thr_init.c revision 84768
1/* 2 * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by John Birrell. 16 * 4. Neither the name of the author nor the names of any co-contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * $FreeBSD: head/lib/libkse/thread/thr_init.c 84768 2001-10-10 17:48:44Z bde $ 33 */ 34 35/* Allocate space for global thread variables here: */ 36#define GLOBAL_PTHREAD_PRIVATE 37 38#include "namespace.h" 39#include <sys/param.h> 40#include <sys/types.h> 41#include <machine/reg.h> 42 43#include <sys/ioctl.h> 44#include <sys/mount.h> 45#include <sys/uio.h> 46#include <sys/socket.h> 47#include <sys/event.h> 48#include <sys/stat.h> 49#include <sys/sysctl.h> 50#include <sys/time.h> 51#include <sys/ttycom.h> 52#include <sys/user.h> 53#include <sys/wait.h> 54#include <sys/mman.h> 55#include <dirent.h> 56#include <errno.h> 57#include <fcntl.h> 58#include <paths.h> 59#include <poll.h> 60#include <pthread.h> 61#include <signal.h> 62#include <stdio.h> 63#include <stdlib.h> 64#include <string.h> 65#include <unistd.h> 66#include "un-namespace.h" 67 68#include "pthread_private.h" 69 70/* 71 * All weak references used within libc should be in this table. 72 * This will is so that static libraries will work. 73 */ 74static void *references[] = { 75 &_accept, 76 &_bind, 77 &_close, 78 &_connect, 79 &_dup, 80 &_dup2, 81 &_execve, 82 &_fcntl, 83 &_flock, 84 &_flockfile, 85 &_fstat, 86 &_fstatfs, 87 &_fsync, 88 &_funlockfile, 89 &_getdirentries, 90 &_getlogin, 91 &_getpeername, 92 &_getsockname, 93 &_getsockopt, 94 &_ioctl, 95 &_kevent, 96 &_listen, 97 &_nanosleep, 98 &_open, 99 &_pthread_getspecific, 100 &_pthread_key_create, 101 &_pthread_key_delete, 102 &_pthread_mutex_destroy, 103 &_pthread_mutex_init, 104 &_pthread_mutex_lock, 105 &_pthread_mutex_trylock, 106 &_pthread_mutex_unlock, 107 &_pthread_mutexattr_init, 108 &_pthread_mutexattr_destroy, 109 &_pthread_mutexattr_settype, 110 &_pthread_once, 111 &_pthread_setspecific, 112 &_read, 113 &_readv, 114 &_recvfrom, 115 &_recvmsg, 116 &_select, 117 &_sendmsg, 118 &_sendto, 119 &_setsockopt, 120 &_sigaction, 121 &_sigprocmask, 122 &_sigsuspend, 123 &_socket, 124 &_socketpair, 125 &_wait4, 126 &_write, 127 &_writev 128}; 129 130/* 131 * These are needed when linking statically. All references within 132 * libgcc (and in the future libc) to these routines are weak, but 133 * if they are not (strongly) referenced by the application or other 134 * libraries, then the actual functions will not be loaded. 135 */ 136static void *libgcc_references[] = { 137 &_pthread_once, 138 &_pthread_key_create, 139 &_pthread_key_delete, 140 &_pthread_getspecific, 141 &_pthread_setspecific, 142 &_pthread_mutex_init, 143 &_pthread_mutex_destroy, 144 &_pthread_mutex_lock, 145 &_pthread_mutex_trylock, 146 &_pthread_mutex_unlock 147}; 148 149 150/* 151 * Threaded process initialization 152 */ 153void 154_thread_init(void) 155{ 156 int fd; 157 int flags; 158 int i; 159 size_t len; 160 int mib[2]; 161 struct clockinfo clockinfo; 162 struct sigaction act; 163 164 /* Check if this function has already been called: */ 165 if (_thread_initial) 166 /* Only initialise the threaded application once. */ 167 return; 168 169 /* 170 * Make gcc quiescent about {,libgcc_}references not being 171 * referenced: 172 */ 173 if ((references[0] == NULL) || (libgcc_references[0] == NULL)) 174 PANIC("Failed loading mandatory references in _thread_init"); 175 176 /* 177 * Check for the special case of this process running as 178 * or in place of init as pid = 1: 179 */ 180 if (getpid() == 1) { 181 /* 182 * Setup a new session for this process which is 183 * assumed to be running as root. 184 */ 185 if (setsid() == -1) 186 PANIC("Can't set session ID"); 187 if (revoke(_PATH_CONSOLE) != 0) 188 PANIC("Can't revoke console"); 189 if ((fd = __sys_open(_PATH_CONSOLE, O_RDWR)) < 0) 190 PANIC("Can't open console"); 191 if (setlogin("root") == -1) 192 PANIC("Can't set login to root"); 193 if (__sys_ioctl(fd,TIOCSCTTY, (char *) NULL) == -1) 194 PANIC("Can't set controlling terminal"); 195 if (__sys_dup2(fd,0) == -1 || 196 __sys_dup2(fd,1) == -1 || 197 __sys_dup2(fd,2) == -1) 198 PANIC("Can't dup2"); 199 } 200 201 /* Get the standard I/O flags before messing with them : */ 202 for (i = 0; i < 3; i++) 203 if (((_pthread_stdio_flags[i] = 204 __sys_fcntl(i,F_GETFL, NULL)) == -1) && 205 (errno != EBADF)) 206 PANIC("Cannot get stdio flags"); 207 208 /* 209 * Create a pipe that is written to by the signal handler to prevent 210 * signals being missed in calls to _select: 211 */ 212 if (__sys_pipe(_thread_kern_pipe) != 0) { 213 /* Cannot create pipe, so abort: */ 214 PANIC("Cannot create kernel pipe"); 215 } 216 /* Get the flags for the read pipe: */ 217 else if ((flags = __sys_fcntl(_thread_kern_pipe[0], F_GETFL, NULL)) == -1) { 218 /* Abort this application: */ 219 PANIC("Cannot get kernel read pipe flags"); 220 } 221 /* Make the read pipe non-blocking: */ 222 else if (__sys_fcntl(_thread_kern_pipe[0], F_SETFL, flags | O_NONBLOCK) == -1) { 223 /* Abort this application: */ 224 PANIC("Cannot make kernel read pipe non-blocking"); 225 } 226 /* Get the flags for the write pipe: */ 227 else if ((flags = __sys_fcntl(_thread_kern_pipe[1], F_GETFL, NULL)) == -1) { 228 /* Abort this application: */ 229 PANIC("Cannot get kernel write pipe flags"); 230 } 231 /* Make the write pipe non-blocking: */ 232 else if (__sys_fcntl(_thread_kern_pipe[1], F_SETFL, flags | O_NONBLOCK) == -1) { 233 /* Abort this application: */ 234 PANIC("Cannot get kernel write pipe flags"); 235 } 236 /* Allocate and initialize the ready queue: */ 237 else if (_pq_alloc(&_readyq, PTHREAD_MIN_PRIORITY, PTHREAD_LAST_PRIORITY) != 0) { 238 /* Abort this application: */ 239 PANIC("Cannot allocate priority ready queue."); 240 } 241 /* Allocate memory for the thread structure of the initial thread: */ 242 else if ((_thread_initial = (pthread_t) malloc(sizeof(struct pthread))) == NULL) { 243 /* 244 * Insufficient memory to initialise this application, so 245 * abort: 246 */ 247 PANIC("Cannot allocate memory for initial thread"); 248 } 249 /* Allocate memory for the scheduler stack: */ 250 else if ((_thread_kern_sched_stack = malloc(SCHED_STACK_SIZE)) == NULL) 251 PANIC("Failed to allocate stack for scheduler"); 252 else { 253 /* Zero the global kernel thread structure: */ 254 memset(&_thread_kern_thread, 0, sizeof(struct pthread)); 255 _thread_kern_thread.flags = PTHREAD_FLAGS_PRIVATE; 256 memset(_thread_initial, 0, sizeof(struct pthread)); 257 258 /* Initialize the waiting and work queues: */ 259 TAILQ_INIT(&_waitingq); 260 TAILQ_INIT(&_workq); 261 262 /* Initialize the scheduling switch hook routine: */ 263 _sched_switch_hook = NULL; 264 265 /* Give this thread default attributes: */ 266 memcpy((void *) &_thread_initial->attr, &pthread_attr_default, 267 sizeof(struct pthread_attr)); 268 269 /* 270 * Create a red zone below the main stack. All other stacks are 271 * constrained to a maximum size by the paramters passed to 272 * mmap(), but this stack is only limited by resource limits, so 273 * this stack needs an explicitly mapped red zone to protect the 274 * thread stack that is just beyond. 275 */ 276 if (mmap((void *) USRSTACK - PTHREAD_STACK_INITIAL - 277 PTHREAD_GUARD_DEFAULT, PTHREAD_GUARD_DEFAULT, 0, MAP_ANON, 278 -1, 0) == MAP_FAILED) 279 PANIC("Cannot allocate red zone for initial thread"); 280 281 /* Set the main thread stack pointer. */ 282 _thread_initial->stack = (void *) USRSTACK - 283 PTHREAD_STACK_INITIAL; 284 285 /* Set the stack attributes: */ 286 _thread_initial->attr.stackaddr_attr = _thread_initial->stack; 287 _thread_initial->attr.stacksize_attr = PTHREAD_STACK_INITIAL; 288 289 /* Setup the context for the scheduler: */ 290 _setjmp(_thread_kern_sched_jb); 291 SET_STACK_JB(_thread_kern_sched_jb, _thread_kern_sched_stack + 292 SCHED_STACK_SIZE - sizeof(double)); 293 SET_RETURN_ADDR_JB(_thread_kern_sched_jb, _thread_kern_scheduler); 294 295 /* 296 * Write a magic value to the thread structure 297 * to help identify valid ones: 298 */ 299 _thread_initial->magic = PTHREAD_MAGIC; 300 301 /* Set the initial cancel state */ 302 _thread_initial->cancelflags = PTHREAD_CANCEL_ENABLE | 303 PTHREAD_CANCEL_DEFERRED; 304 305 /* Default the priority of the initial thread: */ 306 _thread_initial->base_priority = PTHREAD_DEFAULT_PRIORITY; 307 _thread_initial->active_priority = PTHREAD_DEFAULT_PRIORITY; 308 _thread_initial->inherited_priority = 0; 309 310 /* Initialise the state of the initial thread: */ 311 _thread_initial->state = PS_RUNNING; 312 313 /* Set the name of the thread: */ 314 _thread_initial->name = strdup("_thread_initial"); 315 316 /* Initialize joiner to NULL (no joiner): */ 317 _thread_initial->joiner = NULL; 318 319 /* Initialize the owned mutex queue and count: */ 320 TAILQ_INIT(&(_thread_initial->mutexq)); 321 _thread_initial->priority_mutex_count = 0; 322 323 /* Initialize the global scheduling time: */ 324 _sched_ticks = 0; 325 gettimeofday((struct timeval *) &_sched_tod, NULL); 326 327 /* Initialize last active: */ 328 _thread_initial->last_active = (long) _sched_ticks; 329 330 /* Initialize the initial context: */ 331 _thread_initial->curframe = NULL; 332 _thread_initial->ctxtype = CTX_JB_NOSIG; 333 334 /* Initialise the rest of the fields: */ 335 _thread_initial->poll_data.nfds = 0; 336 _thread_initial->poll_data.fds = NULL; 337 _thread_initial->sig_defer_count = 0; 338 _thread_initial->yield_on_sig_undefer = 0; 339 _thread_initial->specific_data = NULL; 340 _thread_initial->cleanup = NULL; 341 _thread_initial->flags = 0; 342 _thread_initial->error = 0; 343 TAILQ_INIT(&_thread_list); 344 TAILQ_INSERT_HEAD(&_thread_list, _thread_initial, tle); 345 _set_curthread(_thread_initial); 346 347 /* Initialise the global signal action structure: */ 348 sigfillset(&act.sa_mask); 349 act.sa_handler = (void (*) ()) _thread_sig_handler; 350 act.sa_flags = SA_SIGINFO | SA_ONSTACK; 351 352 /* Clear pending signals for the process: */ 353 sigemptyset(&_process_sigpending); 354 355 /* Clear the signal queue: */ 356 memset(_thread_sigq, 0, sizeof(_thread_sigq)); 357 358 /* 359 * Create and install an alternate signal stack of 360 * the recommended size: 361 */ 362 _thread_sigstack.ss_sp = malloc(SIGSTKSZ); 363 _thread_sigstack.ss_size = SIGSTKSZ; 364 _thread_sigstack.ss_flags = 0; 365 if ((_thread_sigstack.ss_sp == NULL) || 366 (__sys_sigaltstack(&_thread_sigstack, NULL) != 0)) 367 PANIC("Unable to install alternate signal stack"); 368 369 /* Enter a loop to get the existing signal status: */ 370 for (i = 1; i < NSIG; i++) { 371 /* Check for signals which cannot be trapped: */ 372 if (i == SIGKILL || i == SIGSTOP) { 373 } 374 375 /* Get the signal handler details: */ 376 else if (__sys_sigaction(i, NULL, 377 &_thread_sigact[i - 1]) != 0) { 378 /* 379 * Abort this process if signal 380 * initialisation fails: 381 */ 382 PANIC("Cannot read signal handler info"); 383 } 384 385 /* Initialize the SIG_DFL dummy handler count. */ 386 _thread_dfl_count[i] = 0; 387 } 388 389 /* 390 * Install the signal handler for the most important 391 * signals that the user-thread kernel needs. Actually 392 * SIGINFO isn't really needed, but it is nice to have. 393 */ 394 if (__sys_sigaction(_SCHED_SIGNAL, &act, NULL) != 0 || 395 __sys_sigaction(SIGINFO, &act, NULL) != 0 || 396 __sys_sigaction(SIGCHLD, &act, NULL) != 0) { 397 /* 398 * Abort this process if signal initialisation fails: 399 */ 400 PANIC("Cannot initialise signal handler"); 401 } 402 _thread_sigact[_SCHED_SIGNAL - 1].sa_flags = SA_SIGINFO; 403 _thread_sigact[SIGINFO - 1].sa_flags = SA_SIGINFO; 404 _thread_sigact[SIGCHLD - 1].sa_flags = SA_SIGINFO; 405 406 /* Get the process signal mask: */ 407 __sys_sigprocmask(SIG_SETMASK, NULL, &_process_sigmask); 408 409 /* Get the kernel clockrate: */ 410 mib[0] = CTL_KERN; 411 mib[1] = KERN_CLOCKRATE; 412 len = sizeof (struct clockinfo); 413 if (sysctl(mib, 2, &clockinfo, &len, NULL, 0) == 0) 414 _clock_res_usec = clockinfo.tick > CLOCK_RES_USEC_MIN ? 415 clockinfo.tick : CLOCK_RES_USEC_MIN; 416 417 /* Get the table size: */ 418 if ((_thread_dtablesize = getdtablesize()) < 0) { 419 /* 420 * Cannot get the system defined table size, so abort 421 * this process. 422 */ 423 PANIC("Cannot get dtablesize"); 424 } 425 /* Allocate memory for the file descriptor table: */ 426 if ((_thread_fd_table = (struct fd_table_entry **) malloc(sizeof(struct fd_table_entry *) * _thread_dtablesize)) == NULL) { 427 /* Avoid accesses to file descriptor table on exit: */ 428 _thread_dtablesize = 0; 429 430 /* 431 * Cannot allocate memory for the file descriptor 432 * table, so abort this process. 433 */ 434 PANIC("Cannot allocate memory for file descriptor table"); 435 } 436 /* Allocate memory for the pollfd table: */ 437 if ((_thread_pfd_table = (struct pollfd *) malloc(sizeof(struct pollfd) * _thread_dtablesize)) == NULL) { 438 /* 439 * Cannot allocate memory for the file descriptor 440 * table, so abort this process. 441 */ 442 PANIC("Cannot allocate memory for pollfd table"); 443 } else { 444 /* 445 * Enter a loop to initialise the file descriptor 446 * table: 447 */ 448 for (i = 0; i < _thread_dtablesize; i++) { 449 /* Initialise the file descriptor table: */ 450 _thread_fd_table[i] = NULL; 451 } 452 453 /* Initialize stdio file descriptor table entries: */ 454 for (i = 0; i < 3; i++) { 455 if ((_thread_fd_table_init(i) != 0) && 456 (errno != EBADF)) 457 PANIC("Cannot initialize stdio file " 458 "descriptor table entry"); 459 } 460 } 461 } 462 463 /* Initialise the garbage collector mutex and condition variable. */ 464 if (_pthread_mutex_init(&_gc_mutex,NULL) != 0 || 465 pthread_cond_init(&_gc_cond,NULL) != 0) 466 PANIC("Failed to initialise garbage collector mutex or condvar"); 467} 468 469/* 470 * Special start up code for NetBSD/Alpha 471 */ 472#if defined(__NetBSD__) && defined(__alpha__) 473int 474main(int argc, char *argv[], char *env); 475 476int 477_thread_main(int argc, char *argv[], char *env) 478{ 479 _thread_init(); 480 return (main(argc, argv, env)); 481} 482#endif 483