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 __getpagesize or getpagesize??
 348    function Get_Page_Size return size_t;
 349    function Get_Page_Size return Address;
 350    pragma Import (C, Get_Page_Size, "__getpagesize");
 351    --  Returns the size of a page
 352
 353    --  From /usr/include/i386-gnu/bits/mman.h
 354    PROT_NONE  : constant := 0;
 355    PROT_READ  : constant := 4;
 356    PROT_WRITE : constant := 2;
 357    PROT_EXEC  : constant := 1;
 358    PROT_ALL   : constant := PROT_READ + PROT_WRITE + PROT_EXEC;
 359    PROT_ON    : constant := PROT_NONE;
 360    PROT_OFF   : constant := PROT_ALL;
 361
 362    --  From /usr/include/i386-gnu/bits/mman.h
 363    function mprotect (addr : Address; len : size_t; prot : int) return int;
 364    pragma Import (C, mprotect);
 365
 366    ---------------------------------------
 367    -- Nonstandard Thread Initialization --
 368    ---------------------------------------
 369
 370    procedure pthread_init;
 371    pragma Inline (pthread_init);
 372    --  This is a dummy procedure to share some GNULLI files
 373
 374    -------------------------
 375    -- POSIX.1c  Section 3 --
 376    -------------------------
 377
 378    --  From: /usr/include/signal.h:
 379    --  sigwait (__const sigset_t *__restrict __set, int *__restrict __sig)
 380    function sigwait (set : access sigset_t; sig : access Signal) return int;
 381    pragma Import (C, sigwait, "sigwait");
 382
 383    --  From: /usr/include/pthread/pthread.h:
 384    --  extern int pthread_kill (pthread_t thread, int signo);
 385    function pthread_kill (thread : pthread_t; sig : Signal) return int;
 386    pragma Import (C, pthread_kill, "pthread_kill");
 387
 388    --  From: /usr/include/i386-gnu/bits/sigthread.h
 389    --  extern int pthread_sigmask (int __how, __const __sigset_t *__newmask,
 390    --  __sigset_t *__oldmask) __THROW;
 391    function pthread_sigmask
 392      (how  : int;
 393       set  : access sigset_t;
 394       oset : access sigset_t) return int;
 395    pragma Import (C, pthread_sigmask, "pthread_sigmask");
 396
 397    --------------------------
 398    -- POSIX.1c  Section 11 --
 399    --------------------------
 400
 401    --  From: /usr/include/pthread/pthread.h and
 402    --  /usr/include/pthread/pthreadtypes.h
 403    function pthread_mutexattr_init
 404      (attr : access pthread_mutexattr_t) return int;
 405    pragma Import (C, pthread_mutexattr_init, "pthread_mutexattr_init");
 406
 407    function pthread_mutexattr_destroy
 408      (attr : access pthread_mutexattr_t) return int;
 409    pragma Import (C, pthread_mutexattr_destroy, "pthread_mutexattr_destroy");
 410
 411    function pthread_mutex_init
 412      (mutex : access pthread_mutex_t;
 413       attr  : access pthread_mutexattr_t) return int;
 414    pragma Import (C, pthread_mutex_init, "pthread_mutex_init");
 415
 416    function pthread_mutex_destroy (mutex : access pthread_mutex_t) return int;
 417    pragma Import (C, pthread_mutex_destroy, "pthread_mutex_destroy");
 418
 419    function pthread_mutex_lock (mutex : access pthread_mutex_t) return int;
 420    pragma Import (C, pthread_mutex_lock, "pthread_mutex_lock");
 421
 422    function pthread_mutex_unlock (mutex : access pthread_mutex_t) return int;
 423    pragma Import (C, pthread_mutex_unlock, "pthread_mutex_unlock");
 424
 425    function pthread_rwlockattr_init
 426      (attr : access pthread_rwlockattr_t) return int;
 427    pragma Import (C, pthread_rwlockattr_init, "pthread_rwlockattr_init");
 428
 429    function pthread_rwlockattr_destroy
 430      (attr : access pthread_rwlockattr_t) return int;
 431    pragma Import (C, pthread_rwlockattr_destroy, "pthread_rwlockattr_destroy");
 432    PTHREAD_RWLOCK_PREFER_READER_NP              : constant := 0;
 433    PTHREAD_RWLOCK_PREFER_WRITER_NP              : constant := 1;
 434    PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP : constant := 2;
 435
 436    function pthread_rwlockattr_setkind_np
 437      (attr : access pthread_rwlockattr_t;
 438       pref : int) return int;
 439    pragma Import
 440      (C, pthread_rwlockattr_setkind_np, "pthread_rwlockattr_setkind_np");
 441
 442    function pthread_rwlock_init
 443      (mutex : access pthread_rwlock_t;
 444       attr  : access pthread_rwlockattr_t) return int;
 445    pragma Import (C, pthread_rwlock_init, "pthread_rwlock_init");
 446
 447    function pthread_rwlock_destroy
 448      (mutex : access pthread_rwlock_t) return int;
 449    pragma Import (C, pthread_rwlock_destroy, "pthread_rwlock_destroy");
 450
 451    function pthread_rwlock_rdlock (mutex : access pthread_rwlock_t) return int;
 452    pragma Import (C, pthread_rwlock_rdlock, "pthread_rwlock_rdlock");
 453
 454    function pthread_rwlock_wrlock (mutex : access pthread_rwlock_t) return int;
 455    pragma Import (C, pthread_rwlock_wrlock, "pthread_rwlock_wrlock");
 456
 457    function pthread_rwlock_unlock (mutex : access pthread_rwlock_t) return int;
 458    pragma Import (C, pthread_rwlock_unlock, "pthread_rwlock_unlock");
 459
 460    function pthread_condattr_init
 461      (attr : access pthread_condattr_t) return int;
 462    pragma Import (C, pthread_condattr_init, "pthread_condattr_init");
 463
 464    function pthread_condattr_destroy
 465      (attr : access pthread_condattr_t) return int;
 466    pragma Import (C, pthread_condattr_destroy, "pthread_condattr_destroy");
 467
 468    function pthread_cond_init
 469      (cond : access pthread_cond_t;
 470       attr : access pthread_condattr_t) return int;
 471    pragma Import (C, pthread_cond_init, "pthread_cond_init");
 472
 473    function pthread_cond_destroy (cond : access pthread_cond_t) return int;
 474    pragma Import (C, pthread_cond_destroy, "pthread_cond_destroy");
 475
 476    function pthread_cond_signal (cond : access pthread_cond_t) return int;
 477    pragma Import (C, pthread_cond_signal, "pthread_cond_signal");
 478
 479    function pthread_cond_wait
 480      (cond  : access pthread_cond_t;
 481       mutex : access pthread_mutex_t) return int;
 482    pragma Import (C, pthread_cond_wait, "pthread_cond_wait");
 483
 484    function pthread_cond_timedwait
 485      (cond    : access pthread_cond_t;
 486       mutex   : access pthread_mutex_t;
 487       abstime : access timespec) return int;
 488    pragma Import (C, pthread_cond_timedwait, "pthread_cond_timedwait");
 489
 490    Relative_Timed_Wait : constant Boolean := False;
 491    --  pthread_cond_timedwait requires an absolute delay time
 492
 493    --------------------------
 494    -- POSIX.1c  Section 13 --
 495    --------------------------
 496    --  From /usr/include/pthread/pthreadtypes.h
 497
 498    PTHREAD_PRIO_NONE    : constant := 0;
 499    PTHREAD_PRIO_PROTECT : constant := 2;
 500    PTHREAD_PRIO_INHERIT : constant := 1;
 501
 502    --  GNU/Hurd does not support Thread Priority Protection or Thread
 503    --  Priority Inheritance and lacks some pthread_mutexattr_* functions.
 504    --  Replace them with dummy versions.
 505    --  From: /usr/include/pthread/pthread.h
 506
 507    function pthread_mutexattr_setprotocol
 508      (attr     : access pthread_mutexattr_t;
 509       protocol : int) return int;
 510    pragma Import (C, pthread_mutexattr_setprotocol,
 511      "pthread_mutexattr_setprotocol");
 512
 513    function pthread_mutexattr_getprotocol
 514      (attr     : access pthread_mutexattr_t;
 515       protocol : access int) return int;
 516    pragma Import (C, pthread_mutexattr_getprotocol,
 517      "pthread_mutexattr_getprotocol");
 518
 519    function pthread_mutexattr_setprioceiling
 520      (attr     : access pthread_mutexattr_t;
 521       prioceiling : int) return int;
 522
 523    function pthread_mutexattr_getprioceiling
 524      (attr     : access pthread_mutexattr_t;
 525       prioceiling : access int) return int;
 526
 527    type struct_sched_param is record
 528       sched_priority : int;  --  scheduling priority
 529    end record;
 530    pragma Convention (C, struct_sched_param);
 531
 532    function pthread_setschedparam
 533      (thread : pthread_t;
 534       policy : int;
 535       param  : access struct_sched_param) return int;
 536
 537    function pthread_attr_setscope
 538      (attr            : access pthread_attr_t;
 539       contentionscope : int) return int;
 540    pragma Import (C, pthread_attr_setscope, "pthread_attr_setscope");
 541
 542    function pthread_attr_getscope
 543      (attr            : access pthread_attr_t;
 544       contentionscope : access int) return int;
 545    pragma Import (C, pthread_attr_getscope, "pthread_attr_getscope");
 546
 547    function pthread_attr_setinheritsched
 548      (attr            : access pthread_attr_t;
 549       inheritsched : int) return int;
 550    pragma Import (C, pthread_attr_setinheritsched,
 551      "pthread_attr_setinheritsched");
 552
 553    function pthread_attr_getinheritsched
 554      (attr         : access pthread_attr_t;
 555       inheritsched : access int) return int;
 556    pragma Import (C, pthread_attr_getinheritsched,
 557      "pthread_attr_getinheritsched");
 558
 559    function pthread_attr_setschedpolicy
 560      (attr   : access pthread_attr_t;
 561       policy : int) return int;
 562    pragma Import (C, pthread_attr_setschedpolicy, "pthread_setschedpolicy");
 563
 564    function sched_yield return int;
 565    pragma Import (C, sched_yield, "sched_yield");
 566
 567    ---------------------------
 568    -- P1003.1c - Section 16 --
 569    ---------------------------
 570
 571    function pthread_attr_init
 572      (attributes : access pthread_attr_t) return int;
 573    pragma Import (C, pthread_attr_init, "pthread_attr_init");
 574
 575    function pthread_attr_destroy
 576      (attributes : access pthread_attr_t) return int;
 577    pragma Import (C, pthread_attr_destroy, "pthread_attr_destroy");
 578
 579    function pthread_attr_setdetachstate
 580      (attr        : access pthread_attr_t;
 581       detachstate : int) return int;
 582    pragma Import
 583      (C, pthread_attr_setdetachstate, "pthread_attr_setdetachstate");
 584
 585    function pthread_attr_setstacksize
 586      (attr      : access pthread_attr_t;
 587       stacksize : size_t) return int;
 588    pragma Import (C, pthread_attr_setstacksize, "pthread_attr_setstacksize");
 589
 590    --  From: /usr/include/pthread/pthread.h
 591    function pthread_create
 592      (thread        : access pthread_t;
 593       attributes    : access pthread_attr_t;
 594       start_routine : Thread_Body;
 595       arg           : System.Address) return int;
 596    pragma Import (C, pthread_create, "pthread_create");
 597
 598    procedure pthread_exit (status : System.Address);
 599    pragma Import (C, pthread_exit, "pthread_exit");
 600
 601    function pthread_self return pthread_t;
 602    pragma Import (C, pthread_self, "pthread_self");
 603
 604    --------------------------
 605    -- POSIX.1c  Section 17 --
 606    --------------------------
 607
 608    function pthread_setspecific
 609      (key   : pthread_key_t;
 610       value : System.Address) return int;
 611    pragma Import (C, pthread_setspecific, "pthread_setspecific");
 612
 613    function pthread_getspecific (key : pthread_key_t) return System.Address;
 614    pragma Import (C, pthread_getspecific, "pthread_getspecific");
 615
 616    type destructor_pointer is access procedure (arg : System.Address);
 617    pragma Convention (C, destructor_pointer);
 618
 619    function pthread_key_create
 620      (key        : access pthread_key_t;
 621       destructor : destructor_pointer) return int;
 622    pragma Import (C, pthread_key_create, "pthread_key_create");
 623
 624    --  From /usr/include/i386-gnu/bits/sched.h
 625    CPU_SETSIZE : constant := 1_024;
 626
 627    type bit_field is array (1 .. CPU_SETSIZE) of Boolean;
 628    for bit_field'Size use CPU_SETSIZE;
 629    pragma Pack (bit_field);
 630    pragma Convention (C, bit_field);
 631
 632    type cpu_set_t is record
 633       bits : bit_field;
 634    end record;
 635    pragma Convention (C, cpu_set_t);
 636
 637 private
 638
 639    type sigset_t is array (1 .. 4) of unsigned;
 640
 641    --  In GNU/Hurd the component sa_handler turns out to
 642    --  be one a union type, and the selector is a macro:
 643    --  #define sa_handler __sigaction_handler.sa_handler
 644    --  #define sa_sigaction __sigaction_handler.sa_sigaction
 645
 646    --  Should we add a signal_context type here ?
 647    --  How could it be done independent of the CPU architecture ?
 648    --  sigcontext type is opaque, so it is architecturally neutral.
 649    --  It is always passed as an access type, so define it as an empty record
 650    --  since the contents are not used anywhere.
 651    type struct_sigcontext is null record;
 652    pragma Convention (C, struct_sigcontext);
 653
 654    type pid_t is new int;
 655
 656    type time_t is new long;
 657
 658    type timespec is record
 659       tv_sec  : time_t;
 660       tv_nsec : long;
 661    end record;
 662    pragma Convention (C, timespec);
 663
 664    --  From: /usr/include/pthread/pthreadtypes.h:
 665    --  typedef struct __pthread_attr pthread_attr_t;
 666    --  /usr/include/i386-gnu/bits/thread-attr.h: struct __pthread_attr...
 667    --  /usr/include/pthread/pthreadtypes.h: enum __pthread_contentionscope
 668    --   enum __pthread_detachstate detachstate;
 669    --   enum __pthread_inheritsched inheritsched;
 670    --   enum __pthread_contentionscope contentionscope;
 671    --   Not used: schedpolicy   : int;
 672    type pthread_attr_t is record
 673       schedparam    : struct_sched_param;
 674       stackaddr     : System.Address;
 675       stacksize     : size_t;
 676       guardsize     : size_t;
 677       detachstate   : int;
 678       inheritsched  : int;
 679       contentionscope : int;
 680       schedpolicy   : int;
 681    end record;
 682    pragma Convention (C, pthread_attr_t);
 683
 684    --  From: /usr/include/pthread/pthreadtypes.h:
 685    --  typedef struct __pthread_condattr pthread_condattr_t;
 686    --  From: /usr/include/i386-gnu/bits/condition-attr.h:
 687    --  struct __pthread_condattr {
 688    --    enum __pthread_process_shared pshared;
 689    --    __Clockid_T Clock;}
 690    --  From: /usr/include/pthread/pthreadtypes.h:
 691    --  enum __pthread_process_shared
 692    type pthread_condattr_t is record
 693       pshared : int;
 694       clock   : clockid_t;
 695    end record;
 696    pragma Convention (C, pthread_condattr_t);
 697
 698    --  From: /usr/include/pthread/pthreadtypes.h:
 699    --  typedef struct __pthread_mutexattr pthread_mutexattr_t; and
 700    --  /usr/include/i386-gnu/bits/mutex-attr.h
 701    --  struct __pthread_mutexattr {
 702    --  int prioceiling;
 703    --  enum __pthread_mutex_protocol protocol;
 704    --  enum __pthread_process_shared pshared;
 705    --  enum __pthread_mutex_type mutex_type;};
 706    type pthread_mutexattr_t is record
 707       prioceiling : int;
 708       protocol    : int;
 709       pshared     : int;
 710       mutex_type  : int;
 711    end record;
 712    pragma Convention (C, pthread_mutexattr_t);
 713
 714    --  From: /usr/include/pthread/pthreadtypes.h
 715    --  typedef struct __pthread_mutex pthread_mutex_t; and
 716    --  /usr/include/i386-gnu/bits/mutex.h:
 717    --  struct __pthread_mutex {
 718    --  __pthread_spinlock_t __held;
 719    --  __pthread_spinlock_t __lock;
 720    --  /* in cthreads, mutex_init does not initialized the third
 721    --    pointer, as such, we cannot rely on its value for anything.  */
 722    --    char *cthreadscompat1;
 723    --  struct __pthread *__queue;
 724    --  struct __pthread_mutexattr *attr;
 725    --  void *data;
 726    --  /*  up to this point, we are completely compatible with cthreads
 727    --    and what libc expects.  */
 728    --    void *owner;
 729    --  unsigned locks;
 730    --  /* if null then the default attributes apply.  */
 731    --    };
 732
 733    type pthread_mutex_t is record
 734       held          : int;
 735       lock          : int;
 736       cthreadcompat : System.Address;
 737       queue         : System.Address;
 738       attr          : System.Address;
 739       data          : System.Address;
 740       owner         : System.Address;
 741       locks         : unsigned;
 742    end record;
 743    pragma Convention (C, pthread_mutex_t);
 744    --  pointer needed?
 745    --  type pthread_mutex_t_ptr is access pthread_mutex_t;
 746
 747    --  From: /usr/include/pthread/pthreadtypes.h:
 748    --  typedef struct __pthread_cond pthread_cond_t;
 749    --  typedef struct __pthread_condattr pthread_condattr_t;
 750    --  /usr/include/i386-gnu/bits/condition.h:struct __pthread_cond{}
 751    --  pthread_condattr_t: see above!
 752    --  /usr/include/i386-gnu/bits/condition.h:
 753    --  struct __pthread_condimpl *__impl;
 754
 755    type pthread_cond_t is record
 756       lock       : int;
 757       queue      : System.Address;
 758       condattr   : System.Address;
 759       impl       : System.Address;
 760       data       : System.Address;
 761    end record;
 762    pragma Convention (C, pthread_cond_t);
 763
 764    --  From: /usr/include/pthread/pthreadtypes.h:
 765    --  typedef __pthread_key pthread_key_t; and
 766    --  /usr/include/i386-gnu/bits/thread-specific.h:
 767    --  typedef int __pthread_key;
 768
 769    type pthread_key_t is new int;
 770
 771    --  From: /usr/include/i386-gnu/bits/rwlock-attr.h:
 772    --  struct __pthread_rwlockattr {
 773    --  enum __pthread_process_shared pshared; };
 774
 775    type pthread_rwlockattr_t is record
 776       pshared : int;
 777    end record;
 778    pragma Convention (C, pthread_rwlockattr_t);
 779
 780    --  From: /usr/include/i386-gnu/bits/rwlock.h:
 781    --  struct __pthread_rwlock {
 782    --  __pthread_spinlock_t __held;
 783    --  __pthread_spinlock_t __lock;
 784    --  int readers;
 785    --  struct __pthread *readerqueue;
 786    --  struct __pthread *writerqueue;
 787    --  struct __pthread_rwlockattr *__attr;
 788    --  void *__data; };
 789
 790    type pthread_rwlock_t is record
 791       held        : int;
 792       lock        : int;
 793       readers     : int;
 794       readerqueue : System.Address;
 795       writerqueue : System.Address;
 796       attr        : pthread_rwlockattr_t;
 797       data        : int;
 798    end record;
 799    pragma Convention (C, pthread_rwlock_t);
 800
 801 end System.OS_Interface;