBSD: pthread_misc.c,v 1.5 2008/01/26 17:55:30 rmind Exp $");
     41 
     42 #include <errno.h>
     43 #include <string.h>
     44 #include <unistd.h>
     45 
     46 #include <sys/types.h>
     47 #include <sys/pset.h>
     48 #include <sys/signal.h>
     49 #include <sys/time.h>
     50 
     51 #include <lwp.h>
     52 #include <sched.h>
     53 
     54 #include "pthread.h"
     55 #include "pthread_int.h"
     56 
     57 int	pthread__sched_yield(void);
     58 
     59 int	_sys___sigprocmask14(int, const sigset_t *, sigset_t *);
     60 int	_sys_nanosleep(const struct timespec *, struct timespec *);
     61 int	_sys_sched_yield(void);
     62 
     63 __strong_alias(_nanosleep, nanosleep)
     64 __strong_alias(__libc_thr_sigsetmask,pthread_sigmask)
     65 __strong_alias(__sigprocmask14,pthread_sigmask)
     66 __strong_alias(__libc_thr_yield,pthread__sched_yield)
     67 
     68 int
     69 pthread_getschedparam(pthread_t thread, int *policy, struct sched_param *param)
     70 {
     71 
     72 	if (pthread__find(thread) != 0)
     73 		return ESRCH;
     74 
     75 	if (_sched_getparam(getpid(), thread->pt_lid, param) < 0)
     76 		return errno;
     77 
     78 	*policy = param->sched_class;
     79 	return 0;
     80 }
     81 
     82 int
     83 pthread_setschedparam(pthread_t thread, int policy,
     84     const struct sched_param *param)
     85 {
     86 	struct sched_param sp;
     87 
     88 	if (pthread__find(thread) != 0)
     89 		return ESRCH;
     90 
     91 	memcpy(&sp, param, sizeof(struct sched_param));
     92 	sp.sched_class = policy;
     93 	if (_sched_setparam(getpid(), thread->pt_lid, &sp) < 0)
     94 		return errno;
     95 
     96 	return 0;
     97 }
     98 
     99 int
    100 pthread_getaffinity_np(pthread_t thread, size_t size, cpuset_t *cpuset)
    101 {
    102 
    103 	if (pthread__find(thread) != 0)
    104 		return ESRCH;
    105 
    106 	if (_sched_getaffinity(getpid(), thread->pt_lid, size, cpuset) < 0)
    107 		return errno;
    108 
    109 	return 0;
    110 }
    111 
    112 int
    113 pthread_setaffinity_np(pthread_t thread, size_t size, cpuset_t *cpuset)
    114 {
    115 
    116 	if (pthread__find(thread) != 0)
    117 		return ESRCH;
    118 
    119 	if (_sched_setaffinity(getpid(), thread->pt_lid, size, cpuset) < 0)
    120 		return errno;
    121 
    122 	return 0;
    123 }
    124 
    125 int
    126 pthread_setschedprio(pthread_t thread, int prio)
    127 {
    128 	struct sched_param sp;
    129 
    130 	if (pthread__find(thread) != 0)
    131 		return ESRCH;
    132 
    133 	sp.sched_class = SCHED_NONE;
    134 	sp.sched_priority = prio;
    135 	if (_sched_setparam(getpid(), thread->pt_lid, &sp) < 0)
    136 		return errno;
    137 
    138 	return 0;
    139 }
    140 
    141 int
    142 pthread_kill(pthread_t thread, int sig)
    143 {
    144 
    145 	if ((sig < 0) || (sig >= _NSIG))
    146 		return EINVAL;
    147 	if (pthread__find(thread) != 0)
    148 		return ESRCH;
    149 
    150 	return _lwp_kill(thread->pt_lid, sig);
    151 }
    152 
    153 int
    154 pthread_sigmask(int how, const sigset_t *set, sigset_t *oset)
    155 {
    156 
    157 	return _sys___sigprocmask14(how, set, oset);
    158 }
    159 
    160 int
    161 nanosleep(const struct timespec *rqtp, struct timespec *rmtp)
    162 {
    163 
    164 	/*
    165 	 * For now, just nanosleep.  In the future, maybe pass a ucontext_t
    166 	 * to _lwp_nanosleep() and allow it to recycle our kernel stack.
    167 	 */
    168 	return  _sys_nanosleep(rqtp, rmtp);
    169 }
    170 
    171 int
    172 pthread__sched_yield(void)
    173 {
    174 	pthread_t self;
    175 	int error;
    176 
    177 	self = pthread__self();
    178 
    179 #ifdef PTHREAD__HAVE_ATOMIC
    180 	/* Memory barrier for unlocked mutex release. */
    181 	pthread__membar_producer();
    182 #endif
    183 	self->pt_blocking++;
    184 	error = _sys_sched_yield();
    185 	self->pt_blocking--;
    186 
    187 	return error;
    188 }
    189