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