thr_init.c revision 174112
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: head/lib/libkse/thread/thr_init.c 174112 2007-11-30 17:20:29Z deischen $ 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 69LT10_COMPAT_PRIVATE(_libkse_debug); 70LT10_COMPAT_PRIVATE(_thread_activated); 71LT10_COMPAT_PRIVATE(_thread_active_threads); 72LT10_COMPAT_PRIVATE(_thread_list); 73 74int __pthread_cond_wait(pthread_cond_t *, pthread_mutex_t *); 75int __pthread_mutex_lock(pthread_mutex_t *); 76int __pthread_mutex_trylock(pthread_mutex_t *); 77void _thread_init_hack(void); 78extern int _thread_state_running; 79 80static void init_private(void); 81static 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 */ 87static 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 */ 150static 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 166static 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 231static 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 */ 244void 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 */ 358static void 359init_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 *)((uintptr_t)_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 *)((uintptr_t)_usrstack - 388 _thr_stack_initial); 389 thread->attr.stacksize_attr = _thr_stack_initial; 390 thread->attr.guardsize_attr = _thr_guard_default; 391 thread->attr.flags |= THR_STACK_USER; 392 393 /* 394 * Write a magic value to the thread structure 395 * to help identify valid ones: 396 */ 397 thread->magic = THR_MAGIC; 398 399 thread->slice_usec = -1; 400 thread->cancelflags = PTHREAD_CANCEL_ENABLE | PTHREAD_CANCEL_DEFERRED; 401 thread->name = strdup("initial thread"); 402 403 /* Initialize the thread for signals: */ 404 SIGEMPTYSET(thread->sigmask); 405 406 /* 407 * Set up the thread mailbox. The threads saved context 408 * is also in the mailbox. 409 */ 410 thread->tcb->tcb_tmbx.tm_udata = thread; 411 thread->tcb->tcb_tmbx.tm_context.uc_stack.ss_size = 412 thread->attr.stacksize_attr; 413 thread->tcb->tcb_tmbx.tm_context.uc_stack.ss_sp = 414 thread->attr.stackaddr_attr; 415 416 /* Default the priority of the initial thread: */ 417 thread->base_priority = THR_DEFAULT_PRIORITY; 418 thread->active_priority = THR_DEFAULT_PRIORITY; 419 thread->inherited_priority = 0; 420 421 /* Initialize the mutex queue: */ 422 TAILQ_INIT(&thread->mutexq); 423 424 /* Initialize hooks in the thread structure: */ 425 thread->specific = NULL; 426 thread->cleanup = NULL; 427 thread->flags = 0; 428 thread->sigbackout = NULL; 429 thread->continuation = NULL; 430 431 thread->state = PS_RUNNING; 432 thread->uniqueid = 0; 433} 434 435static void 436init_private(void) 437{ 438 struct clockinfo clockinfo; 439 size_t len; 440 int mib[2]; 441 442 /* 443 * Avoid reinitializing some things if they don't need to be, 444 * e.g. after a fork(). 445 */ 446 if (init_once == 0) { 447 /* Find the stack top */ 448 mib[0] = CTL_KERN; 449 mib[1] = KERN_USRSTACK; 450 len = sizeof (_usrstack); 451 if (sysctl(mib, 2, &_usrstack, &len, NULL, 0) == -1) 452 PANIC("Cannot get kern.usrstack from sysctl"); 453 /* Get the kernel clockrate: */ 454 mib[0] = CTL_KERN; 455 mib[1] = KERN_CLOCKRATE; 456 len = sizeof (struct clockinfo); 457 if (sysctl(mib, 2, &clockinfo, &len, NULL, 0) == 0) 458 _clock_res_usec = 1000000 / clockinfo.stathz; 459 else 460 _clock_res_usec = CLOCK_RES_USEC; 461 462 _thr_page_size = getpagesize(); 463 _thr_guard_default = _thr_page_size; 464 if (sizeof(void *) == 8) { 465 _thr_stack_default = THR_STACK64_DEFAULT; 466 _thr_stack_initial = THR_STACK64_INITIAL; 467 } 468 else { 469 _thr_stack_default = THR_STACK32_DEFAULT; 470 _thr_stack_initial = THR_STACK32_INITIAL; 471 } 472 _pthread_attr_default.guardsize_attr = _thr_guard_default; 473 _pthread_attr_default.stacksize_attr = _thr_stack_default; 474 TAILQ_INIT(&_thr_atfork_list); 475 init_once = 1; /* Don't do this again. */ 476 } else { 477 /* 478 * Destroy the locks before creating them. We don't 479 * know what state they are in so it is better to just 480 * recreate them. 481 */ 482 _lock_destroy(&_thread_signal_lock); 483 _lock_destroy(&_mutex_static_lock); 484 _lock_destroy(&_rwlock_static_lock); 485 _lock_destroy(&_keytable_lock); 486 } 487 488 /* Initialize everything else. */ 489 TAILQ_INIT(&_thread_list); 490 TAILQ_INIT(&_thread_gc_list); 491 _pthread_mutex_init(&_thr_atfork_mutex, NULL); 492 493 /* 494 * Initialize the lock for temporary installation of signal 495 * handlers (to support sigwait() semantics) and for the 496 * process signal mask and pending signal sets. 497 */ 498 if (_lock_init(&_thread_signal_lock, LCK_ADAPTIVE, 499 _kse_lock_wait, _kse_lock_wakeup, calloc) != 0) 500 PANIC("Cannot initialize _thread_signal_lock"); 501 if (_lock_init(&_mutex_static_lock, LCK_ADAPTIVE, 502 _thr_lock_wait, _thr_lock_wakeup, calloc) != 0) 503 PANIC("Cannot initialize mutex static init lock"); 504 if (_lock_init(&_rwlock_static_lock, LCK_ADAPTIVE, 505 _thr_lock_wait, _thr_lock_wakeup, calloc) != 0) 506 PANIC("Cannot initialize rwlock static init lock"); 507 if (_lock_init(&_keytable_lock, LCK_ADAPTIVE, 508 _thr_lock_wait, _thr_lock_wakeup, calloc) != 0) 509 PANIC("Cannot initialize thread specific keytable lock"); 510 _thr_spinlock_init(); 511 512 /* Clear pending signals and get the process signal mask. */ 513 SIGEMPTYSET(_thr_proc_sigpending); 514 515 /* Are we in M:N mode (default) or 1:1 mode? */ 516#ifdef SYSTEM_SCOPE_ONLY 517 _thread_scope_system = 1; 518#else 519 if (getenv("LIBPTHREAD_SYSTEM_SCOPE") != NULL) 520 _thread_scope_system = 1; 521 else if (getenv("LIBPTHREAD_PROCESS_SCOPE") != NULL) 522 _thread_scope_system = -1; 523#endif 524 if (getenv("LIBPTHREAD_DEBUG") != NULL) 525 _thr_debug_flags |= DBG_INFO_DUMP; 526 527 /* 528 * _thread_list_lock and _kse_count are initialized 529 * by _kse_init() 530 */ 531} 532