1 /* 2 * 3 * Portions of this code was derived from the file kern_fork.c and as such 4 * is subject to the copyrights below. 5 * 6 * Copyright (c) 1982, 1986, 1989, 1991, 1993 7 * The Regents of the University of California. All rights reserved. 8 * (c) UNIX System Laboratories, Inc. 9 * All or some portions of this file are derived from material licensed 10 * to the University of California by American Telephone and Telegraph 11 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 12 * the permission of UNIX System Laboratories, Inc. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 3. All advertising materials mentioning features or use of this software 23 * must display the following acknowledgement: 24 * This product includes software developed by the University of 25 * California, Berkeley and its contributors. 26 * 4. Neither the name of the University nor the names of its contributors 27 * may be used to endorse or promote products derived from this software 28 * without specific prior written permission. 29 * 30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 40 * SUCH DAMAGE. 41 * 42 * Copyright (c) 1996 Douglas Santry 43 * 44 * This code is subject to the beer copyright. If I chance to meet you in a 45 * bar and this code helped you in some way, you owe me a beer. Only 46 * in Germany will I accept domestic beer. This code may or may not work 47 * and I certainly make no claims as to its fitness for *any* purpose. 48 * 49 * $FreeBSD: src/sys/kern/kern_threads.c,v 1.15 1999/08/28 00:46:15 peter Exp $ 50 * $DragonFly: src/sys/kern/kern_threads.c,v 1.12 2007/02/18 16:12:43 corecode Exp $ 51 */ 52 53 #include <sys/param.h> 54 #include <sys/systm.h> 55 #include <sys/kernel.h> 56 #include <sys/proc.h> 57 #include <sys/resourcevar.h> 58 #include <sys/sysproto.h> 59 #include <sys/uio.h> /* uio_yield() fixme */ 60 61 #if 0 62 63 /* 64 * XXX lwp 65 * 66 * I am unhappy code, please remove me 67 */ 68 69 70 /* 71 * Low level support for sleep/wakeup paradigm 72 * If a timeout is specified: 73 * returns 0 if wakeup 74 * returns EAGAIN if timed out 75 * returns EINVAL if error 76 * 77 * If a timeout is not specified: 78 * 79 * returns time waiting in ticks. 80 */ 81 int 82 sys_thr_sleep(struct thr_sleep_args *uap) 83 { 84 struct proc *p = curproc; 85 struct lwp *lp = curthread->td_lwp; 86 int sleepstart; 87 struct timespec ts; 88 struct timeval atv; 89 int error, timo; 90 91 timo = 0; 92 if (uap->timeout != 0) { 93 /* 94 * Get timespec struct 95 */ 96 if ((error = copyin(uap->timeout, &ts, sizeof(ts))) != 0) { 97 p->p_wakeup = 0; 98 return error; 99 } 100 if (ts.tv_nsec < 0 || ts.tv_nsec >= 1000000000) { 101 p->p_wakeup = 0; 102 return (EINVAL); 103 } 104 TIMESPEC_TO_TIMEVAL(&atv, &ts); 105 if (itimerfix(&atv)) { 106 p->p_wakeup = 0; 107 return (EINVAL); 108 } 109 timo = tvtohz_high(&atv); 110 } 111 112 uap->sysmsg_result = 0; 113 if (p->p_wakeup == 0) { 114 sleepstart = ticks; 115 lp->lwp_flag |= LWP_SINTR; 116 error = tsleep(p, 0, "thrslp", timo); 117 lp->lwp_flag &= ~LWP_SINTR; 118 if (error == EWOULDBLOCK) { 119 p->p_wakeup = 0; 120 uap->sysmsg_result = EAGAIN; 121 return 0; 122 } 123 if (uap->timeout == 0) 124 uap->sysmsg_result = ticks - sleepstart; 125 } 126 p->p_wakeup = 0; 127 return (0); 128 } 129 130 int 131 sys_thr_wakeup(struct thr_wakeup_args *uap) 132 { 133 struct proc *p = curproc; 134 struct proc *pSlave = p->p_leader; 135 struct lwp *lpSlave; 136 137 while(pSlave && (pSlave->p_pid != uap->pid)) 138 pSlave = pSlave->p_peers; 139 140 if(pSlave == 0) { 141 uap->sysmsg_result = ESRCH; 142 return(0); 143 } 144 145 lpSlave = FIRST_LWP_IN_PROC(pSlave); 146 pSlave->p_wakeup++; 147 if((lpSlave->lwp_stat == LSSLEEP) && lpSlave->lwp_wchan == pSlave) { 148 wakeup(pSlave); 149 return(0); 150 } 151 152 uap->sysmsg_result = EAGAIN; 153 return 0; 154 } 155 156 #endif 157 158 /* 159 * General purpose yield system call 160 * 161 * MPSAFE 162 */ 163 int 164 sys_yield(struct yield_args *uap) 165 { 166 uap->sysmsg_result = 0; 167 uio_yield(); 168 return(0); 169 } 170 171