1 /* 2 * Copyright (c) 2003 Daniel M. Eischen <deischen@gdeb.com> 3 * Copyright (c) 2005, David Xu <davidxu@freebsd.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice unmodified, this list of conditions, and the following 11 * disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * 27 * $FreeBSD$ 28 */ 29 30 #include "namespace.h" 31 #include <sys/types.h> 32 #include <sys/rtprio.h> 33 #include <sys/signalvar.h> 34 #include <errno.h> 35 #include <stdlib.h> 36 #include <string.h> 37 #include <stddef.h> 38 #include <pthread.h> 39 #include "un-namespace.h" 40 41 #include "thr_private.h" 42 43 static int create_stack(struct pthread_attr *pattr); 44 static void thread_start(struct pthread *curthread); 45 46 __weak_reference(_pthread_create, pthread_create); 47 48 int 49 _pthread_create(pthread_t * thread, const pthread_attr_t * attr, 50 void *(*start_routine) (void *), void *arg) 51 { 52 struct pthread *curthread, *new_thread; 53 struct thr_param param; 54 struct sched_param sched_param; 55 struct rtprio rtp; 56 int ret = 0, locked, create_suspended; 57 sigset_t set, oset; 58 59 _thr_check_init(); 60 61 /* 62 * Tell libc and others now they need lock to protect their data. 63 */ 64 if (_thr_isthreaded() == 0 && _thr_setthreaded(1)) 65 return (EAGAIN); 66 67 curthread = _get_curthread(); 68 if ((new_thread = _thr_alloc(curthread)) == NULL) 69 return (EAGAIN); 70 71 memset(¶m, 0, sizeof(param)); 72 73 if (attr == NULL || *attr == NULL) 74 /* Use the default thread attributes: */ 75 new_thread->attr = _pthread_attr_default; 76 else 77 new_thread->attr = *(*attr); 78 if (new_thread->attr.sched_inherit == PTHREAD_INHERIT_SCHED) { 79 /* inherit scheduling contention scope */ 80 if (curthread->attr.flags & PTHREAD_SCOPE_SYSTEM) 81 new_thread->attr.flags |= PTHREAD_SCOPE_SYSTEM; 82 else 83 new_thread->attr.flags &= ~PTHREAD_SCOPE_SYSTEM; 84 85 new_thread->attr.prio = curthread->attr.prio; 86 new_thread->attr.sched_policy = curthread->attr.sched_policy; 87 } 88 89 if (_thr_scope_system > 0) 90 new_thread->attr.flags |= PTHREAD_SCOPE_SYSTEM; 91 else if (_thr_scope_system < 0) 92 new_thread->attr.flags &= ~PTHREAD_SCOPE_SYSTEM; 93 94 new_thread->tid = TID_TERMINATED; 95 96 if (create_stack(&new_thread->attr) != 0) { 97 /* Insufficient memory to create a stack: */ 98 _thr_free(curthread, new_thread); 99 return (EAGAIN); 100 } 101 /* 102 * Write a magic value to the thread structure 103 * to help identify valid ones: 104 */ 105 new_thread->magic = THR_MAGIC; 106 new_thread->start_routine = start_routine; 107 new_thread->arg = arg; 108 new_thread->cancelflags = PTHREAD_CANCEL_ENABLE | 109 PTHREAD_CANCEL_DEFERRED; 110 /* Initialize the mutex queue: */ 111 TAILQ_INIT(&new_thread->mutexq); 112 TAILQ_INIT(&new_thread->pp_mutexq); 113 114 /* Initialise hooks in the thread structure: */ 115 if (new_thread->attr.suspend == THR_CREATE_SUSPENDED) { 116 new_thread->flags = THR_FLAGS_NEED_SUSPEND; 117 create_suspended = 1; 118 } else { 119 create_suspended = 0; 120 } 121 122 new_thread->state = PS_RUNNING; 123 124 if (new_thread->attr.flags & PTHREAD_CREATE_DETACHED) 125 new_thread->tlflags |= TLFLAGS_DETACHED; 126 127 /* Add the new thread. */ 128 new_thread->refcount = 1; 129 _thr_link(curthread, new_thread); 130 /* Return thread pointer eariler so that new thread can use it. */ 131 (*thread) = new_thread; 132 if (SHOULD_REPORT_EVENT(curthread, TD_CREATE)) { 133 THR_THREAD_LOCK(curthread, new_thread); 134 locked = 1; 135 } else 136 locked = 0; 137 param.start_func = (void (*)(void *)) thread_start; 138 param.arg = new_thread; 139 param.stack_base = new_thread->attr.stackaddr_attr; 140 param.stack_size = new_thread->attr.stacksize_attr; 141 param.tls_base = (char *)new_thread->tcb; 142 param.tls_size = sizeof(struct tcb); 143 param.child_tid = &new_thread->tid; 144 param.parent_tid = &new_thread->tid; 145 param.flags = 0; 146 if (new_thread->attr.flags & PTHREAD_SCOPE_SYSTEM) 147 param.flags |= THR_SYSTEM_SCOPE; 148 if (new_thread->attr.sched_inherit == PTHREAD_INHERIT_SCHED) 149 param.rtp = NULL; 150 else { 151 sched_param.sched_priority = new_thread->attr.prio; 152 _schedparam_to_rtp(new_thread->attr.sched_policy, 153 &sched_param, &rtp); 154 param.rtp = &rtp; 155 } 156 157 /* Schedule the new thread. */ 158 if (create_suspended) { 159 SIGFILLSET(set); 160 SIGDELSET(set, SIGTRAP); 161 __sys_sigprocmask(SIG_SETMASK, &set, &oset); 162 new_thread->sigmask = oset; 163 } 164 165 ret = thr_new(¶m, sizeof(param)); 166 167 if (ret != 0) { 168 ret = errno; 169 /* 170 * Translate EPROCLIM into well-known POSIX code EAGAIN. 171 */ 172 if (ret == EPROCLIM) 173 ret = EAGAIN; 174 } 175 176 if (create_suspended) 177 __sys_sigprocmask(SIG_SETMASK, &oset, NULL); 178 179 if (ret != 0) { 180 if (!locked) 181 THR_THREAD_LOCK(curthread, new_thread); 182 new_thread->state = PS_DEAD; 183 new_thread->tid = TID_TERMINATED; 184 if (new_thread->flags & THR_FLAGS_NEED_SUSPEND) { 185 new_thread->cycle++; 186 _thr_umtx_wake(&new_thread->cycle, INT_MAX); 187 } 188 THR_THREAD_UNLOCK(curthread, new_thread); 189 THREAD_LIST_LOCK(curthread); 190 _thread_active_threads--; 191 new_thread->tlflags |= TLFLAGS_DETACHED; 192 _thr_ref_delete_unlocked(curthread, new_thread); 193 THREAD_LIST_UNLOCK(curthread); 194 (*thread) = 0; 195 } else if (locked) { 196 _thr_report_creation(curthread, new_thread); 197 THR_THREAD_UNLOCK(curthread, new_thread); 198 } 199 return (ret); 200 } 201 202 static int 203 create_stack(struct pthread_attr *pattr) 204 { 205 int ret; 206 207 /* Check if a stack was specified in the thread attributes: */ 208 if ((pattr->stackaddr_attr) != NULL) { 209 pattr->guardsize_attr = 0; 210 pattr->flags |= THR_STACK_USER; 211 ret = 0; 212 } 213 else 214 ret = _thr_stack_alloc(pattr); 215 return (ret); 216 } 217 218 static void 219 thread_start(struct pthread *curthread) 220 { 221 if (curthread->attr.suspend == THR_CREATE_SUSPENDED) { 222 sigset_t set = curthread->sigmask; 223 224 _thr_ast(curthread); 225 226 /* 227 * Parent thread have stored signal mask for us, 228 * we should restore it now. 229 */ 230 sigprocmask(SIG_SETMASK, &set, NULL); 231 } 232 233 /* 234 * This is used as a serialization point to allow parent 235 * to report 'new thread' event to debugger before the thread 236 * does real work. 237 */ 238 THR_LOCK(curthread); 239 THR_UNLOCK(curthread); 240 241 /* Run the current thread's start routine with argument: */ 242 _pthread_exit(curthread->start_routine(curthread->arg)); 243 244 /* This point should never be reached. */ 245 PANIC("Thread has resumed after exit"); 246 } 247