1 /* 2 * Copyright (c) 2003 Daniel M. Eischen <deischen@freebsd.org> 3 * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au> 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, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by John Birrell. 17 * 4. Neither the name of the author nor the names of any co-contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $FreeBSD: src/lib/libpthread/thread/thr_init.c,v 1.66 2004/08/21 11:49:19 davidxu Exp $ 34 * $DragonFly: src/lib/libthread_xu/thread/thr_init.c,v 1.2 2005/02/21 13:47:21 davidxu Exp $ 35 */ 36 37 /* Allocate space for global thread variables here: */ 38 #define GLOBAL_PTHREAD_PRIVATE 39 40 #include "namespace.h" 41 #include <sys/param.h> 42 #include <sys/types.h> 43 #include <sys/signalvar.h> 44 #include <machine/reg.h> 45 46 #include <sys/ioctl.h> 47 #include <sys/mount.h> 48 #include <sys/uio.h> 49 #include <sys/socket.h> 50 #include <sys/event.h> 51 #include <sys/stat.h> 52 #include <sys/sysctl.h> 53 #include <sys/time.h> 54 #include <sys/ttycom.h> 55 #include <sys/wait.h> 56 #include <sys/mman.h> 57 #include <dirent.h> 58 #include <errno.h> 59 #include <fcntl.h> 60 #include <paths.h> 61 #include <pthread.h> 62 #include <pthread_np.h> 63 #include <signal.h> 64 #include <stdio.h> 65 #include <stdlib.h> 66 #include <string.h> 67 #include <unistd.h> 68 #include "un-namespace.h" 69 70 #include "libc_private.h" 71 #include "thr_private.h" 72 73 extern int _thread_state_running; 74 75 int __pthread_cond_wait(pthread_cond_t *, pthread_mutex_t *); 76 int __pthread_mutex_lock(pthread_mutex_t *); 77 int __pthread_mutex_trylock(pthread_mutex_t *); 78 79 void _thread_init(void) __attribute__ ((constructor)); 80 81 static void init_private(void); 82 static void init_main_thread(struct pthread *thread); 83 84 /* 85 * All weak references used within libc should be in this table. 86 * This is so that static libraries will work. 87 */ 88 static void *references[] = { 89 &_accept, 90 &_bind, 91 &_close, 92 &_connect, 93 &_dup, 94 &_dup2, 95 &_execve, 96 &_fcntl, 97 &_flock, 98 &_flockfile, 99 &_fstat, 100 &_fstatfs, 101 &_fsync, 102 &_funlockfile, 103 &_getdirentries, 104 &_getlogin, 105 &_getpeername, 106 &_getsockname, 107 &_getsockopt, 108 &_ioctl, 109 &_kevent, 110 &_listen, 111 &_nanosleep, 112 &_open, 113 &_pthread_getspecific, 114 &_pthread_key_create, 115 &_pthread_key_delete, 116 &_pthread_mutex_destroy, 117 &_pthread_mutex_init, 118 &_pthread_mutex_lock, 119 &_pthread_mutex_trylock, 120 &_pthread_mutex_unlock, 121 &_pthread_mutexattr_init, 122 &_pthread_mutexattr_destroy, 123 &_pthread_mutexattr_settype, 124 &_pthread_once, 125 &_pthread_setspecific, 126 &_read, 127 &_readv, 128 &_recvfrom, 129 &_recvmsg, 130 &_select, 131 &_sendmsg, 132 &_sendto, 133 &_setsockopt, 134 &_sigaction, 135 &_sigprocmask, 136 &_sigsuspend, 137 &_socket, 138 &_socketpair, 139 &_thread_init, 140 &_wait4, 141 &_write, 142 &_writev 143 }; 144 145 /* 146 * These are needed when linking statically. All references within 147 * libgcc (and in the future libc) to these routines are weak, but 148 * if they are not (strongly) referenced by the application or other 149 * libraries, then the actual functions will not be loaded. 150 */ 151 static void *libgcc_references[] = { 152 &_pthread_once, 153 &_pthread_key_create, 154 &_pthread_key_delete, 155 &_pthread_getspecific, 156 &_pthread_setspecific, 157 &_pthread_mutex_init, 158 &_pthread_mutex_destroy, 159 &_pthread_mutex_lock, 160 &_pthread_mutex_trylock, 161 &_pthread_mutex_unlock, 162 &_pthread_cond_init, 163 &_pthread_cond_destroy, 164 &_pthread_cond_wait, 165 &_pthread_cond_timedwait, 166 &_pthread_cond_signal, 167 &_pthread_cond_broadcast 168 }; 169 170 #if 0 171 #define DUAL_ENTRY(entry) \ 172 (pthread_func_t)entry, (pthread_func_t)entry 173 174 static pthread_func_t jmp_table[][2] = { 175 {DUAL_ENTRY(_pthread_cond_broadcast)}, /* PJT_COND_BROADCAST */ 176 {DUAL_ENTRY(_pthread_cond_destroy)}, /* PJT_COND_DESTROY */ 177 {DUAL_ENTRY(_pthread_cond_init)}, /* PJT_COND_INIT */ 178 {DUAL_ENTRY(_pthread_cond_signal)}, /* PJT_COND_SIGNAL */ 179 {(pthread_func_t)__pthread_cond_wait, 180 (pthread_func_t)_pthread_cond_wait}, /* PJT_COND_WAIT */ 181 {DUAL_ENTRY(_pthread_getspecific)}, /* PJT_GETSPECIFIC */ 182 {DUAL_ENTRY(_pthread_key_create)}, /* PJT_KEY_CREATE */ 183 {DUAL_ENTRY(_pthread_key_delete)}, /* PJT_KEY_DELETE*/ 184 {DUAL_ENTRY(_pthread_main_np)}, /* PJT_MAIN_NP */ 185 {DUAL_ENTRY(_pthread_mutex_destroy)}, /* PJT_MUTEX_DESTROY */ 186 {DUAL_ENTRY(_pthread_mutex_init)}, /* PJT_MUTEX_INIT */ 187 {(pthread_func_t)__pthread_mutex_lock, 188 (pthread_func_t)_pthread_mutex_lock}, /* PJT_MUTEX_LOCK */ 189 {(pthread_func_t)__pthread_mutex_trylock, 190 (pthread_func_t)_pthread_mutex_trylock},/* PJT_MUTEX_TRYLOCK */ 191 {DUAL_ENTRY(_pthread_mutex_unlock)}, /* PJT_MUTEX_UNLOCK */ 192 {DUAL_ENTRY(_pthread_mutexattr_destroy)}, /* PJT_MUTEXATTR_DESTROY */ 193 {DUAL_ENTRY(_pthread_mutexattr_init)}, /* PJT_MUTEXATTR_INIT */ 194 {DUAL_ENTRY(_pthread_mutexattr_settype)}, /* PJT_MUTEXATTR_SETTYPE */ 195 {DUAL_ENTRY(_pthread_once)}, /* PJT_ONCE */ 196 {DUAL_ENTRY(_pthread_rwlock_destroy)}, /* PJT_RWLOCK_DESTROY */ 197 {DUAL_ENTRY(_pthread_rwlock_init)}, /* PJT_RWLOCK_INIT */ 198 {DUAL_ENTRY(_pthread_rwlock_rdlock)}, /* PJT_RWLOCK_RDLOCK */ 199 {DUAL_ENTRY(_pthread_rwlock_tryrdlock)},/* PJT_RWLOCK_TRYRDLOCK */ 200 {DUAL_ENTRY(_pthread_rwlock_trywrlock)},/* PJT_RWLOCK_TRYWRLOCK */ 201 {DUAL_ENTRY(_pthread_rwlock_unlock)}, /* PJT_RWLOCK_UNLOCK */ 202 {DUAL_ENTRY(_pthread_rwlock_wrlock)}, /* PJT_RWLOCK_WRLOCK */ 203 {DUAL_ENTRY(_pthread_self)}, /* PJT_SELF */ 204 {DUAL_ENTRY(_pthread_setspecific)}, /* PJT_SETSPECIFIC */ 205 {DUAL_ENTRY(_pthread_sigmask)} /* PJT_SIGMASK */ 206 }; 207 #endif 208 209 static int init_once = 0; 210 211 /* 212 * Threaded process initialization. 213 * 214 * This is only called under two conditions: 215 * 216 * 1) Some thread routines have detected that the library hasn't yet 217 * been initialized (_thr_initial == NULL && curthread == NULL), or 218 * 219 * 2) An explicit call to reinitialize after a fork (indicated 220 * by curthread != NULL) 221 */ 222 void 223 _libpthread_init(struct pthread *curthread) 224 { 225 int fd, first = 0; 226 sigset_t sigset, oldset; 227 228 /* Check if this function has already been called: */ 229 if ((_thr_initial != NULL) && (curthread == NULL)) 230 /* Only initialize the threaded application once. */ 231 return; 232 233 /* 234 * Make gcc quiescent about {,libgcc_}references not being 235 * referenced: 236 */ 237 if ((references[0] == NULL) || (libgcc_references[0] == NULL)) 238 PANIC("Failed loading mandatory references in _thread_init"); 239 240 /* Pull debug symbols in for static binary */ 241 _thread_state_running = PS_RUNNING; 242 243 #if 0 244 /* 245 * Check the size of the jump table to make sure it is preset 246 * with the correct number of entries. 247 */ 248 if (sizeof(jmp_table) != (sizeof(pthread_func_t) * PJT_MAX * 2)) 249 PANIC("Thread jump table not properly initialized"); 250 memcpy(__thr_jtable, jmp_table, sizeof(jmp_table)); 251 #endif 252 /* 253 * Check for the special case of this process running as 254 * or in place of init as pid = 1: 255 */ 256 if ((_thr_pid = getpid()) == 1) { 257 /* 258 * Setup a new session for this process which is 259 * assumed to be running as root. 260 */ 261 if (setsid() == -1) 262 PANIC("Can't set session ID"); 263 if (revoke(_PATH_CONSOLE) != 0) 264 PANIC("Can't revoke console"); 265 if ((fd = __sys_open(_PATH_CONSOLE, O_RDWR)) < 0) 266 PANIC("Can't open console"); 267 if (setlogin("root") == -1) 268 PANIC("Can't set login to root"); 269 if (__sys_ioctl(fd, TIOCSCTTY, (char *) NULL) == -1) 270 PANIC("Can't set controlling terminal"); 271 } 272 273 /* Initialize pthread private data. */ 274 init_private(); 275 276 /* Set the initial thread. */ 277 if (curthread == NULL) { 278 first = 1; 279 /* Create and initialize the initial thread. */ 280 curthread = _thr_alloc(NULL); 281 if (curthread == NULL) 282 PANIC("Can't allocate initial thread"); 283 init_main_thread(curthread); 284 } 285 /* 286 * Add the thread to the thread list queue. 287 */ 288 THR_LIST_ADD(curthread); 289 _thread_active_threads = 1; 290 291 /* Setup the thread specific data */ 292 _tcb_set(curthread->tcb); 293 294 if (first) { 295 SIGFILLSET(sigset); 296 __sys_sigprocmask(SIG_SETMASK, &sigset, &oldset); 297 _thr_signal_init(); 298 _thr_initial = curthread; 299 SIGDELSET(oldset, SIGCANCEL); 300 __sys_sigprocmask(SIG_SETMASK, &oldset, NULL); 301 } 302 } 303 304 /* 305 * This function and pthread_create() do a lot of the same things. 306 * It'd be nice to consolidate the common stuff in one place. 307 */ 308 static void 309 init_main_thread(struct pthread *thread) 310 { 311 /* Setup the thread attributes. */ 312 thread->tid = _thr_get_tid(); 313 thread->attr = _pthread_attr_default; 314 /* 315 * Set up the thread stack. 316 * 317 * Create a red zone below the main stack. All other stacks 318 * are constrained to a maximum size by the parameters 319 * passed to mmap(), but this stack is only limited by 320 * resource limits, so this stack needs an explicitly mapped 321 * red zone to protect the thread stack that is just beyond. 322 */ 323 if (mmap((void *)_usrstack - _thr_stack_initial - 324 _thr_guard_default, _thr_guard_default, 0, MAP_ANON, 325 -1, 0) == MAP_FAILED) 326 PANIC("Cannot allocate red zone for initial thread"); 327 328 /* 329 * Mark the stack as an application supplied stack so that it 330 * isn't deallocated. 331 * 332 * XXX - I'm not sure it would hurt anything to deallocate 333 * the main thread stack because deallocation doesn't 334 * actually free() it; it just puts it in the free 335 * stack queue for later reuse. 336 */ 337 thread->attr.stackaddr_attr = (void *)_usrstack - _thr_stack_initial; 338 thread->attr.stacksize_attr = _thr_stack_initial; 339 thread->attr.guardsize_attr = _thr_guard_default; 340 thread->attr.flags |= THR_STACK_USER; 341 342 /* 343 * Write a magic value to the thread structure 344 * to help identify valid ones: 345 */ 346 thread->magic = THR_MAGIC; 347 348 thread->cancelflags = PTHREAD_CANCEL_ENABLE | PTHREAD_CANCEL_DEFERRED; 349 thread->name = strdup("initial thread"); 350 351 /* Default the priority of the initial thread: */ 352 thread->base_priority = THR_DEFAULT_PRIORITY; 353 thread->active_priority = THR_DEFAULT_PRIORITY; 354 thread->inherited_priority = 0; 355 356 /* Initialize the mutex queue: */ 357 TAILQ_INIT(&thread->mutexq); 358 TAILQ_INIT(&thread->pri_mutexq); 359 360 thread->state = PS_RUNNING; 361 thread->uniqueid = 0; 362 363 /* Others cleared to zero by thr_alloc() */ 364 } 365 366 static void 367 init_private(void) 368 { 369 size_t len; 370 int mib[2]; 371 372 _thr_umtx_init(&_mutex_static_lock); 373 _thr_umtx_init(&_cond_static_lock); 374 _thr_umtx_init(&_rwlock_static_lock); 375 _thr_umtx_init(&_keytable_lock); 376 _thr_umtx_init(&_thr_atfork_lock); 377 _thr_spinlock_init(); 378 _thr_list_init(); 379 380 /* 381 * Avoid reinitializing some things if they don't need to be, 382 * e.g. after a fork(). 383 */ 384 if (init_once == 0) { 385 /* Find the stack top */ 386 mib[0] = CTL_KERN; 387 mib[1] = KERN_USRSTACK; 388 len = sizeof (_usrstack); 389 if (sysctl(mib, 2, &_usrstack, &len, NULL, 0) == -1) 390 PANIC("Cannot get kern.usrstack from sysctl"); 391 _thr_page_size = getpagesize(); 392 _thr_guard_default = _thr_page_size; 393 _pthread_attr_default.guardsize_attr = _thr_guard_default; 394 395 TAILQ_INIT(&_thr_atfork_list); 396 #ifdef SYSTEM_SCOPE_ONLY 397 _thread_scope_system = 1; 398 #else 399 if (getenv("LIBPTHREAD_SYSTEM_SCOPE") != NULL) 400 _thread_scope_system = 1; 401 else if (getenv("LIBPTHREAD_PROCESS_SCOPE") != NULL) 402 _thread_scope_system = -1; 403 #endif 404 } 405 init_once = 1; 406 } 407 408 void 409 _thread_init(void) 410 { 411 _libpthread_init(NULL); 412 } 413 414 extern int _thread_autoinit_dummy_decl; 415 int _thread_autoinit_dummy_decl = 0; 416