lib/libc_r/uthread/uthread_init.c

   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. Neither the name of the author nor the names of any co-contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * $FreeBSD$
  30  */
  31
  32 /* Allocate space for global thread variables here: */
  33 #define GLOBAL_PTHREAD_PRIVATE
  34
  35 #include "namespace.h"
  36 #include <sys/param.h>
  37 #include <sys/types.h>
  38 #include <machine/reg.h>
  39
  40 #include <sys/ioctl.h>
  41 #include <sys/mount.h>
  42 #include <sys/uio.h>
  43 #include <sys/socket.h>
  44 #include <sys/event.h>
  45 #include <sys/stat.h>
  46 #include <sys/sysctl.h>
  47 #include <sys/time.h>
  48 #include <sys/ttycom.h>
  49 #include <sys/wait.h>
  50 #include <sys/mman.h>
  51 #include <dirent.h>
  52 #include <errno.h>
  53 #include <fcntl.h>
  54 #include <paths.h>
  55 #include <poll.h>
  56 #include <pthread.h>
  57 #include <pthread_np.h>
  58 #include <signal.h>
  59 #include <stdio.h>
  60 #include <stdlib.h>
  61 #include <string.h>
  62 #include <unistd.h>
  63 #include "un-namespace.h"
  64
  65 #include "libc_private.h"
  66 #include "pthread_private.h"
  67
  68 int     __pthread_cond_wait(pthread_cond_t *, pthread_mutex_t *);
  69 int     __pthread_mutex_lock(pthread_mutex_t *);
  70 int     __pthread_mutex_trylock(pthread_mutex_t *);
  71
  72 /*
  73  * All weak references used within libc should be in this table.
  74  * This allows static libraries to work.
  75  */
  76 static void *references[] = {
  77         &_accept,
  78         &_bind,
  79         &_close,
  80         &_connect,
  81         &_dup,
  82         &_dup2,
  83         &_execve,
  84         &_fcntl,
  85         &_flock,
  86         &_flockfile,
  87         &_fstat,
  88         &_fstatfs,
  89         &_fsync,
  90         &_funlockfile,
  91         &_getdirentries,
  92         &_getlogin,
  93         &_getpeername,
  94         &_getsockname,
  95         &_getsockopt,
  96         &_ioctl,
  97         &_kevent,
  98         &_kqueue,
  99         &_listen,
 100         &_nanosleep,
 101         &_open,
 102         &_pthread_cond_destroy,
 103         &_pthread_cond_init,
 104         &_pthread_cond_signal,
 105         &_pthread_cond_wait,
 106         &_pthread_getspecific,
 107         &_pthread_key_create,
 108         &_pthread_key_delete,
 109         &_pthread_mutex_destroy,
 110         &_pthread_mutex_init,
 111         &_pthread_mutex_lock,
 112         &_pthread_mutex_trylock,
 113         &_pthread_mutex_unlock,
 114         &_pthread_mutexattr_init,
 115         &_pthread_mutexattr_destroy,
 116         &_pthread_mutexattr_settype,
 117         &_pthread_once,
 118         &_pthread_setspecific,
 119         &_read,
 120         &_readv,
 121         &_recvfrom,
 122         &_recvmsg,
 123         &_select,
 124         &_sendmsg,
 125         &_sendto,
 126         &_setsockopt,
 127         &_sigaction,
 128         &_sigprocmask,
 129         &_sigsuspend,
 130         &_socket,
 131         &_socketpair,
 132         &_wait4,
 133         &_write,
 134         &_writev
 135 };
 136
 137 /*
 138  * These are needed when linking statically.  All references within
 139  * libgcc (and libc) to these routines are weak, but if they are not
 140  * (strongly) referenced by the application or other libraries, then
 141  * the actual functions will not be loaded.
 142  */
 143 static void *libgcc_references[] = {
 144         &_pthread_once,
 145         &_pthread_key_create,
 146         &_pthread_key_delete,
 147         &_pthread_getspecific,
 148         &_pthread_setspecific,
 149         &_pthread_mutex_init,
 150         &_pthread_mutex_destroy,
 151         &_pthread_mutex_lock,
 152         &_pthread_mutex_trylock,
 153         &_pthread_mutex_unlock
 154 };
 155
 156 #define DUAL_ENTRY(entry)       \
 157         (pthread_func_t)entry, (pthread_func_t)entry
 158
 159 static pthread_func_t jmp_table[][2] = {
 160         {DUAL_ENTRY(_pthread_atfork)},  /* PJT_ATFORK */
 161         {DUAL_ENTRY(_pthread_attr_destroy)},    /* PJT_ATTR_DESTROY */
 162         {DUAL_ENTRY(_pthread_attr_getdetachstate)},     /* PJT_ATTR_GETDETACHSTATE */
 163         {DUAL_ENTRY(_pthread_attr_getguardsize)},       /* PJT_ATTR_GETGUARDSIZE */
 164         {DUAL_ENTRY(_pthread_attr_getinheritsched)},    /* PJT_ATTR_GETINHERITSCHED */
 165         {DUAL_ENTRY(_pthread_attr_getschedparam)},      /* PJT_ATTR_GETSCHEDPARAM */
 166         {DUAL_ENTRY(_pthread_attr_getschedpolicy)},     /* PJT_ATTR_GETSCHEDPOLICY */
 167         {DUAL_ENTRY(_pthread_attr_getscope)},   /* PJT_ATTR_GETSCOPE */
 168         {DUAL_ENTRY(_pthread_attr_getstackaddr)},       /* PJT_ATTR_GETSTACKADDR */
 169         {DUAL_ENTRY(_pthread_attr_getstacksize)},       /* PJT_ATTR_GETSTACKSIZE */
 170         {DUAL_ENTRY(_pthread_attr_init)},       /* PJT_ATTR_INIT */
 171         {DUAL_ENTRY(_pthread_attr_setdetachstate)},     /* PJT_ATTR_SETDETACHSTATE */
 172         {DUAL_ENTRY(_pthread_attr_setguardsize)},       /* PJT_ATTR_SETGUARDSIZE */
 173         {DUAL_ENTRY(_pthread_attr_setinheritsched)},    /* PJT_ATTR_SETINHERITSCHED */
 174         {DUAL_ENTRY(_pthread_attr_setschedparam)},      /* PJT_ATTR_SETSCHEDPARAM */
 175         {DUAL_ENTRY(_pthread_attr_setschedpolicy)},     /* PJT_ATTR_SETSCHEDPOLICY */
 176         {DUAL_ENTRY(_pthread_attr_setscope)},   /* PJT_ATTR_SETSCOPE */
 177         {DUAL_ENTRY(_pthread_attr_setstackaddr)},       /* PJT_ATTR_SETSTACKADDR */
 178         {DUAL_ENTRY(_pthread_attr_setstacksize)},       /* PJT_ATTR_SETSTACKSIZE */
 179         {DUAL_ENTRY(_pthread_cancel)},  /* PJT_CANCEL */
 180         {DUAL_ENTRY(_pthread_cleanup_pop)},     /* PJT_CLEANUP_POP */
 181         {DUAL_ENTRY(_pthread_cleanup_push)},    /* PJT_CLEANUP_PUSH */
 182         {DUAL_ENTRY(_pthread_cond_broadcast)},  /* PJT_COND_BROADCAST */
 183         {DUAL_ENTRY(_pthread_cond_destroy)},    /* PJT_COND_DESTROY */
 184         {DUAL_ENTRY(_pthread_cond_init)},       /* PJT_COND_INIT */
 185         {DUAL_ENTRY(_pthread_cond_signal)},     /* PJT_COND_SIGNAL */
 186         {DUAL_ENTRY(_pthread_cond_timedwait)},  /* PJT_COND_TIMEDWAIT */
 187         {(pthread_func_t)__pthread_cond_wait,
 188          (pthread_func_t)_pthread_cond_wait},   /* PJT_COND_WAIT */
 189         {DUAL_ENTRY(_pthread_detach)},  /* PJT_DETACH */
 190         {DUAL_ENTRY(_pthread_equal)},   /* PJT_EQUAL */
 191         {DUAL_ENTRY(_pthread_exit)},    /* PJT_EXIT */
 192         {DUAL_ENTRY(_pthread_getspecific)},     /* PJT_GETSPECIFIC */
 193         {DUAL_ENTRY(_pthread_join)},    /* PJT_JOIN */
 194         {DUAL_ENTRY(_pthread_key_create)},      /* PJT_KEY_CREATE */
 195         {DUAL_ENTRY(_pthread_key_delete)},      /* PJT_KEY_DELETE*/
 196         {DUAL_ENTRY(_pthread_kill)},    /* PJT_KILL */
 197         {DUAL_ENTRY(_pthread_main_np)},         /* PJT_MAIN_NP */
 198         {DUAL_ENTRY(_pthread_mutexattr_destroy)}, /* PJT_MUTEXATTR_DESTROY */
 199         {DUAL_ENTRY(_pthread_mutexattr_init)},  /* PJT_MUTEXATTR_INIT */
 200         {DUAL_ENTRY(_pthread_mutexattr_settype)}, /* PJT_MUTEXATTR_SETTYPE */
 201         {DUAL_ENTRY(_pthread_mutex_destroy)},   /* PJT_MUTEX_DESTROY */
 202         {DUAL_ENTRY(_pthread_mutex_init)},      /* PJT_MUTEX_INIT */
 203         {(pthread_func_t)__pthread_mutex_lock,
 204          (pthread_func_t)_pthread_mutex_lock},  /* PJT_MUTEX_LOCK */
 205         {(pthread_func_t)__pthread_mutex_trylock,
 206          (pthread_func_t)_pthread_mutex_trylock},/* PJT_MUTEX_TRYLOCK */
 207         {DUAL_ENTRY(_pthread_mutex_unlock)},    /* PJT_MUTEX_UNLOCK */
 208         {DUAL_ENTRY(_pthread_once)},            /* PJT_ONCE */
 209         {DUAL_ENTRY(_pthread_rwlock_destroy)},  /* PJT_RWLOCK_DESTROY */
 210         {DUAL_ENTRY(_pthread_rwlock_init)},     /* PJT_RWLOCK_INIT */
 211         {DUAL_ENTRY(_pthread_rwlock_rdlock)},   /* PJT_RWLOCK_RDLOCK */
 212         {DUAL_ENTRY(_pthread_rwlock_tryrdlock)},/* PJT_RWLOCK_TRYRDLOCK */
 213         {DUAL_ENTRY(_pthread_rwlock_trywrlock)},/* PJT_RWLOCK_TRYWRLOCK */
 214         {DUAL_ENTRY(_pthread_rwlock_unlock)},   /* PJT_RWLOCK_UNLOCK */
 215         {DUAL_ENTRY(_pthread_rwlock_wrlock)},   /* PJT_RWLOCK_WRLOCK */
 216         {DUAL_ENTRY(_pthread_self)},            /* PJT_SELF */
 217         {DUAL_ENTRY(_pthread_setcancelstate)},  /* PJT_SETCANCELSTATE */
 218         {DUAL_ENTRY(_pthread_setcanceltype)},   /* PJT_SETCANCELTYPE */
 219         {DUAL_ENTRY(_pthread_setspecific)},     /* PJT_SETSPECIFIC */
 220         {DUAL_ENTRY(_pthread_sigmask)},         /* PJT_SIGMASK */
 221         {DUAL_ENTRY(_pthread_testcancel)}       /* PJT_TESTCANCEL */
 222 };
 223
 224 int _pthread_guard_default;
 225 int _pthread_page_size;
 226 int _pthread_stack_default;
 227 int _pthread_stack_initial;
 228
 229 /*
 230  * Threaded process initialization
 231  */
 232 void
 233 _thread_init(void)
 234 {
 235         int             fd;
 236         int             flags;
 237         int             i;
 238         size_t          len;
 239         int             mib[2];
 240         int             sched_stack_size;       /* Size of scheduler stack. */
 241 #if !defined(__ia64__)
 242         u_long          stackp;
 243 #endif
 244
 245         struct clockinfo clockinfo;
 246         struct sigaction act;
 247
 248
 249         /* Check if this function has already been called: */
 250         if (_thread_initial)
 251                 /* Only initialise the threaded application once. */
 252                 return;
 253
 254         _pthread_page_size = getpagesize();;
 255         _pthread_guard_default = _pthread_page_size;
 256         sched_stack_size = 4 * _pthread_page_size;
 257         if (sizeof(void *) == 8) {
 258                 _pthread_stack_default = PTHREAD_STACK64_DEFAULT;
 259                 _pthread_stack_initial = PTHREAD_STACK64_INITIAL;
 260         }
 261         else {
 262                 _pthread_stack_default = PTHREAD_STACK32_DEFAULT;
 263                 _pthread_stack_initial = PTHREAD_STACK32_INITIAL;
 264         }
 265
 266         _pthread_attr_default.guardsize_attr = _pthread_guard_default;
 267         _pthread_attr_default.stacksize_attr = _pthread_stack_default;
 268
 269         /*
 270          * Make gcc quiescent about {,libgcc_}references not being
 271          * referenced:
 272          */
 273         if ((references[0] == NULL) || (libgcc_references[0] == NULL))
 274                 PANIC("Failed loading mandatory references in _thread_init");
 275
 276         /*
 277          * Check the size of the jump table to make sure it is preset
 278          * with the correct number of entries.
 279          */
 280         if (sizeof(jmp_table) != (sizeof(pthread_func_t) * PJT_MAX * 2))
 281                 PANIC("Thread jump table not properly initialized");
 282         memcpy(__thr_jtable, jmp_table, sizeof(jmp_table));
 283
 284         /*
 285          * Check for the special case of this process running as
 286          * or in place of init as pid = 1:
 287          */
 288         if (getpid() == 1) {
 289                 /*
 290                  * Setup a new session for this process which is
 291                  * assumed to be running as root.
 292                  */
 293                 if (setsid() == -1)
 294                         PANIC("Can't set session ID");
 295                 if (revoke(_PATH_CONSOLE) != 0)
 296                         PANIC("Can't revoke console");
 297                 if ((fd = __sys_open(_PATH_CONSOLE, O_RDWR)) < 0)
 298                         PANIC("Can't open console");
 299                 if (setlogin("root") == -1)
 300                         PANIC("Can't set login to root");
 301                 if (__sys_ioctl(fd, TIOCSCTTY, (char *) NULL) == -1)
 302                         PANIC("Can't set controlling terminal");
 303                 if (__sys_dup2(fd, 0) == -1 ||
 304                     __sys_dup2(fd, 1) == -1 ||
 305                     __sys_dup2(fd, 2) == -1)
 306                         PANIC("Can't dup2");
 307         }
 308
 309         /* Get the standard I/O flags before messing with them : */
 310         for (i = 0; i < 3; i++) {
 311                 if (((_pthread_stdio_flags[i] =
 312                     __sys_fcntl(i, F_GETFL, NULL)) == -1) &&
 313                     (errno != EBADF))
 314                         PANIC("Cannot get stdio flags");
 315         }
 316
 317         /*
 318          * Create a pipe that is written to by the signal handler to prevent
 319          * signals being missed in calls to _select:
 320          */
 321         if (__sys_pipe(_thread_kern_pipe) != 0) {
 322                 /* Cannot create pipe, so abort: */
 323                 PANIC("Cannot create kernel pipe");
 324         }
 325
 326         /*
 327          * Make sure the pipe does not get in the way of stdio:
 328          */
 329         for (i = 0; i < 2; i++) {
 330                 if (_thread_kern_pipe[i] < 3) {
 331                         fd = __sys_fcntl(_thread_kern_pipe[i], F_DUPFD, 3);
 332                         if (fd == -1)
 333                             PANIC("Cannot create kernel pipe");
 334                         __sys_close(_thread_kern_pipe[i]);
 335                         _thread_kern_pipe[i] = fd;
 336                 }
 337         }
 338         /* Get the flags for the read pipe: */
 339         if ((flags = __sys_fcntl(_thread_kern_pipe[0], F_GETFL, NULL)) == -1) {
 340                 /* Abort this application: */
 341                 PANIC("Cannot get kernel read pipe flags");
 342         }
 343         /* Make the read pipe non-blocking: */
 344         else if (__sys_fcntl(_thread_kern_pipe[0], F_SETFL, flags | O_NONBLOCK) == -1) {
 345                 /* Abort this application: */
 346                 PANIC("Cannot make kernel read pipe non-blocking");
 347         }
 348         /* Get the flags for the write pipe: */
 349         else if ((flags = __sys_fcntl(_thread_kern_pipe[1], F_GETFL, NULL)) == -1) {
 350                 /* Abort this application: */
 351                 PANIC("Cannot get kernel write pipe flags");
 352         }
 353         /* Make the write pipe non-blocking: */
 354         else if (__sys_fcntl(_thread_kern_pipe[1], F_SETFL, flags | O_NONBLOCK) == -1) {
 355                 /* Abort this application: */
 356                 PANIC("Cannot get kernel write pipe flags");
 357         }
 358         /* Allocate and initialize the ready queue: */
 359         else if (_pq_alloc(&_readyq, PTHREAD_MIN_PRIORITY, PTHREAD_LAST_PRIORITY) != 0) {
 360                 /* Abort this application: */
 361                 PANIC("Cannot allocate priority ready queue.");
 362         }
 363         /* Allocate memory for the thread structure of the initial thread: */
 364         else if ((_thread_initial = (pthread_t) malloc(sizeof(struct pthread))) == NULL) {
 365                 /*
 366                  * Insufficient memory to initialise this application, so
 367                  * abort:
 368                  */
 369                 PANIC("Cannot allocate memory for initial thread");
 370         }
 371         /* Allocate memory for the scheduler stack: */
 372         else if ((_thread_kern_sched_stack = malloc(sched_stack_size)) == NULL)
 373                 PANIC("Failed to allocate stack for scheduler");
 374         else {
 375                 /* Zero the global kernel thread structure: */
 376                 memset(&_thread_kern_thread, 0, sizeof(struct pthread));
 377                 _thread_kern_thread.flags = PTHREAD_FLAGS_PRIVATE;
 378                 memset(_thread_initial, 0, sizeof(struct pthread));
 379
 380                 /* Initialize the waiting and work queues: */
 381                 TAILQ_INIT(&_waitingq);
 382                 TAILQ_INIT(&_workq);
 383
 384                 /* Initialize the scheduling switch hook routine: */
 385                 _sched_switch_hook = NULL;
 386
 387                 /* Give this thread default attributes: */
 388                 memcpy((void *) &_thread_initial->attr, &_pthread_attr_default,
 389                     sizeof(struct pthread_attr));
 390
 391                 /* Find the stack top */
 392                 mib[0] = CTL_KERN;
 393                 mib[1] = KERN_USRSTACK;
 394                 len = sizeof (_usrstack);
 395                 if (sysctl(mib, 2, &_usrstack, &len, NULL, 0) == -1)
 396                         _usrstack = (void *)USRSTACK;
 397                 /*
 398                  * Create a red zone below the main stack.  All other stacks are
 399                  * constrained to a maximum size by the paramters passed to
 400                  * mmap(), but this stack is only limited by resource limits, so
 401                  * this stack needs an explicitly mapped red zone to protect the
 402                  * thread stack that is just beyond.
 403                  */
 404                 if (mmap(_usrstack - _pthread_stack_initial -
 405                     _pthread_guard_default, _pthread_guard_default, 0,
 406                     MAP_ANON, -1, 0) == MAP_FAILED)
 407                         PANIC("Cannot allocate red zone for initial thread");
 408
 409                 /* Set the main thread stack pointer. */
 410                 _thread_initial->stack = _usrstack - _pthread_stack_initial;
 411
 412                 /* Set the stack attributes: */
 413                 _thread_initial->attr.stackaddr_attr = _thread_initial->stack;
 414                 _thread_initial->attr.stacksize_attr = _pthread_stack_initial;
 415
 416                 /* Setup the context for the scheduler: */
 417                 _setjmp(_thread_kern_sched_jb);
 418 #if !defined(__ia64__)
 419                 stackp = (long)_thread_kern_sched_stack + sched_stack_size - sizeof(double);
 420 #if defined(__amd64__)
 421                 stackp &= ~0xFUL;
 422 #endif
 423                 SET_STACK_JB(_thread_kern_sched_jb, stackp);
 424 #else
 425                 SET_STACK_JB(_thread_kern_sched_jb, _thread_kern_sched_stack,
 426                     sched_stack_size);
 427 #endif
 428                 SET_RETURN_ADDR_JB(_thread_kern_sched_jb, _thread_kern_scheduler);
 429
 430                 /*
 431                  * Write a magic value to the thread structure
 432                  * to help identify valid ones:
 433                  */
 434                 _thread_initial->magic = PTHREAD_MAGIC;
 435
 436                 /* Set the initial cancel state */
 437                 _thread_initial->cancelflags = PTHREAD_CANCEL_ENABLE |
 438                     PTHREAD_CANCEL_DEFERRED;
 439
 440                 /* Default the priority of the initial thread: */
 441                 _thread_initial->base_priority = PTHREAD_DEFAULT_PRIORITY;
 442                 _thread_initial->active_priority = PTHREAD_DEFAULT_PRIORITY;
 443                 _thread_initial->inherited_priority = 0;
 444
 445                 /* Initialise the state of the initial thread: */
 446                 _thread_initial->state = PS_RUNNING;
 447
 448                 /* Set the name of the thread: */
 449                 _thread_initial->name = strdup("_thread_initial");
 450
 451                 /* Initialize joiner to NULL (no joiner): */
 452                 _thread_initial->joiner = NULL;
 453
 454                 /* Initialize the owned mutex queue and count: */
 455                 TAILQ_INIT(&(_thread_initial->mutexq));
 456                 _thread_initial->priority_mutex_count = 0;
 457
 458                 /* Initialize the global scheduling time: */
 459                 _sched_ticks = 0;
 460                 gettimeofday((struct timeval *) &_sched_tod, NULL);
 461
 462                 /* Initialize last active: */
 463                 _thread_initial->last_active = (long) _sched_ticks;
 464
 465                 /* Initialize the initial context: */
 466                 _thread_initial->curframe = NULL;
 467
 468                 /* Initialise the rest of the fields: */
 469                 _thread_initial->poll_data.nfds = 0;
 470                 _thread_initial->poll_data.fds = NULL;
 471                 _thread_initial->sig_defer_count = 0;
 472                 _thread_initial->yield_on_sig_undefer = 0;
 473                 _thread_initial->specific = NULL;
 474                 _thread_initial->cleanup = NULL;
 475                 _thread_initial->flags = 0;
 476                 _thread_initial->error = 0;
 477                 TAILQ_INIT(&_thread_list);
 478                 TAILQ_INSERT_HEAD(&_thread_list, _thread_initial, tle);
 479                 _set_curthread(_thread_initial);
 480                 TAILQ_INIT(&_atfork_list);
 481                 _pthread_mutex_init(&_atfork_mutex, NULL);
 482
 483                 /* Initialise the global signal action structure: */
 484                 sigfillset(&act.sa_mask);
 485                 act.sa_handler = (void (*) ()) _thread_sig_handler;
 486                 act.sa_flags = SA_SIGINFO | SA_RESTART;
 487
 488                 /* Clear pending signals for the process: */
 489                 sigemptyset(&_process_sigpending);
 490
 491                 /* Clear the signal queue: */
 492                 memset(_thread_sigq, 0, sizeof(_thread_sigq));
 493
 494                 /* Enter a loop to get the existing signal status: */
 495                 for (i = 1; i < NSIG; i++) {
 496                         /* Check for signals which cannot be trapped: */
 497                         if (i == SIGKILL || i == SIGSTOP) {
 498                         }
 499
 500                         /* Get the signal handler details: */
 501                         else if (__sys_sigaction(i, NULL,
 502                             &_thread_sigact[i - 1]) != 0) {
 503                                 /*
 504                                  * Abort this process if signal
 505                                  * initialisation fails:
 506                                  */
 507                                 PANIC("Cannot read signal handler info");
 508                         }
 509
 510                         /* Initialize the SIG_DFL dummy handler count. */
 511                         _thread_dfl_count[i] = 0;
 512                 }
 513
 514                 /*
 515                  * Install the signal handler for the most important
 516                  * signals that the user-thread kernel needs. Actually
 517                  * SIGINFO isn't really needed, but it is nice to have.
 518                  */
 519                 if (__sys_sigaction(_SCHED_SIGNAL, &act, NULL) != 0 ||
 520                     __sys_sigaction(SIGINFO,       &act, NULL) != 0 ||
 521                     __sys_sigaction(SIGCHLD,       &act, NULL) != 0) {
 522                         /*
 523                          * Abort this process if signal initialisation fails:
 524                          */
 525                         PANIC("Cannot initialise signal handler");
 526                 }
 527                 _thread_sigact[_SCHED_SIGNAL - 1].sa_flags = SA_SIGINFO;
 528                 _thread_sigact[SIGINFO - 1].sa_flags = SA_SIGINFO;
 529                 _thread_sigact[SIGCHLD - 1].sa_flags = SA_SIGINFO;
 530
 531                 /* Get the process signal mask: */
 532                 __sys_sigprocmask(SIG_SETMASK, NULL, &_process_sigmask);
 533
 534                 /* Get the kernel clockrate: */
 535                 mib[0] = CTL_KERN;
 536                 mib[1] = KERN_CLOCKRATE;
 537                 len = sizeof (struct clockinfo);
 538                 if (sysctl(mib, 2, &clockinfo, &len, NULL, 0) == 0)
 539                         _clock_res_usec = clockinfo.tick > CLOCK_RES_USEC_MIN ?
 540                             clockinfo.tick : CLOCK_RES_USEC_MIN;
 541
 542                 /* Get the table size: */
 543                 if ((_thread_dtablesize = getdtablesize()) < 0) {
 544                         /*
 545                          * Cannot get the system defined table size, so abort
 546                          * this process.
 547                          */
 548                         PANIC("Cannot get dtablesize");
 549                 }
 550                 /* Allocate memory for the file descriptor table: */
 551                 if ((_thread_fd_table = (struct fd_table_entry **) malloc(sizeof(struct fd_table_entry *) * _thread_dtablesize)) == NULL) {
 552                         /* Avoid accesses to file descriptor table on exit: */
 553                         _thread_dtablesize = 0;
 554
 555                         /*
 556                          * Cannot allocate memory for the file descriptor
 557                          * table, so abort this process.
 558                          */
 559                         PANIC("Cannot allocate memory for file descriptor table");
 560                 }
 561                 /* Allocate memory for the pollfd table: */
 562                 if ((_thread_pfd_table = (struct pollfd *) malloc(sizeof(struct pollfd) * _thread_dtablesize)) == NULL) {
 563                         /*
 564                          * Cannot allocate memory for the file descriptor
 565                          * table, so abort this process.
 566                          */
 567                         PANIC("Cannot allocate memory for pollfd table");
 568                 } else {
 569                         /*
 570                          * Enter a loop to initialise the file descriptor
 571                          * table:
 572                          */
 573                         for (i = 0; i < _thread_dtablesize; i++) {
 574                                 /* Initialise the file descriptor table: */
 575                                 _thread_fd_table[i] = NULL;
 576                         }
 577
 578                         /* Initialize stdio file descriptor table entries: */
 579                         for (i = 0; i < 3; i++) {
 580                                 if ((_thread_fd_table_init(i) != 0) &&
 581                                     (errno != EBADF))
 582                                         PANIC("Cannot initialize stdio file "
 583                                             "descriptor table entry");
 584                         }
 585                 }
 586         }
 587
 588         /* Initialise the garbage collector mutex and condition variable. */
 589         if (_pthread_mutex_init(&_gc_mutex,NULL) != 0 ||
 590             _pthread_cond_init(&_gc_cond,NULL) != 0)
 591                 PANIC("Failed to initialise garbage collector mutex or condvar");
 592 }
 593
 594
 595 /*
 596  * Special start up code for NetBSD/Alpha
 597  */
 598 #if     defined(__NetBSD__) && defined(__alpha__)
 599 int
 600 main(int argc, char *argv[], char *env);
 601
 602 int
 603 _thread_main(int argc, char *argv[], char *env)
 604 {
 605         _thread_init();
 606         return (main(argc, argv, env));
 607 }
 608 #endif