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 <link.h> 36 #include <stdlib.h> 37 #include <string.h> 38 #include <stddef.h> 39 #include <pthread.h> 40 #include <pthread_np.h> 41 #include "un-namespace.h" 42 43 #include "thr_private.h" 44 45 static int create_stack(struct pthread_attr *pattr); 46 static void thread_start(struct pthread *curthread); 47 48 __weak_reference(_pthread_create, pthread_create); 49 50 int 51 _pthread_create(pthread_t * thread, const pthread_attr_t * attr, 52 void *(*start_routine) (void *), void *arg) 53 { 54 struct pthread *curthread, *new_thread; 55 struct thr_param param; 56 struct sched_param sched_param; 57 struct rtprio rtp; 58 int ret = 0, locked, create_suspended; 59 sigset_t set, oset; 60 cpuset_t *cpusetp = NULL; 61 int cpusetsize = 0; 62 int old_stack_prot; 63 64 _thr_check_init(); 65 66 /* 67 * Tell libc and others now they need lock to protect their data. 68 */ 69 if (_thr_isthreaded() == 0 && _thr_setthreaded(1)) 70 return (EAGAIN); 71 72 curthread = _get_curthread(); 73 if ((new_thread = _thr_alloc(curthread)) == NULL) 74 return (EAGAIN); 75 76 memset(¶m, 0, sizeof(param)); 77 78 if (attr == NULL || *attr == NULL) 79 /* Use the default thread attributes: */ 80 new_thread->attr = _pthread_attr_default; 81 else { 82 new_thread->attr = *(*attr); 83 cpusetp = new_thread->attr.cpuset; 84 cpusetsize = new_thread->attr.cpusetsize; 85 new_thread->attr.cpuset = NULL; 86 new_thread->attr.cpusetsize = 0; 87 } 88 if (new_thread->attr.sched_inherit == PTHREAD_INHERIT_SCHED) { 89 /* inherit scheduling contention scope */ 90 if (curthread->attr.flags & PTHREAD_SCOPE_SYSTEM) 91 new_thread->attr.flags |= PTHREAD_SCOPE_SYSTEM; 92 else 93 new_thread->attr.flags &= ~PTHREAD_SCOPE_SYSTEM; 94 95 new_thread->attr.prio = curthread->attr.prio; 96 new_thread->attr.sched_policy = curthread->attr.sched_policy; 97 } 98 99 new_thread->tid = TID_TERMINATED; 100 101 old_stack_prot = _rtld_get_stack_prot(); 102 if (create_stack(&new_thread->attr) != 0) { 103 /* Insufficient memory to create a stack: */ 104 _thr_free(curthread, new_thread); 105 return (EAGAIN); 106 } 107 /* 108 * Write a magic value to the thread structure 109 * to help identify valid ones: 110 */ 111 new_thread->magic = THR_MAGIC; 112 new_thread->start_routine = start_routine; 113 new_thread->arg = arg; 114 new_thread->cancel_enable = 1; 115 new_thread->cancel_async = 0; 116 /* Initialize the mutex queue: */ 117 TAILQ_INIT(&new_thread->mutexq); 118 TAILQ_INIT(&new_thread->pp_mutexq); 119 120 /* Initialise hooks in the thread structure: */ 121 if (new_thread->attr.suspend == THR_CREATE_SUSPENDED) { 122 new_thread->flags = THR_FLAGS_NEED_SUSPEND; 123 create_suspended = 1; 124 } else { 125 create_suspended = 0; 126 } 127 128 new_thread->state = PS_RUNNING; 129 130 if (new_thread->attr.flags & PTHREAD_CREATE_DETACHED) 131 new_thread->flags |= THR_FLAGS_DETACHED; 132 133 /* Add the new thread. */ 134 new_thread->refcount = 1; 135 _thr_link(curthread, new_thread); 136 137 /* 138 * Handle the race between __pthread_map_stacks_exec and 139 * thread linkage. 140 */ 141 if (old_stack_prot != _rtld_get_stack_prot()) 142 _thr_stack_fix_protection(new_thread); 143 144 /* Return thread pointer eariler so that new thread can use it. */ 145 (*thread) = new_thread; 146 if (SHOULD_REPORT_EVENT(curthread, TD_CREATE) || cpusetp != NULL) { 147 THR_THREAD_LOCK(curthread, new_thread); 148 locked = 1; 149 } else 150 locked = 0; 151 param.start_func = (void (*)(void *)) thread_start; 152 param.arg = new_thread; 153 param.stack_base = new_thread->attr.stackaddr_attr; 154 param.stack_size = new_thread->attr.stacksize_attr; 155 param.tls_base = (char *)new_thread->tcb; 156 param.tls_size = sizeof(struct tcb); 157 param.child_tid = &new_thread->tid; 158 param.parent_tid = &new_thread->tid; 159 param.flags = 0; 160 if (new_thread->attr.flags & PTHREAD_SCOPE_SYSTEM) 161 param.flags |= THR_SYSTEM_SCOPE; 162 if (new_thread->attr.sched_inherit == PTHREAD_INHERIT_SCHED) 163 param.rtp = NULL; 164 else { 165 sched_param.sched_priority = new_thread->attr.prio; 166 _schedparam_to_rtp(new_thread->attr.sched_policy, 167 &sched_param, &rtp); 168 param.rtp = &rtp; 169 } 170 171 /* Schedule the new thread. */ 172 if (create_suspended) { 173 SIGFILLSET(set); 174 SIGDELSET(set, SIGTRAP); 175 __sys_sigprocmask(SIG_SETMASK, &set, &oset); 176 new_thread->sigmask = oset; 177 SIGDELSET(new_thread->sigmask, SIGCANCEL); 178 } 179 180 ret = thr_new(¶m, sizeof(param)); 181 182 if (ret != 0) { 183 ret = errno; 184 /* 185 * Translate EPROCLIM into well-known POSIX code EAGAIN. 186 */ 187 if (ret == EPROCLIM) 188 ret = EAGAIN; 189 } 190 191 if (create_suspended) 192 __sys_sigprocmask(SIG_SETMASK, &oset, NULL); 193 194 if (ret != 0) { 195 if (!locked) 196 THR_THREAD_LOCK(curthread, new_thread); 197 new_thread->state = PS_DEAD; 198 new_thread->tid = TID_TERMINATED; 199 new_thread->flags |= THR_FLAGS_DETACHED; 200 new_thread->refcount--; 201 if (new_thread->flags & THR_FLAGS_NEED_SUSPEND) { 202 new_thread->cycle++; 203 _thr_umtx_wake(&new_thread->cycle, INT_MAX, 0); 204 } 205 _thr_try_gc(curthread, new_thread); /* thread lock released */ 206 atomic_add_int(&_thread_active_threads, -1); 207 } else if (locked) { 208 if (cpusetp != NULL) { 209 if (cpuset_setaffinity(CPU_LEVEL_WHICH, CPU_WHICH_TID, 210 TID(new_thread), cpusetsize, cpusetp)) { 211 ret = errno; 212 /* kill the new thread */ 213 new_thread->force_exit = 1; 214 new_thread->flags |= THR_FLAGS_DETACHED; 215 _thr_try_gc(curthread, new_thread); 216 /* thread lock released */ 217 goto out; 218 } 219 } 220 221 _thr_report_creation(curthread, new_thread); 222 THR_THREAD_UNLOCK(curthread, new_thread); 223 } 224 out: 225 if (ret) 226 (*thread) = 0; 227 return (ret); 228 } 229 230 static int 231 create_stack(struct pthread_attr *pattr) 232 { 233 int ret; 234 235 /* Check if a stack was specified in the thread attributes: */ 236 if ((pattr->stackaddr_attr) != NULL) { 237 pattr->guardsize_attr = 0; 238 pattr->flags |= THR_STACK_USER; 239 ret = 0; 240 } 241 else 242 ret = _thr_stack_alloc(pattr); 243 return (ret); 244 } 245 246 static void 247 thread_start(struct pthread *curthread) 248 { 249 sigset_t set; 250 251 if (curthread->attr.suspend == THR_CREATE_SUSPENDED) 252 set = curthread->sigmask; 253 254 /* 255 * This is used as a serialization point to allow parent 256 * to report 'new thread' event to debugger or tweak new thread's 257 * attributes before the new thread does real-world work. 258 */ 259 THR_LOCK(curthread); 260 THR_UNLOCK(curthread); 261 262 if (curthread->force_exit) 263 _pthread_exit(PTHREAD_CANCELED); 264 265 if (curthread->attr.suspend == THR_CREATE_SUSPENDED) { 266 #if 0 267 /* Done in THR_UNLOCK() */ 268 _thr_ast(curthread); 269 #endif 270 271 /* 272 * Parent thread have stored signal mask for us, 273 * we should restore it now. 274 */ 275 __sys_sigprocmask(SIG_SETMASK, &set, NULL); 276 } 277 278 #ifdef _PTHREAD_FORCED_UNWIND 279 curthread->unwind_stackend = (char *)curthread->attr.stackaddr_attr + 280 curthread->attr.stacksize_attr; 281 #endif 282 283 /* Run the current thread's start routine with argument: */ 284 _pthread_exit(curthread->start_routine(curthread->arg)); 285 286 /* This point should never be reached. */ 287 PANIC("Thread has resumed after exit"); 288 } 289