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pthread_misc.c revision 1.14.6.1 
      1 /*	$NetBSD: pthread_misc.c,v 1.14.6.1 2014/05/22 11:36:59 yamt 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 1.14.6.1 2014/05/22 11:36:59 yamt 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 #include "reentrant.h"
     50 
     51 int	pthread__sched_yield(void);
     52 
     53 int	_sys___sigprocmask14(int, const sigset_t *, sigset_t *);
     54 int	_sys_sched_yield(void);
     55 
     56 __strong_alias(__libc_thr_sigsetmask,pthread_sigmask)
     57 __strong_alias(__sigprocmask14,pthread_sigmask)
     58 __strong_alias(__libc_thr_yield,pthread__sched_yield)
     59 
     60 int
     61 pthread_getschedparam(pthread_t thread, int *policy, struct sched_param *param)
     62 {
     63 
     64 	if (pthread__find(thread) != 0)
     65 		return ESRCH;
     66 
     67 	if (_sched_getparam(getpid(), thread->pt_lid, policy, param) < 0)
     68 		return errno;
     69 
     70 	return 0;
     71 }
     72 
     73 int
     74 pthread_setschedparam(pthread_t thread, int policy,
     75     const struct sched_param *param)
     76 {
     77 	struct sched_param sp;
     78 
     79 	if (pthread__find(thread) != 0)
     80 		return ESRCH;
     81 
     82 	memcpy(&sp, param, sizeof(struct sched_param));
     83 	if (_sched_setparam(getpid(), thread->pt_lid, policy, &sp) < 0)
     84 		return errno;
     85 
     86 	return 0;
     87 }
     88 
     89 int
     90 pthread_getaffinity_np(pthread_t thread, size_t size, cpuset_t *cpuset)
     91 {
     92 
     93 	if (pthread__find(thread) != 0)
     94 		return ESRCH;
     95 
     96 	if (_sched_getaffinity(getpid(), thread->pt_lid, size, cpuset) < 0)
     97 		return errno;
     98 
     99 	return 0;
    100 }
    101 
    102 int
    103 pthread_setaffinity_np(pthread_t thread, size_t size, cpuset_t *cpuset)
    104 {
    105 
    106 	if (pthread__find(thread) != 0)
    107 		return ESRCH;
    108 
    109 	if (_sched_setaffinity(getpid(), thread->pt_lid, size, cpuset) < 0)
    110 		return errno;
    111 
    112 	return 0;
    113 }
    114 
    115 int
    116 pthread_setschedprio(pthread_t thread, int prio)
    117 {
    118 	struct sched_param sp;
    119 
    120 	if (pthread__find(thread) != 0)
    121 		return ESRCH;
    122 
    123 	sp.sched_priority = prio;
    124 	if (_sched_setparam(getpid(), thread->pt_lid, SCHED_NONE, &sp) < 0)
    125 		return errno;
    126 
    127 	return 0;
    128 }
    129 
    130 int
    131 pthread_kill(pthread_t thread, int sig)
    132 {
    133 
    134 	if ((sig < 0) || (sig >= _NSIG))
    135 		return EINVAL;
    136 	if (pthread__find(thread) != 0)
    137 		return ESRCH;
    138 	if (_lwp_kill(thread->pt_lid, sig))
    139 		return errno;
    140 	return 0;
    141 }
    142 
    143 int
    144 pthread_sigmask(int how, const sigset_t *set, sigset_t *oset)
    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 	if (__predict_false(__uselibcstub))
    158 		return __libc_thr_yield();
    159 
    160 	self = pthread__self();
    161 
    162 	/* Memory barrier for unlocked mutex release. */
    163 	membar_producer();
    164 	self->pt_blocking++;
    165 	error = _sys_sched_yield();
    166 	self->pt_blocking--;
    167 	membar_sync();
    168 
    169 	return error;
    170 }
    171