thr_init.c revision 80021
121308Sache/* 221308Sache * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au> 321308Sache * All rights reserved. 421308Sache * 521308Sache * Redistribution and use in source and binary forms, with or without 621308Sache * modification, are permitted provided that the following conditions 7119610Sache * are met: 8119610Sache * 1. Redistributions of source code must retain the above copyright 9119610Sache * notice, this list of conditions and the following disclaimer. 10119610Sache * 2. Redistributions in binary form must reproduce the above copyright 11119610Sache * notice, this list of conditions and the following disclaimer in the 12119610Sache * documentation and/or other materials provided with the distribution. 13119610Sache * 3. All advertising materials mentioning features or use of this software 14119610Sache * must display the following acknowledgement: 15119610Sache * This product includes software developed by John Birrell. 16119610Sache * 4. Neither the name of the author nor the names of any co-contributors 17119610Sache * may be used to endorse or promote products derived from this software 18119610Sache * without specific prior written permission. 19119610Sache * 20119610Sache * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND 21119610Sache * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22119610Sache * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23119610Sache * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 24119610Sache * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25119610Sache * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26119610Sache * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2726497Sache * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2826497Sache * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2926497Sache * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3026497Sache * SUCH DAMAGE. 3121308Sache * 3221308Sache * $FreeBSD: head/lib/libkse/thread/thr_init.c 80021 2001-07-20 04:23:11Z jasone $ 3321308Sache */ 34157184Sache 35157184Sache/* Allocate space for global thread variables here: */ 36157184Sache#define GLOBAL_PTHREAD_PRIVATE 37157184Sache 38157184Sache#include "namespace.h" 39157184Sache#include <sys/param.h> 4058310Sache#include <sys/lock.h> 4158310Sache#include <sys/mutex.h> 4258310Sache#include <sys/types.h> 4358310Sache#include <machine/reg.h> 4458310Sache 4558310Sache#include <sys/ioctl.h> 4658310Sache#include <sys/mount.h> 4758310Sache#include <sys/uio.h> 4835486Sache#include <sys/socket.h> 4935486Sache#include <sys/event.h> 5021308Sache#include <sys/stat.h> 5121308Sache#include <sys/sysctl.h> 5235486Sache#include <sys/time.h> 5335486Sache#include <sys/ttycom.h> 5421308Sache#include <sys/user.h> 5535486Sache#include <sys/wait.h> 5635486Sache#include <sys/mman.h> 5735486Sache#include <dirent.h> 5835486Sache#include <errno.h> 5921308Sache#include <fcntl.h> 6021308Sache#include <paths.h> 6121308Sache#include <poll.h> 6221308Sache#include <pthread.h> 6321308Sache#include <signal.h> 6421308Sache#include <stdio.h> 6521308Sache#include <stdlib.h> 6621308Sache#include <string.h> 6721308Sache#include <unistd.h> 6821308Sache#include "un-namespace.h" 6921308Sache 7021308Sache#include "pthread_private.h" 7121308Sache 7221308Sache/* 7321308Sache * All weak references used within libc should be in this table. 7421308Sache * This will is so that static libraries will work. 7521308Sache */ 7621308Sachestatic void *references[] = { 7721308Sache &_accept, 7821308Sache &_bind, 7921308Sache &_close, 8035486Sache &_connect, 8121308Sache &_dup, 8235486Sache &_dup2, 8335486Sache &_execve, 8421308Sache &_fcntl, 8521308Sache &_flock, 8621308Sache &_flockfile, 8735486Sache &_fstat, 8821308Sache &_fstatfs, 8921308Sache &_fsync, 9021308Sache &_funlockfile, 9121308Sache &_getdirentries, 9235486Sache &_getlogin, 9321308Sache &_getpeername, 94 &_getsockname, 95 &_getsockopt, 96 &_ioctl, 97 &_kevent, 98 &_listen, 99 &_nanosleep, 100 &_open, 101 &_pthread_getspecific, 102 &_pthread_key_create, 103 &_pthread_key_delete, 104 &_pthread_mutex_destroy, 105 &_pthread_mutex_init, 106 &_pthread_mutex_lock, 107 &_pthread_mutex_trylock, 108 &_pthread_mutex_unlock, 109 &_pthread_mutexattr_init, 110 &_pthread_mutexattr_destroy, 111 &_pthread_mutexattr_settype, 112 &_pthread_once, 113 &_pthread_setspecific, 114 &_read, 115 &_readv, 116 &_recvfrom, 117 &_recvmsg, 118 &_select, 119 &_sendmsg, 120 &_sendto, 121 &_setsockopt, 122 &_sigaction, 123 &_sigprocmask, 124 &_sigsuspend, 125 &_socket, 126 &_socketpair, 127 &_wait4, 128 &_write, 129 &_writev 130}; 131 132/* 133 * These are needed when linking statically. All references within 134 * libgcc (and in the future libc) to these routines are weak, but 135 * if they are not (strongly) referenced by the application or other 136 * libraries, then the actual functions will not be loaded. 137 */ 138static void *libgcc_references[] = { 139 &_pthread_once, 140 &_pthread_key_create, 141 &_pthread_key_delete, 142 &_pthread_getspecific, 143 &_pthread_setspecific, 144 &_pthread_mutex_init, 145 &_pthread_mutex_destroy, 146 &_pthread_mutex_lock, 147 &_pthread_mutex_trylock, 148 &_pthread_mutex_unlock 149}; 150 151 152/* 153 * Threaded process initialization 154 */ 155void 156_thread_init(void) 157{ 158 int fd; 159 int flags; 160 int i; 161 size_t len; 162 int mib[2]; 163 struct clockinfo clockinfo; 164 struct sigaction act; 165 166 /* Check if this function has already been called: */ 167 if (_thread_initial) 168 /* Only initialise the threaded application once. */ 169 return; 170 171 /* 172 * Make gcc quiescent about {,libgcc_}references not being 173 * referenced: 174 */ 175 if ((references[0] == NULL) || (libgcc_references[0] == NULL)) 176 PANIC("Failed loading mandatory references in _thread_init"); 177 178 /* 179 * Check for the special case of this process running as 180 * or in place of init as pid = 1: 181 */ 182 if (getpid() == 1) { 183 /* 184 * Setup a new session for this process which is 185 * assumed to be running as root. 186 */ 187 if (setsid() == -1) 188 PANIC("Can't set session ID"); 189 if (revoke(_PATH_CONSOLE) != 0) 190 PANIC("Can't revoke console"); 191 if ((fd = __sys_open(_PATH_CONSOLE, O_RDWR)) < 0) 192 PANIC("Can't open console"); 193 if (setlogin("root") == -1) 194 PANIC("Can't set login to root"); 195 if (__sys_ioctl(fd,TIOCSCTTY, (char *) NULL) == -1) 196 PANIC("Can't set controlling terminal"); 197 if (__sys_dup2(fd,0) == -1 || 198 __sys_dup2(fd,1) == -1 || 199 __sys_dup2(fd,2) == -1) 200 PANIC("Can't dup2"); 201 } 202 203 /* Get the standard I/O flags before messing with them : */ 204 for (i = 0; i < 3; i++) 205 if (((_pthread_stdio_flags[i] = 206 __sys_fcntl(i,F_GETFL, NULL)) == -1) && 207 (errno != EBADF)) 208 PANIC("Cannot get stdio flags"); 209 210 /* 211 * Create a pipe that is written to by the signal handler to prevent 212 * signals being missed in calls to _select: 213 */ 214 if (__sys_pipe(_thread_kern_pipe) != 0) { 215 /* Cannot create pipe, so abort: */ 216 PANIC("Cannot create kernel pipe"); 217 } 218 /* Get the flags for the read pipe: */ 219 else if ((flags = __sys_fcntl(_thread_kern_pipe[0], F_GETFL, NULL)) == -1) { 220 /* Abort this application: */ 221 PANIC("Cannot get kernel read pipe flags"); 222 } 223 /* Make the read pipe non-blocking: */ 224 else if (__sys_fcntl(_thread_kern_pipe[0], F_SETFL, flags | O_NONBLOCK) == -1) { 225 /* Abort this application: */ 226 PANIC("Cannot make kernel read pipe non-blocking"); 227 } 228 /* Get the flags for the write pipe: */ 229 else if ((flags = __sys_fcntl(_thread_kern_pipe[1], F_GETFL, NULL)) == -1) { 230 /* Abort this application: */ 231 PANIC("Cannot get kernel write pipe flags"); 232 } 233 /* Make the write pipe non-blocking: */ 234 else if (__sys_fcntl(_thread_kern_pipe[1], F_SETFL, flags | O_NONBLOCK) == -1) { 235 /* Abort this application: */ 236 PANIC("Cannot get kernel write pipe flags"); 237 } 238 /* Allocate and initialize the ready queue: */ 239 else if (_pq_alloc(&_readyq, PTHREAD_MIN_PRIORITY, PTHREAD_LAST_PRIORITY) != 0) { 240 /* Abort this application: */ 241 PANIC("Cannot allocate priority ready queue."); 242 } 243 /* Allocate memory for the thread structure of the initial thread: */ 244 else if ((_thread_initial = (pthread_t) malloc(sizeof(struct pthread))) == NULL) { 245 /* 246 * Insufficient memory to initialise this application, so 247 * abort: 248 */ 249 PANIC("Cannot allocate memory for initial thread"); 250 } 251 /* Allocate memory for the scheduler stack: */ 252 else if ((_thread_kern_sched_stack = malloc(SCHED_STACK_SIZE)) == NULL) 253 PANIC("Failed to allocate stack for scheduler"); 254 else { 255 /* Zero the global kernel thread structure: */ 256 memset(&_thread_kern_thread, 0, sizeof(struct pthread)); 257 _thread_kern_thread.flags = PTHREAD_FLAGS_PRIVATE; 258 memset(_thread_initial, 0, sizeof(struct pthread)); 259 260 /* Initialize the waiting and work queues: */ 261 TAILQ_INIT(&_waitingq); 262 TAILQ_INIT(&_workq); 263 264 /* Initialize the scheduling switch hook routine: */ 265 _sched_switch_hook = NULL; 266 267 /* Give this thread default attributes: */ 268 memcpy((void *) &_thread_initial->attr, &pthread_attr_default, 269 sizeof(struct pthread_attr)); 270 271 /* 272 * Create a red zone below the main stack. All other stacks are 273 * constrained to a maximum size by the paramters passed to 274 * mmap(), but this stack is only limited by resource limits, so 275 * this stack needs an explicitly mapped red zone to protect the 276 * thread stack that is just beyond. 277 */ 278 if (mmap((void *) USRSTACK - PTHREAD_STACK_INITIAL - 279 PTHREAD_GUARD_DEFAULT, PTHREAD_GUARD_DEFAULT, 0, MAP_ANON, 280 -1, 0) == MAP_FAILED) 281 PANIC("Cannot allocate red zone for initial thread"); 282 283 /* Set the main thread stack pointer. */ 284 _thread_initial->stack = (void *) USRSTACK - 285 PTHREAD_STACK_INITIAL; 286 287 /* Set the stack attributes: */ 288 _thread_initial->attr.stackaddr_attr = _thread_initial->stack; 289 _thread_initial->attr.stacksize_attr = PTHREAD_STACK_INITIAL; 290 291 /* Setup the context for the scheduler: */ 292 _setjmp(_thread_kern_sched_jb); 293 SET_STACK_JB(_thread_kern_sched_jb, _thread_kern_sched_stack + 294 SCHED_STACK_SIZE - sizeof(double)); 295 SET_RETURN_ADDR_JB(_thread_kern_sched_jb, _thread_kern_scheduler); 296 297 /* 298 * Write a magic value to the thread structure 299 * to help identify valid ones: 300 */ 301 _thread_initial->magic = PTHREAD_MAGIC; 302 303 /* Set the initial cancel state */ 304 _thread_initial->cancelflags = PTHREAD_CANCEL_ENABLE | 305 PTHREAD_CANCEL_DEFERRED; 306 307 /* Default the priority of the initial thread: */ 308 _thread_initial->base_priority = PTHREAD_DEFAULT_PRIORITY; 309 _thread_initial->active_priority = PTHREAD_DEFAULT_PRIORITY; 310 _thread_initial->inherited_priority = 0; 311 312 /* Initialise the state of the initial thread: */ 313 _thread_initial->state = PS_RUNNING; 314 315 /* Set the name of the thread: */ 316 _thread_initial->name = strdup("_thread_initial"); 317 318 /* Initialize joiner to NULL (no joiner): */ 319 _thread_initial->joiner = NULL; 320 321 /* Initialize the owned mutex queue and count: */ 322 TAILQ_INIT(&(_thread_initial->mutexq)); 323 _thread_initial->priority_mutex_count = 0; 324 325 /* Initialize the global scheduling time: */ 326 _sched_ticks = 0; 327 gettimeofday((struct timeval *) &_sched_tod, NULL); 328 329 /* Initialize last active: */ 330 _thread_initial->last_active = (long) _sched_ticks; 331 332 /* Initialize the initial context: */ 333 _thread_initial->curframe = NULL; 334 _thread_initial->ctxtype = CTX_JB_NOSIG; 335 336 /* Initialise the rest of the fields: */ 337 _thread_initial->poll_data.nfds = 0; 338 _thread_initial->poll_data.fds = NULL; 339 _thread_initial->sig_defer_count = 0; 340 _thread_initial->yield_on_sig_undefer = 0; 341 _thread_initial->specific_data = NULL; 342 _thread_initial->cleanup = NULL; 343 _thread_initial->flags = 0; 344 _thread_initial->error = 0; 345 TAILQ_INIT(&_thread_list); 346 TAILQ_INSERT_HEAD(&_thread_list, _thread_initial, tle); 347 _set_curthread(_thread_initial); 348 349 /* Initialise the global signal action structure: */ 350 sigfillset(&act.sa_mask); 351 act.sa_handler = (void (*) ()) _thread_sig_handler; 352 act.sa_flags = SA_SIGINFO | SA_ONSTACK; 353 354 /* Clear pending signals for the process: */ 355 sigemptyset(&_process_sigpending); 356 357 /* Clear the signal queue: */ 358 memset(_thread_sigq, 0, sizeof(_thread_sigq)); 359 360 /* 361 * Create and install an alternate signal stack of 362 * the recommended size: 363 */ 364 _thread_sigstack.ss_sp = malloc(SIGSTKSZ); 365 _thread_sigstack.ss_size = SIGSTKSZ; 366 _thread_sigstack.ss_flags = 0; 367 if ((_thread_sigstack.ss_sp == NULL) || 368 (__sys_sigaltstack(&_thread_sigstack, NULL) != 0)) 369 PANIC("Unable to install alternate signal stack"); 370 371 /* Enter a loop to get the existing signal status: */ 372 for (i = 1; i < NSIG; i++) { 373 /* Check for signals which cannot be trapped: */ 374 if (i == SIGKILL || i == SIGSTOP) { 375 } 376 377 /* Get the signal handler details: */ 378 else if (__sys_sigaction(i, NULL, 379 &_thread_sigact[i - 1]) != 0) { 380 /* 381 * Abort this process if signal 382 * initialisation fails: 383 */ 384 PANIC("Cannot read signal handler info"); 385 } 386 387 /* Initialize the SIG_DFL dummy handler count. */ 388 _thread_dfl_count[i] = 0; 389 } 390 391 /* 392 * Install the signal handler for the most important 393 * signals that the user-thread kernel needs. Actually 394 * SIGINFO isn't really needed, but it is nice to have. 395 */ 396 if (__sys_sigaction(_SCHED_SIGNAL, &act, NULL) != 0 || 397 __sys_sigaction(SIGINFO, &act, NULL) != 0 || 398 __sys_sigaction(SIGCHLD, &act, NULL) != 0) { 399 /* 400 * Abort this process if signal initialisation fails: 401 */ 402 PANIC("Cannot initialise signal handler"); 403 } 404 _thread_sigact[_SCHED_SIGNAL - 1].sa_flags = SA_SIGINFO; 405 _thread_sigact[SIGINFO - 1].sa_flags = SA_SIGINFO; 406 _thread_sigact[SIGCHLD - 1].sa_flags = SA_SIGINFO; 407 408 /* Get the process signal mask: */ 409 __sys_sigprocmask(SIG_SETMASK, NULL, &_process_sigmask); 410 411 /* Get the kernel clockrate: */ 412 mib[0] = CTL_KERN; 413 mib[1] = KERN_CLOCKRATE; 414 len = sizeof (struct clockinfo); 415 if (sysctl(mib, 2, &clockinfo, &len, NULL, 0) == 0) 416 _clock_res_usec = clockinfo.tick > CLOCK_RES_USEC_MIN ? 417 clockinfo.tick : CLOCK_RES_USEC_MIN; 418 419 /* Get the table size: */ 420 if ((_thread_dtablesize = getdtablesize()) < 0) { 421 /* 422 * Cannot get the system defined table size, so abort 423 * this process. 424 */ 425 PANIC("Cannot get dtablesize"); 426 } 427 /* Allocate memory for the file descriptor table: */ 428 if ((_thread_fd_table = (struct fd_table_entry **) malloc(sizeof(struct fd_table_entry *) * _thread_dtablesize)) == NULL) { 429 /* Avoid accesses to file descriptor table on exit: */ 430 _thread_dtablesize = 0; 431 432 /* 433 * Cannot allocate memory for the file descriptor 434 * table, so abort this process. 435 */ 436 PANIC("Cannot allocate memory for file descriptor table"); 437 } 438 /* Allocate memory for the pollfd table: */ 439 if ((_thread_pfd_table = (struct pollfd *) malloc(sizeof(struct pollfd) * _thread_dtablesize)) == NULL) { 440 /* 441 * Cannot allocate memory for the file descriptor 442 * table, so abort this process. 443 */ 444 PANIC("Cannot allocate memory for pollfd table"); 445 } else { 446 /* 447 * Enter a loop to initialise the file descriptor 448 * table: 449 */ 450 for (i = 0; i < _thread_dtablesize; i++) { 451 /* Initialise the file descriptor table: */ 452 _thread_fd_table[i] = NULL; 453 } 454 455 /* Initialize stdio file descriptor table entries: */ 456 for (i = 0; i < 3; i++) { 457 if ((_thread_fd_table_init(i) != 0) && 458 (errno != EBADF)) 459 PANIC("Cannot initialize stdio file " 460 "descriptor table entry"); 461 } 462 } 463 } 464 465 /* Initialise the garbage collector mutex and condition variable. */ 466 if (_pthread_mutex_init(&_gc_mutex,NULL) != 0 || 467 pthread_cond_init(&_gc_cond,NULL) != 0) 468 PANIC("Failed to initialise garbage collector mutex or condvar"); 469} 470 471/* 472 * Special start up code for NetBSD/Alpha 473 */ 474#if defined(__NetBSD__) && defined(__alpha__) 475int 476main(int argc, char *argv[], char *env); 477 478int 479_thread_main(int argc, char *argv[], char *env) 480{ 481 _thread_init(); 482 return (main(argc, argv, env)); 483} 484#endif 485