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 34 #include "namespace.h" 35 #include <sys/param.h> 36 #include <sys/signalvar.h> 37 #include <sys/ioctl.h> 38 #include <sys/sysctl.h> 39 #include <sys/time.h> 40 #include <sys/ttycom.h> 41 #include <sys/mman.h> 42 #include <stdio.h> 43 #include <fcntl.h> 44 #include <paths.h> 45 #include <pthread.h> 46 #include <signal.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <unistd.h> 50 #include "un-namespace.h" 51 52 #include "libc_private.h" 53 #include "thr_private.h" 54 55 /* Default thread attributes: */ 56 struct pthread_attr _pthread_attr_default = { 57 .sched_policy = SCHED_OTHER, 58 .sched_inherit = 0, 59 .prio = THR_DEFAULT_PRIORITY, 60 .suspend = THR_CREATE_RUNNING, 61 .flags = PTHREAD_SCOPE_SYSTEM, 62 .stackaddr_attr = NULL, 63 .stacksize_attr = THR_STACK_DEFAULT, 64 .guardsize_attr = 0 65 }; 66 67 /* Default mutex attributes: */ 68 struct pthread_mutex_attr _pthread_mutexattr_default = { 69 .m_type = PTHREAD_MUTEX_DEFAULT, 70 .m_protocol = PTHREAD_PRIO_NONE, 71 .m_ceiling = 0, 72 .m_flags = 0 73 }; 74 75 /* Default condition variable attributes: */ 76 struct pthread_cond_attr _pthread_condattr_default = { 77 .c_pshared = PTHREAD_PROCESS_PRIVATE, 78 .c_clockid = CLOCK_REALTIME 79 }; 80 81 /* thr_attr.c */ 82 STATIC_LIB_REQUIRE(_pthread_attr_init); 83 /* thr_barrier.c */ 84 STATIC_LIB_REQUIRE(_pthread_barrier_init); 85 /* thr_barrierattr.c */ 86 STATIC_LIB_REQUIRE(_pthread_barrierattr_init); 87 /* thr_cancel.c */ 88 STATIC_LIB_REQUIRE(_pthread_cancel); 89 /* thr_clean.c */ 90 STATIC_LIB_REQUIRE(_pthread_cleanup_push); 91 /* thr_concurrency.c */ 92 STATIC_LIB_REQUIRE(_pthread_getconcurrency); 93 STATIC_LIB_REQUIRE(_pthread_setconcurrency); 94 /* thr_cond.c */ 95 STATIC_LIB_REQUIRE(_pthread_cond_init); 96 /* thr_condattr.c */ 97 STATIC_LIB_REQUIRE(_pthread_condattr_init); 98 /* thr_create.c */ 99 STATIC_LIB_REQUIRE(_pthread_create); 100 /* thr_detach.c */ 101 STATIC_LIB_REQUIRE(_pthread_detach); 102 /* thr_equal.c */ 103 STATIC_LIB_REQUIRE(_pthread_equal); 104 /* thr_exit.c */ 105 STATIC_LIB_REQUIRE(_pthread_exit); 106 /* thr_fork.c */ 107 STATIC_LIB_REQUIRE(_pthread_atfork); 108 STATIC_LIB_REQUIRE(_fork); 109 /* thr_affinity.c */ 110 STATIC_LIB_REQUIRE(_pthread_getaffinity_np); 111 /* thr_getcpuclockid.c */ 112 STATIC_LIB_REQUIRE(_pthread_getcpuclockid); 113 /* thr_getprio.c */ 114 STATIC_LIB_REQUIRE(_pthread_getprio); 115 /* thr_getschedparam.c */ 116 STATIC_LIB_REQUIRE(_pthread_getschedparam); 117 /* thr_getthreadid_np.c */ 118 STATIC_LIB_REQUIRE(_pthread_getthreadid_np); 119 /* thr_info.c */ 120 STATIC_LIB_REQUIRE(_pthread_set_name_np); 121 /* thr_init.c */ 122 STATIC_LIB_REQUIRE(_pthread_init_early); 123 /* thr_join.c */ 124 STATIC_LIB_REQUIRE(_pthread_join); 125 /* thr_kill.c */ 126 STATIC_LIB_REQUIRE(_pthread_kill); 127 /* thr_main_np.c */ 128 STATIC_LIB_REQUIRE(_pthread_main_np); 129 /* thr_multi_np.c */ 130 STATIC_LIB_REQUIRE(_pthread_multi_np); 131 /* thr_mutex.c */ 132 STATIC_LIB_REQUIRE(_pthread_mutex_init); 133 /* thr_mutex_prioceiling.c */ 134 STATIC_LIB_REQUIRE(_pthread_mutexattr_getprioceiling); 135 /* thr_mutex_protocol.c */ 136 STATIC_LIB_REQUIRE(_pthread_mutexattr_getprotocol); 137 /* thr_mutexattr.c */ 138 STATIC_LIB_REQUIRE(_pthread_mutexattr_init); 139 /* thr_once.c */ 140 STATIC_LIB_REQUIRE(_pthread_once); 141 /* thr_pspinlock.c */ 142 STATIC_LIB_REQUIRE(_pthread_spin_init); 143 /* thr_resume_np.c */ 144 STATIC_LIB_REQUIRE(_pthread_resume_np); 145 /* thr_rwlock.c */ 146 STATIC_LIB_REQUIRE(_pthread_rwlock_init); 147 /* thr_rwlockattr.c */ 148 STATIC_LIB_REQUIRE(_pthread_rwlockattr_init); 149 /* thr_self.c */ 150 STATIC_LIB_REQUIRE(_pthread_self); 151 /* thr_sem.c */ 152 STATIC_LIB_REQUIRE(_sem_init); 153 /* thr_affinity.c */ 154 STATIC_LIB_REQUIRE(_pthread_setaffinity_np); 155 /* thr_setprio.c */ 156 STATIC_LIB_REQUIRE(_pthread_setprio); 157 /* thr_setschedparam.c */ 158 STATIC_LIB_REQUIRE(_pthread_setschedparam); 159 /* thr_sig.c */ 160 STATIC_LIB_REQUIRE(_sigwait); 161 /* thr_single_np.c */ 162 STATIC_LIB_REQUIRE(_pthread_single_np); 163 /* thr_spec.c */ 164 STATIC_LIB_REQUIRE(_pthread_key_create); 165 /* thr_spinlock.c */ 166 STATIC_LIB_REQUIRE(_spinlock); 167 /* thr_suspend_np.c */ 168 STATIC_LIB_REQUIRE(_pthread_suspend_np); 169 /* thr_switch_np.c */ 170 STATIC_LIB_REQUIRE(_pthread_switch_add_np); 171 /* thr_symbols.c */ 172 STATIC_LIB_REQUIRE(_thread_state_running); 173 /* thr_syscalls.c */ 174 STATIC_LIB_REQUIRE(__wait4); 175 /* thr_yield.c */ 176 STATIC_LIB_REQUIRE(_pthread_yield); 177 178 char *_usrstack; 179 struct pthread *_thr_initial; 180 static void *_thr_main_redzone; 181 182 pid_t _thr_pid; 183 size_t _thr_guard_default; 184 size_t _thr_stack_default = THR_STACK_DEFAULT; 185 size_t _thr_stack_initial = THR_STACK_INITIAL; 186 int _thr_page_size; 187 188 static void init_private(void); 189 static void _libpthread_uninit(void); 190 static void init_main_thread(struct pthread *thread); 191 192 void _thread_init(void) __attribute__ ((constructor)); 193 void 194 _thread_init(void) 195 { 196 _libpthread_init(NULL); 197 } 198 199 void _thread_uninit(void) __attribute__ ((destructor)); 200 void 201 _thread_uninit(void) 202 { 203 _libpthread_uninit(); 204 } 205 206 /* 207 * This function is used by libc to initialise libpthread 208 * early during dynamic linking. 209 */ 210 void _pthread_init_early(void); 211 void 212 _pthread_init_early(void) 213 { 214 _libpthread_init(NULL); 215 } 216 217 /* 218 * Threaded process initialization. 219 * 220 * This is only called under two conditions: 221 * 222 * 1) Some thread routines have detected that the library hasn't yet 223 * been initialized (_thr_initial == NULL && curthread == NULL), or 224 * 225 * 2) An explicit call to reinitialize after a fork (indicated 226 * by curthread != NULL) 227 */ 228 void 229 _libpthread_init(struct pthread *curthread) 230 { 231 int fd, first = 0; 232 sigset_t sigset, oldset; 233 234 /* Check if this function has already been called: */ 235 if ((_thr_initial != NULL) && (curthread == NULL)) 236 /* Only initialize the threaded application once. */ 237 return; 238 239 /* 240 * Check for the special case of this process running as 241 * or in place of init as pid = 1: 242 */ 243 if ((_thr_pid = getpid()) == 1) { 244 /* 245 * Setup a new session for this process which is 246 * assumed to be running as root. 247 */ 248 if (setsid() == -1) 249 PANIC("Can't set session ID"); 250 if (revoke(_PATH_CONSOLE) != 0) 251 PANIC("Can't revoke console"); 252 if ((fd = __sys_open(_PATH_CONSOLE, O_RDWR)) < 0) 253 PANIC("Can't open console"); 254 if (setlogin("root") == -1) 255 PANIC("Can't set login to root"); 256 if (__sys_ioctl(fd, TIOCSCTTY, NULL) == -1) 257 PANIC("Can't set controlling terminal"); 258 } 259 260 /* Initialize pthread private data. */ 261 init_private(); 262 263 /* Set the initial thread. */ 264 if (curthread == NULL) { 265 first = 1; 266 /* Create and initialize the initial thread. */ 267 curthread = _thr_alloc(NULL); 268 if (curthread == NULL) 269 PANIC("Can't allocate initial thread"); 270 init_main_thread(curthread); 271 } 272 /* 273 * Add the thread to the thread list queue. 274 */ 275 THR_LIST_ADD(curthread); 276 _thread_active_threads = 1; 277 278 /* Setup the thread specific data */ 279 tls_set_tcb(curthread->tcb); 280 281 if (first) { 282 SIGFILLSET(sigset); 283 __sys_sigprocmask(SIG_SETMASK, &sigset, &oldset); 284 _thr_signal_init(); 285 _thr_initial = curthread; 286 SIGDELSET(oldset, SIGCANCEL); 287 __sys_sigprocmask(SIG_SETMASK, &oldset, NULL); 288 if (td_eventismember(&_thread_event_mask, TD_CREATE)) 289 _thr_report_creation(curthread, curthread); 290 _thr_rtld_init(); 291 _thr_malloc_init(); 292 _thr_sem_init(); 293 } 294 } 295 296 static void 297 _libpthread_uninit(void) 298 { 299 if (_thr_initial == NULL) 300 return; 301 if (_thr_main_redzone && _thr_main_redzone != MAP_FAILED) { 302 munmap(_thr_main_redzone, _thr_guard_default); 303 _thr_main_redzone = NULL; 304 } 305 _thr_stack_cleanup(); 306 } 307 308 /* 309 * This function and pthread_create() do a lot of the same things. 310 * It'd be nice to consolidate the common stuff in one place. 311 */ 312 static void 313 init_main_thread(struct pthread *thread) 314 { 315 /* Setup the thread attributes. */ 316 thread->tid = _thr_get_tid(); 317 thread->attr = _pthread_attr_default; 318 /* 319 * Set up the thread stack. 320 * 321 * Create a red zone below the main stack. All other stacks 322 * are constrained to a maximum size by the parameters 323 * passed to mmap(), but this stack is only limited by 324 * resource limits, so this stack needs an explicitly mapped 325 * red zone to protect the thread stack that is just beyond. 326 */ 327 _thr_main_redzone = mmap(_usrstack - _thr_stack_initial - 328 _thr_guard_default, _thr_guard_default, 329 0, MAP_ANON | MAP_TRYFIXED, -1, 0); 330 if (_thr_main_redzone == MAP_FAILED) { 331 PANIC("Cannot allocate red zone for initial thread"); 332 } 333 334 /* 335 * Mark the stack as an application supplied stack so that it 336 * isn't deallocated. 337 * 338 * XXX - I'm not sure it would hurt anything to deallocate 339 * the main thread stack because deallocation doesn't 340 * actually free() it; it just puts it in the free 341 * stack queue for later reuse. 342 */ 343 thread->attr.stackaddr_attr = _usrstack - _thr_stack_initial; 344 thread->attr.stacksize_attr = _thr_stack_initial; 345 thread->attr.guardsize_attr = _thr_guard_default; 346 thread->attr.flags |= THR_STACK_USER; 347 348 /* 349 * Write a magic value to the thread structure 350 * to help identify valid ones: 351 */ 352 thread->magic = THR_MAGIC; 353 354 thread->cancelflags = PTHREAD_CANCEL_ENABLE | PTHREAD_CANCEL_DEFERRED; 355 thread->name = __malloc(16); 356 snprintf(thread->name, 16, "initial thread"); 357 358 /* Default the priority of the initial thread: */ 359 thread->base_priority = THR_DEFAULT_PRIORITY; 360 thread->active_priority = THR_DEFAULT_PRIORITY; 361 thread->inherited_priority = 0; 362 363 /* Initialize the mutex queue: */ 364 TAILQ_INIT(&thread->mutexq); 365 366 thread->state = PS_RUNNING; 367 thread->uniqueid = 0; 368 369 /* Others cleared to zero by thr_alloc() */ 370 } 371 372 static void 373 init_private(void) 374 { 375 static int init_once = 0; 376 size_t len; 377 int mib[2]; 378 379 /* 380 * Avoid reinitializing some things if they don't need to be, 381 * e.g. after a fork(). 382 * 383 * NOTE: _thr_atfork_*list must remain intact after a fork. 384 */ 385 if (init_once == 0) { 386 /* Find the stack top */ 387 mib[0] = CTL_KERN; 388 mib[1] = KERN_USRSTACK; 389 len = sizeof (_usrstack); 390 if (sysctl(mib, 2, &_usrstack, &len, NULL, 0) == -1) 391 PANIC("Cannot get kern.usrstack from sysctl"); 392 _thr_page_size = getpagesize(); 393 _thr_guard_default = _thr_page_size; 394 _pthread_attr_default.guardsize_attr = _thr_guard_default; 395 TAILQ_INIT(&_thr_atfork_list); 396 TAILQ_INIT(&_thr_atfork_kern_list); 397 init_once = 1; 398 } 399 400 _thr_umtx_init(&_mutex_static_lock); 401 _thr_umtx_init(&_cond_static_lock); 402 _thr_umtx_init(&_rwlock_static_lock); 403 _thr_umtx_init(&_keytable_lock); 404 _thr_umtx_init(&_thr_atfork_lock); 405 _thr_umtx_init(&_thr_event_lock); 406 _thr_spinlock_init(); 407 _thr_list_init(); 408 } 409 410 __strong_reference(_pthread_init_early, pthread_init_early); 411