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pthread_misc.c revision 1.2.2.1 
      1 /*	$NetBSD: pthread_misc.c,v 1.2.2.1 2008/01/09 01:36:37 matt Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2001, 2006, 2007 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 1.2.2.1 2008/01/09 01:36:37 matt Exp $");
     41 
     42 #include <sys/types.h>
     43 #include <sys/signal.h>
     44 #include <sys/time.h>
     45 
     46 #include <errno.h>
     47 #include <lwp.h>
     48 
     49 #include "pthread.h"
     50 #include "pthread_int.h"
     51 
     52 int	pthread__sched_yield(void);
     53 
     54 int	_sys___sigprocmask14(int, const sigset_t *, sigset_t *);
     55 int	_sys_nanosleep(const struct timespec *, struct timespec *);
     56 int	_sys_sched_yield(void);
     57 
     58 __strong_alias(_nanosleep, nanosleep)
     59 __strong_alias(__libc_thr_sigsetmask,pthread_sigmask)
     60 __strong_alias(__sigprocmask14,pthread_sigmask)
     61 __strong_alias(__libc_thr_yield,pthread__sched_yield)
     62 
     63 /*ARGSUSED*/
     64 int
     65 pthread_getschedparam(pthread_t thread, int *policy, struct sched_param *param)
     66 {
     67 	if (param == NULL || policy == NULL)
     68 		return EINVAL;
     69 	param->sched_priority = 0;
     70 	*policy = SCHED_RR;
     71 	return 0;
     72 }
     73 
     74 /*ARGSUSED*/
     75 int
     76 pthread_setschedparam(pthread_t thread, int policy,
     77     const struct sched_param *param)
     78 {
     79 	if (param == NULL || policy < SCHED_FIFO || policy > SCHED_RR)
     80 		return EINVAL;
     81 	if (param->sched_priority > 0 || policy != SCHED_RR)
     82 		return ENOTSUP;
     83 	return 0;
     84 }
     85 
     86 int
     87 pthread_kill(pthread_t thread, int sig)
     88 {
     89 
     90 	if ((sig < 0) || (sig >= _NSIG))
     91 		return EINVAL;
     92 	if (pthread__find(thread) != 0)
     93 		return ESRCH;
     94 
     95 	return _lwp_kill(thread->pt_lid, sig);
     96 }
     97 
     98 int
     99 pthread_sigmask(int how, const sigset_t *set, sigset_t *oset)
    100 {
    101 
    102 	return _sys___sigprocmask14(how, set, oset);
    103 }
    104 
    105 int
    106 nanosleep(const struct timespec *rqtp, struct timespec *rmtp)
    107 {
    108 
    109 	/*
    110 	 * For now, just nanosleep.  In the future, maybe pass a ucontext_t
    111 	 * to _lwp_nanosleep() and allow it to recycle our kernel stack.
    112 	 */
    113 	return  _sys_nanosleep(rqtp, rmtp);
    114 }
    115 
    116 int
    117 pthread__sched_yield(void)
    118 {
    119 	pthread_t self;
    120 	int error;
    121 
    122 	self = pthread__self();
    123 
    124 #ifdef PTHREAD__HAVE_ATOMIC
    125 	/* Memory barrier for unlocked mutex release. */
    126 	pthread__membar_producer();
    127 #endif
    128 	self->pt_blocking++;
    129 	error = _sys_sched_yield();
    130 	self->pt_blocking--;
    131 
    132 	return error;
    133 }
    134