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 pri_t sys_swappri(kthread_t *, int); 70 static int sys_alloc(void **, int); 71 72 struct classfuncs sys_classfuncs = { 73 /* messages to class manager */ 74 { 75 sys_nosys, /* admin */ 76 sys_nosys, /* getclinfo */ 77 sys_nosys, /* parmsin */ 78 sys_nosys, /* parmsout */ 79 sys_nosys, /* vaparmsin */ 80 sys_nosys, /* vaparmsout */ 81 sys_getclpri, /* getclpri */ 82 sys_alloc, 83 sys_nullsys, /* free */ 84 }, 85 /* operations on threads */ 86 { 87 sys_enterclass, /* enterclass */ 88 sys_nullsys, /* exitclass */ 89 sys_canexit, 90 sys_fork, 91 sys_forkret, /* forkret */ 92 sys_nullsys, /* parmsget */ 93 sys_nosys, /* parmsset */ 94 sys_nullsys, /* stop */ 95 sys_nullsys, /* exit */ 96 sys_nullsys, /* active */ 97 sys_nullsys, /* inactive */ 98 sys_swappri, /* swapin */ 99 sys_swappri, /* swapout */ 100 sys_nullsys, /* trapret */ 101 setfrontdq, /* preempt */ 102 setbackdq, /* setrun */ 103 sys_nullsys, /* sleep */ 104 sys_nullsys, /* tick */ 105 setbackdq, /* wakeup */ 106 sys_donice, 107 (pri_t (*)())sys_nosys, /* globpri */ 108 sys_nullsys, /* set_process_group */ 109 sys_nullsys, /* yield */ 110 sys_doprio, 111 } 112 113 }; 114 115 116 /* ARGSUSED */ 117 pri_t 118 sys_init(cid, clparmsz, clfuncspp) 119 id_t cid; 120 int clparmsz; 121 classfuncs_t **clfuncspp; 122 { 123 *clfuncspp = &sys_classfuncs; 124 return ((pri_t)v.v_maxsyspri); 125 } 126 127 /* 128 * Get maximum and minimum priorities enjoyed by sysclass threads 129 */ 130 static int 131 sys_getclpri(pcpri_t *pcprip) 132 { 133 pcprip->pc_clpmax = maxclsyspri; 134 pcprip->pc_clpmin = minclsyspri; 135 return (0); 136 } 137 138 /* ARGSUSED */ 139 static int 140 sys_enterclass(t, cid, parmsp, reqpcredp, bufp) 141 kthread_t *t; 142 id_t cid; 143 void *parmsp; 144 cred_t *reqpcredp; 145 void *bufp; 146 { 147 return (0); 148 } 149 150 /* ARGSUSED */ 151 static int 152 sys_canexit(kthread_t *t, cred_t *reqpcredp) 153 { 154 return (0); 155 } 156 157 /* ARGSUSED */ 158 static int 159 sys_fork(t, ct, bufp) 160 kthread_t *t; 161 kthread_t *ct; 162 void *bufp; 163 { 164 /* 165 * No class specific data structure 166 */ 167 return (0); 168 } 169 170 171 /* ARGSUSED */ 172 static void 173 sys_forkret(t, ct) 174 kthread_t *t; 175 kthread_t *ct; 176 { 177 register proc_t *pp = ttoproc(t); 178 register proc_t *cp = ttoproc(ct); 179 180 ASSERT(t == curthread); 181 ASSERT(MUTEX_HELD(&pidlock)); 182 183 /* 184 * Grab the child's p_lock before dropping pidlock to ensure 185 * the process does not disappear before we set it running. 186 */ 187 mutex_enter(&cp->p_lock); 188 mutex_exit(&pidlock); 189 continuelwps(cp); 190 mutex_exit(&cp->p_lock); 191 192 mutex_enter(&pp->p_lock); 193 continuelwps(pp); 194 mutex_exit(&pp->p_lock); 195 } 196 197 /* ARGSUSED */ 198 static pri_t 199 sys_swappri(t, flags) 200 kthread_t *t; 201 int flags; 202 { 203 return (-1); 204 } 205 206 static int 207 sys_nosys() 208 { 209 return (ENOSYS); 210 } 211 212 213 static void 214 sys_nullsys() 215 { 216 } 217 218 /* ARGSUSED */ 219 static int 220 sys_donice(kthread_t *t, cred_t *cr, int incr, int *retvalp) 221 { 222 return (EINVAL); 223 } 224 225 /* ARGSUSED */ 226 static int 227 sys_doprio(kthread_t *t, cred_t *cr, int incr, int *retvalp) 228 { 229 return (EINVAL); 230 } 231 232 /* ARGSUSED */ 233 static int 234 sys_alloc(void **p, int flag) 235 { 236 *p = NULL; 237 return (0); 238 } 239