1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 28 /* All Rights Reserved */ 29 30 #pragma ident "%Z%%M% %I% %E% SMI" /* from SVr4.0 1.12 */ 31 32 #include <sys/types.h> 33 #include <sys/param.h> 34 #include <sys/sysmacros.h> 35 #include <sys/signal.h> 36 #include <sys/pcb.h> 37 #include <sys/user.h> 38 #include <sys/systm.h> 39 #include <sys/sysinfo.h> 40 #include <sys/var.h> 41 #include <sys/errno.h> 42 #include <sys/cmn_err.h> 43 #include <sys/proc.h> 44 #include <sys/debug.h> 45 #include <sys/inline.h> 46 #include <sys/disp.h> 47 #include <sys/class.h> 48 #include <sys/kmem.h> 49 #include <sys/cpuvar.h> 50 #include <sys/priocntl.h> 51 52 /* 53 * Class specific code for the sys class. There are no 54 * class specific data structures associated with 55 * the sys class and the scheduling policy is trivially 56 * simple. There is no time slicing. 57 */ 58 59 pri_t sys_init(id_t, int, classfuncs_t **); 60 static int sys_getclpri(pcpri_t *); 61 static int sys_fork(kthread_t *, kthread_t *, void *); 62 static int sys_enterclass(kthread_t *, id_t, void *, cred_t *, void *); 63 static int sys_canexit(kthread_t *, cred_t *); 64 static int sys_nosys(); 65 static int sys_donice(kthread_t *, cred_t *, int, int *); 66 static int sys_doprio(kthread_t *, cred_t *, int, int *); 67 static void sys_forkret(kthread_t *, kthread_t *); 68 static void sys_nullsys(); 69 static int sys_alloc(void **, int); 70 71 struct classfuncs sys_classfuncs = { 72 /* messages to class manager */ 73 { 74 sys_nosys, /* admin */ 75 sys_nosys, /* getclinfo */ 76 sys_nosys, /* parmsin */ 77 sys_nosys, /* parmsout */ 78 sys_nosys, /* vaparmsin */ 79 sys_nosys, /* vaparmsout */ 80 sys_getclpri, /* getclpri */ 81 sys_alloc, 82 sys_nullsys, /* free */ 83 }, 84 /* operations on threads */ 85 { 86 sys_enterclass, /* enterclass */ 87 sys_nullsys, /* exitclass */ 88 sys_canexit, 89 sys_fork, 90 sys_forkret, /* forkret */ 91 sys_nullsys, /* parmsget */ 92 sys_nosys, /* parmsset */ 93 sys_nullsys, /* stop */ 94 sys_nullsys, /* exit */ 95 sys_nullsys, /* active */ 96 sys_nullsys, /* inactive */ 97 sys_nullsys, /* trapret */ 98 setfrontdq, /* preempt */ 99 setbackdq, /* setrun */ 100 sys_nullsys, /* sleep */ 101 sys_nullsys, /* tick */ 102 setbackdq, /* wakeup */ 103 sys_donice, 104 (pri_t (*)())sys_nosys, /* globpri */ 105 sys_nullsys, /* set_process_group */ 106 sys_nullsys, /* yield */ 107 sys_doprio, 108 } 109 110 }; 111 112 113 /* ARGSUSED */ 114 pri_t 115 sys_init(cid, clparmsz, clfuncspp) 116 id_t cid; 117 int clparmsz; 118 classfuncs_t **clfuncspp; 119 { 120 *clfuncspp = &sys_classfuncs; 121 return ((pri_t)v.v_maxsyspri); 122 } 123 124 /* 125 * Get maximum and minimum priorities enjoyed by sysclass threads 126 */ 127 static int 128 sys_getclpri(pcpri_t *pcprip) 129 { 130 pcprip->pc_clpmax = maxclsyspri; 131 pcprip->pc_clpmin = minclsyspri; 132 return (0); 133 } 134 135 /* ARGSUSED */ 136 static int 137 sys_enterclass(t, cid, parmsp, reqpcredp, bufp) 138 kthread_t *t; 139 id_t cid; 140 void *parmsp; 141 cred_t *reqpcredp; 142 void *bufp; 143 { 144 return (0); 145 } 146 147 /* ARGSUSED */ 148 static int 149 sys_canexit(kthread_t *t, cred_t *reqpcredp) 150 { 151 return (0); 152 } 153 154 /* ARGSUSED */ 155 static int 156 sys_fork(t, ct, bufp) 157 kthread_t *t; 158 kthread_t *ct; 159 void *bufp; 160 { 161 /* 162 * No class specific data structure 163 */ 164 return (0); 165 } 166 167 168 /* ARGSUSED */ 169 static void 170 sys_forkret(t, ct) 171 kthread_t *t; 172 kthread_t *ct; 173 { 174 register proc_t *pp = ttoproc(t); 175 register proc_t *cp = ttoproc(ct); 176 177 ASSERT(t == curthread); 178 ASSERT(MUTEX_HELD(&pidlock)); 179 180 /* 181 * Grab the child's p_lock before dropping pidlock to ensure 182 * the process does not disappear before we set it running. 183 */ 184 mutex_enter(&cp->p_lock); 185 mutex_exit(&pidlock); 186 continuelwps(cp); 187 mutex_exit(&cp->p_lock); 188 189 mutex_enter(&pp->p_lock); 190 continuelwps(pp); 191 mutex_exit(&pp->p_lock); 192 } 193 194 static int 195 sys_nosys() 196 { 197 return (ENOSYS); 198 } 199 200 201 static void 202 sys_nullsys() 203 { 204 } 205 206 /* ARGSUSED */ 207 static int 208 sys_donice(kthread_t *t, cred_t *cr, int incr, int *retvalp) 209 { 210 return (EINVAL); 211 } 212 213 /* ARGSUSED */ 214 static int 215 sys_doprio(kthread_t *t, cred_t *cr, int incr, int *retvalp) 216 { 217 return (EINVAL); 218 } 219 220 /* ARGSUSED */ 221 static int 222 sys_alloc(void **p, int flag) 223 { 224 *p = NULL; 225 return (0); 226 }