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 */ 26*e56998eeSRobert Mustacchi /* 27*e56998eeSRobert Mustacchi * Copyright 2016 Joyent, Inc. 28*e56998eeSRobert Mustacchi */ 297c478bd9Sstevel@tonic-gate 307c478bd9Sstevel@tonic-gate #include "lint.h" 317c478bd9Sstevel@tonic-gate #include "thr_uberdata.h" 327c478bd9Sstevel@tonic-gate 337c478bd9Sstevel@tonic-gate /* 347c478bd9Sstevel@tonic-gate * pthread_once related data 357c478bd9Sstevel@tonic-gate * This structure is exported as pthread_once_t in pthread.h. 367c478bd9Sstevel@tonic-gate * We export only the size of this structure. so check 377c478bd9Sstevel@tonic-gate * pthread_once_t in pthread.h before making a change here. 387c478bd9Sstevel@tonic-gate */ 397c478bd9Sstevel@tonic-gate typedef struct __once { 407c478bd9Sstevel@tonic-gate mutex_t mlock; 417c478bd9Sstevel@tonic-gate union { 427c478bd9Sstevel@tonic-gate uint32_t pad32_flag[2]; 437c478bd9Sstevel@tonic-gate uint64_t pad64_flag; 447c478bd9Sstevel@tonic-gate } oflag; 457c478bd9Sstevel@tonic-gate } __once_t; 467c478bd9Sstevel@tonic-gate 477c478bd9Sstevel@tonic-gate #define once_flag oflag.pad32_flag[1] 487c478bd9Sstevel@tonic-gate 49*e56998eeSRobert Mustacchi static int 50*e56998eeSRobert Mustacchi _thr_setinherit(pthread_t tid, int inherit) 51*e56998eeSRobert Mustacchi { 52*e56998eeSRobert Mustacchi ulwp_t *ulwp; 53*e56998eeSRobert Mustacchi int error = 0; 54*e56998eeSRobert Mustacchi 55*e56998eeSRobert Mustacchi if ((ulwp = find_lwp(tid)) == NULL) { 56*e56998eeSRobert Mustacchi error = ESRCH; 57*e56998eeSRobert Mustacchi } else { 58*e56998eeSRobert Mustacchi ulwp->ul_ptinherit = inherit; 59*e56998eeSRobert Mustacchi ulwp_unlock(ulwp, curthread->ul_uberdata); 60*e56998eeSRobert Mustacchi } 61*e56998eeSRobert Mustacchi 62*e56998eeSRobert Mustacchi return (error); 63*e56998eeSRobert Mustacchi } 64*e56998eeSRobert Mustacchi 65d4204c85Sraf static int 66d4204c85Sraf _thr_setparam(pthread_t tid, int policy, int prio) 67d4204c85Sraf { 68d4204c85Sraf ulwp_t *ulwp; 69d4204c85Sraf id_t cid; 70d4204c85Sraf int error = 0; 71d4204c85Sraf 72d4204c85Sraf if ((ulwp = find_lwp(tid)) == NULL) { 73d4204c85Sraf error = ESRCH; 74d4204c85Sraf } else { 75d4204c85Sraf if (policy == ulwp->ul_policy && 76d4204c85Sraf (policy == SCHED_FIFO || policy == SCHED_RR) && 77d4204c85Sraf ulwp->ul_epri != 0) { 78d4204c85Sraf /* 79d4204c85Sraf * Don't change the ceiling priority, 80d4204c85Sraf * just the base priority. 81d4204c85Sraf */ 82d4204c85Sraf if (prio > ulwp->ul_epri) 83d4204c85Sraf error = EPERM; 84d4204c85Sraf else 85d4204c85Sraf ulwp->ul_pri = prio; 86d4204c85Sraf } else if ((cid = setparam(P_LWPID, tid, policy, prio)) == -1) { 87d4204c85Sraf error = errno; 88d4204c85Sraf } else { 89e84487aeSraf if (policy == SCHED_FIFO || policy == SCHED_RR) 90e84487aeSraf ulwp->ul_rtclassid = cid; 91d4204c85Sraf ulwp->ul_cid = cid; 92d4204c85Sraf ulwp->ul_pri = prio; 937257d1b4Sraf membar_producer(); 94d4204c85Sraf ulwp->ul_policy = policy; 95d4204c85Sraf } 96d4204c85Sraf ulwp_unlock(ulwp, curthread->ul_uberdata); 97d4204c85Sraf } 98d4204c85Sraf return (error); 99d4204c85Sraf } 100d4204c85Sraf 1017c478bd9Sstevel@tonic-gate /* 1027c478bd9Sstevel@tonic-gate * pthread_create: creates a thread in the current process. 1037c478bd9Sstevel@tonic-gate * calls common _thrp_create() after copying the attributes. 1047c478bd9Sstevel@tonic-gate */ 1057257d1b4Sraf #pragma weak _pthread_create = pthread_create 1067c478bd9Sstevel@tonic-gate int 1077257d1b4Sraf pthread_create(pthread_t *thread, const pthread_attr_t *attr, 108*e56998eeSRobert Mustacchi void * (*start_routine)(void *), void *arg) 1097c478bd9Sstevel@tonic-gate { 1107c478bd9Sstevel@tonic-gate ulwp_t *self = curthread; 11134709573Sraf const thrattr_t *ap = attr? attr->__pthread_attrp : def_thrattr(); 112d4204c85Sraf const pcclass_t *pccp; 1137c478bd9Sstevel@tonic-gate long flag; 1147c478bd9Sstevel@tonic-gate pthread_t tid; 1157c478bd9Sstevel@tonic-gate int error; 116d4204c85Sraf 117d4204c85Sraf update_sched(self); 1187c478bd9Sstevel@tonic-gate 11934709573Sraf if (ap == NULL) 1207c478bd9Sstevel@tonic-gate return (EINVAL); 1217c478bd9Sstevel@tonic-gate 122d4204c85Sraf /* validate explicit scheduling attributes */ 123d4204c85Sraf if (ap->inherit == PTHREAD_EXPLICIT_SCHED && 124d4204c85Sraf (ap->policy == SCHED_SYS || 125d4204c85Sraf (pccp = get_info_by_policy(ap->policy)) == NULL || 126d4204c85Sraf ap->prio < pccp->pcc_primin || ap->prio > pccp->pcc_primax)) 127d4204c85Sraf return (EINVAL); 1287c478bd9Sstevel@tonic-gate 12934709573Sraf flag = ap->scope | ap->detachstate | ap->daemonstate | THR_SUSPENDED; 1307c478bd9Sstevel@tonic-gate error = _thrp_create(ap->stkaddr, ap->stksize, start_routine, arg, 131d4204c85Sraf flag, &tid, ap->guardsize); 1327c478bd9Sstevel@tonic-gate if (error == 0) { 133*e56998eeSRobert Mustacchi /* 134*e56998eeSRobert Mustacchi * Record the original inheritence value for 135*e56998eeSRobert Mustacchi * pthread_getattr_np(). We should always be able to find the 136*e56998eeSRobert Mustacchi * thread. 137*e56998eeSRobert Mustacchi */ 138*e56998eeSRobert Mustacchi (void) _thr_setinherit(tid, ap->inherit); 139*e56998eeSRobert Mustacchi 140d4204c85Sraf if (ap->inherit == PTHREAD_EXPLICIT_SCHED && 141d4204c85Sraf (ap->policy != self->ul_policy || 142*e56998eeSRobert Mustacchi ap->prio != (self->ul_epri ? self->ul_epri : 143*e56998eeSRobert Mustacchi self->ul_pri))) { 144d4204c85Sraf /* 145d4204c85Sraf * The SUSv3 specification requires pthread_create() 146d4204c85Sraf * to fail with EPERM if it cannot set the scheduling 147d4204c85Sraf * policy and parameters on the new thread. 148d4204c85Sraf */ 149d4204c85Sraf error = _thr_setparam(tid, ap->policy, ap->prio); 150*e56998eeSRobert Mustacchi } 151*e56998eeSRobert Mustacchi 152d4204c85Sraf if (error) { 153d4204c85Sraf /* 154d4204c85Sraf * We couldn't determine this error before 155d4204c85Sraf * actually creating the thread. To recover, 156d4204c85Sraf * mark the thread detached and cancel it. 157d4204c85Sraf * It is as though it was never created. 158d4204c85Sraf */ 1597c478bd9Sstevel@tonic-gate ulwp_t *ulwp = find_lwp(tid); 160d4204c85Sraf if (ulwp->ul_detached == 0) { 161d4204c85Sraf ulwp->ul_detached = 1; 162d4204c85Sraf ulwp->ul_usropts |= THR_DETACHED; 163d4204c85Sraf (void) __lwp_detach(tid); 164d4204c85Sraf } 165d4204c85Sraf ulwp->ul_cancel_pending = 2; /* cancelled on creation */ 166d4204c85Sraf ulwp->ul_cancel_disabled = 0; 167d4204c85Sraf ulwp_unlock(ulwp, self->ul_uberdata); 168d4204c85Sraf } else if (thread) { 1697c478bd9Sstevel@tonic-gate *thread = tid; 170d4204c85Sraf } 1717257d1b4Sraf (void) thr_continue(tid); 1727c478bd9Sstevel@tonic-gate } 1737c478bd9Sstevel@tonic-gate 1747c478bd9Sstevel@tonic-gate /* posix version expects EAGAIN for lack of memory */ 1757c478bd9Sstevel@tonic-gate if (error == ENOMEM) 1767c478bd9Sstevel@tonic-gate error = EAGAIN; 1777c478bd9Sstevel@tonic-gate return (error); 1787c478bd9Sstevel@tonic-gate } 1797c478bd9Sstevel@tonic-gate 1807c478bd9Sstevel@tonic-gate /* 1817c478bd9Sstevel@tonic-gate * pthread_once: calls given function only once. 1827c478bd9Sstevel@tonic-gate * it synchronizes via mutex in pthread_once_t structure 1837c478bd9Sstevel@tonic-gate */ 1847c478bd9Sstevel@tonic-gate int 1857257d1b4Sraf pthread_once(pthread_once_t *once_control, void (*init_routine)(void)) 1867c478bd9Sstevel@tonic-gate { 1877c478bd9Sstevel@tonic-gate __once_t *once = (__once_t *)once_control; 1887c478bd9Sstevel@tonic-gate 1897c478bd9Sstevel@tonic-gate if (once == NULL || init_routine == NULL) 1907c478bd9Sstevel@tonic-gate return (EINVAL); 1917c478bd9Sstevel@tonic-gate 1927c478bd9Sstevel@tonic-gate if (once->once_flag == PTHREAD_ONCE_NOTDONE) { 1938cd45542Sraf (void) mutex_lock(&once->mlock); 1947c478bd9Sstevel@tonic-gate if (once->once_flag == PTHREAD_ONCE_NOTDONE) { 1958cd45542Sraf pthread_cleanup_push(mutex_unlock, &once->mlock); 1967c478bd9Sstevel@tonic-gate (*init_routine)(); 1977c478bd9Sstevel@tonic-gate pthread_cleanup_pop(0); 1987257d1b4Sraf membar_producer(); 1997c478bd9Sstevel@tonic-gate once->once_flag = PTHREAD_ONCE_DONE; 2007c478bd9Sstevel@tonic-gate } 2018cd45542Sraf (void) mutex_unlock(&once->mlock); 2027c478bd9Sstevel@tonic-gate } 2037257d1b4Sraf membar_consumer(); 2047c478bd9Sstevel@tonic-gate 2057c478bd9Sstevel@tonic-gate return (0); 2067c478bd9Sstevel@tonic-gate } 2077c478bd9Sstevel@tonic-gate 2087c478bd9Sstevel@tonic-gate /* 2097c478bd9Sstevel@tonic-gate * pthread_equal: equates two thread ids. 2107c478bd9Sstevel@tonic-gate */ 2117c478bd9Sstevel@tonic-gate int 2127257d1b4Sraf pthread_equal(pthread_t t1, pthread_t t2) 2137c478bd9Sstevel@tonic-gate { 2147c478bd9Sstevel@tonic-gate return (t1 == t2); 2157c478bd9Sstevel@tonic-gate } 2167c478bd9Sstevel@tonic-gate 2177c478bd9Sstevel@tonic-gate /* 218d4204c85Sraf * pthread_getschedparam: get the thread's sched parameters. 2197c478bd9Sstevel@tonic-gate */ 2207257d1b4Sraf #pragma weak _pthread_getschedparam = pthread_getschedparam 2217c478bd9Sstevel@tonic-gate int 2227257d1b4Sraf pthread_getschedparam(pthread_t tid, int *policy, struct sched_param *param) 2237c478bd9Sstevel@tonic-gate { 2247c478bd9Sstevel@tonic-gate ulwp_t *ulwp; 225d4204c85Sraf id_t cid; 2267c478bd9Sstevel@tonic-gate int error = 0; 2277c478bd9Sstevel@tonic-gate 228d4204c85Sraf if ((ulwp = find_lwp(tid)) == NULL) { 2297c478bd9Sstevel@tonic-gate error = ESRCH; 230d4204c85Sraf } else { 231d4204c85Sraf cid = getparam(P_LWPID, ulwp->ul_lwpid, policy, param); 232d4204c85Sraf if (cid == -1) { 233d4204c85Sraf error = errno; 234d4204c85Sraf } else if (*policy == ulwp->ul_policy && cid == ulwp->ul_cid && 235d4204c85Sraf (*policy == SCHED_FIFO || *policy == SCHED_RR)) { 236d4204c85Sraf /* 237d4204c85Sraf * Return the defined priority, not the effective 238d4204c85Sraf * priority from priority ceiling mutexes. 239d4204c85Sraf */ 2407c478bd9Sstevel@tonic-gate param->sched_priority = ulwp->ul_pri; 241d4204c85Sraf } else { 242e84487aeSraf if (*policy == SCHED_FIFO || *policy == SCHED_RR) 243e84487aeSraf ulwp->ul_rtclassid = cid; 244d4204c85Sraf ulwp->ul_cid = cid; 245d4204c85Sraf ulwp->ul_pri = param->sched_priority; 2467257d1b4Sraf membar_producer(); 247d4204c85Sraf ulwp->ul_policy = *policy; 248d4204c85Sraf } 249d4204c85Sraf ulwp_unlock(ulwp, curthread->ul_uberdata); 2507c478bd9Sstevel@tonic-gate } 2517c478bd9Sstevel@tonic-gate 2527c478bd9Sstevel@tonic-gate return (error); 2537c478bd9Sstevel@tonic-gate } 2547c478bd9Sstevel@tonic-gate 2557257d1b4Sraf #pragma weak _thr_getprio = thr_getprio 2567c478bd9Sstevel@tonic-gate int 2577257d1b4Sraf thr_getprio(thread_t tid, int *priority) 2587c478bd9Sstevel@tonic-gate { 259d4204c85Sraf struct sched_param param; 260d4204c85Sraf int policy; 261d4204c85Sraf int error; 2629acbbeafSnn 2637257d1b4Sraf if ((error = pthread_getschedparam(tid, &policy, ¶m)) == 0) 264d4204c85Sraf *priority = param.sched_priority; 2657c478bd9Sstevel@tonic-gate return (error); 2667c478bd9Sstevel@tonic-gate } 2677c478bd9Sstevel@tonic-gate 2687c478bd9Sstevel@tonic-gate /* 2697c478bd9Sstevel@tonic-gate * pthread_setschedparam: sets the sched parameters for a thread. 2707c478bd9Sstevel@tonic-gate */ 2717c478bd9Sstevel@tonic-gate int 2727257d1b4Sraf pthread_setschedparam(pthread_t tid, 273*e56998eeSRobert Mustacchi int policy, const struct sched_param *param) 2747c478bd9Sstevel@tonic-gate { 275d4204c85Sraf return (_thr_setparam(tid, policy, param->sched_priority)); 276d4204c85Sraf } 277d4204c85Sraf 2787257d1b4Sraf #pragma weak pthread_setschedprio = thr_setprio 279d4204c85Sraf int 2807257d1b4Sraf thr_setprio(thread_t tid, int prio) 281d4204c85Sraf { 282d4204c85Sraf struct sched_param param; 283d4204c85Sraf int policy; 284d4204c85Sraf int error; 285d4204c85Sraf 286d4204c85Sraf /* 2877257d1b4Sraf * pthread_getschedparam() has the side-effect of setting 288d4204c85Sraf * the target thread's ul_policy, ul_pri and ul_cid correctly. 289d4204c85Sraf */ 2907257d1b4Sraf if ((error = pthread_getschedparam(tid, &policy, ¶m)) != 0) 291d4204c85Sraf return (error); 292d4204c85Sraf if (param.sched_priority == prio) /* no change */ 293d4204c85Sraf return (0); 294d4204c85Sraf return (_thr_setparam(tid, policy, prio)); 2957c478bd9Sstevel@tonic-gate } 296