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pthread_misc.c revision 1.2.2.2 
      1 /*	pthread_misc.c,v 1.2.2.1 2008/01/09 01:36:37 matt 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("pthread_misc.c,v 1.2.2.1 2008/01/09 01:36:37 matt 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, policy, param) < 0)
     76 		return errno;
     77 
     78 	return 0;
     79 }
     80 
     81 int
     82 pthread_setschedparam(pthread_t thread, int policy,
     83     const struct sched_param *param)
     84 {
     85 	struct sched_param sp;
     86 
     87 	if (pthread__find(thread) != 0)
     88 		return ESRCH;
     89 
     90 	memcpy(&sp, param, sizeof(struct sched_param));
     91 	if (_sched_setparam(getpid(), thread->pt_lid, policy, &sp) < 0)
     92 		return errno;
     93 
     94 	return 0;
     95 }
     96 
     97 int
     98 pthread_getaffinity_np(pthread_t thread, size_t size, cpuset_t *cpuset)
     99 {
    100 
    101 	if (pthread__find(thread) != 0)
    102 		return ESRCH;
    103 
    104 	if (_sched_getaffinity(getpid(), thread->pt_lid, size, cpuset) < 0)
    105 		return errno;
    106 
    107 	return 0;
    108 }
    109 
    110 int
    111 pthread_setaffinity_np(pthread_t thread, size_t size, cpuset_t *cpuset)
    112 {
    113 
    114 	if (pthread__find(thread) != 0)
    115 		return ESRCH;
    116 
    117 	if (_sched_setaffinity(getpid(), thread->pt_lid, size, cpuset) < 0)
    118 		return errno;
    119 
    120 	return 0;
    121 }
    122 
    123 int
    124 pthread_setschedprio(pthread_t thread, int prio)
    125 {
    126 	struct sched_param sp;
    127 
    128 	if (pthread__find(thread) != 0)
    129 		return ESRCH;
    130 
    131 	sp.sched_priority = prio;
    132 	if (_sched_setparam(getpid(), thread->pt_lid, SCHED_NONE, &sp) < 0)
    133 		return errno;
    134 
    135 	return 0;
    136 }
    137 
    138 int
    139 pthread_kill(pthread_t thread, int sig)
    140 {
    141 
    142 	if ((sig < 0) || (sig >= _NSIG))
    143 		return EINVAL;
    144 	if (pthread__find(thread) != 0)
    145 		return ESRCH;
    146 
    147 	return _lwp_kill(thread->pt_lid, sig);
    148 }
    149 
    150 int
    151 pthread_sigmask(int how, const sigset_t *set, sigset_t *oset)
    152 {
    153 
    154 	return _sys___sigprocmask14(how, set, oset);
    155 }
    156 
    157 int
    158 nanosleep(const struct timespec *rqtp, struct timespec *rmtp)
    159 {
    160 
    161 	/*
    162 	 * For now, just nanosleep.  In the future, maybe pass a ucontext_t
    163 	 * to _lwp_nanosleep() and allow it to recycle our kernel stack.
    164 	 */
    165 	return  _sys_nanosleep(rqtp, rmtp);
    166 }
    167 
    168 int
    169 pthread__sched_yield(void)
    170 {
    171 	pthread_t self;
    172 	int error;
    173 
    174 	self = pthread__self();
    175 
    176 	/* Memory barrier for unlocked mutex release. */
    177 	membar_producer();
    178 	self->pt_blocking++;
    179 	error = _sys_sched_yield();
    180 	self->pt_blocking--;
    181 	membar_sync();
    182 
    183 	return error;
    184 }
    185