gcc/ada/s-osinte-gnu.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS               --
   4 --                                                                          --
   5 --                   S Y S T E M . O S _ I N T E R F A C E                  --
   6 --                                                                          --
   7 --                                  S p e c                                 --
   8 --                                                                          --
   9 --             Copyright (C) 1991-1994, Florida State University            --
  10 --          Copyright (C) 1995-2016, Free Software Foundation, Inc.         --
  11 --                                                                          --
  12 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  13 -- terms of the  GNU General Public License as published  by the Free Soft- --
  14 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  15 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  16 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  17 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  18 --                                                                          --
  19 -- As a special exception under Section 7 of GPL version 3, you are granted --
  20 -- additional permissions described in the GCC Runtime Library Exception,   --
  21 -- version 3.1, as published by the Free Software Foundation.               --
  22 --                                                                          --
  23 -- You should have received a copy of the GNU General Public License and    --
  24 -- a copy of the GCC Runtime Library Exception along with this program;     --
  25 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  26 -- <http://www.gnu.org/licenses/>.                                          --
  27 --                                                                          --
  28 -- GNARL was developed by the GNARL team at Florida State University.       --
  29 -- Extensive contributions were provided by Ada Core Technologies, Inc.     --
  30 --                                                                          --
  31 ------------------------------------------------------------------------------
  32
  33 --  This is the GNU/Hurd (POSIX Threads) version of this package
  34
  35 --  This package encapsulates all direct interfaces to OS services
  36 --  that are needed by children of System.
  37
  38 --  PLEASE DO NOT add any with-clauses to this package or remove the pragma
  39 --  Preelaborate. This package is designed to be a bottom-level (leaf) package
  40
  41 with Interfaces.C;
  42 with Unchecked_Conversion;
  43
  44 package System.OS_Interface is
  45    pragma Preelaborate;
  46
  47    pragma Linker_Options ("-lpthread");
  48    pragma Linker_Options ("-lrt");
  49
  50    subtype int            is Interfaces.C.int;
  51    subtype char           is Interfaces.C.char;
  52    subtype short          is Interfaces.C.short;
  53    subtype long           is Interfaces.C.long;
  54    subtype unsigned       is Interfaces.C.unsigned;
  55    subtype unsigned_short is Interfaces.C.unsigned_short;
  56    subtype unsigned_long  is Interfaces.C.unsigned_long;
  57    subtype unsigned_char  is Interfaces.C.unsigned_char;
  58    subtype plain_char     is Interfaces.C.plain_char;
  59    subtype size_t         is Interfaces.C.size_t;
  60
  61    -----------
  62    -- Errno --
  63    -----------
  64    --  From /usr/include/i386-gnu/bits/errno.h
  65
  66    function errno return int;
  67    pragma Import (C, errno, "__get_errno");
  68
  69    EAGAIN   : constant := 1073741859;
  70    EINTR    : constant := 1073741828;
  71    EINVAL   : constant := 1073741846;
  72    ENOMEM   : constant := 1073741836;
  73    EPERM    : constant := 1073741825;
  74    ETIMEDOUT    : constant := 1073741884;
  75
  76    -------------
  77    -- Signals --
  78    -------------
  79    --  From /usr/include/i386-gnu/bits/signum.h
  80
  81    Max_Interrupt : constant := 32;
  82    type Signal is new int range 0 .. Max_Interrupt;
  83    for Signal'Size use int'Size;
  84
  85    SIGHUP     : constant := 1; --  hangup
  86    SIGINT     : constant := 2; --  interrupt (rubout)
  87    SIGQUIT    : constant := 3; --  quit (ASCD FS)
  88    SIGILL     : constant := 4; --  illegal instruction (not reset)
  89    SIGTRAP    : constant := 5; --  trace trap (not reset)
  90    SIGIOT     : constant := 6; --  IOT instruction
  91    SIGABRT    : constant := 6; --  used by abort, replace SIGIOT in the  future
  92    SIGEMT     : constant := 7; --  EMT instruction
  93    SIGFPE     : constant := 8; --  floating point exception
  94    SIGKILL    : constant := 9; --  kill (cannot be caught or ignored)
  95    SIGBUS     : constant := 10; --  bus error
  96    SIGSEGV    : constant := 11; --  segmentation violation
  97    SIGSYS     : constant := 12; --  bad argument to system call
  98    SIGPIPE    : constant := 13; --  write on a pipe with no one to read it
  99    SIGALRM    : constant := 14; --  alarm clock
 100    SIGTERM    : constant := 15; --  software termination signal from kill
 101    SIGURG     : constant := 16; --  urgent condition on IO channel
 102    SIGSTOP    : constant := 17; --  stop (cannot be caught or ignored)
 103    SIGTSTP    : constant := 18; --  user stop requested from tty
 104    SIGCONT    : constant := 19; --  stopped process has been continued
 105    SIGCLD     : constant := 20; --  alias for SIGCHLD
 106    SIGCHLD    : constant := 20; --  child status change
 107    SIGTTIN    : constant := 21; --  background tty read attempted
 108    SIGTTOU    : constant := 22; --  background tty write attempted
 109    SIGIO      : constant := 23; --  I/O possible (Solaris SIGPOLL alias)
 110    SIGPOLL    : constant := 23; --  I/O possible (same as SIGIO?)
 111    SIGXCPU    : constant := 24; --  CPU time limit exceeded
 112    SIGXFSZ    : constant := 25; --  filesize limit exceeded
 113    SIGVTALRM  : constant := 26; --  virtual timer expired
 114    SIGPROF    : constant := 27; --  profiling timer expired
 115    SIGWINCH   : constant := 28; --  window size change
 116    SIGINFO    : constant := 29; --  information request (NetBSD/FreeBSD)
 117    SIGUSR1    : constant := 30; --  user defined signal 1
 118    SIGUSR2    : constant := 31; --  user defined signal 2
 119    SIGLOST    : constant := 32; --  Resource lost (Sun); server died (GNU)
 120
 121    SIGADAABORT : constant := SIGABRT;
 122    --  Change this if you want to use another signal for task abort.
 123    --  SIGTERM might be a good one.
 124
 125    type Signal_Set is array (Natural range <>) of Signal;
 126
 127    Unmasked    : constant Signal_Set := (
 128       SIGTRAP,
 129       --  To enable debugging on multithreaded applications, mark SIGTRAP to
 130       --  be kept unmasked.
 131
 132       SIGBUS,
 133
 134       SIGTTIN, SIGTTOU, SIGTSTP,
 135       --  Keep these three signals unmasked so that background processes
 136       --  and IO behaves as normal "C" applications
 137
 138       SIGPROF,
 139       --  To avoid confusing the profiler
 140
 141       SIGKILL, SIGSTOP);
 142       --  These two signals actually cannot be masked;
 143       --  POSIX simply won't allow it.
 144
 145    Reserved    : constant Signal_Set :=
 146    --  I am not sure why the following signal is reserved.
 147    --  I guess they are not supported by this version of GNU/Hurd.
 148      (0 .. 0 => SIGVTALRM);
 149
 150    type sigset_t is private;
 151
 152    --  From /usr/include/signal.h /usr/include/i386-gnu/bits/sigset.h
 153    function sigaddset (set : access sigset_t; sig : Signal) return int;
 154    pragma Import (C, sigaddset, "sigaddset");
 155
 156    function sigdelset (set : access sigset_t; sig : Signal) return int;
 157    pragma Import (C, sigdelset, "sigdelset");
 158
 159    function sigfillset (set : access sigset_t) return int;
 160    pragma Import (C, sigfillset, "sigfillset");
 161
 162    function sigismember (set : access sigset_t; sig : Signal) return int;
 163    pragma Import (C, sigismember, "sigismember");
 164
 165    function sigemptyset (set : access sigset_t) return int;
 166    pragma Import (C, sigemptyset, "sigemptyset");
 167
 168    --  sigcontext is architecture dependent, so define it private
 169    type struct_sigcontext is private;
 170
 171    --  From /usr/include/i386-gnu/bits/sigaction.h: Note: arg. order differs
 172    type struct_sigaction is record
 173       sa_handler : System.Address;
 174       sa_mask    : sigset_t;
 175       sa_flags   : int;
 176    end record;
 177    pragma Convention (C, struct_sigaction);
 178
 179    type struct_sigaction_ptr is access all struct_sigaction;
 180
 181    --  From /usr/include/i386-gnu/bits/sigaction.h
 182    SIG_BLOCK   : constant := 1;
 183    SIG_UNBLOCK : constant := 2;
 184    SIG_SETMASK : constant := 3;
 185
 186    --  From /usr/include/i386-gnu/bits/signum.h
 187    SIG_ERR  : constant := 1;
 188    SIG_DFL  : constant := 0;
 189    SIG_IGN  : constant := 1;
 190    SIG_HOLD : constant := 2;
 191
 192    --  From /usr/include/i386-gnu/bits/sigaction.h
 193    SA_SIGINFO : constant := 16#0040#;
 194    SA_ONSTACK : constant := 16#0001#;
 195
 196    function sigaction
 197      (sig  : Signal;
 198       act  : struct_sigaction_ptr;
 199       oact : struct_sigaction_ptr) return int;
 200    pragma Import (C, sigaction, "sigaction");
 201
 202    ----------
 203    -- Time --
 204    ----------
 205
 206    Time_Slice_Supported : constant Boolean := True;
 207    --  Indicates whether time slicing is supported (i.e SCHED_RR is supported)
 208
 209    type timespec is private;
 210
 211    function nanosleep (rqtp, rmtp : access timespec) return int;
 212    pragma Import (C, nanosleep, "nanosleep");
 213
 214    type clockid_t is new int;
 215    CLOCK_REALTIME : constant clockid_t := 0;
 216
 217    --  From: /usr/include/time.h
 218    function clock_gettime
 219      (clock_id : clockid_t;
 220       tp       : access timespec)
 221       return int;
 222    pragma Import (C, clock_gettime, "clock_gettime");
 223
 224    function clock_getres
 225      (clock_id : clockid_t;
 226       res      : access timespec) return int;
 227    pragma Import (C, clock_getres, "clock_getres");
 228
 229    function To_Duration (TS : timespec) return Duration;
 230    pragma Inline (To_Duration);
 231
 232    function To_Timespec (D : Duration) return timespec;
 233    pragma Inline (To_Timespec);
 234
 235    --  From: /usr/include/unistd.h
 236    function sysconf (name : int) return long;
 237    pragma Import (C, sysconf);
 238
 239    --  From /usr/include/i386-gnu/bits/confname.h
 240    SC_CLK_TCK          : constant := 2;
 241    SC_NPROCESSORS_ONLN : constant := 84;
 242
 243    -------------------------
 244    -- Priority Scheduling --
 245    -------------------------
 246    --  From /usr/include/i386-gnu/bits/sched.h
 247
 248    SCHED_OTHER : constant := 0;
 249    SCHED_FIFO  : constant := 1;
 250    SCHED_RR    : constant := 2;
 251
 252    function To_Target_Priority
 253      (Prio : System.Any_Priority) return Interfaces.C.int;
 254    --  Maps System.Any_Priority to a POSIX priority.
 255
 256    -------------
 257    -- Process --
 258    -------------
 259
 260    type pid_t is private;
 261
 262    --  From: /usr/include/signal.h
 263    function kill (pid : pid_t; sig : Signal) return int;
 264    pragma Import (C, kill, "kill");
 265
 266    --  From: /usr/include/unistd.h
 267    function getpid return pid_t;
 268    pragma Import (C, getpid, "getpid");
 269
 270    ---------
 271    -- LWP --
 272    ---------
 273
 274    --  From: /usr/include/pthread/pthread.h
 275    function lwp_self return System.Address;
 276    --  lwp_self does not exist on this thread library, revert to pthread_self
 277    --  which is the closest approximation (with getpid). This function is
 278    --  needed to share 7staprop.adb across POSIX-like targets.
 279    pragma Import (C, lwp_self, "pthread_self");
 280
 281    -------------
 282    -- Threads --
 283    -------------
 284
 285    type Thread_Body is access
 286      function (arg : System.Address) return System.Address;
 287    pragma Convention (C, Thread_Body);
 288
 289    function Thread_Body_Access is new
 290      Unchecked_Conversion (System.Address, Thread_Body);
 291
 292    --  From: /usr/include/bits/pthread.h:typedef int __pthread_t;
 293    --  /usr/include/pthread/pthreadtypes.h:typedef __pthread_t pthread_t;
 294    type pthread_t is new unsigned_long;
 295    subtype Thread_Id        is pthread_t;
 296
 297    function To_pthread_t is new Unchecked_Conversion
 298      (unsigned_long, pthread_t);
 299
 300    type pthread_mutex_t     is limited private;
 301    type pthread_rwlock_t     is limited private;
 302    type pthread_cond_t      is limited private;
 303    type pthread_attr_t      is limited private;
 304    type pthread_mutexattr_t is limited private;
 305    type pthread_rwlockattr_t is limited private;
 306    type pthread_condattr_t  is limited private;
 307    type pthread_key_t       is private;
 308
 309    --  From /usr/include/pthread/pthreadtypes.h
 310    PTHREAD_CREATE_DETACHED : constant := 1;
 311    PTHREAD_CREATE_JOINABLE : constant := 0;
 312
 313    PTHREAD_SCOPE_PROCESS : constant := 1;
 314    PTHREAD_SCOPE_SYSTEM  : constant := 0;
 315
 316    -----------
 317    -- Stack --
 318    -----------
 319
 320    --  From: /usr/include/i386-gnu/bits/sigstack.h
 321    type stack_t is record
 322       ss_sp    : System.Address;
 323       ss_size  : size_t;
 324       ss_flags : int;
 325    end record;
 326    pragma Convention (C, stack_t);
 327
 328    function sigaltstack
 329      (ss  : not null access stack_t;
 330       oss : access stack_t) return int;
 331    pragma Import (C, sigaltstack, "sigaltstack");
 332
 333    Alternate_Stack : aliased System.Address;
 334    --  This is a dummy definition, never used (Alternate_Stack_Size is null)
 335
 336    Alternate_Stack_Size : constant := 0;
 337    --  No alternate signal stack is used on this platform
 338
 339    Stack_Base_Available : constant Boolean := False;
 340    --  Indicates whether the stack base is available on this target
 341
 342    function Get_Stack_Base (thread : pthread_t) return Address;
 343    pragma Inline (Get_Stack_Base);
 344    --  returns the stack base of the specified thread. Only call this function
 345    --  when Stack_Base_Available is True.
 346
 347    --  From: /usr/include/i386-gnu/bits/shm.h
 348    function Get_Page_Size return int;
 349    pragma Import (C, Get_Page_Size, "getpagesize");
 350    --  Returns the size of a page
 351
 352    --  From /usr/include/i386-gnu/bits/mman.h
 353    PROT_NONE  : constant := 0;
 354    PROT_READ  : constant := 4;
 355    PROT_WRITE : constant := 2;
 356    PROT_EXEC  : constant := 1;
 357    PROT_ALL   : constant := PROT_READ + PROT_WRITE + PROT_EXEC;
 358    PROT_ON    : constant := PROT_NONE;
 359    PROT_OFF   : constant := PROT_ALL;
 360
 361    --  From /usr/include/i386-gnu/bits/mman.h
 362    function mprotect (addr : Address; len : size_t; prot : int) return int;
 363    pragma Import (C, mprotect);
 364
 365    ---------------------------------------
 366    -- Nonstandard Thread Initialization --
 367    ---------------------------------------
 368
 369    procedure pthread_init;
 370    pragma Inline (pthread_init);
 371    --  This is a dummy procedure to share some GNULLI files
 372
 373    -------------------------
 374    -- POSIX.1c  Section 3 --
 375    -------------------------
 376
 377    --  From: /usr/include/signal.h:
 378    --  sigwait (__const sigset_t *__restrict __set, int *__restrict __sig)
 379    function sigwait (set : access sigset_t; sig : access Signal) return int;
 380    pragma Import (C, sigwait, "sigwait");
 381
 382    --  From: /usr/include/pthread/pthread.h:
 383    --  extern int pthread_kill (pthread_t thread, int signo);
 384    function pthread_kill (thread : pthread_t; sig : Signal) return int;
 385    pragma Import (C, pthread_kill, "pthread_kill");
 386
 387    --  From: /usr/include/i386-gnu/bits/sigthread.h
 388    --  extern int pthread_sigmask (int __how, __const __sigset_t *__newmask,
 389    --  __sigset_t *__oldmask) __THROW;
 390    function pthread_sigmask
 391      (how  : int;
 392       set  : access sigset_t;
 393       oset : access sigset_t) return int;
 394    pragma Import (C, pthread_sigmask, "pthread_sigmask");
 395
 396    --------------------------
 397    -- POSIX.1c  Section 11 --
 398    --------------------------
 399
 400    --  From: /usr/include/pthread/pthread.h and
 401    --  /usr/include/pthread/pthreadtypes.h
 402    function pthread_mutexattr_init
 403      (attr : access pthread_mutexattr_t) return int;
 404    pragma Import (C, pthread_mutexattr_init, "pthread_mutexattr_init");
 405
 406    function pthread_mutexattr_destroy
 407      (attr : access pthread_mutexattr_t) return int;
 408    pragma Import (C, pthread_mutexattr_destroy, "pthread_mutexattr_destroy");
 409
 410    function pthread_mutex_init
 411      (mutex : access pthread_mutex_t;
 412       attr  : access pthread_mutexattr_t) return int;
 413    pragma Import (C, pthread_mutex_init, "pthread_mutex_init");
 414
 415    function pthread_mutex_destroy (mutex : access pthread_mutex_t) return int;
 416    pragma Import (C, pthread_mutex_destroy, "pthread_mutex_destroy");
 417
 418    function pthread_mutex_lock (mutex : access pthread_mutex_t) return int;
 419    pragma Import (C, pthread_mutex_lock, "pthread_mutex_lock");
 420
 421    function pthread_mutex_unlock (mutex : access pthread_mutex_t) return int;
 422    pragma Import (C, pthread_mutex_unlock, "pthread_mutex_unlock");
 423
 424    function pthread_rwlockattr_init
 425      (attr : access pthread_rwlockattr_t) return int;
 426    pragma Import (C, pthread_rwlockattr_init, "pthread_rwlockattr_init");
 427
 428    function pthread_rwlockattr_destroy
 429      (attr : access pthread_rwlockattr_t) return int;
 430    pragma Import (C, pthread_rwlockattr_destroy, "pthread_rwlockattr_destroy");
 431    PTHREAD_RWLOCK_PREFER_READER_NP              : constant := 0;
 432    PTHREAD_RWLOCK_PREFER_WRITER_NP              : constant := 1;
 433    PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP : constant := 2;
 434
 435    function pthread_rwlockattr_setkind_np
 436      (attr : access pthread_rwlockattr_t;
 437       pref : int) return int;
 438    pragma Import
 439      (C, pthread_rwlockattr_setkind_np, "pthread_rwlockattr_setkind_np");
 440
 441    function pthread_rwlock_init
 442      (mutex : access pthread_rwlock_t;
 443       attr  : access pthread_rwlockattr_t) return int;
 444    pragma Import (C, pthread_rwlock_init, "pthread_rwlock_init");
 445
 446    function pthread_rwlock_destroy
 447      (mutex : access pthread_rwlock_t) return int;
 448    pragma Import (C, pthread_rwlock_destroy, "pthread_rwlock_destroy");
 449
 450    function pthread_rwlock_rdlock (mutex : access pthread_rwlock_t) return int;
 451    pragma Import (C, pthread_rwlock_rdlock, "pthread_rwlock_rdlock");
 452
 453    function pthread_rwlock_wrlock (mutex : access pthread_rwlock_t) return int;
 454    pragma Import (C, pthread_rwlock_wrlock, "pthread_rwlock_wrlock");
 455
 456    function pthread_rwlock_unlock (mutex : access pthread_rwlock_t) return int;
 457    pragma Import (C, pthread_rwlock_unlock, "pthread_rwlock_unlock");
 458
 459    function pthread_condattr_init
 460      (attr : access pthread_condattr_t) return int;
 461    pragma Import (C, pthread_condattr_init, "pthread_condattr_init");
 462
 463    function pthread_condattr_destroy
 464      (attr : access pthread_condattr_t) return int;
 465    pragma Import (C, pthread_condattr_destroy, "pthread_condattr_destroy");
 466
 467    function pthread_cond_init
 468      (cond : access pthread_cond_t;
 469       attr : access pthread_condattr_t) return int;
 470    pragma Import (C, pthread_cond_init, "pthread_cond_init");
 471
 472    function pthread_cond_destroy (cond : access pthread_cond_t) return int;
 473    pragma Import (C, pthread_cond_destroy, "pthread_cond_destroy");
 474
 475    function pthread_cond_signal (cond : access pthread_cond_t) return int;
 476    pragma Import (C, pthread_cond_signal, "pthread_cond_signal");
 477
 478    function pthread_cond_wait
 479      (cond  : access pthread_cond_t;
 480       mutex : access pthread_mutex_t) return int;
 481    pragma Import (C, pthread_cond_wait, "pthread_cond_wait");
 482
 483    function pthread_cond_timedwait
 484      (cond    : access pthread_cond_t;
 485       mutex   : access pthread_mutex_t;
 486       abstime : access timespec) return int;
 487    pragma Import (C, pthread_cond_timedwait, "pthread_cond_timedwait");
 488
 489    Relative_Timed_Wait : constant Boolean := False;
 490    --  pthread_cond_timedwait requires an absolute delay time
 491
 492    --------------------------
 493    -- POSIX.1c  Section 13 --
 494    --------------------------
 495    --  From /usr/include/pthread/pthreadtypes.h
 496
 497    PTHREAD_PRIO_NONE    : constant := 0;
 498    PTHREAD_PRIO_PROTECT : constant := 2;
 499    PTHREAD_PRIO_INHERIT : constant := 1;
 500
 501    --  GNU/Hurd does not support Thread Priority Protection or Thread
 502    --  Priority Inheritance and lacks some pthread_mutexattr_* functions.
 503    --  Replace them with dummy versions.
 504    --  From: /usr/include/pthread/pthread.h
 505
 506    function pthread_mutexattr_setprotocol
 507      (attr     : access pthread_mutexattr_t;
 508       protocol : int) return int;
 509    pragma Import (C, pthread_mutexattr_setprotocol,
 510      "pthread_mutexattr_setprotocol");
 511
 512    function pthread_mutexattr_getprotocol
 513      (attr     : access pthread_mutexattr_t;
 514       protocol : access int) return int;
 515    pragma Import (C, pthread_mutexattr_getprotocol,
 516      "pthread_mutexattr_getprotocol");
 517
 518    function pthread_mutexattr_setprioceiling
 519      (attr     : access pthread_mutexattr_t;
 520       prioceiling : int) return int;
 521
 522    function pthread_mutexattr_getprioceiling
 523      (attr     : access pthread_mutexattr_t;
 524       prioceiling : access int) return int;
 525
 526    type struct_sched_param is record
 527       sched_priority : int;  --  scheduling priority
 528    end record;
 529    pragma Convention (C, struct_sched_param);
 530
 531    function pthread_setschedparam
 532      (thread : pthread_t;
 533       policy : int;
 534       param  : access struct_sched_param) return int;
 535
 536    function pthread_attr_setscope
 537      (attr            : access pthread_attr_t;
 538       contentionscope : int) return int;
 539    pragma Import (C, pthread_attr_setscope, "pthread_attr_setscope");
 540
 541    function pthread_attr_getscope
 542      (attr            : access pthread_attr_t;
 543       contentionscope : access int) return int;
 544    pragma Import (C, pthread_attr_getscope, "pthread_attr_getscope");
 545
 546    function pthread_attr_setinheritsched
 547      (attr            : access pthread_attr_t;
 548       inheritsched : int) return int;
 549    pragma Import (C, pthread_attr_setinheritsched,
 550      "pthread_attr_setinheritsched");
 551
 552    function pthread_attr_getinheritsched
 553      (attr         : access pthread_attr_t;
 554       inheritsched : access int) return int;
 555    pragma Import (C, pthread_attr_getinheritsched,
 556      "pthread_attr_getinheritsched");
 557
 558    function pthread_attr_setschedpolicy
 559      (attr   : access pthread_attr_t;
 560       policy : int) return int;
 561    pragma Import (C, pthread_attr_setschedpolicy, "pthread_setschedpolicy");
 562
 563    function sched_yield return int;
 564    pragma Import (C, sched_yield, "sched_yield");
 565
 566    ---------------------------
 567    -- P1003.1c - Section 16 --
 568    ---------------------------
 569
 570    function pthread_attr_init
 571      (attributes : access pthread_attr_t) return int;
 572    pragma Import (C, pthread_attr_init, "pthread_attr_init");
 573
 574    function pthread_attr_destroy
 575      (attributes : access pthread_attr_t) return int;
 576    pragma Import (C, pthread_attr_destroy, "pthread_attr_destroy");
 577
 578    function pthread_attr_setdetachstate
 579      (attr        : access pthread_attr_t;
 580       detachstate : int) return int;
 581    pragma Import
 582      (C, pthread_attr_setdetachstate, "pthread_attr_setdetachstate");
 583
 584    function pthread_attr_setstacksize
 585      (attr      : access pthread_attr_t;
 586       stacksize : size_t) return int;
 587    pragma Import (C, pthread_attr_setstacksize, "pthread_attr_setstacksize");
 588
 589    --  From: /usr/include/pthread/pthread.h
 590    function pthread_create
 591      (thread        : access pthread_t;
 592       attributes    : access pthread_attr_t;
 593       start_routine : Thread_Body;
 594       arg           : System.Address) return int;
 595    pragma Import (C, pthread_create, "pthread_create");
 596
 597    procedure pthread_exit (status : System.Address);
 598    pragma Import (C, pthread_exit, "pthread_exit");
 599
 600    function pthread_self return pthread_t;
 601    pragma Import (C, pthread_self, "pthread_self");
 602
 603    --------------------------
 604    -- POSIX.1c  Section 17 --
 605    --------------------------
 606
 607    function pthread_setspecific
 608      (key   : pthread_key_t;
 609       value : System.Address) return int;
 610    pragma Import (C, pthread_setspecific, "pthread_setspecific");
 611
 612    function pthread_getspecific (key : pthread_key_t) return System.Address;
 613    pragma Import (C, pthread_getspecific, "pthread_getspecific");
 614
 615    type destructor_pointer is access procedure (arg : System.Address);
 616    pragma Convention (C, destructor_pointer);
 617
 618    function pthread_key_create
 619      (key        : access pthread_key_t;
 620       destructor : destructor_pointer) return int;
 621    pragma Import (C, pthread_key_create, "pthread_key_create");
 622
 623    --  From /usr/include/i386-gnu/bits/sched.h
 624    CPU_SETSIZE : constant := 1_024;
 625
 626    type bit_field is array (1 .. CPU_SETSIZE) of Boolean;
 627    for bit_field'Size use CPU_SETSIZE;
 628    pragma Pack (bit_field);
 629    pragma Convention (C, bit_field);
 630
 631    type cpu_set_t is record
 632       bits : bit_field;
 633    end record;
 634    pragma Convention (C, cpu_set_t);
 635
 636 private
 637
 638    type sigset_t is array (1 .. 4) of unsigned;
 639
 640    --  In GNU/Hurd the component sa_handler turns out to
 641    --  be one a union type, and the selector is a macro:
 642    --  #define sa_handler __sigaction_handler.sa_handler
 643    --  #define sa_sigaction __sigaction_handler.sa_sigaction
 644
 645    --  Should we add a signal_context type here ?
 646    --  How could it be done independent of the CPU architecture ?
 647    --  sigcontext type is opaque, so it is architecturally neutral.
 648    --  It is always passed as an access type, so define it as an empty record
 649    --  since the contents are not used anywhere.
 650    type struct_sigcontext is null record;
 651    pragma Convention (C, struct_sigcontext);
 652
 653    type pid_t is new int;
 654
 655    type time_t is new long;
 656
 657    type timespec is record
 658       tv_sec  : time_t;
 659       tv_nsec : long;
 660    end record;
 661    pragma Convention (C, timespec);
 662
 663    --  From: /usr/include/pthread/pthreadtypes.h:
 664    --  typedef struct __pthread_attr pthread_attr_t;
 665    --  /usr/include/i386-gnu/bits/thread-attr.h: struct __pthread_attr...
 666    --  /usr/include/pthread/pthreadtypes.h: enum __pthread_contentionscope
 667    --   enum __pthread_detachstate detachstate;
 668    --   enum __pthread_inheritsched inheritsched;
 669    --   enum __pthread_contentionscope contentionscope;
 670    --   Not used: schedpolicy   : int;
 671    type pthread_attr_t is record
 672       schedparam    : struct_sched_param;
 673       stackaddr     : System.Address;
 674       stacksize     : size_t;
 675       guardsize     : size_t;
 676       detachstate   : int;
 677       inheritsched  : int;
 678       contentionscope : int;
 679       schedpolicy   : int;
 680    end record;
 681    pragma Convention (C, pthread_attr_t);
 682
 683    --  From: /usr/include/pthread/pthreadtypes.h:
 684    --  typedef struct __pthread_condattr pthread_condattr_t;
 685    --  From: /usr/include/i386-gnu/bits/condition-attr.h:
 686    --  struct __pthread_condattr {
 687    --    enum __pthread_process_shared pshared;
 688    --    __Clockid_T Clock;}
 689    --  From: /usr/include/pthread/pthreadtypes.h:
 690    --  enum __pthread_process_shared
 691    type pthread_condattr_t is record
 692       pshared : int;
 693       clock   : clockid_t;
 694    end record;
 695    pragma Convention (C, pthread_condattr_t);
 696
 697    --  From: /usr/include/pthread/pthreadtypes.h:
 698    --  typedef struct __pthread_mutexattr pthread_mutexattr_t; and
 699    --  /usr/include/i386-gnu/bits/mutex-attr.h
 700    --  struct __pthread_mutexattr {
 701    --  int prioceiling;
 702    --  enum __pthread_mutex_protocol protocol;
 703    --  enum __pthread_process_shared pshared;
 704    --  enum __pthread_mutex_type mutex_type;};
 705    type pthread_mutexattr_t is record
 706       prioceiling : int;
 707       protocol    : int;
 708       pshared     : int;
 709       mutex_type  : int;
 710    end record;
 711    pragma Convention (C, pthread_mutexattr_t);
 712
 713    --  From: /usr/include/pthread/pthreadtypes.h
 714    --  typedef struct __pthread_mutex pthread_mutex_t; and
 715    --  /usr/include/i386-gnu/bits/mutex.h:
 716    --  struct __pthread_mutex {
 717    --  __pthread_spinlock_t __held;
 718    --  __pthread_spinlock_t __lock;
 719    --  /* in cthreads, mutex_init does not initialized the third
 720    --    pointer, as such, we cannot rely on its value for anything.  */
 721    --    char *cthreadscompat1;
 722    --  struct __pthread *__queue;
 723    --  struct __pthread_mutexattr *attr;
 724    --  void *data;
 725    --  /*  up to this point, we are completely compatible with cthreads
 726    --    and what libc expects.  */
 727    --    void *owner;
 728    --  unsigned locks;
 729    --  /* if null then the default attributes apply.  */
 730    --    };
 731
 732    type pthread_mutex_t is record
 733       held          : int;
 734       lock          : int;
 735       cthreadcompat : System.Address;
 736       queue         : System.Address;
 737       attr          : System.Address;
 738       data          : System.Address;
 739       owner         : System.Address;
 740       locks         : unsigned;
 741    end record;
 742    pragma Convention (C, pthread_mutex_t);
 743    --  pointer needed?
 744    --  type pthread_mutex_t_ptr is access pthread_mutex_t;
 745
 746    --  From: /usr/include/pthread/pthreadtypes.h:
 747    --  typedef struct __pthread_cond pthread_cond_t;
 748    --  typedef struct __pthread_condattr pthread_condattr_t;
 749    --  /usr/include/i386-gnu/bits/condition.h:struct __pthread_cond{}
 750    --  pthread_condattr_t: see above!
 751    --  /usr/include/i386-gnu/bits/condition.h:
 752    --  struct __pthread_condimpl *__impl;
 753
 754    type pthread_cond_t is record
 755       lock       : int;
 756       queue      : System.Address;
 757       condattr   : System.Address;
 758       impl       : System.Address;
 759       data       : System.Address;
 760    end record;
 761    pragma Convention (C, pthread_cond_t);
 762
 763    --  From: /usr/include/pthread/pthreadtypes.h:
 764    --  typedef __pthread_key pthread_key_t; and
 765    --  /usr/include/i386-gnu/bits/thread-specific.h:
 766    --  typedef int __pthread_key;
 767
 768    type pthread_key_t is new int;
 769
 770    --  From: /usr/include/i386-gnu/bits/rwlock-attr.h:
 771    --  struct __pthread_rwlockattr {
 772    --  enum __pthread_process_shared pshared; };
 773
 774    type pthread_rwlockattr_t is record
 775       pshared : int;
 776    end record;
 777    pragma Convention (C, pthread_rwlockattr_t);
 778
 779    --  From: /usr/include/i386-gnu/bits/rwlock.h:
 780    --  struct __pthread_rwlock {
 781    --  __pthread_spinlock_t __held;
 782    --  __pthread_spinlock_t __lock;
 783    --  int readers;
 784    --  struct __pthread *readerqueue;
 785    --  struct __pthread *writerqueue;
 786    --  struct __pthread_rwlockattr *__attr;
 787    --  void *__data; };
 788
 789    type pthread_rwlock_t is record
 790       held        : int;
 791       lock        : int;
 792       readers     : int;
 793       readerqueue : System.Address;
 794       writerqueue : System.Address;
 795       attr        : pthread_rwlockattr_t;
 796       data        : int;
 797    end record;
 798    pragma Convention (C, pthread_rwlock_t);
 799
 800 end System.OS_Interface;