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_affinity.c */ 109 STATIC_LIB_REQUIRE(_pthread_getaffinity_np); 110 /* thr_getprio.c */ 111 STATIC_LIB_REQUIRE(_pthread_getprio); 112 /* thr_getschedparam.c */ 113 STATIC_LIB_REQUIRE(_pthread_getschedparam); 114 /* thr_info.c */ 115 STATIC_LIB_REQUIRE(_pthread_set_name_np); 116 /* thr_init.c */ 117 STATIC_LIB_REQUIRE(_pthread_init_early); 118 /* thr_join.c */ 119 STATIC_LIB_REQUIRE(_pthread_join); 120 /* thr_kill.c */ 121 STATIC_LIB_REQUIRE(_pthread_kill); 122 /* thr_main_np.c */ 123 STATIC_LIB_REQUIRE(_pthread_main_np); 124 /* thr_multi_np.c */ 125 STATIC_LIB_REQUIRE(_pthread_multi_np); 126 /* thr_mutex.c */ 127 STATIC_LIB_REQUIRE(_pthread_mutex_init); 128 /* thr_mutex_prioceiling.c */ 129 STATIC_LIB_REQUIRE(_pthread_mutexattr_getprioceiling); 130 /* thr_mutex_protocol.c */ 131 STATIC_LIB_REQUIRE(_pthread_mutexattr_getprotocol); 132 /* thr_mutexattr.c */ 133 STATIC_LIB_REQUIRE(_pthread_mutexattr_init); 134 /* thr_once.c */ 135 STATIC_LIB_REQUIRE(_pthread_once); 136 /* thr_pspinlock.c */ 137 STATIC_LIB_REQUIRE(_pthread_spin_init); 138 /* thr_resume_np.c */ 139 STATIC_LIB_REQUIRE(_pthread_resume_np); 140 /* thr_rwlock.c */ 141 STATIC_LIB_REQUIRE(_pthread_rwlock_init); 142 /* thr_rwlockattr.c */ 143 STATIC_LIB_REQUIRE(_pthread_rwlockattr_init); 144 /* thr_self.c */ 145 STATIC_LIB_REQUIRE(_pthread_self); 146 /* thr_sem.c */ 147 STATIC_LIB_REQUIRE(_sem_init); 148 /* thr_affinity.c */ 149 STATIC_LIB_REQUIRE(_pthread_setaffinity_np); 150 /* thr_setprio.c */ 151 STATIC_LIB_REQUIRE(_pthread_setprio); 152 /* thr_setschedparam.c */ 153 STATIC_LIB_REQUIRE(_pthread_setschedparam); 154 /* thr_sig.c */ 155 STATIC_LIB_REQUIRE(_sigwait); 156 /* thr_single_np.c */ 157 STATIC_LIB_REQUIRE(_pthread_single_np); 158 /* thr_spec.c */ 159 STATIC_LIB_REQUIRE(_pthread_key_create); 160 /* thr_spinlock.c */ 161 STATIC_LIB_REQUIRE(_spinlock); 162 /* thr_suspend_np.c */ 163 STATIC_LIB_REQUIRE(_pthread_suspend_np); 164 /* thr_switch_np.c */ 165 STATIC_LIB_REQUIRE(_pthread_switch_add_np); 166 /* thr_symbols.c */ 167 STATIC_LIB_REQUIRE(_thread_state_running); 168 /* thr_syscalls.c */ 169 STATIC_LIB_REQUIRE(__wait4); 170 /* thr_yield.c */ 171 STATIC_LIB_REQUIRE(_pthread_yield); 172 173 char *_usrstack; 174 struct pthread *_thr_initial; 175 static void *_thr_main_redzone; 176 177 pid_t _thr_pid; 178 size_t _thr_guard_default; 179 size_t _thr_stack_default = THR_STACK_DEFAULT; 180 size_t _thr_stack_initial = THR_STACK_INITIAL; 181 int _thr_page_size; 182 183 static void init_private(void); 184 static void _libpthread_uninit(void); 185 static void init_main_thread(struct pthread *thread); 186 static int init_once = 0; 187 188 void _thread_init(void) __attribute__ ((constructor)); 189 void 190 _thread_init(void) 191 { 192 _libpthread_init(NULL); 193 } 194 195 void _thread_uninit(void) __attribute__ ((destructor)); 196 void 197 _thread_uninit(void) 198 { 199 _libpthread_uninit(); 200 } 201 202 /* 203 * This function is used by libc to initialise libpthread 204 * early during dynamic linking. 205 */ 206 void _pthread_init_early(void); 207 void 208 _pthread_init_early(void) 209 { 210 _libpthread_init(NULL); 211 } 212 213 /* 214 * Threaded process initialization. 215 * 216 * This is only called under two conditions: 217 * 218 * 1) Some thread routines have detected that the library hasn't yet 219 * been initialized (_thr_initial == NULL && curthread == NULL), or 220 * 221 * 2) An explicit call to reinitialize after a fork (indicated 222 * by curthread != NULL) 223 */ 224 void 225 _libpthread_init(struct pthread *curthread) 226 { 227 int fd, first = 0; 228 sigset_t sigset, oldset; 229 230 /* Check if this function has already been called: */ 231 if ((_thr_initial != NULL) && (curthread == NULL)) 232 /* Only initialize the threaded application once. */ 233 return; 234 235 /* 236 * Check for the special case of this process running as 237 * or in place of init as pid = 1: 238 */ 239 if ((_thr_pid = getpid()) == 1) { 240 /* 241 * Setup a new session for this process which is 242 * assumed to be running as root. 243 */ 244 if (setsid() == -1) 245 PANIC("Can't set session ID"); 246 if (revoke(_PATH_CONSOLE) != 0) 247 PANIC("Can't revoke console"); 248 if ((fd = __sys_open(_PATH_CONSOLE, O_RDWR)) < 0) 249 PANIC("Can't open console"); 250 if (setlogin("root") == -1) 251 PANIC("Can't set login to root"); 252 if (__sys_ioctl(fd, TIOCSCTTY, NULL) == -1) 253 PANIC("Can't set controlling terminal"); 254 } 255 256 /* Initialize pthread private data. */ 257 init_private(); 258 259 /* Set the initial thread. */ 260 if (curthread == NULL) { 261 first = 1; 262 /* Create and initialize the initial thread. */ 263 curthread = _thr_alloc(NULL); 264 if (curthread == NULL) 265 PANIC("Can't allocate initial thread"); 266 init_main_thread(curthread); 267 } 268 /* 269 * Add the thread to the thread list queue. 270 */ 271 THR_LIST_ADD(curthread); 272 _thread_active_threads = 1; 273 274 /* Setup the thread specific data */ 275 tls_set_tcb(curthread->tcb); 276 277 if (first) { 278 SIGFILLSET(sigset); 279 __sys_sigprocmask(SIG_SETMASK, &sigset, &oldset); 280 _thr_signal_init(); 281 _thr_initial = curthread; 282 SIGDELSET(oldset, SIGCANCEL); 283 __sys_sigprocmask(SIG_SETMASK, &oldset, NULL); 284 if (td_eventismember(&_thread_event_mask, TD_CREATE)) 285 _thr_report_creation(curthread, curthread); 286 } 287 } 288 289 static void 290 _libpthread_uninit(void) 291 { 292 if (_thr_initial == NULL) 293 return; 294 if (_thr_main_redzone && _thr_main_redzone != MAP_FAILED) { 295 munmap(_thr_main_redzone, _thr_guard_default); 296 _thr_main_redzone = NULL; 297 } 298 _thr_stack_cleanup(); 299 } 300 301 /* 302 * This function and pthread_create() do a lot of the same things. 303 * It'd be nice to consolidate the common stuff in one place. 304 */ 305 static void 306 init_main_thread(struct pthread *thread) 307 { 308 /* Setup the thread attributes. */ 309 thread->tid = _thr_get_tid(); 310 thread->attr = _pthread_attr_default; 311 /* 312 * Set up the thread stack. 313 * 314 * Create a red zone below the main stack. All other stacks 315 * are constrained to a maximum size by the parameters 316 * passed to mmap(), but this stack is only limited by 317 * resource limits, so this stack needs an explicitly mapped 318 * red zone to protect the thread stack that is just beyond. 319 */ 320 _thr_main_redzone = mmap(_usrstack - _thr_stack_initial - 321 _thr_guard_default, _thr_guard_default, 322 0, MAP_ANON | MAP_TRYFIXED, -1, 0); 323 if (_thr_main_redzone == MAP_FAILED) { 324 PANIC("Cannot allocate red zone for initial thread"); 325 } 326 327 /* 328 * Mark the stack as an application supplied stack so that it 329 * isn't deallocated. 330 * 331 * XXX - I'm not sure it would hurt anything to deallocate 332 * the main thread stack because deallocation doesn't 333 * actually free() it; it just puts it in the free 334 * stack queue for later reuse. 335 */ 336 thread->attr.stackaddr_attr = _usrstack - _thr_stack_initial; 337 thread->attr.stacksize_attr = _thr_stack_initial; 338 thread->attr.guardsize_attr = _thr_guard_default; 339 thread->attr.flags |= THR_STACK_USER; 340 341 /* 342 * Write a magic value to the thread structure 343 * to help identify valid ones: 344 */ 345 thread->magic = THR_MAGIC; 346 347 thread->cancelflags = PTHREAD_CANCEL_ENABLE | PTHREAD_CANCEL_DEFERRED; 348 thread->name = strdup("initial thread"); 349 350 /* Default the priority of the initial thread: */ 351 thread->base_priority = THR_DEFAULT_PRIORITY; 352 thread->active_priority = THR_DEFAULT_PRIORITY; 353 thread->inherited_priority = 0; 354 355 /* Initialize the mutex queue: */ 356 TAILQ_INIT(&thread->mutexq); 357 358 thread->state = PS_RUNNING; 359 thread->uniqueid = 0; 360 361 /* Others cleared to zero by thr_alloc() */ 362 } 363 364 static void 365 init_private(void) 366 { 367 size_t len; 368 int mib[2]; 369 370 _thr_umtx_init(&_mutex_static_lock); 371 _thr_umtx_init(&_cond_static_lock); 372 _thr_umtx_init(&_rwlock_static_lock); 373 _thr_umtx_init(&_keytable_lock); 374 _thr_umtx_init(&_thr_atfork_lock); 375 _thr_umtx_init(&_thr_event_lock); 376 _thr_spinlock_init(); 377 _thr_list_init(); 378 379 /* 380 * Avoid reinitializing some things if they don't need to be, 381 * e.g. after a fork(). 382 */ 383 if (init_once == 0) { 384 /* Find the stack top */ 385 mib[0] = CTL_KERN; 386 mib[1] = KERN_USRSTACK; 387 len = sizeof (_usrstack); 388 if (sysctl(mib, 2, &_usrstack, &len, NULL, 0) == -1) 389 PANIC("Cannot get kern.usrstack from sysctl"); 390 _thr_page_size = getpagesize(); 391 _thr_guard_default = _thr_page_size; 392 _pthread_attr_default.guardsize_attr = _thr_guard_default; 393 TAILQ_INIT(&_thr_atfork_list); 394 } 395 init_once = 1; 396 } 397 398 __strong_reference(_pthread_init_early, pthread_init_early); 399