lib/libkse/thread/thr_init.c

   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. Neither the name of the author nor the names of any co-contributors
  15  *    may be used to endorse or promote products derived from this software
  16  *    without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  *
  30  * $FreeBSD$
  31  */
  32
  33 /* Allocate space for global thread variables here: */
  34 #define GLOBAL_PTHREAD_PRIVATE
  35
  36 #include "namespace.h"
  37 #include <sys/param.h>
  38 #include <sys/types.h>
  39 #include <sys/signalvar.h>
  40 #include <machine/reg.h>
  41
  42 #include <sys/ioctl.h>
  43 #include <sys/mount.h>
  44 #include <sys/uio.h>
  45 #include <sys/socket.h>
  46 #include <sys/event.h>
  47 #include <sys/stat.h>
  48 #include <sys/sysctl.h>
  49 #include <sys/time.h>
  50 #include <sys/ttycom.h>
  51 #include <sys/wait.h>
  52 #include <sys/mman.h>
  53 #include <dirent.h>
  54 #include <errno.h>
  55 #include <fcntl.h>
  56 #include <paths.h>
  57 #include <pthread.h>
  58 #include <pthread_np.h>
  59 #include <signal.h>
  60 #include <stdio.h>
  61 #include <stdlib.h>
  62 #include <string.h>
  63 #include <unistd.h>
  64 #include "un-namespace.h"
  65
  66 #include "libc_private.h"
  67 #include "thr_private.h"
  68
  69 LT10_COMPAT_PRIVATE(_libkse_debug);
  70 LT10_COMPAT_PRIVATE(_thread_activated);
  71 LT10_COMPAT_PRIVATE(_thread_active_threads);
  72 LT10_COMPAT_PRIVATE(_thread_list);
  73
  74 int     __pthread_cond_wait(pthread_cond_t *, pthread_mutex_t *);
  75 int     __pthread_mutex_lock(pthread_mutex_t *);
  76 int     __pthread_mutex_trylock(pthread_mutex_t *);
  77 void    _thread_init_hack(void);
  78 extern int _thread_state_running;
  79
  80 static void init_private(void);
  81 static void init_main_thread(struct pthread *thread);
  82
  83 /*
  84  * All weak references used within libc should be in this table.
  85  * This is so that static libraries will work.
  86  */
  87 static void *references[] = {
  88         &_accept,
  89         &_bind,
  90         &_close,
  91         &_connect,
  92         &_dup,
  93         &_dup2,
  94         &_execve,
  95         &_fcntl,
  96         &_flock,
  97         &_flockfile,
  98         &_fstat,
  99         &_fstatfs,
 100         &_fsync,
 101         &_funlockfile,
 102         &_getdirentries,
 103         &_getlogin,
 104         &_getpeername,
 105         &_getsockname,
 106         &_getsockopt,
 107         &_ioctl,
 108         &_kevent,
 109         &_listen,
 110         &_nanosleep,
 111         &_open,
 112         &_pthread_getspecific,
 113         &_pthread_key_create,
 114         &_pthread_key_delete,
 115         &_pthread_mutex_destroy,
 116         &_pthread_mutex_init,
 117         &_pthread_mutex_lock,
 118         &_pthread_mutex_trylock,
 119         &_pthread_mutex_unlock,
 120         &_pthread_mutexattr_init,
 121         &_pthread_mutexattr_destroy,
 122         &_pthread_mutexattr_settype,
 123         &_pthread_once,
 124         &_pthread_setspecific,
 125         &_read,
 126         &_readv,
 127         &_recvfrom,
 128         &_recvmsg,
 129         &_select,
 130         &_sendmsg,
 131         &_sendto,
 132         &_setsockopt,
 133         &_sigaction,
 134         &_sigprocmask,
 135         &_sigsuspend,
 136         &_socket,
 137         &_socketpair,
 138         &_thread_init_hack,
 139         &_wait4,
 140         &_write,
 141         &_writev
 142 };
 143
 144 /*
 145  * These are needed when linking statically.  All references within
 146  * libgcc (and in the future libc) to these routines are weak, but
 147  * if they are not (strongly) referenced by the application or other
 148  * libraries, then the actual functions will not be loaded.
 149  */
 150 static void *libgcc_references[] = {
 151         &_pthread_once,
 152         &_pthread_key_create,
 153         &_pthread_key_delete,
 154         &_pthread_getspecific,
 155         &_pthread_setspecific,
 156         &_pthread_mutex_init,
 157         &_pthread_mutex_destroy,
 158         &_pthread_mutex_lock,
 159         &_pthread_mutex_trylock,
 160         &_pthread_mutex_unlock
 161 };
 162
 163 #define DUAL_ENTRY(entry)       \
 164         (pthread_func_t)entry, (pthread_func_t)entry
 165
 166 static pthread_func_t jmp_table[][2] = {
 167         {DUAL_ENTRY(_pthread_atfork)},  /* PJT_ATFORK */
 168         {DUAL_ENTRY(_pthread_attr_destroy)},    /* PJT_ATTR_DESTROY */
 169         {DUAL_ENTRY(_pthread_attr_getdetachstate)},     /* PJT_ATTR_GETDETACHSTATE */
 170         {DUAL_ENTRY(_pthread_attr_getguardsize)},       /* PJT_ATTR_GETGUARDSIZE */
 171         {DUAL_ENTRY(_pthread_attr_getinheritsched)},    /* PJT_ATTR_GETINHERITSCHED */
 172         {DUAL_ENTRY(_pthread_attr_getschedparam)},      /* PJT_ATTR_GETSCHEDPARAM */
 173         {DUAL_ENTRY(_pthread_attr_getschedpolicy)},     /* PJT_ATTR_GETSCHEDPOLICY */
 174         {DUAL_ENTRY(_pthread_attr_getscope)},   /* PJT_ATTR_GETSCOPE */
 175         {DUAL_ENTRY(_pthread_attr_getstackaddr)},       /* PJT_ATTR_GETSTACKADDR */
 176         {DUAL_ENTRY(_pthread_attr_getstacksize)},       /* PJT_ATTR_GETSTACKSIZE */
 177         {DUAL_ENTRY(_pthread_attr_init)},       /* PJT_ATTR_INIT */
 178         {DUAL_ENTRY(_pthread_attr_setdetachstate)},     /* PJT_ATTR_SETDETACHSTATE */
 179         {DUAL_ENTRY(_pthread_attr_setguardsize)},       /* PJT_ATTR_SETGUARDSIZE */
 180         {DUAL_ENTRY(_pthread_attr_setinheritsched)},    /* PJT_ATTR_SETINHERITSCHED */
 181         {DUAL_ENTRY(_pthread_attr_setschedparam)},      /* PJT_ATTR_SETSCHEDPARAM */
 182         {DUAL_ENTRY(_pthread_attr_setschedpolicy)},     /* PJT_ATTR_SETSCHEDPOLICY */
 183         {DUAL_ENTRY(_pthread_attr_setscope)},   /* PJT_ATTR_SETSCOPE */
 184         {DUAL_ENTRY(_pthread_attr_setstackaddr)},       /* PJT_ATTR_SETSTACKADDR */
 185         {DUAL_ENTRY(_pthread_attr_setstacksize)},       /* PJT_ATTR_SETSTACKSIZE */
 186         {DUAL_ENTRY(_pthread_cancel)},  /* PJT_CANCEL */
 187         {DUAL_ENTRY(_pthread_cleanup_pop)},     /* PJT_CLEANUP_POP */
 188         {DUAL_ENTRY(_pthread_cleanup_push)},    /* PJT_CLEANUP_PUSH */
 189         {DUAL_ENTRY(_pthread_cond_broadcast)},  /* PJT_COND_BROADCAST */
 190         {DUAL_ENTRY(_pthread_cond_destroy)},    /* PJT_COND_DESTROY */
 191         {DUAL_ENTRY(_pthread_cond_init)},       /* PJT_COND_INIT */
 192         {DUAL_ENTRY(_pthread_cond_signal)},     /* PJT_COND_SIGNAL */
 193         {DUAL_ENTRY(_pthread_cond_timedwait)},  /* PJT_COND_TIMEDWAIT */
 194         {(pthread_func_t)__pthread_cond_wait,
 195          (pthread_func_t)_pthread_cond_wait},   /* PJT_COND_WAIT */
 196         {DUAL_ENTRY(_pthread_detach)},  /* PJT_DETACH */
 197         {DUAL_ENTRY(_pthread_equal)},   /* PJT_EQUAL */
 198         {DUAL_ENTRY(_pthread_exit)},    /* PJT_EXIT */
 199         {DUAL_ENTRY(_pthread_getspecific)},     /* PJT_GETSPECIFIC */
 200         {DUAL_ENTRY(_pthread_join)},    /* PJT_JOIN */
 201         {DUAL_ENTRY(_pthread_key_create)},      /* PJT_KEY_CREATE */
 202         {DUAL_ENTRY(_pthread_key_delete)},      /* PJT_KEY_DELETE*/
 203         {DUAL_ENTRY(_pthread_kill)},    /* PJT_KILL */
 204         {DUAL_ENTRY(_pthread_main_np)},         /* PJT_MAIN_NP */
 205         {DUAL_ENTRY(_pthread_mutexattr_destroy)}, /* PJT_MUTEXATTR_DESTROY */
 206         {DUAL_ENTRY(_pthread_mutexattr_init)},  /* PJT_MUTEXATTR_INIT */
 207         {DUAL_ENTRY(_pthread_mutexattr_settype)}, /* PJT_MUTEXATTR_SETTYPE */
 208         {DUAL_ENTRY(_pthread_mutex_destroy)},   /* PJT_MUTEX_DESTROY */
 209         {DUAL_ENTRY(_pthread_mutex_init)},      /* PJT_MUTEX_INIT */
 210         {(pthread_func_t)__pthread_mutex_lock,
 211          (pthread_func_t)_pthread_mutex_lock},  /* PJT_MUTEX_LOCK */
 212         {(pthread_func_t)__pthread_mutex_trylock,
 213          (pthread_func_t)_pthread_mutex_trylock},/* PJT_MUTEX_TRYLOCK */
 214         {DUAL_ENTRY(_pthread_mutex_unlock)},    /* PJT_MUTEX_UNLOCK */
 215         {DUAL_ENTRY(_pthread_once)},            /* PJT_ONCE */
 216         {DUAL_ENTRY(_pthread_rwlock_destroy)},  /* PJT_RWLOCK_DESTROY */
 217         {DUAL_ENTRY(_pthread_rwlock_init)},     /* PJT_RWLOCK_INIT */
 218         {DUAL_ENTRY(_pthread_rwlock_rdlock)},   /* PJT_RWLOCK_RDLOCK */
 219         {DUAL_ENTRY(_pthread_rwlock_tryrdlock)},/* PJT_RWLOCK_TRYRDLOCK */
 220         {DUAL_ENTRY(_pthread_rwlock_trywrlock)},/* PJT_RWLOCK_TRYWRLOCK */
 221         {DUAL_ENTRY(_pthread_rwlock_unlock)},   /* PJT_RWLOCK_UNLOCK */
 222         {DUAL_ENTRY(_pthread_rwlock_wrlock)},   /* PJT_RWLOCK_WRLOCK */
 223         {DUAL_ENTRY(_pthread_self)},            /* PJT_SELF */
 224         {DUAL_ENTRY(_pthread_setcancelstate)},  /* PJT_SETCANCELSTATE */
 225         {DUAL_ENTRY(_pthread_setcanceltype)},   /* PJT_SETCANCELTYPE */
 226         {DUAL_ENTRY(_pthread_setspecific)},     /* PJT_SETSPECIFIC */
 227         {DUAL_ENTRY(_pthread_sigmask)},         /* PJT_SIGMASK */
 228         {DUAL_ENTRY(_pthread_testcancel)}       /* PJT_TESTCANCEL */
 229 };
 230
 231 static int      init_once = 0;
 232
 233 /*
 234  * Threaded process initialization.
 235  *
 236  * This is only called under two conditions:
 237  *
 238  *   1) Some thread routines have detected that the library hasn't yet
 239  *      been initialized (_thr_initial == NULL && curthread == NULL), or
 240  *
 241  *   2) An explicit call to reinitialize after a fork (indicated
 242  *      by curthread != NULL)
 243  */
 244 void
 245 _libpthread_init(struct pthread *curthread)
 246 {
 247         int fd;
 248
 249         /* Check if this function has already been called: */
 250         if ((_thr_initial != NULL) && (curthread == NULL))
 251                 /* Only initialize the threaded application once. */
 252                 return;
 253
 254         /*
 255          * Make gcc quiescent about {,libgcc_}references not being
 256          * referenced:
 257          */
 258         if ((references[0] == NULL) || (libgcc_references[0] == NULL))
 259                 PANIC("Failed loading mandatory references in _thread_init");
 260
 261         /* Pull debug symbols in for static binary */
 262         _thread_state_running = PS_RUNNING;
 263
 264         /*
 265          * Check the size of the jump table to make sure it is preset
 266          * with the correct number of entries.
 267          */
 268         if (sizeof(jmp_table) != (sizeof(pthread_func_t) * PJT_MAX * 2))
 269                 PANIC("Thread jump table not properly initialized");
 270         memcpy(__thr_jtable, jmp_table, sizeof(jmp_table));
 271
 272         /*
 273          * Check for the special case of this process running as
 274          * or in place of init as pid = 1:
 275          */
 276         if ((_thr_pid = getpid()) == 1) {
 277                 /*
 278                  * Setup a new session for this process which is
 279                  * assumed to be running as root.
 280                  */
 281                 if (setsid() == -1)
 282                         PANIC("Can't set session ID");
 283                 if (revoke(_PATH_CONSOLE) != 0)
 284                         PANIC("Can't revoke console");
 285                 if ((fd = __sys_open(_PATH_CONSOLE, O_RDWR)) < 0)
 286                         PANIC("Can't open console");
 287                 if (setlogin("root") == -1)
 288                         PANIC("Can't set login to root");
 289                 if (__sys_ioctl(fd, TIOCSCTTY, (char *) NULL) == -1)
 290                         PANIC("Can't set controlling terminal");
 291         }
 292
 293         /* Initialize pthread private data. */
 294         init_private();
 295         _kse_init();
 296
 297         /* Initialize the initial kse and kseg. */
 298         _kse_initial = _kse_alloc(NULL, _thread_scope_system > 0);
 299         if (_kse_initial == NULL)
 300                 PANIC("Can't allocate initial kse.");
 301         _kse_initial->k_kseg = _kseg_alloc(NULL);
 302         if (_kse_initial->k_kseg == NULL)
 303                 PANIC("Can't allocate initial kseg.");
 304         _kse_initial->k_kseg->kg_flags |= KGF_SINGLE_THREAD;
 305         _kse_initial->k_schedq = &_kse_initial->k_kseg->kg_schedq;
 306
 307         TAILQ_INSERT_TAIL(&_kse_initial->k_kseg->kg_kseq, _kse_initial, k_kgqe);
 308         _kse_initial->k_kseg->kg_ksecount = 1;
 309
 310         /* Set the initial thread. */
 311         if (curthread == NULL) {
 312                 /* Create and initialize the initial thread. */
 313                 curthread = _thr_alloc(NULL);
 314                 if (curthread == NULL)
 315                         PANIC("Can't allocate initial thread");
 316                 _thr_initial = curthread;
 317                 init_main_thread(curthread);
 318         } else {
 319                 /*
 320                  * The initial thread is the current thread.  It is
 321                  * assumed that the current thread is already initialized
 322                  * because it is left over from a fork().
 323                  */
 324                 _thr_initial = curthread;
 325         }
 326         _kse_initial->k_kseg->kg_threadcount = 0;
 327         _thr_initial->kse = _kse_initial;
 328         _thr_initial->kseg = _kse_initial->k_kseg;
 329         _thr_initial->active = 1;
 330
 331         /*
 332          * Add the thread to the thread list and to the KSEG's thread
 333          * queue.
 334          */
 335         THR_LIST_ADD(_thr_initial);
 336         KSEG_THRQ_ADD(_kse_initial->k_kseg, _thr_initial);
 337
 338         /* Setup the KSE/thread specific data for the current KSE/thread. */
 339         _thr_initial->kse->k_curthread = _thr_initial;
 340         _kcb_set(_thr_initial->kse->k_kcb);
 341         _tcb_set(_thr_initial->kse->k_kcb, _thr_initial->tcb);
 342         _thr_initial->kse->k_flags |= KF_INITIALIZED;
 343
 344         _thr_signal_init();
 345         _kse_critical_leave(&_thr_initial->tcb->tcb_tmbx);
 346         /*
 347          * activate threaded mode as soon as possible if we are
 348          * being debugged
 349          */
 350         if (_libkse_debug)
 351                 _kse_setthreaded(1);
 352 }
 353
 354 /*
 355  * This function and pthread_create() do a lot of the same things.
 356  * It'd be nice to consolidate the common stuff in one place.
 357  */
 358 static void
 359 init_main_thread(struct pthread *thread)
 360 {
 361         /* Setup the thread attributes. */
 362         thread->attr = _pthread_attr_default;
 363         thread->attr.flags |= PTHREAD_SCOPE_SYSTEM;
 364         /*
 365          * Set up the thread stack.
 366          *
 367          * Create a red zone below the main stack.  All other stacks
 368          * are constrained to a maximum size by the parameters
 369          * passed to mmap(), but this stack is only limited by
 370          * resource limits, so this stack needs an explicitly mapped
 371          * red zone to protect the thread stack that is just beyond.
 372          */
 373         if (mmap((void *)_usrstack - _thr_stack_initial -
 374             _thr_guard_default, _thr_guard_default, 0, MAP_ANON,
 375             -1, 0) == MAP_FAILED)
 376                 PANIC("Cannot allocate red zone for initial thread");
 377
 378         /*
 379          * Mark the stack as an application supplied stack so that it
 380          * isn't deallocated.
 381          *
 382          * XXX - I'm not sure it would hurt anything to deallocate
 383          *       the main thread stack because deallocation doesn't
 384          *       actually free() it; it just puts it in the free
 385          *       stack queue for later reuse.
 386          */
 387         thread->attr.stackaddr_attr = (void *)_usrstack - _thr_stack_initial;
 388         thread->attr.stacksize_attr = _thr_stack_initial;
 389         thread->attr.guardsize_attr = _thr_guard_default;
 390         thread->attr.flags |= THR_STACK_USER;
 391
 392         /*
 393          * Write a magic value to the thread structure
 394          * to help identify valid ones:
 395          */
 396         thread->magic = THR_MAGIC;
 397
 398         thread->slice_usec = -1;
 399         thread->cancelflags = PTHREAD_CANCEL_ENABLE | PTHREAD_CANCEL_DEFERRED;
 400         thread->name = strdup("initial thread");
 401
 402         /* Initialize the thread for signals: */
 403         SIGEMPTYSET(thread->sigmask);
 404
 405         /*
 406          * Set up the thread mailbox.  The threads saved context
 407          * is also in the mailbox.
 408          */
 409         thread->tcb->tcb_tmbx.tm_udata = thread;
 410         thread->tcb->tcb_tmbx.tm_context.uc_stack.ss_size =
 411             thread->attr.stacksize_attr;
 412         thread->tcb->tcb_tmbx.tm_context.uc_stack.ss_sp =
 413             thread->attr.stackaddr_attr;
 414
 415         /* Default the priority of the initial thread: */
 416         thread->base_priority = THR_DEFAULT_PRIORITY;
 417         thread->active_priority = THR_DEFAULT_PRIORITY;
 418         thread->inherited_priority = 0;
 419
 420         /* Initialize the mutex queue: */
 421         TAILQ_INIT(&thread->mutexq);
 422
 423         /* Initialize hooks in the thread structure: */
 424         thread->specific = NULL;
 425         thread->cleanup = NULL;
 426         thread->flags = 0;
 427         thread->sigbackout = NULL;
 428         thread->continuation = NULL;
 429
 430         thread->state = PS_RUNNING;
 431         thread->uniqueid = 0;
 432 }
 433
 434 static void
 435 init_private(void)
 436 {
 437         struct clockinfo clockinfo;
 438         size_t len;
 439         int mib[2];
 440
 441         /*
 442          * Avoid reinitializing some things if they don't need to be,
 443          * e.g. after a fork().
 444          */
 445         if (init_once == 0) {
 446                 /* Find the stack top */
 447                 mib[0] = CTL_KERN;
 448                 mib[1] = KERN_USRSTACK;
 449                 len = sizeof (_usrstack);
 450                 if (sysctl(mib, 2, &_usrstack, &len, NULL, 0) == -1)
 451                         PANIC("Cannot get kern.usrstack from sysctl");
 452                 /* Get the kernel clockrate: */
 453                 mib[0] = CTL_KERN;
 454                 mib[1] = KERN_CLOCKRATE;
 455                 len = sizeof (struct clockinfo);
 456                 if (sysctl(mib, 2, &clockinfo, &len, NULL, 0) == 0)
 457                         _clock_res_usec = 1000000 / clockinfo.stathz;
 458                 else
 459                         _clock_res_usec = CLOCK_RES_USEC;
 460
 461                 _thr_page_size = getpagesize();
 462                 _thr_guard_default = _thr_page_size;
 463                 if (sizeof(void *) == 8) {
 464                         _thr_stack_default = THR_STACK64_DEFAULT;
 465                         _thr_stack_initial = THR_STACK64_INITIAL;
 466                 }
 467                 else {
 468                         _thr_stack_default = THR_STACK32_DEFAULT;
 469                         _thr_stack_initial = THR_STACK32_INITIAL;
 470                 }
 471                 _pthread_attr_default.guardsize_attr = _thr_guard_default;
 472                 _pthread_attr_default.stacksize_attr = _thr_stack_default;
 473                 TAILQ_INIT(&_thr_atfork_list);
 474                 init_once = 1;  /* Don't do this again. */
 475         } else {
 476                 /*
 477                  * Destroy the locks before creating them.  We don't
 478                  * know what state they are in so it is better to just
 479                  * recreate them.
 480                  */
 481                 _lock_destroy(&_thread_signal_lock);
 482                 _lock_destroy(&_mutex_static_lock);
 483                 _lock_destroy(&_rwlock_static_lock);
 484                 _lock_destroy(&_keytable_lock);
 485         }
 486
 487         /* Initialize everything else. */
 488         TAILQ_INIT(&_thread_list);
 489         TAILQ_INIT(&_thread_gc_list);
 490         _pthread_mutex_init(&_thr_atfork_mutex, NULL);
 491
 492         /*
 493          * Initialize the lock for temporary installation of signal
 494          * handlers (to support sigwait() semantics) and for the
 495          * process signal mask and pending signal sets.
 496          */
 497         if (_lock_init(&_thread_signal_lock, LCK_ADAPTIVE,
 498             _kse_lock_wait, _kse_lock_wakeup, calloc) != 0)
 499                 PANIC("Cannot initialize _thread_signal_lock");
 500         if (_lock_init(&_mutex_static_lock, LCK_ADAPTIVE,
 501             _thr_lock_wait, _thr_lock_wakeup, calloc) != 0)
 502                 PANIC("Cannot initialize mutex static init lock");
 503         if (_lock_init(&_rwlock_static_lock, LCK_ADAPTIVE,
 504             _thr_lock_wait, _thr_lock_wakeup, calloc) != 0)
 505                 PANIC("Cannot initialize rwlock static init lock");
 506         if (_lock_init(&_keytable_lock, LCK_ADAPTIVE,
 507             _thr_lock_wait, _thr_lock_wakeup, calloc) != 0)
 508                 PANIC("Cannot initialize thread specific keytable lock");
 509         _thr_spinlock_init();
 510
 511         /* Clear pending signals and get the process signal mask. */
 512         SIGEMPTYSET(_thr_proc_sigpending);
 513
 514         /* Are we in M:N mode (default) or 1:1 mode? */
 515 #ifdef SYSTEM_SCOPE_ONLY
 516         _thread_scope_system = 1;
 517 #else
 518         if (getenv("LIBPTHREAD_SYSTEM_SCOPE") != NULL)
 519                 _thread_scope_system = 1;
 520         else if (getenv("LIBPTHREAD_PROCESS_SCOPE") != NULL)
 521                 _thread_scope_system = -1;
 522 #endif
 523         if (getenv("LIBPTHREAD_DEBUG") != NULL)
 524                 _thr_debug_flags |= DBG_INFO_DUMP;
 525
 526         /*
 527          * _thread_list_lock and _kse_count are initialized
 528          * by _kse_init()
 529          */
 530 }