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pthread_misc.c revision 1.10.4.1 
      1 /*	$NetBSD: pthread_misc.c,v 1.10.4.1 2009/09/05 12:51:09 bouyer 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  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __RCSID("$NetBSD: pthread_misc.c,v 1.10.4.1 2009/09/05 12:51:09 bouyer Exp $");
     34 
     35 #include <errno.h>
     36 #include <string.h>
     37 #include <unistd.h>
     38 
     39 #include <sys/types.h>
     40 #include <sys/pset.h>
     41 #include <sys/signal.h>
     42 #include <sys/time.h>
     43 
     44 #include <lwp.h>
     45 #include <sched.h>
     46 
     47 #include "pthread.h"
     48 #include "pthread_int.h"
     49 
     50 int	pthread__sched_yield(void);
     51 
     52 int	_sys___sigprocmask14(int, const sigset_t *, sigset_t *);
     53 int	_sys_sched_yield(void);
     54 
     55 __strong_alias(__libc_thr_sigsetmask,pthread_sigmask)
     56 __strong_alias(__sigprocmask14,pthread_sigmask)
     57 __strong_alias(__libc_thr_yield,pthread__sched_yield)
     58 
     59 int
     60 pthread_getschedparam(pthread_t thread, int *policy, struct sched_param *param)
     61 {
     62 
     63 	if (pthread__find(thread) != 0)
     64 		return ESRCH;
     65 
     66 	if (_sched_getparam(getpid(), thread->pt_lid, policy, param) < 0)
     67 		return errno;
     68 
     69 	return 0;
     70 }
     71 
     72 int
     73 pthread_setschedparam(pthread_t thread, int policy,
     74     const struct sched_param *param)
     75 {
     76 	struct sched_param sp;
     77 
     78 	if (pthread__find(thread) != 0)
     79 		return ESRCH;
     80 
     81 	memcpy(&sp, param, sizeof(struct sched_param));
     82 	if (_sched_setparam(getpid(), thread->pt_lid, policy, &sp) < 0)
     83 		return errno;
     84 
     85 	return 0;
     86 }
     87 
     88 int
     89 pthread_getaffinity_np(pthread_t thread, size_t size, cpuset_t *cpuset)
     90 {
     91 
     92 	if (pthread__find(thread) != 0)
     93 		return ESRCH;
     94 
     95 	if (_sched_getaffinity(getpid(), thread->pt_lid, size, cpuset) < 0)
     96 		return errno;
     97 
     98 	return 0;
     99 }
    100 
    101 int
    102 pthread_setaffinity_np(pthread_t thread, size_t size, cpuset_t *cpuset)
    103 {
    104 
    105 	if (pthread__find(thread) != 0)
    106 		return ESRCH;
    107 
    108 	if (_sched_setaffinity(getpid(), thread->pt_lid, size, cpuset) < 0)
    109 		return errno;
    110 
    111 	return 0;
    112 }
    113 
    114 int
    115 pthread_setschedprio(pthread_t thread, int prio)
    116 {
    117 	struct sched_param sp;
    118 
    119 	if (pthread__find(thread) != 0)
    120 		return ESRCH;
    121 
    122 	sp.sched_priority = prio;
    123 	if (_sched_setparam(getpid(), thread->pt_lid, SCHED_NONE, &sp) < 0)
    124 		return errno;
    125 
    126 	return 0;
    127 }
    128 
    129 int
    130 pthread_kill(pthread_t thread, int sig)
    131 {
    132 
    133 	if ((sig < 0) || (sig >= _NSIG))
    134 		return EINVAL;
    135 	if (pthread__find(thread) != 0)
    136 		return ESRCH;
    137 	if (_lwp_kill(thread->pt_lid, sig))
    138 		return errno;
    139 	return 0;
    140 }
    141 
    142 int
    143 pthread_sigmask(int how, const sigset_t *set, sigset_t *oset)
    144 {
    145 
    146 	if (_sys___sigprocmask14(how, set, oset))
    147 		return errno;
    148 	return 0;
    149 }
    150 
    151 int
    152 pthread__sched_yield(void)
    153 {
    154 	pthread_t self;
    155 	int error;
    156 
    157 	self = pthread__self();
    158 
    159 	/* Memory barrier for unlocked mutex release. */
    160 	membar_producer();
    161 	self->pt_blocking++;
    162 	error = _sys_sched_yield();
    163 	self->pt_blocking--;
    164 	membar_sync();
    165 
    166 	return error;
    167 }
    168