gcc/ada/libgnarl/s-osinte__dragonfly.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) 1995-2023, 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. It is --
  29 -- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
  30 -- State University (http://www.gnat.com).                                  --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 --  This is the DragonFly BSD PTHREADS version of this package
  35
  36 --  This package encapsulates all direct interfaces to OS services
  37 --  that are needed by the tasking run-time (libgnarl).
  38
  39 --  PLEASE DO NOT add any with-clauses to this package or remove the pragma
  40 --  Preelaborate. This package is designed to be a bottom-level (leaf) package.
  41
  42 with Ada.Unchecked_Conversion;
  43
  44 with Interfaces.C;
  45
  46 with System.Parameters;
  47
  48 package System.OS_Interface is
  49    pragma Preelaborate;
  50
  51    pragma Linker_Options ("-pthread");
  52
  53    subtype int            is Interfaces.C.int;
  54    subtype short          is Interfaces.C.short;
  55    subtype long           is Interfaces.C.long;
  56    subtype unsigned       is Interfaces.C.unsigned;
  57    subtype unsigned_short is Interfaces.C.unsigned_short;
  58    subtype unsigned_long  is Interfaces.C.unsigned_long;
  59    subtype unsigned_char  is Interfaces.C.unsigned_char;
  60    subtype plain_char     is Interfaces.C.plain_char;
  61    subtype size_t         is Interfaces.C.size_t;
  62
  63    -----------
  64    -- Errno --
  65    -----------
  66
  67    function Errno return int;
  68    pragma Inline (Errno);
  69
  70    EAGAIN    : constant := 35;
  71    EINTR     : constant := 4;
  72    EINVAL    : constant := 22;
  73    ENOMEM    : constant := 12;
  74    ETIMEDOUT : constant := 60;
  75
  76    -------------
  77    -- Signals --
  78    -------------
  79
  80    Max_Interrupt : constant := 31;
  81    type Signal is new int range 0 .. Max_Interrupt;
  82    for Signal'Size use int'Size;
  83
  84    SIGHUP     : constant := 1; --  hangup
  85    SIGINT     : constant := 2; --  interrupt (rubout)
  86    SIGQUIT    : constant := 3; --  quit (ASCD FS)
  87    SIGILL     : constant := 4; --  illegal instruction (not reset)
  88    SIGTRAP    : constant := 5; --  trace trap (not reset)
  89    SIGIOT     : constant := 6; --  IOT instruction
  90    SIGABRT    : constant := 6; --  used by abort, replace SIGIOT in the  future
  91    SIGEMT     : constant := 7; --  EMT instruction
  92    SIGFPE     : constant := 8; --  floating point exception
  93    SIGKILL    : constant := 9; --  kill (cannot be caught or ignored)
  94    SIGBUS     : constant := 10; --  bus error
  95    SIGSEGV    : constant := 11; --  segmentation violation
  96    SIGSYS     : constant := 12; --  bad argument to system call
  97    SIGPIPE    : constant := 13; --  write on a pipe with no one to read it
  98    SIGALRM    : constant := 14; --  alarm clock
  99    SIGTERM    : constant := 15; --  software termination signal from kill
 100    SIGURG     : constant := 16; --  urgent condition on IO channel
 101    SIGSTOP    : constant := 17; --  stop (cannot be caught or ignored)
 102    SIGTSTP    : constant := 18; --  user stop requested from tty
 103    SIGCONT    : constant := 19; --  stopped process has been continued
 104    SIGCLD     : constant := 20; --  alias for SIGCHLD
 105    SIGCHLD    : constant := 20; --  child status change
 106    SIGTTIN    : constant := 21; --  background tty read attempted
 107    SIGTTOU    : constant := 22; --  background tty write attempted
 108    SIGIO      : constant := 23; --  I/O possible (Solaris SIGPOLL alias)
 109    SIGXCPU    : constant := 24; --  CPU time limit exceeded
 110    SIGXFSZ    : constant := 25; --  filesize limit exceeded
 111    SIGVTALRM  : constant := 26; --  virtual timer expired
 112    SIGPROF    : constant := 27; --  profiling timer expired
 113    SIGWINCH   : constant := 28; --  window size change
 114    SIGINFO    : constant := 29; --  information request (BSD)
 115    SIGUSR1    : constant := 30; --  user defined signal 1
 116    SIGUSR2    : constant := 31; --  user defined signal 2
 117
 118    SIGADAABORT : constant := SIGABRT;
 119    --  Change this if you want to use another signal for task abort.
 120    --  SIGTERM might be a good one.
 121
 122    type Signal_Set is array (Natural range <>) of Signal;
 123
 124    --  Interrupts that must be unmasked at all times.  DragonFlyBSD
 125    --  pthreads will not allow an application to mask out any
 126    --  interrupt needed by the threads library.
 127    Unmasked : constant Signal_Set :=
 128      (SIGTRAP, SIGBUS, SIGTTIN, SIGTTOU, SIGTSTP);
 129
 130    --  DragonFlyBSD will uses SIGPROF for timing.  Do not allow a
 131    --  handler to attach to this signal.
 132    Reserved : constant Signal_Set := (0 .. 0 => SIGPROF);
 133
 134    type sigset_t is private;
 135
 136    function sigaddset
 137      (set : access sigset_t;
 138       sig : Signal) return int;
 139    pragma Import (C, sigaddset, "sigaddset");
 140
 141    function sigdelset
 142      (set : access sigset_t;
 143       sig : Signal) return int;
 144    pragma Import (C, sigdelset, "sigdelset");
 145
 146    function sigfillset (set : access sigset_t) return int;
 147    pragma Import (C, sigfillset, "sigfillset");
 148
 149    function sigismember
 150      (set : access sigset_t;
 151       sig : Signal) return int;
 152    pragma Import (C, sigismember, "sigismember");
 153
 154    function sigemptyset (set : access sigset_t) return int;
 155    pragma Import (C, sigemptyset, "sigemptyset");
 156
 157    --  sigcontext is architecture dependent, so define it private
 158    type struct_sigcontext is private;
 159
 160    type old_struct_sigaction is record
 161       sa_handler : System.Address;
 162       sa_mask    : sigset_t;
 163       sa_flags   : int;
 164    end record;
 165    pragma Convention (C, old_struct_sigaction);
 166
 167    type new_struct_sigaction is record
 168       sa_handler : System.Address;
 169       sa_flags   : int;
 170       sa_mask    : sigset_t;
 171    end record;
 172    pragma Convention (C, new_struct_sigaction);
 173
 174    subtype struct_sigaction is new_struct_sigaction;
 175    type struct_sigaction_ptr is access all struct_sigaction;
 176
 177    SIG_BLOCK   : constant := 1;
 178    SIG_UNBLOCK : constant := 2;
 179    SIG_SETMASK : constant := 3;
 180
 181    SIG_DFL : constant := 0;
 182    SIG_IGN : constant := 1;
 183
 184    SA_SIGINFO : constant := 16#0040#;
 185    SA_ONSTACK : constant := 16#0001#;
 186
 187    function sigaction
 188      (sig  : Signal;
 189       act  : struct_sigaction_ptr;
 190       oact : struct_sigaction_ptr) return int;
 191    pragma Import (C, sigaction, "sigaction");
 192
 193    ----------
 194    -- Time --
 195    ----------
 196
 197    Time_Slice_Supported : constant Boolean := True;
 198    --  Indicates whether time slicing is supported (i.e SCHED_RR is supported)
 199
 200    type timespec is private;
 201
 202    function nanosleep (rqtp, rmtp : access timespec)  return int;
 203    pragma Import (C, nanosleep, "nanosleep");
 204
 205    type clockid_t is new unsigned_long;
 206
 207    function clock_getres
 208      (clock_id : clockid_t;
 209       res      : access timespec) return int;
 210    pragma Import (C, clock_getres, "clock_getres");
 211
 212    function clock_gettime
 213      (clock_id : clockid_t;
 214       tp       : access timespec)
 215       return int;
 216    pragma Import (C, clock_gettime, "clock_gettime");
 217
 218    function To_Duration (TS : timespec) return Duration;
 219    pragma Inline (To_Duration);
 220
 221    function To_Timespec (D : Duration) return timespec;
 222    pragma Inline (To_Timespec);
 223
 224    type struct_timezone is record
 225       tz_minuteswest : int;
 226       tz_dsttime     : int;
 227    end record;
 228    pragma Convention (C, struct_timezone);
 229
 230    procedure usleep (useconds : unsigned_long);
 231    pragma Import (C, usleep, "usleep");
 232
 233    -------------------------
 234    -- Priority Scheduling --
 235    -------------------------
 236
 237    SCHED_FIFO  : constant := 1;
 238    SCHED_OTHER : constant := 2;
 239    SCHED_RR    : constant := 3;
 240
 241    function To_Target_Priority
 242      (Prio : System.Any_Priority) return Interfaces.C.int;
 243    --  Maps System.Any_Priority to a POSIX priority
 244
 245    -------------
 246    -- Process --
 247    -------------
 248
 249    type pid_t is private;
 250
 251    function kill (pid : pid_t; sig : Signal) return int;
 252    pragma Import (C, kill, "kill");
 253
 254    function getpid return pid_t;
 255    pragma Import (C, getpid, "getpid");
 256
 257    ---------
 258    -- LWP --
 259    ---------
 260
 261    function lwp_self return System.Address;
 262    --  lwp_self does not exist on this thread library, revert to pthread_self
 263    --  which is the closest approximation (with getpid). This function is
 264    --  needed to share 7staprop.adb across POSIX-like targets.
 265    pragma Import (C, lwp_self, "pthread_self");
 266
 267    -------------
 268    -- Threads --
 269    -------------
 270
 271    type Thread_Body is access
 272      function (arg : System.Address) return System.Address;
 273    pragma Convention (C, Thread_Body);
 274
 275    function Thread_Body_Access is new
 276      Ada.Unchecked_Conversion (System.Address, Thread_Body);
 277
 278    type pthread_t           is private;
 279    subtype Thread_Id        is pthread_t;
 280
 281    type pthread_mutex_t     is limited private;
 282    type pthread_cond_t      is limited private;
 283    type pthread_attr_t      is limited private;
 284    type pthread_mutexattr_t is limited private;
 285    type pthread_condattr_t  is limited private;
 286    type pthread_key_t       is private;
 287
 288    PTHREAD_CREATE_DETACHED : constant := 1;
 289    PTHREAD_CREATE_JOINABLE : constant := 0;
 290
 291    PTHREAD_SCOPE_PROCESS : constant := 0;
 292    PTHREAD_SCOPE_SYSTEM  : constant := 2;
 293
 294    --  Read/Write lock not supported on DragonFly. To add support both types
 295    --  pthread_rwlock_t and pthread_rwlockattr_t must properly be defined
 296    --  with the associated routines pthread_rwlock_[init/destroy] and
 297    --  pthread_rwlock_[rdlock/wrlock/unlock].
 298
 299    subtype pthread_rwlock_t     is pthread_mutex_t;
 300    subtype pthread_rwlockattr_t is pthread_mutexattr_t;
 301
 302    -----------
 303    -- Stack --
 304    -----------
 305
 306    type stack_t is record
 307       ss_sp    : System.Address;
 308       ss_size  : size_t;
 309       ss_flags : int;
 310    end record;
 311    pragma Convention (C, stack_t);
 312
 313    function sigaltstack
 314      (ss  : not null access stack_t;
 315       oss : access stack_t) return int;
 316    pragma Import (C, sigaltstack, "sigaltstack");
 317
 318    Alternate_Stack : aliased System.Address;
 319    --  This is a dummy definition, never used (Alternate_Stack_Size is null)
 320
 321    Alternate_Stack_Size : constant := 0;
 322    --  No alternate signal stack is used on this platform
 323
 324    Stack_Base_Available : constant Boolean := False;
 325    --  Indicates whether the stack base is available on this target. This
 326    --  allows us to share s-osinte.adb between all the FSU run time. Note that
 327    --  this value can only be true if pthread_t has a complete definition that
 328    --  corresponds exactly to the C header files.
 329
 330    function Get_Stack_Base (thread : pthread_t) return Address;
 331    pragma Inline (Get_Stack_Base);
 332    --  returns the stack base of the specified thread. Only call this function
 333    --  when Stack_Base_Available is True.
 334
 335    function Get_Page_Size return int;
 336    pragma Import (C, Get_Page_Size, "getpagesize");
 337    --  Returns the size of a page
 338
 339    PROT_NONE  : constant := 0;
 340    PROT_READ  : constant := 1;
 341    PROT_WRITE : constant := 2;
 342    PROT_EXEC  : constant := 4;
 343    PROT_ALL   : constant := PROT_READ + PROT_WRITE + PROT_EXEC;
 344    PROT_ON    : constant := PROT_NONE;
 345    PROT_OFF   : constant := PROT_ALL;
 346
 347    function mprotect (addr : Address; len : size_t; prot : int) return int;
 348    pragma Import (C, mprotect);
 349
 350    ---------------------------------------
 351    -- Nonstandard Thread Initialization --
 352    ---------------------------------------
 353
 354    --  FSU_THREADS requires pthread_init, which is nonstandard and this should
 355    --  be invoked during the elaboration of s-taprop.adb.
 356
 357    --  DragonFlyBSD does not require this so we provide an empty Ada body
 358
 359    procedure pthread_init;
 360
 361    -------------------------
 362    -- POSIX.1c  Section 3 --
 363    -------------------------
 364
 365    function sigwait
 366      (set : access sigset_t;
 367       sig : access Signal) return int;
 368    pragma Import (C, sigwait, "sigwait");
 369
 370    function pthread_kill
 371      (thread : pthread_t;
 372       sig    : Signal) return int;
 373    pragma Import (C, pthread_kill, "pthread_kill");
 374
 375    function pthread_sigmask
 376      (how  : int;
 377       set  : access sigset_t;
 378       oset : access sigset_t) return int;
 379    pragma Import (C, pthread_sigmask, "pthread_sigmask");
 380
 381    --------------------------
 382    -- POSIX.1c  Section 11 --
 383    --------------------------
 384
 385    function pthread_mutexattr_init
 386      (attr : access pthread_mutexattr_t) return int;
 387    pragma Import (C, pthread_mutexattr_init, "pthread_mutexattr_init");
 388
 389    function pthread_mutexattr_destroy
 390      (attr : access pthread_mutexattr_t) return int;
 391    pragma Import (C, pthread_mutexattr_destroy, "pthread_mutexattr_destroy");
 392
 393    function pthread_mutex_init
 394      (mutex : access pthread_mutex_t;
 395       attr  : access pthread_mutexattr_t) return int;
 396    pragma Import (C, pthread_mutex_init, "pthread_mutex_init");
 397
 398    function pthread_mutex_destroy (mutex : access pthread_mutex_t) return int;
 399    pragma Import (C, pthread_mutex_destroy, "pthread_mutex_destroy");
 400
 401    function pthread_mutex_lock (mutex : access pthread_mutex_t) return int;
 402    pragma Import (C, pthread_mutex_lock, "pthread_mutex_lock");
 403
 404    function pthread_mutex_unlock (mutex : access pthread_mutex_t) return int;
 405    pragma Import (C, pthread_mutex_unlock, "pthread_mutex_unlock");
 406
 407    function pthread_condattr_init
 408      (attr : access pthread_condattr_t) return int;
 409    pragma Import (C, pthread_condattr_init, "pthread_condattr_init");
 410
 411    function pthread_condattr_destroy
 412      (attr : access pthread_condattr_t) return int;
 413    pragma Import (C, pthread_condattr_destroy, "pthread_condattr_destroy");
 414
 415    function pthread_cond_init
 416      (cond : access pthread_cond_t;
 417       attr : access pthread_condattr_t) return int;
 418    pragma Import (C, pthread_cond_init, "pthread_cond_init");
 419
 420    function pthread_cond_destroy (cond : access pthread_cond_t) return int;
 421    pragma Import (C, pthread_cond_destroy, "pthread_cond_destroy");
 422
 423    function pthread_cond_signal (cond : access pthread_cond_t) return int;
 424    pragma Import (C, pthread_cond_signal, "pthread_cond_signal");
 425
 426    function pthread_cond_wait
 427      (cond  : access pthread_cond_t;
 428       mutex : access pthread_mutex_t) return int;
 429    pragma Import (C, pthread_cond_wait, "pthread_cond_wait");
 430
 431    function pthread_cond_timedwait
 432      (cond    : access pthread_cond_t;
 433       mutex   : access pthread_mutex_t;
 434       abstime : access timespec) return int;
 435    pragma Import (C, pthread_cond_timedwait, "pthread_cond_timedwait");
 436
 437    Relative_Timed_Wait : constant Boolean := False;
 438    --  pthread_cond_timedwait requires an absolute delay time
 439
 440    --------------------------
 441    -- POSIX.1c  Section 13 --
 442    --------------------------
 443
 444    PTHREAD_PRIO_NONE    : constant := 0;
 445    PTHREAD_PRIO_PROTECT : constant := 2;
 446    PTHREAD_PRIO_INHERIT : constant := 1;
 447
 448    function pthread_mutexattr_setprotocol
 449      (attr     : access pthread_mutexattr_t;
 450       protocol : int) return int;
 451    pragma Import
 452       (C, pthread_mutexattr_setprotocol, "pthread_mutexattr_setprotocol");
 453
 454    function pthread_mutexattr_getprotocol
 455      (attr     : access pthread_mutexattr_t;
 456       protocol : access int) return int;
 457    pragma Import
 458      (C, pthread_mutexattr_getprotocol, "pthread_mutexattr_getprotocol");
 459
 460    function pthread_mutexattr_setprioceiling
 461      (attr     : access pthread_mutexattr_t;
 462       prioceiling : int) return int;
 463    pragma Import
 464      (C, pthread_mutexattr_setprioceiling,
 465       "pthread_mutexattr_setprioceiling");
 466
 467    function pthread_mutexattr_getprioceiling
 468      (attr     : access pthread_mutexattr_t;
 469       prioceiling : access int) return int;
 470    pragma Import
 471      (C, pthread_mutexattr_getprioceiling,
 472       "pthread_mutexattr_getprioceiling");
 473
 474    type struct_sched_param is record
 475       sched_priority : int;
 476    end record;
 477    pragma Convention (C, struct_sched_param);
 478
 479    function pthread_getschedparam
 480      (thread : pthread_t;
 481       policy : access int;
 482       param  : access struct_sched_param) return int;
 483    pragma Import (C, pthread_getschedparam, "pthread_getschedparam");
 484
 485    function pthread_setschedparam
 486      (thread : pthread_t;
 487       policy : int;
 488       param  : access struct_sched_param) return int;
 489    pragma Import (C, pthread_setschedparam, "pthread_setschedparam");
 490
 491    function pthread_attr_setscope
 492      (attr            : access pthread_attr_t;
 493       contentionscope : int) return int;
 494    pragma Import (C, pthread_attr_setscope, "pthread_attr_setscope");
 495
 496    function pthread_attr_getscope
 497      (attr            : access pthread_attr_t;
 498       contentionscope : access int) return int;
 499    pragma Import (C, pthread_attr_getscope, "pthread_attr_getscope");
 500
 501    function pthread_attr_setinheritsched
 502      (attr            : access pthread_attr_t;
 503       inheritsched : int) return int;
 504    pragma Import
 505      (C, pthread_attr_setinheritsched, "pthread_attr_setinheritsched");
 506
 507    function pthread_attr_getinheritsched
 508      (attr         : access pthread_attr_t;
 509       inheritsched : access int) return int;
 510    pragma Import
 511      (C, pthread_attr_getinheritsched, "pthread_attr_getinheritsched");
 512
 513    function pthread_attr_setschedpolicy
 514      (attr   : access pthread_attr_t;
 515       policy : int) return int;
 516    pragma Import (C, pthread_attr_setschedpolicy,
 517      "pthread_attr_setschedpolicy");
 518
 519    function pthread_attr_getschedpolicy
 520      (attr   : access pthread_attr_t;
 521       policy : access int) return int;
 522    pragma Import (C, pthread_attr_getschedpolicy,
 523      "pthread_attr_getschedpolicy");
 524
 525    function pthread_attr_setschedparam
 526      (attr        : access pthread_attr_t;
 527       sched_param : int) return int;
 528    pragma Import (C, pthread_attr_setschedparam, "pthread_attr_setschedparam");
 529
 530    function pthread_attr_getschedparam
 531      (attr        : access pthread_attr_t;
 532       sched_param : access int) return int;
 533    pragma Import (C, pthread_attr_getschedparam, "pthread_attr_getschedparam");
 534
 535    function sched_yield return int;
 536    pragma Import (C, sched_yield, "pthread_yield");
 537
 538    --------------------------
 539    -- P1003.1c  Section 16 --
 540    --------------------------
 541
 542    function pthread_attr_init (attributes : access pthread_attr_t) return int;
 543    pragma Import (C, pthread_attr_init, "pthread_attr_init");
 544
 545    function pthread_attr_destroy
 546      (attributes : access pthread_attr_t) return int;
 547    pragma Import (C, pthread_attr_destroy, "pthread_attr_destroy");
 548
 549    function pthread_attr_setdetachstate
 550      (attr        : access pthread_attr_t;
 551       detachstate : int) return int;
 552    pragma Import
 553      (C, pthread_attr_setdetachstate, "pthread_attr_setdetachstate");
 554
 555    function pthread_attr_getdetachstate
 556      (attr        : access pthread_attr_t;
 557       detachstate : access int) return int;
 558    pragma Import
 559      (C, pthread_attr_getdetachstate, "pthread_attr_getdetachstate");
 560
 561    function pthread_attr_getstacksize
 562      (attr      : access pthread_attr_t;
 563       stacksize : access size_t) return int;
 564    pragma Import
 565      (C, pthread_attr_getstacksize, "pthread_attr_getstacksize");
 566
 567    function pthread_attr_setstacksize
 568      (attr      : access pthread_attr_t;
 569       stacksize : size_t) return int;
 570    pragma Import
 571      (C, pthread_attr_setstacksize, "pthread_attr_setstacksize");
 572
 573    function pthread_create
 574      (thread        : access pthread_t;
 575       attributes    : access pthread_attr_t;
 576       start_routine : Thread_Body;
 577       arg           : System.Address) return int;
 578    pragma Import (C, pthread_create, "pthread_create");
 579
 580    function pthread_detach (thread : pthread_t) return int;
 581    pragma Import (C, pthread_detach, "pthread_detach");
 582
 583    procedure pthread_exit (status : System.Address);
 584    pragma Import (C, pthread_exit, "pthread_exit");
 585
 586    function pthread_self return pthread_t;
 587    pragma Import (C, pthread_self, "pthread_self");
 588
 589    --------------------------
 590    -- POSIX.1c  Section 17 --
 591    --------------------------
 592
 593    function pthread_setspecific
 594      (key   : pthread_key_t;
 595       value : System.Address) return  int;
 596    pragma Import (C, pthread_setspecific, "pthread_setspecific");
 597
 598    function pthread_getspecific (key : pthread_key_t) return System.Address;
 599    pragma Import (C, pthread_getspecific, "pthread_getspecific");
 600
 601    type destructor_pointer is access procedure (arg : System.Address);
 602    pragma Convention (C, destructor_pointer);
 603
 604    function pthread_key_create
 605      (key        : access pthread_key_t;
 606       destructor : destructor_pointer) return int;
 607    pragma Import (C, pthread_key_create, "pthread_key_create");
 608
 609    ------------------------------------
 610    -- Non-portable Pthread Functions --
 611    ------------------------------------
 612
 613    function pthread_set_name_np
 614      (thread : pthread_t;
 615       name   : System.Address) return int;
 616    pragma Import (C, pthread_set_name_np, "pthread_set_name_np");
 617
 618 private
 619
 620    type sigset_t is array (1 .. 4) of unsigned;
 621
 622    --  In DragonFlyBSD the component sa_handler turns out to
 623    --  be one a union type, and the selector is a macro:
 624    --  #define sa_handler __sigaction_u._handler
 625    --  #define sa_sigaction __sigaction_u._sigaction
 626
 627    --  Should we add a signal_context type here ???
 628    --  How could it be done independent of the CPU architecture ???
 629    --  sigcontext type is opaque, so it is architecturally neutral.
 630    --  It is always passed as an access type, so define it as an empty record
 631    --  since the contents are not used anywhere.
 632
 633    type struct_sigcontext is null record;
 634    pragma Convention (C, struct_sigcontext);
 635
 636    type pid_t is new int;
 637
 638    type time_t is range -2 ** (System.Parameters.time_t_bits - 1)
 639      .. 2 ** (System.Parameters.time_t_bits - 1) - 1;
 640
 641    type timespec is record
 642       ts_sec  : time_t;
 643       ts_nsec : long;
 644    end record;
 645    pragma Convention (C, timespec);
 646
 647    type pthread_t           is new System.Address;
 648    type pthread_attr_t      is new System.Address;
 649    type pthread_mutex_t     is new System.Address;
 650    type pthread_mutexattr_t is new System.Address;
 651    type pthread_cond_t      is new System.Address;
 652    type pthread_condattr_t  is new System.Address;
 653    type pthread_key_t       is new int;
 654
 655 end System.OS_Interface;