gcc/ada/s-osinte-freebsd.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                  GNAT 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) 1995-2007, Free Software Foundation, Inc.         --
  11 --                                                                          --
  12 -- GNARL 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 2,  or (at your option) any later ver- --
  15 -- sion. GNARL 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.  See the GNU General Public License --
  18 -- for  more details.  You should have  received  a copy of the GNU General --
  19 -- Public License  distributed with GNARL; see file COPYING.  If not, write --
  20 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  21 -- Boston, MA 02110-1301, USA.                                              --
  22 --                                                                          --
  23 -- As a special exception,  if other files  instantiate  generics from this --
  24 -- unit, or you link  this unit with other files  to produce an executable, --
  25 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  26 -- covered  by the  GNU  General  Public  License.  This exception does not --
  27 -- however invalidate  any other reasons why  the executable file  might be --
  28 -- covered by the  GNU Public License.                                      --
  29 --                                                                          --
  30 -- GNARL was developed by the GNARL team at Florida State University. It is --
  31 -- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
  32 -- State University (http://www.gnat.com).                                  --
  33 --                                                                          --
  34 ------------------------------------------------------------------------------
  35
  36 --  This is the FreeBSD PTHREADS version of this package
  37
  38 --  This package encapsulates all direct interfaces to OS services
  39 --  that are needed by children of System.
  40
  41 --  PLEASE DO NOT add any with-clauses to this package or remove the pragma
  42 --  Preelaborate. This package is designed to be a bottom-level (leaf) package.
  43
  44 with Interfaces.C;
  45 with Ada.Unchecked_Conversion;
  46
  47 package System.OS_Interface is
  48    pragma Preelaborate;
  49
  50    pragma Linker_Options ("-pthread");
  51
  52    subtype int            is Interfaces.C.int;
  53    subtype short          is Interfaces.C.short;
  54    subtype long           is Interfaces.C.long;
  55    subtype unsigned       is Interfaces.C.unsigned;
  56    subtype unsigned_short is Interfaces.C.unsigned_short;
  57    subtype unsigned_long  is Interfaces.C.unsigned_long;
  58    subtype unsigned_char  is Interfaces.C.unsigned_char;
  59    subtype plain_char     is Interfaces.C.plain_char;
  60    subtype size_t         is Interfaces.C.size_t;
  61
  62    -----------
  63    -- Errno --
  64    -----------
  65
  66    function Errno return int;
  67    pragma Inline (Errno);
  68
  69    EAGAIN   : constant := 35;
  70    EINTR    : constant := 4;
  71    EINVAL   : constant := 22;
  72    ENOMEM   : constant := 12;
  73    ETIMEDOUT    : constant := 60;
  74
  75    -------------
  76    -- Signals --
  77    -------------
  78
  79    Max_Interrupt : constant := 31;
  80    type Signal is new int range 0 .. Max_Interrupt;
  81    for Signal'Size use int'Size;
  82
  83    SIGHUP     : constant := 1; --  hangup
  84    SIGINT     : constant := 2; --  interrupt (rubout)
  85    SIGQUIT    : constant := 3; --  quit (ASCD FS)
  86    SIGILL     : constant := 4; --  illegal instruction (not reset)
  87    SIGTRAP    : constant := 5; --  trace trap (not reset)
  88    SIGIOT     : constant := 6; --  IOT instruction
  89    SIGABRT    : constant := 6; --  used by abort, replace SIGIOT in the  future
  90    SIGEMT     : constant := 7; --  EMT instruction
  91    SIGFPE     : constant := 8; --  floating point exception
  92    SIGKILL    : constant := 9; --  kill (cannot be caught or ignored)
  93    SIGBUS     : constant := 10; --  bus error
  94    SIGSEGV    : constant := 11; --  segmentation violation
  95    SIGSYS     : constant := 12; --  bad argument to system call
  96    SIGPIPE    : constant := 13; --  write on a pipe with no one to read it
  97    SIGALRM    : constant := 14; --  alarm clock
  98    SIGTERM    : constant := 15; --  software termination signal from kill
  99    SIGURG     : constant := 16; --  urgent condition on IO channel
 100    SIGSTOP    : constant := 17; --  stop (cannot be caught or ignored)
 101    SIGTSTP    : constant := 18; --  user stop requested from tty
 102    SIGCONT    : constant := 19; --  stopped process has been continued
 103    SIGCLD     : constant := 20; --  alias for SIGCHLD
 104    SIGCHLD    : constant := 20; --  child status change
 105    SIGTTIN    : constant := 21; --  background tty read attempted
 106    SIGTTOU    : constant := 22; --  background tty write attempted
 107    SIGIO      : constant := 23; --  I/O possible (Solaris SIGPOLL alias)
 108    SIGXCPU    : constant := 24; --  CPU time limit exceeded
 109    SIGXFSZ    : constant := 25; --  filesize limit exceeded
 110    SIGVTALRM  : constant := 26; --  virtual timer expired
 111    SIGPROF    : constant := 27; --  profiling timer expired
 112    SIGWINCH   : constant := 28; --  window size change
 113    SIGINFO    : constant := 29; --  information request (NetBSD/FreeBSD)
 114    SIGUSR1    : constant := 30; --  user defined signal 1
 115    SIGUSR2    : constant := 31; --  user defined signal 2
 116
 117    SIGADAABORT : constant := SIGABRT;
 118    --  Change this if you want to use another signal for task abort.
 119    --  SIGTERM might be a good one.
 120
 121    type Signal_Set is array (Natural range <>) of Signal;
 122
 123    --  Interrupts that must be unmasked at all times.  FreeBSD
 124    --  pthreads will not allow an application to mask out any
 125    --  interrupt needed by the threads library.
 126    Unmasked : constant Signal_Set :=
 127      (SIGTRAP, SIGBUS, SIGTTIN, SIGTTOU, SIGTSTP);
 128
 129    --  FreeBSD will uses SIGPROF for timing.  Do not allow a
 130    --  handler to attach to this signal.
 131    Reserved : constant Signal_Set := (0 .. 0 => SIGPROF);
 132
 133    type sigset_t is private;
 134
 135    function sigaddset
 136      (set : access sigset_t;
 137       sig : Signal) return int;
 138    pragma Import (C, sigaddset, "sigaddset");
 139
 140    function sigdelset
 141      (set : access sigset_t;
 142       sig : Signal) return int;
 143    pragma Import (C, sigdelset, "sigdelset");
 144
 145    function sigfillset (set : access sigset_t) return int;
 146    pragma Import (C, sigfillset, "sigfillset");
 147
 148    function sigismember
 149      (set : access sigset_t;
 150       sig : Signal) return int;
 151    pragma Import (C, sigismember, "sigismember");
 152
 153    function sigemptyset (set : access sigset_t) return int;
 154    pragma Import (C, sigemptyset, "sigemptyset");
 155
 156    --  sigcontext is architecture dependent, so define it private
 157    type struct_sigcontext is private;
 158
 159    type old_struct_sigaction is record
 160       sa_handler : System.Address;
 161       sa_mask    : sigset_t;
 162       sa_flags   : int;
 163    end record;
 164    pragma Convention (C, old_struct_sigaction);
 165
 166    type new_struct_sigaction is record
 167       sa_handler : System.Address;
 168       sa_flags   : int;
 169       sa_mask    : sigset_t;
 170    end record;
 171    pragma Convention (C, new_struct_sigaction);
 172
 173    subtype struct_sigaction is new_struct_sigaction;
 174    type struct_sigaction_ptr is access all struct_sigaction;
 175
 176    SIG_BLOCK   : constant := 1;
 177    SIG_UNBLOCK : constant := 2;
 178    SIG_SETMASK : constant := 3;
 179
 180    SIG_DFL : constant := 0;
 181    SIG_IGN : constant := 1;
 182
 183    SA_SIGINFO : constant := 16#0040#;
 184
 185    function sigaction
 186      (sig  : Signal;
 187       act  : struct_sigaction_ptr;
 188       oact : struct_sigaction_ptr) return int;
 189    pragma Import (C, sigaction, "sigaction");
 190
 191    ----------
 192    -- Time --
 193    ----------
 194
 195    Time_Slice_Supported : constant Boolean := True;
 196    --  Indicates wether time slicing is supported (i.e SCHED_RR is supported)
 197
 198    type timespec is private;
 199
 200    function nanosleep (rqtp, rmtp : access timespec)  return int;
 201    pragma Import (C, nanosleep, "nanosleep");
 202
 203    type clockid_t is private;
 204
 205    CLOCK_REALTIME : constant clockid_t;
 206
 207    function clock_gettime
 208      (clock_id : clockid_t;
 209       tp       : access timespec)
 210       return int;
 211    pragma Import (C, clock_gettime, "clock_gettime");
 212
 213    function To_Duration (TS : timespec) return Duration;
 214    pragma Inline (To_Duration);
 215
 216    function To_Timespec (D : Duration) return timespec;
 217    pragma Inline (To_Timespec);
 218
 219    type struct_timezone is record
 220       tz_minuteswest : int;
 221       tz_dsttime     : int;
 222    end record;
 223    pragma Convention (C, struct_timezone);
 224
 225    procedure usleep (useconds : unsigned_long);
 226    pragma Import (C, usleep, "usleep");
 227
 228    -------------------------
 229    -- Priority Scheduling --
 230    -------------------------
 231
 232    SCHED_FIFO  : constant := 1;
 233    SCHED_OTHER : constant := 2;
 234    SCHED_RR    : constant := 3;
 235
 236    function To_Target_Priority
 237      (Prio : System.Any_Priority) return Interfaces.C.int;
 238    --  Maps System.Any_Priority to a POSIX priority
 239
 240    -------------
 241    -- Process --
 242    -------------
 243
 244    type pid_t is private;
 245
 246    Self_PID : constant pid_t;
 247
 248    function kill (pid : pid_t; sig : Signal) return int;
 249    pragma Import (C, kill, "kill");
 250
 251    function getpid return pid_t;
 252    pragma Import (C, getpid, "getpid");
 253
 254    ---------
 255    -- LWP --
 256    ---------
 257
 258    function lwp_self return System.Address;
 259    --  lwp_self does not exist on this thread library, revert to pthread_self
 260    --  which is the closest approximation (with getpid). This function is
 261    --  needed to share 7staprop.adb across POSIX-like targets.
 262    pragma Import (C, lwp_self, "pthread_self");
 263
 264    -------------
 265    -- Threads --
 266    -------------
 267
 268    type Thread_Body is access
 269      function (arg : System.Address) return System.Address;
 270    pragma Convention (C, Thread_Body);
 271
 272    function Thread_Body_Access is new
 273      Ada.Unchecked_Conversion (System.Address, Thread_Body);
 274
 275    type pthread_t           is private;
 276    subtype Thread_Id        is pthread_t;
 277
 278    type pthread_mutex_t     is limited private;
 279    type pthread_cond_t      is limited private;
 280    type pthread_attr_t      is limited private;
 281    type pthread_mutexattr_t is limited private;
 282    type pthread_condattr_t  is limited private;
 283    type pthread_key_t       is private;
 284
 285    PTHREAD_CREATE_DETACHED : constant := 1;
 286    PTHREAD_CREATE_JOINABLE : constant := 0;
 287
 288    PTHREAD_SCOPE_PROCESS : constant := 0;
 289    PTHREAD_SCOPE_SYSTEM  : constant := 2;
 290
 291    -----------
 292    -- Stack --
 293    -----------
 294
 295    Stack_Base_Available : constant Boolean := False;
 296    --  Indicates wether the stack base is available on this target.
 297    --  This allows us to share s-osinte.adb between all the FSU run time.
 298    --  Note that this value can only be true if pthread_t has a complete
 299    --  definition that corresponds exactly to the C header files.
 300
 301    function Get_Stack_Base (thread : pthread_t) return Address;
 302    pragma Inline (Get_Stack_Base);
 303    --  returns the stack base of the specified thread.
 304    --  Only call this function when Stack_Base_Available is True.
 305
 306    function Get_Page_Size return size_t;
 307    function Get_Page_Size return Address;
 308    pragma Import (C, Get_Page_Size, "getpagesize");
 309    --  returns the size of a page, or 0 if this is not relevant on this
 310    --  target
 311
 312    PROT_NONE  : constant := 0;
 313    PROT_READ  : constant := 1;
 314    PROT_WRITE : constant := 2;
 315    PROT_EXEC  : constant := 4;
 316    PROT_ALL   : constant := PROT_READ + PROT_WRITE + PROT_EXEC;
 317
 318    PROT_ON    : constant := PROT_NONE;
 319    PROT_OFF   : constant := PROT_ALL;
 320
 321    function mprotect
 322      (addr : Address; len : size_t; prot : int) return int;
 323    pragma Import (C, mprotect);
 324
 325    ---------------------------------------
 326    -- Nonstandard Thread Initialization --
 327    ---------------------------------------
 328
 329    --  FSU_THREADS requires pthread_init, which is nonstandard and
 330    --  this should be invoked during the elaboration of s-taprop.adb
 331
 332    --  FreeBSD does not require this so we provide an empty Ada body
 333
 334    procedure pthread_init;
 335
 336    -------------------------
 337    -- POSIX.1c  Section 3 --
 338    -------------------------
 339
 340    function sigwait
 341      (set : access sigset_t;
 342       sig : access Signal) return int;
 343    pragma Import (C, sigwait, "sigwait");
 344
 345    function pthread_kill
 346      (thread : pthread_t;
 347       sig    : Signal) return int;
 348    pragma Import (C, pthread_kill, "pthread_kill");
 349
 350    function pthread_sigmask
 351      (how  : int;
 352       set  : access sigset_t;
 353       oset : access sigset_t) return int;
 354    pragma Import (C, pthread_sigmask, "pthread_sigmask");
 355
 356    --------------------------
 357    -- POSIX.1c  Section 11 --
 358    --------------------------
 359
 360    function pthread_mutexattr_init
 361      (attr : access pthread_mutexattr_t) return int;
 362    pragma Import (C, pthread_mutexattr_init, "pthread_mutexattr_init");
 363
 364    function pthread_mutexattr_destroy
 365      (attr : access pthread_mutexattr_t) return int;
 366    pragma Import (C, pthread_mutexattr_destroy, "pthread_mutexattr_destroy");
 367
 368    function pthread_mutex_init
 369      (mutex : access pthread_mutex_t;
 370       attr  : access pthread_mutexattr_t) return int;
 371    pragma Import (C, pthread_mutex_init, "pthread_mutex_init");
 372
 373    function pthread_mutex_destroy (mutex : access pthread_mutex_t) return int;
 374    pragma Import (C, pthread_mutex_destroy, "pthread_mutex_destroy");
 375
 376    function pthread_mutex_lock (mutex : access pthread_mutex_t) return int;
 377    pragma Import (C, pthread_mutex_lock, "pthread_mutex_lock");
 378
 379    function pthread_mutex_unlock (mutex : access pthread_mutex_t) return int;
 380    pragma Import (C, pthread_mutex_unlock, "pthread_mutex_unlock");
 381
 382    function pthread_condattr_init
 383      (attr : access pthread_condattr_t) return int;
 384    pragma Import (C, pthread_condattr_init, "pthread_condattr_init");
 385
 386    function pthread_condattr_destroy
 387      (attr : access pthread_condattr_t) return int;
 388    pragma Import (C, pthread_condattr_destroy, "pthread_condattr_destroy");
 389
 390    function pthread_cond_init
 391      (cond : access pthread_cond_t;
 392       attr : access pthread_condattr_t) return int;
 393    pragma Import (C, pthread_cond_init, "pthread_cond_init");
 394
 395    function pthread_cond_destroy (cond : access pthread_cond_t) return int;
 396    pragma Import (C, pthread_cond_destroy, "pthread_cond_destroy");
 397
 398    function pthread_cond_signal (cond : access pthread_cond_t) return int;
 399    pragma Import (C, pthread_cond_signal, "pthread_cond_signal");
 400
 401    function pthread_cond_wait
 402      (cond  : access pthread_cond_t;
 403       mutex : access pthread_mutex_t) return int;
 404    pragma Import (C, pthread_cond_wait, "pthread_cond_wait");
 405
 406    function pthread_cond_timedwait
 407      (cond    : access pthread_cond_t;
 408       mutex   : access pthread_mutex_t;
 409       abstime : access timespec) return int;
 410    pragma Import (C, pthread_cond_timedwait, "pthread_cond_timedwait");
 411
 412    Relative_Timed_Wait : constant Boolean := False;
 413    --  pthread_cond_timedwait requires an absolute delay time
 414
 415    --------------------------
 416    -- POSIX.1c  Section 13 --
 417    --------------------------
 418
 419    PTHREAD_PRIO_NONE    : constant := 0;
 420    PTHREAD_PRIO_PROTECT : constant := 2;
 421    PTHREAD_PRIO_INHERIT : constant := 1;
 422
 423    function pthread_mutexattr_setprotocol
 424      (attr     : access pthread_mutexattr_t;
 425       protocol : int) return int;
 426    pragma Import
 427       (C, pthread_mutexattr_setprotocol, "pthread_mutexattr_setprotocol");
 428
 429    function pthread_mutexattr_getprotocol
 430      (attr     : access pthread_mutexattr_t;
 431       protocol : access int) return int;
 432    pragma Import
 433      (C, pthread_mutexattr_getprotocol, "pthread_mutexattr_getprotocol");
 434
 435    function pthread_mutexattr_setprioceiling
 436      (attr     : access pthread_mutexattr_t;
 437       prioceiling : int) return int;
 438    pragma Import
 439      (C, pthread_mutexattr_setprioceiling,
 440       "pthread_mutexattr_setprioceiling");
 441
 442    function pthread_mutexattr_getprioceiling
 443      (attr     : access pthread_mutexattr_t;
 444       prioceiling : access int) return int;
 445    pragma Import
 446      (C, pthread_mutexattr_getprioceiling,
 447       "pthread_mutexattr_getprioceiling");
 448
 449    type struct_sched_param is record
 450       sched_priority : int;
 451    end record;
 452    pragma Convention (C, struct_sched_param);
 453
 454    function pthread_getschedparam
 455      (thread : pthread_t;
 456       policy : access int;
 457       param  : access struct_sched_param) return int;
 458    pragma Import (C, pthread_getschedparam, "pthread_getschedparam");
 459
 460    function pthread_setschedparam
 461      (thread : pthread_t;
 462       policy : int;
 463       param  : access struct_sched_param) return int;
 464    pragma Import (C, pthread_setschedparam, "pthread_setschedparam");
 465
 466    function pthread_attr_setscope
 467      (attr            : access pthread_attr_t;
 468       contentionscope : int) return int;
 469    pragma Import (C, pthread_attr_setscope, "pthread_attr_setscope");
 470
 471    function pthread_attr_getscope
 472      (attr            : access pthread_attr_t;
 473       contentionscope : access int) return int;
 474    pragma Import (C, pthread_attr_getscope, "pthread_attr_getscope");
 475
 476    function pthread_attr_setinheritsched
 477      (attr            : access pthread_attr_t;
 478       inheritsched : int) return int;
 479    pragma Import
 480      (C, pthread_attr_setinheritsched, "pthread_attr_setinheritsched");
 481
 482    function pthread_attr_getinheritsched
 483      (attr         : access pthread_attr_t;
 484       inheritsched : access int) return int;
 485    pragma Import
 486      (C, pthread_attr_getinheritsched, "pthread_attr_getinheritsched");
 487
 488    function pthread_attr_setschedpolicy
 489      (attr   : access pthread_attr_t;
 490       policy : int) return int;
 491    pragma Import (C, pthread_attr_setschedpolicy,
 492      "pthread_attr_setschedpolicy");
 493
 494    function pthread_attr_getschedpolicy
 495      (attr   : access pthread_attr_t;
 496       policy : access int) return int;
 497    pragma Import (C, pthread_attr_getschedpolicy,
 498      "pthread_attr_getschedpolicy");
 499
 500    function pthread_attr_setschedparam
 501      (attr        : access pthread_attr_t;
 502       sched_param : int) return int;
 503    pragma Import (C, pthread_attr_setschedparam, "pthread_attr_setschedparam");
 504
 505    function pthread_attr_getschedparam
 506      (attr        : access pthread_attr_t;
 507       sched_param : access int) return int;
 508    pragma Import (C, pthread_attr_getschedparam, "pthread_attr_getschedparam");
 509
 510    function sched_yield return int;
 511    pragma Import (C, sched_yield, "pthread_yield");
 512
 513    --------------------------
 514    -- P1003.1c  Section 16 --
 515    --------------------------
 516
 517    function pthread_attr_init (attributes : access pthread_attr_t) return int;
 518    pragma Import (C, pthread_attr_init, "pthread_attr_init");
 519
 520    function pthread_attr_destroy
 521      (attributes : access pthread_attr_t) return int;
 522    pragma Import (C, pthread_attr_destroy, "pthread_attr_destroy");
 523
 524    function pthread_attr_setdetachstate
 525      (attr        : access pthread_attr_t;
 526       detachstate : int) return int;
 527    pragma Import
 528      (C, pthread_attr_setdetachstate, "pthread_attr_setdetachstate");
 529
 530    function pthread_attr_getdetachstate
 531      (attr        : access pthread_attr_t;
 532       detachstate : access int) return int;
 533    pragma Import
 534      (C, pthread_attr_getdetachstate, "pthread_attr_getdetachstate");
 535
 536    function pthread_attr_getstacksize
 537      (attr      : access pthread_attr_t;
 538       stacksize : access size_t) return int;
 539    pragma Import
 540      (C, pthread_attr_getstacksize, "pthread_attr_getstacksize");
 541
 542    function pthread_attr_setstacksize
 543      (attr      : access pthread_attr_t;
 544       stacksize : size_t) return int;
 545    pragma Import
 546      (C, pthread_attr_setstacksize, "pthread_attr_setstacksize");
 547
 548    function pthread_create
 549      (thread        : access pthread_t;
 550       attributes    : access pthread_attr_t;
 551       start_routine : Thread_Body;
 552       arg           : System.Address) return int;
 553    pragma Import (C, pthread_create, "pthread_create");
 554
 555    function pthread_detach (thread : pthread_t) return int;
 556    pragma Import (C, pthread_detach, "pthread_detach");
 557
 558    procedure pthread_exit (status : System.Address);
 559    pragma Import (C, pthread_exit, "pthread_exit");
 560
 561    function pthread_self return pthread_t;
 562    pragma Import (C, pthread_self, "pthread_self");
 563
 564    --------------------------
 565    -- POSIX.1c  Section 17 --
 566    --------------------------
 567
 568    function pthread_setspecific
 569      (key   : pthread_key_t;
 570       value : System.Address) return  int;
 571    pragma Import (C, pthread_setspecific, "pthread_setspecific");
 572
 573    function pthread_getspecific (key : pthread_key_t) return System.Address;
 574    pragma Import (C, pthread_getspecific, "pthread_getspecific");
 575
 576    type destructor_pointer is access procedure (arg : System.Address);
 577    pragma Convention (C, destructor_pointer);
 578
 579    function pthread_key_create
 580      (key        : access pthread_key_t;
 581       destructor : destructor_pointer) return int;
 582    pragma Import (C, pthread_key_create, "pthread_key_create");
 583
 584    ------------------------------------
 585    -- Non-portable Pthread Functions --
 586    ------------------------------------
 587
 588    function pthread_set_name_np
 589      (thread : pthread_t;
 590       name   : System.Address) return int;
 591    pragma Import (C, pthread_set_name_np, "pthread_set_name_np");
 592
 593 private
 594
 595    type sigset_t is array (1 .. 4) of unsigned;
 596
 597    --  In FreeBSD the component sa_handler turns out to
 598    --  be one a union type, and the selector is a macro:
 599    --  #define sa_handler __sigaction_u._handler
 600    --  #define sa_sigaction __sigaction_u._sigaction
 601
 602    --  Should we add a signal_context type here ???
 603    --  How could it be done independent of the CPU architecture ???
 604    --  sigcontext type is opaque, so it is architecturally neutral.
 605    --  It is always passed as an access type, so define it as an empty record
 606    --  since the contents are not used anywhere.
 607
 608    type struct_sigcontext is null record;
 609    pragma Convention (C, struct_sigcontext);
 610
 611    type pid_t is new int;
 612    Self_PID : constant pid_t := 0;
 613
 614    type time_t is new long;
 615
 616    type timespec is record
 617       ts_sec  : time_t;
 618       ts_nsec : long;
 619    end record;
 620    pragma Convention (C, timespec);
 621
 622    type clockid_t is new int;
 623    CLOCK_REALTIME : constant clockid_t := 0;
 624
 625    type pthread_t           is new System.Address;
 626    type pthread_attr_t      is new System.Address;
 627    type pthread_mutex_t     is new System.Address;
 628    type pthread_mutexattr_t is new System.Address;
 629    type pthread_cond_t      is new System.Address;
 630    type pthread_condattr_t  is new System.Address;
 631    type pthread_key_t       is new int;
 632
 633 end System.OS_Interface;