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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright (c) 1996-2001 by Sun Microsystems, Inc. 24 * All rights reserved. 25 */ 26 27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 28 /* All Rights Reserved */ 29 30 31 #pragma ident "%Z%%M% %I% %E% SMI" /* from SVr4.0 1.12 */ 32 33 #include <sys/types.h> 34 #include <sys/param.h> 35 #include <sys/sysmacros.h> 36 #include <sys/signal.h> 37 #include <sys/pcb.h> 38 #include <sys/user.h> 39 #include <sys/systm.h> 40 #include <sys/sysinfo.h> 41 #include <sys/var.h> 42 #include <sys/errno.h> 43 #include <sys/cmn_err.h> 44 #include <sys/proc.h> 45 #include <sys/debug.h> 46 #include <sys/inline.h> 47 #include <sys/disp.h> 48 #include <sys/class.h> 49 #include <sys/kmem.h> 50 #include <sys/cpuvar.h> 51 #include <sys/priocntl.h> 52 53 /* 54 * Class specific code for the sys class. There are no 55 * class specific data structures associated with 56 * the sys class and the scheduling policy is trivially 57 * simple. There is no time slicing. 58 */ 59 60 pri_t sys_init(id_t, int, classfuncs_t **); 61 static int sys_getclpri(pcpri_t *); 62 static int sys_fork(kthread_id_t, kthread_id_t, void *); 63 static int sys_enterclass(kthread_id_t, id_t, void *, cred_t *, void *); 64 static int sys_canexit(kthread_id_t, cred_t *); 65 static int sys_nosys(); 66 static int sys_donice(kthread_id_t, cred_t *, int, int *); 67 static void sys_forkret(kthread_id_t, kthread_id_t); 68 static void sys_nullsys(); 69 static pri_t sys_swappri(kthread_id_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 #ifdef KSLICE 102 sys_preempt, 103 #else 104 setfrontdq, 105 #endif 106 setbackdq, /* setrun */ 107 sys_nullsys, /* sleep */ 108 sys_nullsys, /* tick */ 109 setbackdq, /* wakeup */ 110 sys_donice, 111 (pri_t (*)())sys_nosys, /* globpri */ 112 sys_nullsys, /* set_process_group */ 113 sys_nullsys, /* yield */ 114 } 115 116 }; 117 118 119 /* ARGSUSED */ 120 pri_t 121 sys_init(cid, clparmsz, clfuncspp) 122 id_t cid; 123 int clparmsz; 124 classfuncs_t **clfuncspp; 125 { 126 *clfuncspp = &sys_classfuncs; 127 return ((pri_t)v.v_maxsyspri); 128 } 129 130 /* 131 * Get maximum and minimum priorities enjoyed by sysclass threads 132 */ 133 static int 134 sys_getclpri(pcpri_t *pcprip) 135 { 136 pcprip->pc_clpmax = maxclsyspri; 137 pcprip->pc_clpmin = 0; 138 return (0); 139 } 140 141 /* ARGSUSED */ 142 static int 143 sys_enterclass(t, cid, parmsp, reqpcredp, bufp) 144 kthread_id_t t; 145 id_t cid; 146 void *parmsp; 147 cred_t *reqpcredp; 148 void *bufp; 149 { 150 return (0); 151 } 152 153 /* ARGSUSED */ 154 static int 155 sys_canexit(kthread_id_t t, cred_t *reqpcredp) 156 { 157 return (0); 158 } 159 160 /* ARGSUSED */ 161 static int 162 sys_fork(t, ct, bufp) 163 kthread_id_t t; 164 kthread_id_t ct; 165 void *bufp; 166 { 167 /* 168 * No class specific data structure 169 */ 170 return (0); 171 } 172 173 174 /* ARGSUSED */ 175 static void 176 sys_forkret(t, ct) 177 kthread_id_t t; 178 kthread_id_t ct; 179 { 180 register proc_t *pp = ttoproc(t); 181 register proc_t *cp = ttoproc(ct); 182 183 ASSERT(t == curthread); 184 ASSERT(MUTEX_HELD(&pidlock)); 185 186 /* 187 * Grab the child's p_lock before dropping pidlock to ensure 188 * the process does not disappear before we set it running. 189 */ 190 mutex_enter(&cp->p_lock); 191 mutex_exit(&pidlock); 192 continuelwps(cp); 193 mutex_exit(&cp->p_lock); 194 195 mutex_enter(&pp->p_lock); 196 continuelwps(pp); 197 mutex_exit(&pp->p_lock); 198 } 199 200 /* ARGSUSED */ 201 static pri_t 202 sys_swappri(t, flags) 203 kthread_id_t t; 204 int flags; 205 { 206 return (-1); 207 } 208 209 static int 210 sys_nosys() 211 { 212 return (ENOSYS); 213 } 214 215 216 static void 217 sys_nullsys() 218 { 219 } 220 221 #ifdef KSLICE 222 static void 223 sys_preempt(t) 224 kthread_id_t t; 225 { 226 extern int kslice; 227 228 if (kslice) 229 setbackdq(t); 230 else 231 setfrontdq(t); 232 } 233 #endif 234 235 236 /* ARGSUSED */ 237 static int 238 sys_donice(t, cr, incr, retvalp) 239 kthread_id_t t; 240 cred_t *cr; 241 int incr; 242 int *retvalp; 243 { 244 return (EINVAL); 245 } 246 247 /* ARGSUSED */ 248 static int 249 sys_alloc(void **p, int flag) 250 { 251 *p = NULL; 252 return (0); 253 } 254