17c478bd9Sstevel@tonic-gate /* 27c478bd9Sstevel@tonic-gate * CDDL HEADER START 37c478bd9Sstevel@tonic-gate * 47c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 534709573Sraf * Common Development and Distribution License (the "License"). 634709573Sraf * You may not use this file except in compliance with the License. 77c478bd9Sstevel@tonic-gate * 87c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 97c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 107c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 117c478bd9Sstevel@tonic-gate * and limitations under the License. 127c478bd9Sstevel@tonic-gate * 137c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 147c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 157c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 167c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 177c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 187c478bd9Sstevel@tonic-gate * 197c478bd9Sstevel@tonic-gate * CDDL HEADER END 207c478bd9Sstevel@tonic-gate */ 2134709573Sraf 227c478bd9Sstevel@tonic-gate /* 23d4204c85Sraf * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 247c478bd9Sstevel@tonic-gate * Use is subject to license terms. 257c478bd9Sstevel@tonic-gate */ 267c478bd9Sstevel@tonic-gate 277c478bd9Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 287c478bd9Sstevel@tonic-gate 297c478bd9Sstevel@tonic-gate #include "lint.h" 307c478bd9Sstevel@tonic-gate #include "thr_uberdata.h" 317c478bd9Sstevel@tonic-gate 327c478bd9Sstevel@tonic-gate /* 337c478bd9Sstevel@tonic-gate * pthread_once related data 347c478bd9Sstevel@tonic-gate * This structure is exported as pthread_once_t in pthread.h. 357c478bd9Sstevel@tonic-gate * We export only the size of this structure. so check 367c478bd9Sstevel@tonic-gate * pthread_once_t in pthread.h before making a change here. 377c478bd9Sstevel@tonic-gate */ 387c478bd9Sstevel@tonic-gate typedef struct __once { 397c478bd9Sstevel@tonic-gate mutex_t mlock; 407c478bd9Sstevel@tonic-gate union { 417c478bd9Sstevel@tonic-gate uint32_t pad32_flag[2]; 427c478bd9Sstevel@tonic-gate uint64_t pad64_flag; 437c478bd9Sstevel@tonic-gate } oflag; 447c478bd9Sstevel@tonic-gate } __once_t; 457c478bd9Sstevel@tonic-gate 467c478bd9Sstevel@tonic-gate #define once_flag oflag.pad32_flag[1] 477c478bd9Sstevel@tonic-gate 48d4204c85Sraf static int 49d4204c85Sraf _thr_setparam(pthread_t tid, int policy, int prio) 50d4204c85Sraf { 51d4204c85Sraf ulwp_t *ulwp; 52d4204c85Sraf id_t cid; 53d4204c85Sraf int error = 0; 54d4204c85Sraf 55d4204c85Sraf if ((ulwp = find_lwp(tid)) == NULL) { 56d4204c85Sraf error = ESRCH; 57d4204c85Sraf } else { 58d4204c85Sraf if (policy == ulwp->ul_policy && 59d4204c85Sraf (policy == SCHED_FIFO || policy == SCHED_RR) && 60d4204c85Sraf ulwp->ul_epri != 0) { 61d4204c85Sraf /* 62d4204c85Sraf * Don't change the ceiling priority, 63d4204c85Sraf * just the base priority. 64d4204c85Sraf */ 65d4204c85Sraf if (prio > ulwp->ul_epri) 66d4204c85Sraf error = EPERM; 67d4204c85Sraf else 68d4204c85Sraf ulwp->ul_pri = prio; 69d4204c85Sraf } else if ((cid = setparam(P_LWPID, tid, policy, prio)) == -1) { 70d4204c85Sraf error = errno; 71d4204c85Sraf } else { 72*e84487aeSraf if (policy == SCHED_FIFO || policy == SCHED_RR) 73*e84487aeSraf ulwp->ul_rtclassid = cid; 74d4204c85Sraf ulwp->ul_cid = cid; 75d4204c85Sraf ulwp->ul_pri = prio; 76d4204c85Sraf _membar_producer(); 77d4204c85Sraf ulwp->ul_policy = policy; 78d4204c85Sraf } 79d4204c85Sraf ulwp_unlock(ulwp, curthread->ul_uberdata); 80d4204c85Sraf } 81d4204c85Sraf return (error); 82d4204c85Sraf } 83d4204c85Sraf 847c478bd9Sstevel@tonic-gate /* 857c478bd9Sstevel@tonic-gate * pthread_create: creates a thread in the current process. 867c478bd9Sstevel@tonic-gate * calls common _thrp_create() after copying the attributes. 877c478bd9Sstevel@tonic-gate */ 887c478bd9Sstevel@tonic-gate #pragma weak pthread_create = _pthread_create 897c478bd9Sstevel@tonic-gate int 907c478bd9Sstevel@tonic-gate _pthread_create(pthread_t *thread, const pthread_attr_t *attr, 917c478bd9Sstevel@tonic-gate void * (*start_routine)(void *), void *arg) 927c478bd9Sstevel@tonic-gate { 937c478bd9Sstevel@tonic-gate ulwp_t *self = curthread; 9434709573Sraf const thrattr_t *ap = attr? attr->__pthread_attrp : def_thrattr(); 95d4204c85Sraf const pcclass_t *pccp; 967c478bd9Sstevel@tonic-gate long flag; 977c478bd9Sstevel@tonic-gate pthread_t tid; 987c478bd9Sstevel@tonic-gate int error; 99d4204c85Sraf 100d4204c85Sraf update_sched(self); 1017c478bd9Sstevel@tonic-gate 10234709573Sraf if (ap == NULL) 1037c478bd9Sstevel@tonic-gate return (EINVAL); 1047c478bd9Sstevel@tonic-gate 105d4204c85Sraf /* validate explicit scheduling attributes */ 106d4204c85Sraf if (ap->inherit == PTHREAD_EXPLICIT_SCHED && 107d4204c85Sraf (ap->policy == SCHED_SYS || 108d4204c85Sraf (pccp = get_info_by_policy(ap->policy)) == NULL || 109d4204c85Sraf ap->prio < pccp->pcc_primin || ap->prio > pccp->pcc_primax)) 110d4204c85Sraf return (EINVAL); 1117c478bd9Sstevel@tonic-gate 11234709573Sraf flag = ap->scope | ap->detachstate | ap->daemonstate | THR_SUSPENDED; 1137c478bd9Sstevel@tonic-gate error = _thrp_create(ap->stkaddr, ap->stksize, start_routine, arg, 114d4204c85Sraf flag, &tid, ap->guardsize); 1157c478bd9Sstevel@tonic-gate if (error == 0) { 116d4204c85Sraf if (ap->inherit == PTHREAD_EXPLICIT_SCHED && 117d4204c85Sraf (ap->policy != self->ul_policy || 118d4204c85Sraf ap->prio != (self->ul_epri? self->ul_epri : self->ul_pri))) 119d4204c85Sraf /* 120d4204c85Sraf * The SUSv3 specification requires pthread_create() 121d4204c85Sraf * to fail with EPERM if it cannot set the scheduling 122d4204c85Sraf * policy and parameters on the new thread. 123d4204c85Sraf */ 124d4204c85Sraf error = _thr_setparam(tid, ap->policy, ap->prio); 125d4204c85Sraf if (error) { 126d4204c85Sraf /* 127d4204c85Sraf * We couldn't determine this error before 128d4204c85Sraf * actually creating the thread. To recover, 129d4204c85Sraf * mark the thread detached and cancel it. 130d4204c85Sraf * It is as though it was never created. 131d4204c85Sraf */ 1327c478bd9Sstevel@tonic-gate ulwp_t *ulwp = find_lwp(tid); 133d4204c85Sraf if (ulwp->ul_detached == 0) { 134d4204c85Sraf ulwp->ul_detached = 1; 135d4204c85Sraf ulwp->ul_usropts |= THR_DETACHED; 136d4204c85Sraf (void) __lwp_detach(tid); 137d4204c85Sraf } 138d4204c85Sraf ulwp->ul_cancel_pending = 2; /* cancelled on creation */ 139d4204c85Sraf ulwp->ul_cancel_disabled = 0; 140d4204c85Sraf ulwp_unlock(ulwp, self->ul_uberdata); 141d4204c85Sraf } else if (thread) { 1427c478bd9Sstevel@tonic-gate *thread = tid; 143d4204c85Sraf } 1447c478bd9Sstevel@tonic-gate (void) _thr_continue(tid); 1457c478bd9Sstevel@tonic-gate } 1467c478bd9Sstevel@tonic-gate 1477c478bd9Sstevel@tonic-gate /* posix version expects EAGAIN for lack of memory */ 1487c478bd9Sstevel@tonic-gate if (error == ENOMEM) 1497c478bd9Sstevel@tonic-gate error = EAGAIN; 1507c478bd9Sstevel@tonic-gate return (error); 1517c478bd9Sstevel@tonic-gate } 1527c478bd9Sstevel@tonic-gate 1537c478bd9Sstevel@tonic-gate /* 1547c478bd9Sstevel@tonic-gate * pthread_once: calls given function only once. 1557c478bd9Sstevel@tonic-gate * it synchronizes via mutex in pthread_once_t structure 1567c478bd9Sstevel@tonic-gate */ 1577c478bd9Sstevel@tonic-gate #pragma weak pthread_once = _pthread_once 1587c478bd9Sstevel@tonic-gate int 1597c478bd9Sstevel@tonic-gate _pthread_once(pthread_once_t *once_control, void (*init_routine)(void)) 1607c478bd9Sstevel@tonic-gate { 1617c478bd9Sstevel@tonic-gate __once_t *once = (__once_t *)once_control; 1627c478bd9Sstevel@tonic-gate 1637c478bd9Sstevel@tonic-gate if (once == NULL || init_routine == NULL) 1647c478bd9Sstevel@tonic-gate return (EINVAL); 1657c478bd9Sstevel@tonic-gate 1667c478bd9Sstevel@tonic-gate if (once->once_flag == PTHREAD_ONCE_NOTDONE) { 1677c478bd9Sstevel@tonic-gate (void) _private_mutex_lock(&once->mlock); 1687c478bd9Sstevel@tonic-gate if (once->once_flag == PTHREAD_ONCE_NOTDONE) { 1697c478bd9Sstevel@tonic-gate pthread_cleanup_push(_private_mutex_unlock, 1707c478bd9Sstevel@tonic-gate &once->mlock); 1717c478bd9Sstevel@tonic-gate (*init_routine)(); 1727c478bd9Sstevel@tonic-gate pthread_cleanup_pop(0); 173cb620785Sraf _membar_producer(); 1747c478bd9Sstevel@tonic-gate once->once_flag = PTHREAD_ONCE_DONE; 1757c478bd9Sstevel@tonic-gate } 1767c478bd9Sstevel@tonic-gate (void) _private_mutex_unlock(&once->mlock); 1777c478bd9Sstevel@tonic-gate } 178cb620785Sraf _membar_consumer(); 1797c478bd9Sstevel@tonic-gate 1807c478bd9Sstevel@tonic-gate return (0); 1817c478bd9Sstevel@tonic-gate } 1827c478bd9Sstevel@tonic-gate 1837c478bd9Sstevel@tonic-gate /* 1847c478bd9Sstevel@tonic-gate * pthread_equal: equates two thread ids. 1857c478bd9Sstevel@tonic-gate */ 1867c478bd9Sstevel@tonic-gate #pragma weak pthread_equal = _pthread_equal 1877c478bd9Sstevel@tonic-gate int 1887c478bd9Sstevel@tonic-gate _pthread_equal(pthread_t t1, pthread_t t2) 1897c478bd9Sstevel@tonic-gate { 1907c478bd9Sstevel@tonic-gate return (t1 == t2); 1917c478bd9Sstevel@tonic-gate } 1927c478bd9Sstevel@tonic-gate 1937c478bd9Sstevel@tonic-gate /* 194d4204c85Sraf * pthread_getschedparam: get the thread's sched parameters. 1957c478bd9Sstevel@tonic-gate */ 1967c478bd9Sstevel@tonic-gate #pragma weak pthread_getschedparam = _pthread_getschedparam 1977c478bd9Sstevel@tonic-gate int 1987c478bd9Sstevel@tonic-gate _pthread_getschedparam(pthread_t tid, int *policy, struct sched_param *param) 1997c478bd9Sstevel@tonic-gate { 2007c478bd9Sstevel@tonic-gate ulwp_t *ulwp; 201d4204c85Sraf id_t cid; 2027c478bd9Sstevel@tonic-gate int error = 0; 2037c478bd9Sstevel@tonic-gate 204d4204c85Sraf if ((ulwp = find_lwp(tid)) == NULL) { 2057c478bd9Sstevel@tonic-gate error = ESRCH; 206d4204c85Sraf } else { 207d4204c85Sraf cid = getparam(P_LWPID, ulwp->ul_lwpid, policy, param); 208d4204c85Sraf if (cid == -1) { 209d4204c85Sraf error = errno; 210d4204c85Sraf } else if (*policy == ulwp->ul_policy && cid == ulwp->ul_cid && 211d4204c85Sraf (*policy == SCHED_FIFO || *policy == SCHED_RR)) { 212d4204c85Sraf /* 213d4204c85Sraf * Return the defined priority, not the effective 214d4204c85Sraf * priority from priority ceiling mutexes. 215d4204c85Sraf */ 2167c478bd9Sstevel@tonic-gate param->sched_priority = ulwp->ul_pri; 217d4204c85Sraf } else { 218*e84487aeSraf if (*policy == SCHED_FIFO || *policy == SCHED_RR) 219*e84487aeSraf ulwp->ul_rtclassid = cid; 220d4204c85Sraf ulwp->ul_cid = cid; 221d4204c85Sraf ulwp->ul_pri = param->sched_priority; 222d4204c85Sraf _membar_producer(); 223d4204c85Sraf ulwp->ul_policy = *policy; 224d4204c85Sraf } 225d4204c85Sraf ulwp_unlock(ulwp, curthread->ul_uberdata); 2267c478bd9Sstevel@tonic-gate } 2277c478bd9Sstevel@tonic-gate 2287c478bd9Sstevel@tonic-gate return (error); 2297c478bd9Sstevel@tonic-gate } 2307c478bd9Sstevel@tonic-gate 231d4204c85Sraf #pragma weak thr_getprio = _thr_getprio 2327c478bd9Sstevel@tonic-gate int 233d4204c85Sraf _thr_getprio(thread_t tid, int *priority) 2347c478bd9Sstevel@tonic-gate { 235d4204c85Sraf struct sched_param param; 236d4204c85Sraf int policy; 237d4204c85Sraf int error; 2389acbbeafSnn 239d4204c85Sraf if ((error = _pthread_getschedparam(tid, &policy, ¶m)) == 0) 240d4204c85Sraf *priority = param.sched_priority; 2417c478bd9Sstevel@tonic-gate return (error); 2427c478bd9Sstevel@tonic-gate } 2437c478bd9Sstevel@tonic-gate 2447c478bd9Sstevel@tonic-gate /* 2457c478bd9Sstevel@tonic-gate * pthread_setschedparam: sets the sched parameters for a thread. 2467c478bd9Sstevel@tonic-gate */ 2477c478bd9Sstevel@tonic-gate #pragma weak pthread_setschedparam = _pthread_setschedparam 2487c478bd9Sstevel@tonic-gate int 2497c478bd9Sstevel@tonic-gate _pthread_setschedparam(pthread_t tid, 2507c478bd9Sstevel@tonic-gate int policy, const struct sched_param *param) 2517c478bd9Sstevel@tonic-gate { 252d4204c85Sraf return (_thr_setparam(tid, policy, param->sched_priority)); 253d4204c85Sraf } 254d4204c85Sraf 255d4204c85Sraf #pragma weak thr_setprio = _thr_setprio 256d4204c85Sraf #pragma weak pthread_setschedprio = _thr_setprio 257d4204c85Sraf #pragma weak _pthread_setschedprio = _thr_setprio 258d4204c85Sraf int 259d4204c85Sraf _thr_setprio(thread_t tid, int prio) 260d4204c85Sraf { 261d4204c85Sraf struct sched_param param; 262d4204c85Sraf int policy; 263d4204c85Sraf int error; 264d4204c85Sraf 265d4204c85Sraf /* 266d4204c85Sraf * _pthread_getschedparam() has the side-effect of setting 267d4204c85Sraf * the target thread's ul_policy, ul_pri and ul_cid correctly. 268d4204c85Sraf */ 269d4204c85Sraf if ((error = _pthread_getschedparam(tid, &policy, ¶m)) != 0) 270d4204c85Sraf return (error); 271d4204c85Sraf if (param.sched_priority == prio) /* no change */ 272d4204c85Sraf return (0); 273d4204c85Sraf return (_thr_setparam(tid, policy, prio)); 2747c478bd9Sstevel@tonic-gate } 275