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