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 * $DragonFly: src/lib/libthread_xu/thread/thr_init.c,v 1.8 2006/04/06 13:03:09 davidxu Exp $ 34 */ 35 36 #include "namespace.h" 37 #include <sys/param.h> 38 #include <sys/signalvar.h> 39 40 #include <sys/ioctl.h> 41 #include <sys/sysctl.h> 42 #include <sys/time.h> 43 #include <sys/ttycom.h> 44 #include <sys/mman.h> 45 46 #include <fcntl.h> 47 #include <paths.h> 48 #include <pthread.h> 49 #include <signal.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #include <unistd.h> 53 #include "un-namespace.h" 54 55 #include "libc_private.h" 56 #include "thr_private.h" 57 58 /* thr_attr.c */ 59 STATIC_LIB_REQUIRE(_pthread_attr_init); 60 /* thr_barrier.c */ 61 STATIC_LIB_REQUIRE(_pthread_barrier_init); 62 /* thr_barrierattr.c */ 63 STATIC_LIB_REQUIRE(_pthread_barrierattr_init); 64 /* thr_cancel.c */ 65 STATIC_LIB_REQUIRE(_pthread_cancel); 66 /* thr_clean.c */ 67 STATIC_LIB_REQUIRE(_pthread_cleanup_push); 68 /* thr_concurrency.c */ 69 STATIC_LIB_REQUIRE(_pthread_get_concurrency); 70 /* thr_cond.c */ 71 STATIC_LIB_REQUIRE(_pthread_cond_init); 72 /* thr_condattr.c */ 73 STATIC_LIB_REQUIRE(_pthread_condattr_init); 74 /* thr_create.c */ 75 STATIC_LIB_REQUIRE(_pthread_create); 76 /* thr_detach.c */ 77 STATIC_LIB_REQUIRE(_pthread_detach); 78 /* thr_equal.c */ 79 STATIC_LIB_REQUIRE(_pthread_equal); 80 /* thr_exit.c */ 81 STATIC_LIB_REQUIRE(_pthread_exit); 82 /* thr_fork.c */ 83 STATIC_LIB_REQUIRE(_pthread_atfork); 84 STATIC_LIB_REQUIRE(_fork); 85 /* thr_getprio.c */ 86 STATIC_LIB_REQUIRE(_pthread_getprio); 87 /* thr_getschedparam.c */ 88 STATIC_LIB_REQUIRE(_pthread_getschedparam); 89 /* thr_info.c */ 90 STATIC_LIB_REQUIRE(_pthread_set_name_np); 91 /* thr_join.c */ 92 STATIC_LIB_REQUIRE(_pthread_join); 93 /* thr_kill.c */ 94 STATIC_LIB_REQUIRE(_pthread_kill); 95 /* thr_main_np.c */ 96 STATIC_LIB_REQUIRE(_pthread_main_np); 97 /* thr_multi_np.c */ 98 STATIC_LIB_REQUIRE(_pthread_multi_np); 99 /* thr_mutex.c */ 100 STATIC_LIB_REQUIRE(_pthread_mutex_init); 101 /* thr_mutex_prioceiling.c */ 102 STATIC_LIB_REQUIRE(_pthread_mutexattr_getprioceiling); 103 /* thr_mutex_protocol.c */ 104 STATIC_LIB_REQUIRE(_pthread_mutexattr_getprotocol); 105 /* thr_mutexattr.c */ 106 STATIC_LIB_REQUIRE(_pthread_mutexattr_init); 107 /* thr_once.c */ 108 STATIC_LIB_REQUIRE(_pthread_once); 109 /* thr_pspinlock.c */ 110 STATIC_LIB_REQUIRE(_pthread_spin_init); 111 /* thr_resume_np.c */ 112 STATIC_LIB_REQUIRE(_pthread_resume_np); 113 /* thr_rwlock.c */ 114 STATIC_LIB_REQUIRE(_pthread_rwlock_init); 115 /* thr_rwlockattr.c */ 116 STATIC_LIB_REQUIRE(_pthread_rwlockattr_init); 117 /* thr_self.c */ 118 STATIC_LIB_REQUIRE(_pthread_self); 119 /* thr_sem.c */ 120 STATIC_LIB_REQUIRE(_sem_init); 121 /* thr_setprio.c */ 122 STATIC_LIB_REQUIRE(_pthread_setprio); 123 /* thr_setschedparam.c */ 124 STATIC_LIB_REQUIRE(_pthread_setschedparam); 125 /* thr_sig.c */ 126 STATIC_LIB_REQUIRE(_sigwait); 127 /* thr_single_np.c */ 128 STATIC_LIB_REQUIRE(_pthread_single_np); 129 /* thr_spec.c */ 130 STATIC_LIB_REQUIRE(_pthread_key_create); 131 /* thr_spinlock.c */ 132 STATIC_LIB_REQUIRE(_spinlock); 133 /* thr_suspend_np.c */ 134 STATIC_LIB_REQUIRE(_pthread_suspend_np); 135 /* thr_switch_np.c */ 136 STATIC_LIB_REQUIRE(_pthread_switch_add_np); 137 /* thr_symbols.c */ 138 STATIC_LIB_REQUIRE(_thread_state_running); 139 /* thr_syscalls.c */ 140 STATIC_LIB_REQUIRE(__wait4); 141 /* thr_yield.c */ 142 STATIC_LIB_REQUIRE(_pthread_yield); 143 144 char *_usrstack; 145 struct pthread *_thr_initial; 146 int _thread_scope_system; 147 148 pid_t _thr_pid; 149 size_t _thr_guard_default; 150 size_t _thr_stack_default = THR_STACK_DEFAULT; 151 size_t _thr_stack_initial = THR_STACK_INITIAL; 152 int _thr_page_size; 153 154 static void init_private(void); 155 static void init_main_thread(struct pthread *thread); 156 static int init_once = 0; 157 158 void _thread_init(void) __attribute__ ((constructor)); 159 void 160 _thread_init(void) 161 { 162 _libpthread_init(NULL); 163 } 164 165 /* 166 * Threaded process initialization. 167 * 168 * This is only called under two conditions: 169 * 170 * 1) Some thread routines have detected that the library hasn't yet 171 * been initialized (_thr_initial == NULL && curthread == NULL), or 172 * 173 * 2) An explicit call to reinitialize after a fork (indicated 174 * by curthread != NULL) 175 */ 176 void 177 _libpthread_init(struct pthread *curthread) 178 { 179 int fd, first = 0; 180 sigset_t sigset, oldset; 181 182 /* Check if this function has already been called: */ 183 if ((_thr_initial != NULL) && (curthread == NULL)) 184 /* Only initialize the threaded application once. */ 185 return; 186 187 /* 188 * Check for the special case of this process running as 189 * or in place of init as pid = 1: 190 */ 191 if ((_thr_pid = getpid()) == 1) { 192 /* 193 * Setup a new session for this process which is 194 * assumed to be running as root. 195 */ 196 if (setsid() == -1) 197 PANIC("Can't set session ID"); 198 if (revoke(_PATH_CONSOLE) != 0) 199 PANIC("Can't revoke console"); 200 if ((fd = __sys_open(_PATH_CONSOLE, O_RDWR)) < 0) 201 PANIC("Can't open console"); 202 if (setlogin("root") == -1) 203 PANIC("Can't set login to root"); 204 if (__sys_ioctl(fd, TIOCSCTTY, (char *) NULL) == -1) 205 PANIC("Can't set controlling terminal"); 206 } 207 208 /* Initialize pthread private data. */ 209 init_private(); 210 211 /* Set the initial thread. */ 212 if (curthread == NULL) { 213 first = 1; 214 /* Create and initialize the initial thread. */ 215 curthread = _thr_alloc(NULL); 216 if (curthread == NULL) 217 PANIC("Can't allocate initial thread"); 218 init_main_thread(curthread); 219 } 220 /* 221 * Add the thread to the thread list queue. 222 */ 223 THR_LIST_ADD(curthread); 224 _thread_active_threads = 1; 225 226 /* Setup the thread specific data */ 227 tls_set_tcb(curthread->tcb); 228 229 if (first) { 230 SIGFILLSET(sigset); 231 __sys_sigprocmask(SIG_SETMASK, &sigset, &oldset); 232 _thr_signal_init(); 233 _thr_initial = curthread; 234 SIGDELSET(oldset, SIGCANCEL); 235 __sys_sigprocmask(SIG_SETMASK, &oldset, NULL); 236 if (td_eventismember(&_thread_event_mask, TD_CREATE)) 237 _thr_report_creation(curthread, curthread); 238 } 239 } 240 241 /* 242 * This function and pthread_create() do a lot of the same things. 243 * It'd be nice to consolidate the common stuff in one place. 244 */ 245 static void 246 init_main_thread(struct pthread *thread) 247 { 248 /* Setup the thread attributes. */ 249 thread->tid = _thr_get_tid(); 250 thread->attr = _pthread_attr_default; 251 /* 252 * Set up the thread stack. 253 * 254 * Create a red zone below the main stack. All other stacks 255 * are constrained to a maximum size by the parameters 256 * passed to mmap(), but this stack is only limited by 257 * resource limits, so this stack needs an explicitly mapped 258 * red zone to protect the thread stack that is just beyond. 259 */ 260 if (mmap(_usrstack - _thr_stack_initial - 261 _thr_guard_default, _thr_guard_default, 0, MAP_ANON, 262 -1, 0) == MAP_FAILED) 263 PANIC("Cannot allocate red zone for initial thread"); 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