1 /* $NetBSD: pthread_misc.c,v 1.3 2007/11/13 17:20:09 ad 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 1.3 2007/11/13 17:20:09 ad 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