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 <pthread_np.h> 40 #include "un-namespace.h" 41 42 #include "thr_private.h" 43 44 static int create_stack(struct pthread_attr *pattr); 45 static void thread_start(struct pthread *curthread); 46 47 __weak_reference(_pthread_create, pthread_create); 48 49 int 50 _pthread_create(pthread_t * thread, const pthread_attr_t * attr, 51 void *(*start_routine) (void *), void *arg) 52 { 53 struct pthread *curthread, *new_thread; 54 struct thr_param param; 55 struct sched_param sched_param; 56 struct rtprio rtp; 57 int ret = 0, locked, create_suspended; 58 sigset_t set, oset; 59 cpuset_t *cpusetp = NULL; 60 int cpusetsize = 0; 61 62 _thr_check_init(); 63 64 /* 65 * Tell libc and others now they need lock to protect their data. 66 */ 67 if (_thr_isthreaded() == 0 && _thr_setthreaded(1)) 68 return (EAGAIN); 69 70 curthread = _get_curthread(); 71 if ((new_thread = _thr_alloc(curthread)) == NULL) 72 return (EAGAIN); 73 74 memset(¶m, 0, sizeof(param)); 75 76 if (attr == NULL || *attr == NULL) 77 /* Use the default thread attributes: */ 78 new_thread->attr = _pthread_attr_default; 79 else { 80 new_thread->attr = *(*attr); 81 cpusetp = new_thread->attr.cpuset; 82 cpusetsize = new_thread->attr.cpusetsize; 83 new_thread->attr.cpuset = NULL; 84 new_thread->attr.cpusetsize = 0; 85 } 86 if (new_thread->attr.sched_inherit == PTHREAD_INHERIT_SCHED) { 87 /* inherit scheduling contention scope */ 88 if (curthread->attr.flags & PTHREAD_SCOPE_SYSTEM) 89 new_thread->attr.flags |= PTHREAD_SCOPE_SYSTEM; 90 else 91 new_thread->attr.flags &= ~PTHREAD_SCOPE_SYSTEM; 92 93 new_thread->attr.prio = curthread->attr.prio; 94 new_thread->attr.sched_policy = curthread->attr.sched_policy; 95 } 96 97 new_thread->tid = TID_TERMINATED; 98 99 if (create_stack(&new_thread->attr) != 0) { 100 /* Insufficient memory to create a stack: */ 101 _thr_free(curthread, new_thread); 102 return (EAGAIN); 103 } 104 /* 105 * Write a magic value to the thread structure 106 * to help identify valid ones: 107 */ 108 new_thread->magic = THR_MAGIC; 109 new_thread->start_routine = start_routine; 110 new_thread->arg = arg; 111 new_thread->cancel_enable = 1; 112 new_thread->cancel_async = 0; 113 /* Initialize the mutex queue: */ 114 TAILQ_INIT(&new_thread->mutexq); 115 TAILQ_INIT(&new_thread->pp_mutexq); 116 117 /* Initialise hooks in the thread structure: */ 118 if (new_thread->attr.suspend == THR_CREATE_SUSPENDED) { 119 new_thread->flags = THR_FLAGS_NEED_SUSPEND; 120 create_suspended = 1; 121 } else { 122 create_suspended = 0; 123 } 124 125 new_thread->state = PS_RUNNING; 126 127 if (new_thread->attr.flags & PTHREAD_CREATE_DETACHED) 128 new_thread->tlflags |= TLFLAGS_DETACHED; 129 130 if (curthread->in_sigcancel_handler) 131 new_thread->unblock_sigcancel = 1; 132 else 133 new_thread->unblock_sigcancel = 0; 134 135 /* Add the new thread. */ 136 new_thread->refcount = 1; 137 _thr_link(curthread, new_thread); 138 /* Return thread pointer eariler so that new thread can use it. */ 139 (*thread) = new_thread; 140 if (SHOULD_REPORT_EVENT(curthread, TD_CREATE) || cpusetp != NULL) { 141 THR_THREAD_LOCK(curthread, new_thread); 142 locked = 1; 143 } else 144 locked = 0; 145 param.start_func = (void (*)(void *)) thread_start; 146 param.arg = new_thread; 147 param.stack_base = new_thread->attr.stackaddr_attr; 148 param.stack_size = new_thread->attr.stacksize_attr; 149 param.tls_base = (char *)new_thread->tcb; 150 param.tls_size = sizeof(struct tcb); 151 param.child_tid = &new_thread->tid; 152 param.parent_tid = &new_thread->tid; 153 param.flags = 0; 154 if (new_thread->attr.flags & PTHREAD_SCOPE_SYSTEM) 155 param.flags |= THR_SYSTEM_SCOPE; 156 if (new_thread->attr.sched_inherit == PTHREAD_INHERIT_SCHED) 157 param.rtp = NULL; 158 else { 159 sched_param.sched_priority = new_thread->attr.prio; 160 _schedparam_to_rtp(new_thread->attr.sched_policy, 161 &sched_param, &rtp); 162 param.rtp = &rtp; 163 } 164 165 /* Schedule the new thread. */ 166 if (create_suspended) { 167 SIGFILLSET(set); 168 SIGDELSET(set, SIGTRAP); 169 __sys_sigprocmask(SIG_SETMASK, &set, &oset); 170 new_thread->sigmask = oset; 171 SIGDELSET(new_thread->sigmask, SIGCANCEL); 172 } 173 174 ret = thr_new(¶m, sizeof(param)); 175 176 if (ret != 0) { 177 ret = errno; 178 /* 179 * Translate EPROCLIM into well-known POSIX code EAGAIN. 180 */ 181 if (ret == EPROCLIM) 182 ret = EAGAIN; 183 } 184 185 if (create_suspended) 186 __sys_sigprocmask(SIG_SETMASK, &oset, NULL); 187 188 if (ret != 0) { 189 if (!locked) 190 THR_THREAD_LOCK(curthread, new_thread); 191 new_thread->state = PS_DEAD; 192 new_thread->tid = TID_TERMINATED; 193 if (new_thread->flags & THR_FLAGS_NEED_SUSPEND) { 194 new_thread->cycle++; 195 _thr_umtx_wake(&new_thread->cycle, INT_MAX); 196 } 197 THR_THREAD_UNLOCK(curthread, new_thread); 198 THREAD_LIST_LOCK(curthread); 199 _thread_active_threads--; 200 new_thread->tlflags |= TLFLAGS_DETACHED; 201 _thr_ref_delete_unlocked(curthread, new_thread); 202 THREAD_LIST_UNLOCK(curthread); 203 } else if (locked) { 204 if (cpusetp != NULL) { 205 if (cpuset_setaffinity(CPU_LEVEL_WHICH, CPU_WHICH_TID, 206 TID(new_thread), cpusetsize, cpusetp)) { 207 ret = errno; 208 /* kill the new thread */ 209 new_thread->force_exit = 1; 210 THR_THREAD_UNLOCK(curthread, new_thread); 211 goto out; 212 } 213 } 214 215 _thr_report_creation(curthread, new_thread); 216 THR_THREAD_UNLOCK(curthread, new_thread); 217 out: 218 if (ret) { 219 THREAD_LIST_LOCK(curthread); 220 new_thread->tlflags |= TLFLAGS_DETACHED; 221 THR_GCLIST_ADD(new_thread); 222 THREAD_LIST_UNLOCK(curthread); 223 } 224 } 225 226 if (ret) 227 (*thread) = 0; 228 return (ret); 229 } 230 231 static int 232 create_stack(struct pthread_attr *pattr) 233 { 234 int ret; 235 236 /* Check if a stack was specified in the thread attributes: */ 237 if ((pattr->stackaddr_attr) != NULL) { 238 pattr->guardsize_attr = 0; 239 pattr->flags |= THR_STACK_USER; 240 ret = 0; 241 } 242 else 243 ret = _thr_stack_alloc(pattr); 244 return (ret); 245 } 246 247 static void 248 thread_start(struct pthread *curthread) 249 { 250 sigset_t set; 251 252 if (curthread->attr.suspend == THR_CREATE_SUSPENDED) 253 set = curthread->sigmask; 254 255 /* 256 * This is used as a serialization point to allow parent 257 * to report 'new thread' event to debugger or tweak new thread's 258 * attributes before the new thread does real-world work. 259 */ 260 THR_LOCK(curthread); 261 THR_UNLOCK(curthread); 262 263 if (curthread->force_exit) 264 _pthread_exit(PTHREAD_CANCELED); 265 266 if (curthread->unblock_sigcancel) { 267 sigset_t set1; 268 269 SIGEMPTYSET(set1); 270 SIGADDSET(set1, SIGCANCEL); 271 __sys_sigprocmask(SIG_UNBLOCK, &set1, NULL); 272 } 273 274 if (curthread->attr.suspend == THR_CREATE_SUSPENDED) { 275 #if 0 276 /* Done in THR_UNLOCK() */ 277 _thr_ast(curthread); 278 #endif 279 280 /* 281 * Parent thread have stored signal mask for us, 282 * we should restore it now. 283 */ 284 __sys_sigprocmask(SIG_SETMASK, &set, NULL); 285 } 286 287 /* Run the current thread's start routine with argument: */ 288 _pthread_exit(curthread->start_routine(curthread->arg)); 289 290 /* This point should never be reached. */ 291 PANIC("Thread has resumed after exit"); 292 } 293