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