loader/kthread.c

   1 /*
   2  * pthread emulation based on kernel threads
   3  *
   4  * We can't use pthreads directly, so why not let libcs
   5  * that want pthreads use Wine's own threading instead...
   6  *
   7  * Copyright 1999 Ove Kåven
   8  * Copyright 2003 Alexandre Julliard
   9  *
  10  * This library is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU Lesser General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2.1 of the License, or (at your option) any later version.
  14  *
  15  * This library is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public
  21  * License along with this library; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  */
  24
  25 #include "config.h"
  26 #include "wine/port.h"
  27
  28 struct _pthread_cleanup_buffer;
  29
  30 #include <assert.h>
  31 #include <errno.h>
  32 #include <stdlib.h>
  33 #include <signal.h>
  34 #include <setjmp.h>
  35 #ifdef HAVE_UNISTD_H
  36 # include <unistd.h>
  37 #endif
  38 #include <string.h>
  39 #include <sys/types.h>
  40 #ifdef HAVE_SYS_SOCKET_H
  41 # include <sys/socket.h>
  42 #endif
  43 #ifdef HAVE_SYS_MMAN_H
  44 #include <sys/mman.h>
  45 #endif
  46 #ifdef HAVE_NETINET_IN_H
  47 # include <netinet/in.h>
  48 #endif
  49 #ifdef HAVE_ARPA_NAMESER_H
  50 # include <arpa/nameser.h>
  51 #endif
  52 #ifdef HAVE_RESOLV_H
  53 # include <resolv.h>
  54 #endif
  55 #ifdef HAVE_VALGRIND_MEMCHECK_H
  56 #include <valgrind/memcheck.h>
  57 #endif
  58 #ifdef HAVE_SYS_SYSCALL_H
  59 # include <sys/syscall.h>
  60 #endif
  61 #ifdef HAVE_SYS_LWP_H
  62 # include <sys/lwp.h>
  63 #endif
  64 #ifdef HAVE_UCONTEXT_H
  65 # include <ucontext.h>
  66 #endif
  67 #ifdef HAVE_SCHED_H
  68 #include <sched.h>
  69 #endif
  70
  71 #include "wine/library.h"
  72 #include "wine/pthread.h"
  73
  74 #define P_OUTPUT(stuff) write(2,stuff,strlen(stuff))
  75
  76 #define PSTR(str) __ASM_NAME(#str)
  77
  78 static struct wine_pthread_callbacks funcs;
  79
  80 /* thread descriptor */
  81
  82 #define FIRST_KEY 0
  83 #define MAX_KEYS 16 /* libc6 doesn't use that many, but... */
  84 #define MAX_TSD  16
  85
  86 struct pthread_descr_struct
  87 {
  88     char               dummy[2048];
  89     int                thread_errno;
  90     int                thread_h_errno;
  91     int                cancel_state;
  92     int                cancel_type;
  93     struct __res_state res_state;
  94     const void        *key_data[MAX_KEYS];  /* for normal pthread keys */
  95     const void        *tsd_data[MAX_TSD];   /* for libc internal tsd variables */
  96 };
  97
  98 typedef struct pthread_descr_struct *pthread_descr;
  99
 100 static struct pthread_descr_struct initial_descr;
 101
 102 pthread_descr __pthread_thread_self(void)
 103 {
 104     struct pthread_descr_struct *descr;
 105     if (!funcs.ptr_get_thread_data) return &initial_descr;
 106     descr = funcs.ptr_get_thread_data();
 107     if (!descr) return &initial_descr;
 108     return descr;
 109 }
 110
 111 static int (*libc_uselocale)(int set);
 112 static int *libc_multiple_threads;
 113
 114 /***********************************************************************
 115  *           __errno_location/__error/__errno/___errno/__thr_errno
 116  *
 117  * Get the per-thread errno location.
 118  */
 119 int *__errno_location(void)                            /* Linux */
 120 {
 121     pthread_descr descr = __pthread_thread_self();
 122     return &descr->thread_errno;
 123 }
 124 int *__error(void)     { return __errno_location(); }  /* FreeBSD */
 125 int *__errno(void)     { return __errno_location(); }  /* NetBSD */
 126 int *___errno(void)    { return __errno_location(); }  /* Solaris */
 127 int *__thr_errno(void) { return __errno_location(); }  /* UnixWare */
 128
 129 /***********************************************************************
 130  *           __h_errno_location
 131  *
 132  * Get the per-thread h_errno location.
 133  */
 134 int *__h_errno_location(void)
 135 {
 136     pthread_descr descr = __pthread_thread_self();
 137     return &descr->thread_h_errno;
 138 }
 139
 140 struct __res_state *__res_state(void)
 141 {
 142     pthread_descr descr = __pthread_thread_self();
 143     return &descr->res_state;
 144 }
 145
 146 static inline void writejump( const char *symbol, void *dest )
 147 {
 148 #if defined(__GLIBC__) && defined(__i386__)
 149     unsigned char *addr = wine_dlsym( RTLD_NEXT, symbol, NULL, 0 );
 150
 151     if (!addr) return;
 152
 153     /* write a relative jump at the function address */
 154     mprotect((void*)((unsigned int)addr & ~(getpagesize()-1)), 5, PROT_READ|PROT_EXEC|PROT_WRITE);
 155     addr[0] = 0xe9;
 156     *(int *)(addr+1) = (unsigned char *)dest - (addr + 5);
 157     mprotect((void*)((unsigned int)addr & ~(getpagesize()-1)), 5, PROT_READ|PROT_EXEC);
 158
 159 # ifdef HAVE_VALGRIND_MEMCHECK_H
 160     VALGRIND_DISCARD_TRANSLATIONS( addr, 5 );
 161 # endif
 162 #endif  /* __GLIBC__ && __i386__ */
 163 }
 164
 165 /* temporary stacks used on thread exit */
 166 #define TEMP_STACK_SIZE 1024
 167 #define NB_TEMP_STACKS  8
 168 static char temp_stacks[NB_TEMP_STACKS][TEMP_STACK_SIZE];
 169 static int next_temp_stack;  /* next temp stack to use */
 170
 171 /***********************************************************************
 172  *           get_temp_stack
 173  *
 174  * Get a temporary stack address to run the thread exit code on.
 175  */
 176 inline static char *get_temp_stack(void)
 177 {
 178     unsigned int next = interlocked_xchg_add( &next_temp_stack, 1 );
 179     return temp_stacks[next % NB_TEMP_STACKS] + TEMP_STACK_SIZE;
 180 }
 181
 182
 183 /***********************************************************************
 184  *           cleanup_thread
 185  *
 186  * Cleanup the remains of a thread. Runs on a temporary stack.
 187  */
 188 static void cleanup_thread( void *ptr )
 189 {
 190     /* copy the info structure since it is on the stack we will free */
 191     struct wine_pthread_thread_info info = *(struct wine_pthread_thread_info *)ptr;
 192     wine_ldt_free_fs( info.teb_sel );
 193     munmap( info.stack_base, info.stack_size );
 194     munmap( info.teb_base, info.teb_size );
 195 #ifdef HAVE__LWP_CREATE
 196     _lwp_exit();
 197 #endif
 198     _exit( info.exit_status );
 199 }
 200
 201
 202 /***********************************************************************
 203  *           init_process
 204  *
 205  * Initialization for a newly created process.
 206  */
 207 static void init_process( const struct wine_pthread_callbacks *callbacks, size_t size )
 208 {
 209     memcpy( &funcs, callbacks, min( size, sizeof(funcs) ));
 210     funcs.ptr_set_thread_data( &initial_descr );
 211 }
 212
 213
 214 /***********************************************************************
 215  *           init_thread
 216  *
 217  * Initialization for a newly created thread.
 218  */
 219 static void init_thread( struct wine_pthread_thread_info *info )
 220 {
 221     struct pthread_descr_struct *descr;
 222
 223     if (funcs.ptr_set_thread_data)
 224     {
 225         descr = calloc( 1, sizeof(*descr) );
 226         funcs.ptr_set_thread_data( descr );
 227         if (libc_multiple_threads) *libc_multiple_threads = 1;
 228     }
 229     else  /* first thread */
 230     {
 231         descr = &initial_descr;
 232         writejump( "__errno_location", __errno_location );
 233         writejump( "__h_errno_location", __h_errno_location );
 234         writejump( "__res_state", __res_state );
 235     }
 236     descr->cancel_state = PTHREAD_CANCEL_ENABLE;
 237     descr->cancel_type  = PTHREAD_CANCEL_ASYNCHRONOUS;
 238     if (libc_uselocale) libc_uselocale( -1 /*LC_GLOBAL_LOCALE*/ );
 239 }
 240
 241
 242 /***********************************************************************
 243  *           create_thread
 244  */
 245 static int create_thread( struct wine_pthread_thread_info *info )
 246 {
 247     if (!info->stack_base)
 248     {
 249         info->stack_base = wine_anon_mmap( NULL, info->stack_size,
 250                                            PROT_READ | PROT_WRITE | PROT_EXEC, 0 );
 251         if (info->stack_base == (void *)-1) return -1;
 252     }
 253 #ifdef HAVE_CLONE
 254     if (clone( (int (*)(void *))info->entry, (char *)info->stack_base + info->stack_size,
 255                CLONE_VM | CLONE_FS | CLONE_FILES | SIGCHLD, info ) < 0)
 256         return -1;
 257     return 0;
 258 #elif defined(HAVE_RFORK)
 259     {
 260         void **sp = (void **)((char *)info->stack_base + info->stack_size);
 261         *--sp = info;
 262         *--sp = 0;
 263         *--sp = info->entry;
 264         __asm__ __volatile__(
 265             "pushl %2;\n\t"             /* flags */
 266             "pushl $0;\n\t"             /* 0 ? */
 267             "movl %1,%%eax;\n\t"        /* SYS_rfork */
 268             ".byte 0x9a; .long 0; .word 7;\n\t" /* lcall 7:0... FreeBSD syscall */
 269             "cmpl $0, %%edx;\n\t"
 270             "je 1f;\n\t"
 271             "movl %0,%%esp;\n\t"        /* child -> new thread */
 272             "ret;\n"
 273             "1:\n\t"                    /* parent -> caller thread */
 274             "addl $8,%%esp" :
 275             : "r" (sp), "r" (SYS_rfork), "r" (RFPROC | RFMEM | RFTHREAD)
 276             : "eax", "edx");
 277         return 0;
 278     }
 279 #elif defined(HAVE__LWP_CREATE)
 280     {
 281         ucontext_t context;
 282         _lwp_makecontext( &context, (void(*)(void *))info->entry, info,
 283                           NULL, info->stack_base, info->stack_size );
 284         if ( _lwp_create( &context, 0, NULL ) )
 285             return -1;
 286         return 0;
 287     }
 288 #endif
 289     return -1;
 290 }
 291
 292
 293 /***********************************************************************
 294  *           init_current_teb
 295  *
 296  * Set the current TEB for a new thread.
 297  */
 298 static void init_current_teb( struct wine_pthread_thread_info *info )
 299 {
 300 #ifdef __i386__
 301     /* On the i386, the current thread is in the %fs register */
 302     LDT_ENTRY fs_entry;
 303
 304     wine_ldt_set_base( &fs_entry, info->teb_base );
 305     wine_ldt_set_limit( &fs_entry, info->teb_size - 1 );
 306     wine_ldt_set_flags( &fs_entry, WINE_LDT_FLAGS_DATA|WINE_LDT_FLAGS_32BIT );
 307     wine_ldt_init_fs( info->teb_sel, &fs_entry );
 308 #elif defined(HAVE__LWP_CREATE)
 309     /* On non-i386 Solaris, we use the LWP private pointer */
 310     _lwp_setprivate( info->teb_base );
 311 #elif defined(__powerpc__)
 312     /* On PowerPC, the current TEB is in the gpr13 register */
 313 # ifdef __APPLE__
 314     __asm__ __volatile__("mr r13, %0" : : "r" (info->teb_base));
 315 # else
 316     __asm__ __volatile__("mr 2, %0" : : "r" (info->teb_base));
 317 # endif
 318 #elif defined(__ALPHA__)
 319     /* FIXME: On Alpha, the current TEB is not accessible to user-space */
 320 /*    __asm__ __volatile__();*/
 321 #else
 322 # error You must implement init_current_teb for your platform
 323 #endif
 324
 325     /* set pid and tid */
 326     info->pid = getpid();
 327 #ifdef HAVE__LWP_SELF
 328     info->tid = _lwp_self();
 329 #else
 330     info->tid = -1;
 331 #endif
 332 }
 333
 334
 335 /***********************************************************************
 336  *           get_current_teb
 337  */
 338 static void *get_current_teb(void)
 339 {
 340     void *ret;
 341
 342 #ifdef __i386__
 343     __asm__( ".byte 0x64\n\tmovl 0x18,%0" : "=r" (ret) );
 344 #elif defined(HAVE__LWP_CREATE)
 345     ret = _lwp_getprivate();
 346 #elif defined(__powerpc__)
 347 # ifdef __APPLE__
 348     __asm__( "mr %0,r13" : "=r" (ret) );
 349 # else
 350     __asm__( "mr %0,2" : "=r" (ret) );
 351 # endif
 352 #elif defined(__ALPHA__)
 353     /* 0x00ab is the PAL opcode for rdteb */
 354     __asm__( "lda $30,8($30)\n\t"
 355              "stq $0,0($30)\n\t"
 356              "call_pal 0x00ab\n\t"
 357              "mov $0,%0\n\t"
 358              "ldq $0,0($30)\n\t"
 359              "lda $30,-8($30)" : "=r" (ret) );
 360 #else
 361 # error get_current_teb not defined for this architecture
 362 #endif  /* __i386__ */
 363
 364     return ret;
 365 }
 366
 367
 368 /***********************************************************************
 369  *           exit_thread
 370  */
 371 static void DECLSPEC_NORETURN exit_thread( struct wine_pthread_thread_info *info )
 372 {
 373     wine_switch_to_stack( cleanup_thread, info, get_temp_stack() );
 374 }
 375
 376
 377 /***********************************************************************
 378  *           abort_thread
 379  */
 380 static void DECLSPEC_NORETURN abort_thread( long status )
 381 {
 382 #ifdef HAVE__LWP_CREATE
 383     _lwp_exit();
 384 #endif
 385     _exit( status );
 386 }
 387
 388
 389 /***********************************************************************
 390  *           pthread_functions
 391  */
 392 const struct wine_pthread_functions pthread_functions =
 393 {
 394     init_process,
 395     init_thread,
 396     create_thread,
 397     init_current_teb,
 398     get_current_teb,
 399     exit_thread,
 400     abort_thread
 401 };
 402
 403
 404 /* Currently this probably works only for glibc2,
 405  * which checks for the presence of double-underscore-prepended
 406  * pthread primitives, and use them if available.
 407  * If they are not available, the libc defaults to
 408  * non-threadsafe operation (not good). */
 409
 410 #if defined(HAVE_PTHREAD_H) && (defined(__GLIBC__) || defined(__FreeBSD__))
 411
 412 /* adapt as necessary (a construct like this is used in glibc sources) */
 413 #define strong_alias(orig, alias) \
 414  asm(".globl " PSTR(alias) "\n" \
 415      "\t.set " PSTR(alias) "," PSTR(orig))
 416
 417 struct fork_block;
 418
 419 /* pthread functions redirection */
 420
 421 struct pthread_functions
 422 {
 423   pid_t (*ptr_pthread_fork) (struct fork_block *);
 424   int (*ptr_pthread_attr_destroy) (pthread_attr_t *);
 425   int (*ptr___pthread_attr_init_2_0) (pthread_attr_t *);
 426   int (*ptr___pthread_attr_init_2_1) (pthread_attr_t *);
 427   int (*ptr_pthread_attr_getdetachstate) (const pthread_attr_t *, int *);
 428   int (*ptr_pthread_attr_setdetachstate) (pthread_attr_t *, int);
 429   int (*ptr_pthread_attr_getinheritsched) (const pthread_attr_t *, int *);
 430   int (*ptr_pthread_attr_setinheritsched) (pthread_attr_t *, int);
 431   int (*ptr_pthread_attr_getschedparam) (const pthread_attr_t *, struct sched_param *);
 432   int (*ptr_pthread_attr_setschedparam) (pthread_attr_t *, const struct sched_param *);
 433   int (*ptr_pthread_attr_getschedpolicy) (const pthread_attr_t *, int *);
 434   int (*ptr_pthread_attr_setschedpolicy) (pthread_attr_t *, int);
 435   int (*ptr_pthread_attr_getscope) (const pthread_attr_t *, int *);
 436   int (*ptr_pthread_attr_setscope) (pthread_attr_t *, int);
 437   int (*ptr_pthread_condattr_destroy) (pthread_condattr_t *);
 438   int (*ptr_pthread_condattr_init) (pthread_condattr_t *);
 439   int (*ptr___pthread_cond_broadcast) (pthread_cond_t *);
 440   int (*ptr___pthread_cond_destroy) (pthread_cond_t *);
 441   int (*ptr___pthread_cond_init) (pthread_cond_t *, const pthread_condattr_t *);
 442   int (*ptr___pthread_cond_signal) (pthread_cond_t *);
 443   int (*ptr___pthread_cond_wait) (pthread_cond_t *, pthread_mutex_t *);
 444   int (*ptr_pthread_equal) (pthread_t, pthread_t);
 445   void (*ptr___pthread_exit) (void *);
 446   int (*ptr_pthread_getschedparam) (pthread_t, int *, struct sched_param *);
 447   int (*ptr_pthread_setschedparam) (pthread_t, int, const struct sched_param *);
 448   int (*ptr_pthread_mutex_destroy) (pthread_mutex_t *);
 449   int (*ptr_pthread_mutex_init) (pthread_mutex_t *, const pthread_mutexattr_t *);
 450   int (*ptr_pthread_mutex_lock) (pthread_mutex_t *);
 451   int (*ptr_pthread_mutex_trylock) (pthread_mutex_t *);
 452   int (*ptr_pthread_mutex_unlock) (pthread_mutex_t *);
 453   pthread_t (*ptr_pthread_self) (void);
 454   int (*ptr_pthread_setcancelstate) (int, int *);
 455   int (*ptr_pthread_setcanceltype) (int, int *);
 456   void (*ptr_pthread_do_exit) (void *retval, char *currentframe);
 457   void (*ptr_pthread_cleanup_upto) (jmp_buf target, char *targetframe);
 458   pthread_descr (*ptr_pthread_thread_self) (void);
 459   int (*ptr_pthread_internal_tsd_set) (int key, const void *pointer);
 460   void * (*ptr_pthread_internal_tsd_get) (int key);
 461   void ** __attribute__ ((__const__)) (*ptr_pthread_internal_tsd_address) (int key);
 462   int (*ptr_pthread_sigaction) (int sig, const struct sigaction * act, struct sigaction *oact);
 463   int (*ptr_pthread_sigwait) (const sigset_t *set, int *sig);
 464   int (*ptr_pthread_raise) (int sig);
 465   int (*ptr___pthread_cond_timedwait) (pthread_cond_t *, pthread_mutex_t *, const struct timespec *);
 466   void (*ptr__pthread_cleanup_push) (struct _pthread_cleanup_buffer * buffer, void (*routine)(void *), void * arg);
 467   void (*ptr__pthread_cleanup_pop) (struct _pthread_cleanup_buffer * buffer, int execute);
 468 };
 469
 470 static pid_t (*libc_fork)(void);
 471 static int (*libc_sigaction)(int signum, const struct sigaction *act, struct sigaction *oldact);
 472 static int *(*libc_pthread_init)( const struct pthread_functions *funcs );
 473
 474 static struct pthread_functions libc_pthread_functions;
 475
 476 strong_alias(__pthread_thread_self, pthread_thread_self);
 477
 478 /* redefine this to prevent libpthread from overriding our function pointers */
 479 int *__libc_pthread_init( const struct pthread_functions *funcs )
 480 {
 481     return libc_multiple_threads;
 482 }
 483
 484 typedef struct _wine_cleanup {
 485   void (*routine)(void *);
 486   void *arg;
 487 } *wine_cleanup;
 488
 489 int pthread_create(pthread_t* thread, const pthread_attr_t* attr, void*
 490         (*start_routine)(void *), void* arg)
 491 {
 492     assert( funcs.ptr_pthread_create );
 493     return funcs.ptr_pthread_create( thread, attr, start_routine, arg );
 494 }
 495
 496 int pthread_cancel(pthread_t thread)
 497 {
 498     assert( funcs.ptr_pthread_cancel );
 499     return funcs.ptr_pthread_cancel( thread );
 500 }
 501
 502 int pthread_join(pthread_t thread, void **value_ptr)
 503 {
 504     assert( funcs.ptr_pthread_join );
 505     return funcs.ptr_pthread_join( thread, value_ptr );
 506 }
 507
 508 int pthread_detach(pthread_t thread)
 509 {
 510     assert( funcs.ptr_pthread_detach );
 511     return funcs.ptr_pthread_detach( thread );
 512 }
 513
 514 /* FIXME: we have no equivalents in win32 for the policys */
 515 /* so just keep this as a stub */
 516 int pthread_attr_setschedpolicy(pthread_attr_t *attr, int policy)
 517 {
 518   P_OUTPUT("FIXME:pthread_attr_setschedpolicy\n");
 519   return 0;
 520 }
 521
 522 /* FIXME: no win32 equivalent for scope */
 523 int pthread_attr_setscope(pthread_attr_t *attr, int scope)
 524 {
 525   P_OUTPUT("FIXME:pthread_attr_setscope\n");
 526   return 0; /* return success */
 527 }
 528
 529 /* FIXME: no win32 equivalent for schedule param */
 530 int pthread_attr_setschedparam(pthread_attr_t *attr,
 531     const struct sched_param *param)
 532 {
 533   P_OUTPUT("FIXME:pthread_attr_setschedparam\n");
 534   return 0; /* return success */
 535 }
 536
 537 /* FIXME */
 538 int pthread_attr_setstack(pthread_attr_t *attr, void *addr, size_t size)
 539 {
 540   return 0; /* return success */
 541 }
 542
 543 int __pthread_once(pthread_once_t *once_control, void (*init_routine)(void))
 544 {
 545     static pthread_once_t the_once = PTHREAD_ONCE_INIT;
 546     int once_now;
 547
 548     memcpy(&once_now,&the_once,sizeof(once_now));
 549     if (interlocked_cmpxchg((int*)once_control, once_now+1, once_now) == once_now)
 550         (*init_routine)();
 551     return 0;
 552 }
 553 strong_alias(__pthread_once, pthread_once);
 554
 555 void __pthread_kill_other_threads_np(void)
 556 {
 557     /* we don't need to do anything here */
 558 }
 559 strong_alias(__pthread_kill_other_threads_np, pthread_kill_other_threads_np);
 560
 561 /***** atfork *****/
 562
 563 #define MAX_ATFORK 8  /* libc doesn't need that many anyway */
 564
 565 static pthread_mutex_t atfork_mutex = PTHREAD_MUTEX_INITIALIZER;
 566
 567 typedef void (*atfork_handler)();
 568 static atfork_handler atfork_prepare[MAX_ATFORK];
 569 static atfork_handler atfork_parent[MAX_ATFORK];
 570 static atfork_handler atfork_child[MAX_ATFORK];
 571 static int atfork_count;
 572
 573 int __pthread_atfork(void (*prepare)(void), void (*parent)(void), void (*child)(void))
 574 {
 575     pthread_mutex_lock( &atfork_mutex );
 576     assert( atfork_count < MAX_ATFORK );
 577     atfork_prepare[atfork_count] = prepare;
 578     atfork_parent[atfork_count] = parent;
 579     atfork_child[atfork_count] = child;
 580     atfork_count++;
 581     pthread_mutex_unlock( &atfork_mutex );
 582     return 0;
 583 }
 584 strong_alias(__pthread_atfork, pthread_atfork);
 585
 586 pid_t __fork(void)
 587 {
 588     pid_t pid;
 589     int i;
 590
 591     if (!libc_fork)
 592     {
 593         libc_fork = wine_dlsym( RTLD_NEXT, "fork", NULL, 0 );
 594         assert( libc_fork );
 595     }
 596     pthread_mutex_lock( &atfork_mutex );
 597     /* prepare handlers are called in reverse insertion order */
 598     for (i = atfork_count - 1; i >= 0; i--) if (atfork_prepare[i]) atfork_prepare[i]();
 599     if (!(pid = libc_fork()))
 600     {
 601         pthread_mutex_init( &atfork_mutex, NULL );
 602         for (i = 0; i < atfork_count; i++) if (atfork_child[i]) atfork_child[i]();
 603     }
 604     else
 605     {
 606         for (i = 0; i < atfork_count; i++) if (atfork_parent[i]) atfork_parent[i]();
 607         pthread_mutex_unlock( &atfork_mutex );
 608     }
 609     return pid;
 610 }
 611 strong_alias(__fork, fork);
 612
 613 /***** MUTEXES *****/
 614
 615 int __pthread_mutex_init(pthread_mutex_t *mutex, const pthread_mutexattr_t *mutexattr)
 616 {
 617     if (!funcs.ptr_pthread_mutex_init) return 0;
 618     return funcs.ptr_pthread_mutex_init( mutex, mutexattr );
 619 }
 620 strong_alias(__pthread_mutex_init, pthread_mutex_init);
 621
 622 int __pthread_mutex_lock(pthread_mutex_t *mutex)
 623 {
 624     if (!funcs.ptr_pthread_mutex_lock) return 0;
 625     return funcs.ptr_pthread_mutex_lock( mutex );
 626 }
 627 strong_alias(__pthread_mutex_lock, pthread_mutex_lock);
 628
 629 int __pthread_mutex_trylock(pthread_mutex_t *mutex)
 630 {
 631     if (!funcs.ptr_pthread_mutex_trylock) return 0;
 632     return funcs.ptr_pthread_mutex_trylock( mutex );
 633 }
 634 strong_alias(__pthread_mutex_trylock, pthread_mutex_trylock);
 635
 636 int __pthread_mutex_unlock(pthread_mutex_t *mutex)
 637 {
 638     if (!funcs.ptr_pthread_mutex_unlock) return 0;
 639     return funcs.ptr_pthread_mutex_unlock( mutex );
 640 }
 641 strong_alias(__pthread_mutex_unlock, pthread_mutex_unlock);
 642
 643 int __pthread_mutex_destroy(pthread_mutex_t *mutex)
 644 {
 645     if (!funcs.ptr_pthread_mutex_destroy) return 0;
 646     return funcs.ptr_pthread_mutex_destroy( mutex );
 647 }
 648 strong_alias(__pthread_mutex_destroy, pthread_mutex_destroy);
 649
 650
 651 /***** MUTEX ATTRIBUTES *****/
 652 /* just dummies, since critical sections are always recursive */
 653
 654 int __pthread_mutexattr_init(pthread_mutexattr_t *attr)
 655 {
 656   return 0;
 657 }
 658 strong_alias(__pthread_mutexattr_init, pthread_mutexattr_init);
 659
 660 int __pthread_mutexattr_destroy(pthread_mutexattr_t *attr)
 661 {
 662   return 0;
 663 }
 664 strong_alias(__pthread_mutexattr_destroy, pthread_mutexattr_destroy);
 665
 666 int __pthread_mutexattr_setkind_np(pthread_mutexattr_t *attr, int kind)
 667 {
 668   return 0;
 669 }
 670 strong_alias(__pthread_mutexattr_setkind_np, pthread_mutexattr_setkind_np);
 671
 672 int __pthread_mutexattr_getkind_np(pthread_mutexattr_t *attr, int *kind)
 673 {
 674   *kind = PTHREAD_MUTEX_RECURSIVE;
 675   return 0;
 676 }
 677 strong_alias(__pthread_mutexattr_getkind_np, pthread_mutexattr_getkind_np);
 678
 679 int __pthread_mutexattr_settype(pthread_mutexattr_t *attr, int kind)
 680 {
 681   return 0;
 682 }
 683 strong_alias(__pthread_mutexattr_settype, pthread_mutexattr_settype);
 684
 685 int __pthread_mutexattr_gettype(const pthread_mutexattr_t *attr, int *kind)
 686 {
 687   *kind = PTHREAD_MUTEX_RECURSIVE;
 688   return 0;
 689 }
 690 strong_alias(__pthread_mutexattr_gettype, pthread_mutexattr_gettype);
 691
 692
 693 /***** THREAD-SPECIFIC VARIABLES (KEYS) *****/
 694
 695 int __pthread_key_create(pthread_key_t *key, void (*destr_function)(void *))
 696 {
 697     static int keycnt = FIRST_KEY;
 698     *key = interlocked_xchg_add(&keycnt, 1);
 699     return 0;
 700 }
 701 strong_alias(__pthread_key_create, pthread_key_create);
 702
 703 int __pthread_key_delete(pthread_key_t key)
 704 {
 705   return 0;
 706 }
 707 strong_alias(__pthread_key_delete, pthread_key_delete);
 708
 709 int __pthread_setspecific(pthread_key_t key, const void *pointer)
 710 {
 711     pthread_descr descr = __pthread_thread_self();
 712     descr->key_data[key] = pointer;
 713     return 0;
 714 }
 715 strong_alias(__pthread_setspecific, pthread_setspecific);
 716
 717 void *__pthread_getspecific(pthread_key_t key)
 718 {
 719     pthread_descr descr = __pthread_thread_self();
 720     return (void *)descr->key_data[key];
 721 }
 722 strong_alias(__pthread_getspecific, pthread_getspecific);
 723
 724 static int pthread_internal_tsd_set( int key, const void *pointer )
 725 {
 726     pthread_descr descr = __pthread_thread_self();
 727     descr->tsd_data[key] = pointer;
 728     return 0;
 729 }
 730 int (*__libc_internal_tsd_set)(int, const void *) = pthread_internal_tsd_set;
 731
 732 static void *pthread_internal_tsd_get( int key )
 733 {
 734     pthread_descr descr = __pthread_thread_self();
 735     return (void *)descr->tsd_data[key];
 736 }
 737 void* (*__libc_internal_tsd_get)(int) = pthread_internal_tsd_get;
 738
 739 static void ** __attribute__((const)) pthread_internal_tsd_address( int key )
 740 {
 741     pthread_descr descr = __pthread_thread_self();
 742     return (void **)&descr->tsd_data[key];
 743 }
 744 void** (*__libc_internal_tsd_address)(int) = pthread_internal_tsd_address;
 745
 746 /***** "EXCEPTION" FRAMES *****/
 747 /* not implemented right now */
 748
 749 void _pthread_cleanup_push(struct _pthread_cleanup_buffer *buffer, void (*routine)(void *), void *arg)
 750 {
 751   ((wine_cleanup)buffer)->routine = routine;
 752   ((wine_cleanup)buffer)->arg = arg;
 753 }
 754
 755 void _pthread_cleanup_pop(struct _pthread_cleanup_buffer *buffer, int execute)
 756 {
 757   if (execute) (*(((wine_cleanup)buffer)->routine))(((wine_cleanup)buffer)->arg);
 758 }
 759
 760 void _pthread_cleanup_push_defer(struct _pthread_cleanup_buffer *buffer, void (*routine)(void *), void *arg)
 761 {
 762   _pthread_cleanup_push(buffer, routine, arg);
 763 }
 764
 765 void _pthread_cleanup_pop_restore(struct _pthread_cleanup_buffer *buffer, int execute)
 766 {
 767   _pthread_cleanup_pop(buffer, execute);
 768 }
 769
 770 void __pthread_cleanup_upto(jmp_buf target, char *frame)
 771 {
 772     /* FIXME */
 773 }
 774
 775 /***** CONDITIONS *****/
 776
 777 int __pthread_cond_init(pthread_cond_t *cond, const pthread_condattr_t *cond_attr)
 778 {
 779     if (!funcs.ptr_pthread_cond_init) return 0;
 780     return funcs.ptr_pthread_cond_init(cond, cond_attr);
 781 }
 782 strong_alias(__pthread_cond_init, pthread_cond_init);
 783
 784 int __pthread_cond_destroy(pthread_cond_t *cond)
 785 {
 786     if (!funcs.ptr_pthread_cond_destroy) return 0;
 787     return funcs.ptr_pthread_cond_destroy(cond);
 788 }
 789 strong_alias(__pthread_cond_destroy, pthread_cond_destroy);
 790
 791 int __pthread_cond_signal(pthread_cond_t *cond)
 792 {
 793     if (!funcs.ptr_pthread_cond_signal) return 0;
 794     return funcs.ptr_pthread_cond_signal(cond);
 795 }
 796 strong_alias(__pthread_cond_signal, pthread_cond_signal);
 797
 798 int __pthread_cond_broadcast(pthread_cond_t *cond)
 799 {
 800     if (!funcs.ptr_pthread_cond_broadcast) return 0;
 801     return funcs.ptr_pthread_cond_broadcast(cond);
 802 }
 803 strong_alias(__pthread_cond_broadcast, pthread_cond_broadcast);
 804
 805 int __pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
 806 {
 807     if (!funcs.ptr_pthread_cond_wait) return 0;
 808     return funcs.ptr_pthread_cond_wait(cond, mutex);
 809 }
 810 strong_alias(__pthread_cond_wait, pthread_cond_wait);
 811
 812 int __pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex, const struct timespec *abstime)
 813 {
 814     if (!funcs.ptr_pthread_cond_timedwait) return 0;
 815     return funcs.ptr_pthread_cond_timedwait(cond, mutex, abstime);
 816 }
 817 strong_alias(__pthread_cond_timedwait, pthread_cond_timedwait);
 818
 819 /**** CONDITION ATTRIBUTES *****/
 820 /* not implemented right now */
 821
 822 int pthread_condattr_init(pthread_condattr_t *attr)
 823 {
 824   return 0;
 825 }
 826
 827 int pthread_condattr_destroy(pthread_condattr_t *attr)
 828 {
 829   return 0;
 830 }
 831
 832 /***** READ-WRITE LOCKS *****/
 833
 834 int __pthread_rwlock_init(pthread_rwlock_t *rwlock, const pthread_rwlockattr_t *rwlock_attr)
 835 {
 836     assert( funcs.ptr_pthread_rwlock_init );
 837     return funcs.ptr_pthread_rwlock_init( rwlock, rwlock_attr );
 838 }
 839 strong_alias(__pthread_rwlock_init, pthread_rwlock_init);
 840
 841 int __pthread_rwlock_destroy(pthread_rwlock_t *rwlock)
 842 {
 843     assert( funcs.ptr_pthread_rwlock_destroy );
 844     return funcs.ptr_pthread_rwlock_destroy( rwlock );
 845 }
 846 strong_alias(__pthread_rwlock_destroy, pthread_rwlock_destroy);
 847
 848 int __pthread_rwlock_rdlock(pthread_rwlock_t *rwlock)
 849 {
 850     if (!funcs.ptr_pthread_rwlock_rdlock) return 0;
 851     return funcs.ptr_pthread_rwlock_rdlock( rwlock );
 852 }
 853 strong_alias(__pthread_rwlock_rdlock, pthread_rwlock_rdlock);
 854
 855 int __pthread_rwlock_tryrdlock(pthread_rwlock_t *rwlock)
 856 {
 857     assert( funcs.ptr_pthread_rwlock_tryrdlock );
 858     return funcs.ptr_pthread_rwlock_tryrdlock( rwlock );
 859 }
 860 strong_alias(__pthread_rwlock_tryrdlock, pthread_rwlock_tryrdlock);
 861
 862 int __pthread_rwlock_wrlock(pthread_rwlock_t *rwlock)
 863 {
 864     assert( funcs.ptr_pthread_rwlock_wrlock );
 865     return funcs.ptr_pthread_rwlock_wrlock( rwlock );
 866 }
 867 strong_alias(__pthread_rwlock_wrlock, pthread_rwlock_wrlock);
 868
 869 int __pthread_rwlock_trywrlock(pthread_rwlock_t *rwlock)
 870 {
 871     assert( funcs.ptr_pthread_rwlock_trywrlock );
 872     return funcs.ptr_pthread_rwlock_trywrlock( rwlock );
 873 }
 874 strong_alias(__pthread_rwlock_trywrlock, pthread_rwlock_trywrlock);
 875
 876 int __pthread_rwlock_unlock(pthread_rwlock_t *rwlock)
 877 {
 878     if (!funcs.ptr_pthread_rwlock_unlock) return 0;
 879     return funcs.ptr_pthread_rwlock_unlock( rwlock );
 880 }
 881 strong_alias(__pthread_rwlock_unlock, pthread_rwlock_unlock);
 882
 883 /**** READ-WRITE LOCK ATTRIBUTES *****/
 884 /* not implemented right now */
 885
 886 int pthread_rwlockattr_init(pthread_rwlockattr_t *attr)
 887 {
 888   return 0;
 889 }
 890
 891 int __pthread_rwlockattr_destroy(pthread_rwlockattr_t *attr)
 892 {
 893   return 0;
 894 }
 895 strong_alias(__pthread_rwlockattr_destroy, pthread_rwlockattr_destroy);
 896
 897 int pthread_rwlockattr_getkind_np(const pthread_rwlockattr_t *attr, int *pref)
 898 {
 899   *pref = 0;
 900   return 0;
 901 }
 902
 903 int pthread_rwlockattr_setkind_np(pthread_rwlockattr_t *attr, int pref)
 904 {
 905   return 0;
 906 }
 907
 908 /***** MISC *****/
 909
 910 pthread_t pthread_self(void)
 911 {
 912     assert( funcs.ptr_pthread_self );
 913     return funcs.ptr_pthread_self();
 914 }
 915
 916 int pthread_equal(pthread_t thread1, pthread_t thread2)
 917 {
 918     assert( funcs.ptr_pthread_equal );
 919     return funcs.ptr_pthread_equal( thread1, thread2 );
 920 }
 921
 922 void __pthread_do_exit(void *retval, char *currentframe)
 923 {
 924     assert( funcs.ptr_pthread_exit );
 925     return funcs.ptr_pthread_exit( retval, currentframe );
 926 }
 927
 928 void __pthread_exit(void *retval)
 929 {
 930     __pthread_do_exit( retval, NULL );
 931 }
 932 strong_alias(__pthread_exit, pthread_exit);
 933
 934 int pthread_setcancelstate(int state, int *oldstate)
 935 {
 936     pthread_descr descr = __pthread_thread_self();
 937     if (oldstate) *oldstate = descr->cancel_state;
 938     descr->cancel_state = state;
 939     return 0;
 940 }
 941
 942 int pthread_setcanceltype(int type, int *oldtype)
 943 {
 944     pthread_descr descr = __pthread_thread_self();
 945     if (oldtype) *oldtype = descr->cancel_type;
 946     descr->cancel_type = type;
 947     return 0;
 948 }
 949
 950 /***** ANTI-OVERRIDES *****/
 951 /* pthreads tries to override these, point them back to libc */
 952
 953 int sigaction(int signum, const struct sigaction *act, struct sigaction *oldact)
 954 {
 955     if (!libc_sigaction)
 956     {
 957         libc_sigaction = wine_dlsym( RTLD_NEXT, "sigaction", NULL, 0 );
 958         assert( libc_sigaction );
 959     }
 960     return libc_sigaction(signum, act, oldact);
 961 }
 962
 963 void __pthread_initialize(void)
 964 {
 965     static int done;
 966
 967     if (!done)
 968     {
 969         done = 1;
 970         libc_fork = wine_dlsym( RTLD_NEXT, "fork", NULL, 0 );
 971         libc_sigaction = wine_dlsym( RTLD_NEXT, "sigaction", NULL, 0 );
 972         libc_uselocale = wine_dlsym( RTLD_DEFAULT, "uselocale", NULL, 0 );
 973         libc_pthread_init = wine_dlsym( RTLD_NEXT, "__libc_pthread_init", NULL, 0 );
 974         if (libc_pthread_init) libc_multiple_threads = libc_pthread_init( &libc_pthread_functions );
 975     }
 976 }
 977 DECL_GLOBAL_CONSTRUCTOR(init) { __pthread_initialize(); }
 978
 979 static struct pthread_functions libc_pthread_functions =
 980 {
 981     NULL,                          /* ptr_pthread_fork */
 982     NULL, /* FIXME */              /* ptr_pthread_attr_destroy */
 983     NULL, /* FIXME */              /* ptr___pthread_attr_init_2_0 */
 984     NULL, /* FIXME */              /* ptr___pthread_attr_init_2_1 */
 985     NULL, /* FIXME */              /* ptr_pthread_attr_getdetachstate */
 986     NULL, /* FIXME */              /* ptr_pthread_attr_setdetachstate */
 987     NULL, /* FIXME */              /* ptr_pthread_attr_getinheritsched */
 988     NULL, /* FIXME */              /* ptr_pthread_attr_setinheritsched */
 989     NULL, /* FIXME */              /* ptr_pthread_attr_getschedparam */
 990     pthread_attr_setschedparam,    /* ptr_pthread_attr_setschedparam */
 991     NULL, /* FIXME */              /* ptr_pthread_attr_getschedpolicy */
 992     NULL, /* FIXME */              /* ptr_pthread_attr_setschedpolicy */
 993     NULL, /* FIXME */              /* ptr_pthread_attr_getscope */
 994     NULL, /* FIXME */              /* ptr_pthread_attr_setscope */
 995     pthread_condattr_destroy,      /* ptr_pthread_condattr_destroy */
 996     pthread_condattr_init,         /* ptr_pthread_condattr_init */
 997     __pthread_cond_broadcast,      /* ptr___pthread_cond_broadcast */
 998     __pthread_cond_destroy,        /* ptr___pthread_cond_destroy */
 999     __pthread_cond_init,           /* ptr___pthread_cond_init */
1000     __pthread_cond_signal,         /* ptr___pthread_cond_signal */
1001     __pthread_cond_wait,           /* ptr___pthread_cond_wait */
1002     pthread_equal,                 /* ptr_pthread_equal */
1003     __pthread_exit,                /* ptr___pthread_exit */
1004     NULL, /* FIXME */              /* ptr_pthread_getschedparam */
1005     NULL, /* FIXME */              /* ptr_pthread_setschedparam */
1006     __pthread_mutex_destroy,       /* ptr_pthread_mutex_destroy */
1007     __pthread_mutex_init,          /* ptr_pthread_mutex_init */
1008     __pthread_mutex_lock,          /* ptr_pthread_mutex_lock */
1009     __pthread_mutex_trylock,       /* ptr_pthread_mutex_trylock */
1010     __pthread_mutex_unlock,        /* ptr_pthread_mutex_unlock */
1011     pthread_self,                  /* ptr_pthread_self */
1012     pthread_setcancelstate,        /* ptr_pthread_setcancelstate */
1013     pthread_setcanceltype,         /* ptr_pthread_setcanceltype */
1014     __pthread_do_exit,             /* ptr_pthread_do_exit */
1015     __pthread_cleanup_upto,        /* ptr_pthread_cleanup_upto */
1016     __pthread_thread_self,         /* ptr_pthread_thread_self */
1017     pthread_internal_tsd_set,      /* ptr_pthread_internal_tsd_set */
1018     pthread_internal_tsd_get,      /* ptr_pthread_internal_tsd_get */
1019     pthread_internal_tsd_address,  /* ptr_pthread_internal_tsd_address */
1020     NULL,                          /* ptr_pthread_sigaction */
1021     NULL,                          /* ptr_pthread_sigwait */
1022     NULL,                          /* ptr_pthread_raise */
1023     __pthread_cond_timedwait,      /* ptr___pthread_cond_timedwait */
1024     _pthread_cleanup_push,         /* ptr__pthread_cleanup_push */
1025     _pthread_cleanup_pop           /* ptr__pthread_cleanup_pop */
1026 };
1027
1028 #endif /* HAVE_PTHREAD_H && (__GLIBC__ || __FREEBSD__) */