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 2006 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include "lint.h" 30 #include "thr_uberdata.h" 31 32 /* 33 * pthread_once related data 34 * This structure is exported as pthread_once_t in pthread.h. 35 * We export only the size of this structure. so check 36 * pthread_once_t in pthread.h before making a change here. 37 */ 38 typedef struct __once { 39 mutex_t mlock; 40 union { 41 uint32_t pad32_flag[2]; 42 uint64_t pad64_flag; 43 } oflag; 44 } __once_t; 45 46 #define once_flag oflag.pad32_flag[1] 47 48 /* 49 * pthread_create: creates a thread in the current process. 50 * calls common _thrp_create() after copying the attributes. 51 */ 52 #pragma weak pthread_create = _pthread_create 53 int 54 _pthread_create(pthread_t *thread, const pthread_attr_t *attr, 55 void * (*start_routine)(void *), void *arg) 56 { 57 ulwp_t *self = curthread; 58 uberdata_t *udp = self->ul_uberdata; 59 const thrattr_t *ap = attr? attr->__pthread_attrp : def_thrattr(); 60 long flag; 61 pthread_t tid; 62 int policy; 63 pri_t priority; 64 int error; 65 int mapped = 0; 66 int mappedpri; 67 int rt = 0; 68 69 if (ap == NULL) 70 return (EINVAL); 71 72 if (ap->inherit == PTHREAD_INHERIT_SCHED) { 73 policy = self->ul_policy; 74 priority = self->ul_pri; 75 mapped = self->ul_pri_mapped; 76 mappedpri = self->ul_mappedpri; 77 } else { 78 policy = ap->policy; 79 priority = ap->prio; 80 if (policy == SCHED_OTHER) { 81 if (priority < THREAD_MIN_PRIORITY || 82 priority > THREAD_MAX_PRIORITY) { 83 if (_validate_rt_prio(policy, priority)) 84 return (EINVAL); 85 mapped = 1; 86 mappedpri = priority; 87 priority = map_rtpri_to_gp(priority); 88 ASSERT(priority >= THREAD_MIN_PRIORITY && 89 priority <= THREAD_MAX_PRIORITY); 90 } 91 } else if (policy == SCHED_FIFO || policy == SCHED_RR) { 92 if (_validate_rt_prio(policy, priority)) 93 return (EINVAL); 94 if (_private_geteuid() == 0) 95 rt = 1; 96 } else { 97 return (EINVAL); 98 } 99 } 100 101 flag = ap->scope | ap->detachstate | ap->daemonstate | THR_SUSPENDED; 102 error = _thrp_create(ap->stkaddr, ap->stksize, start_routine, arg, 103 flag, &tid, priority, policy, ap->guardsize); 104 if (error == 0) { 105 if (mapped) { 106 ulwp_t *ulwp = find_lwp(tid); 107 ulwp->ul_pri_mapped = 1; 108 ulwp->ul_mappedpri = mappedpri; 109 ulwp_unlock(ulwp, udp); 110 } 111 if (rt && _thrp_setlwpprio(tid, policy, priority)) 112 thr_panic("_thrp_setlwpprio() failed"); 113 if (thread) 114 *thread = tid; 115 (void) _thr_continue(tid); 116 } 117 118 /* posix version expects EAGAIN for lack of memory */ 119 if (error == ENOMEM) 120 error = EAGAIN; 121 return (error); 122 } 123 124 /* 125 * pthread_once: calls given function only once. 126 * it synchronizes via mutex in pthread_once_t structure 127 */ 128 #pragma weak pthread_once = _pthread_once 129 int 130 _pthread_once(pthread_once_t *once_control, void (*init_routine)(void)) 131 { 132 __once_t *once = (__once_t *)once_control; 133 134 if (once == NULL || init_routine == NULL) 135 return (EINVAL); 136 137 if (once->once_flag == PTHREAD_ONCE_NOTDONE) { 138 (void) _private_mutex_lock(&once->mlock); 139 if (once->once_flag == PTHREAD_ONCE_NOTDONE) { 140 pthread_cleanup_push(_private_mutex_unlock, 141 &once->mlock); 142 (*init_routine)(); 143 pthread_cleanup_pop(0); 144 once->once_flag = PTHREAD_ONCE_DONE; 145 } 146 (void) _private_mutex_unlock(&once->mlock); 147 } 148 149 return (0); 150 } 151 152 /* 153 * pthread_equal: equates two thread ids. 154 */ 155 #pragma weak pthread_equal = _pthread_equal 156 int 157 _pthread_equal(pthread_t t1, pthread_t t2) 158 { 159 return (t1 == t2); 160 } 161 162 /* 163 * pthread_getschedparam: gets the sched parameters in a struct. 164 */ 165 #pragma weak pthread_getschedparam = _pthread_getschedparam 166 int 167 _pthread_getschedparam(pthread_t tid, int *policy, struct sched_param *param) 168 { 169 uberdata_t *udp = curthread->ul_uberdata; 170 ulwp_t *ulwp; 171 int error = 0; 172 173 if (param == NULL || policy == NULL) 174 error = EINVAL; 175 else if ((ulwp = find_lwp(tid)) == NULL) 176 error = ESRCH; 177 else { 178 if (ulwp->ul_pri_mapped) 179 param->sched_priority = ulwp->ul_mappedpri; 180 else 181 param->sched_priority = ulwp->ul_pri; 182 *policy = ulwp->ul_policy; 183 ulwp_unlock(ulwp, udp); 184 } 185 186 return (error); 187 } 188 189 /* 190 * Besides the obvious arguments, the inheritflag needs to be explained: 191 * If set to PRIO_SET or PRIO_SET_PRIO, it does the normal, expected work 192 * of setting thread's assigned scheduling parameters and policy. 193 * If set to PRIO_INHERIT, it sets the thread's effective priority values 194 * (t_epri, t_empappedpri), and does not update the assigned priority values 195 * (t_pri, t_mappedpri). If set to PRIO_DISINHERIT, it clears the thread's 196 * effective priority values, and reverts the thread, if necessary, back 197 * to the assigned priority values. 198 */ 199 int 200 _thread_setschedparam_main(pthread_t tid, int policy, 201 const struct sched_param *param, int inheritflag) 202 { 203 uberdata_t *udp = curthread->ul_uberdata; 204 ulwp_t *ulwp; 205 int error = 0; 206 int prio; 207 int opolicy; 208 int mappedprio; 209 int mapped = 0; 210 pri_t *mappedprip; 211 212 if (param == NULL) 213 return (EINVAL); 214 if ((ulwp = find_lwp(tid)) == NULL) 215 return (ESRCH); 216 prio = param->sched_priority; 217 opolicy = ulwp->ul_policy; 218 if (inheritflag == PRIO_SET_PRIO) { /* don't change policy */ 219 policy = opolicy; 220 inheritflag = PRIO_SET; 221 } 222 ASSERT(inheritflag == PRIO_SET || opolicy == policy); 223 if (inheritflag == PRIO_DISINHERIT) { 224 ulwp->ul_emappedpri = 0; 225 ulwp->ul_epri = 0; 226 prio = ulwp->ul_pri; /* ignore prio in sched_param */ 227 } 228 if (policy == SCHED_OTHER) { 229 /* 230 * Set thread's policy to OTHER 231 */ 232 if (prio < THREAD_MIN_PRIORITY || prio > THREAD_MAX_PRIORITY) { 233 if (_validate_rt_prio(policy, prio)) { 234 error = EINVAL; 235 goto out; 236 } 237 mapped = 1; 238 mappedprio = prio; 239 prio = map_rtpri_to_gp(prio); 240 ASSERT(prio >= THREAD_MIN_PRIORITY && 241 prio <= THREAD_MAX_PRIORITY); 242 } 243 /* 244 * Thread changing from FIFO/RR to OTHER 245 */ 246 if (opolicy == SCHED_FIFO || opolicy == SCHED_RR) { 247 if ((error = _thrp_setlwpprio(tid, policy, prio)) != 0) 248 goto out; 249 } 250 if (inheritflag != PRIO_DISINHERIT) { 251 if (inheritflag == PRIO_INHERIT) 252 mappedprip = &ulwp->ul_emappedpri; 253 else 254 mappedprip = &ulwp->ul_mappedpri; 255 if (mapped) { 256 ulwp->ul_pri_mapped = 1; 257 *mappedprip = mappedprio; 258 } else { 259 ulwp->ul_pri_mapped = 0; 260 *mappedprip = 0; 261 } 262 } 263 ulwp->ul_policy = policy; 264 if (inheritflag == PRIO_INHERIT) 265 ulwp->ul_epri = prio; 266 else 267 ulwp->ul_pri = prio; 268 } else if (policy == SCHED_FIFO || policy == SCHED_RR) { 269 if (_validate_rt_prio(policy, prio)) 270 error = EINVAL; 271 else { 272 if (_private_geteuid() == 0 && 273 _thrp_setlwpprio(tid, policy, prio)) 274 thr_panic("_thrp_setlwpprio failed"); 275 ulwp->ul_policy = policy; 276 if (inheritflag == PRIO_INHERIT) 277 ulwp->ul_epri = prio; 278 else 279 ulwp->ul_pri = prio; 280 } 281 } else { 282 error = EINVAL; 283 } 284 285 out: 286 ulwp_unlock(ulwp, udp); 287 return (error); 288 } 289 290 /* 291 * pthread_setschedparam: sets the sched parameters for a thread. 292 */ 293 #pragma weak pthread_setschedparam = _pthread_setschedparam 294 int 295 _pthread_setschedparam(pthread_t tid, 296 int policy, const struct sched_param *param) 297 { 298 return (_thread_setschedparam_main(tid, policy, param, PRIO_SET)); 299 } 300