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