gcc/ada/libgnarl/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) 1991-2017, Florida State University            --
  10 --          Copyright (C) 1995-2024, 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 FreeBSD (POSIX Threads) 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.OS_Locks;
  47 with System.Parameters;
  48
  49 package System.OS_Interface is
  50    pragma Preelaborate;
  51
  52    pragma Linker_Options ("-pthread");
  53
  54    subtype int            is Interfaces.C.int;
  55    subtype short          is Interfaces.C.short;
  56    subtype long           is Interfaces.C.long;
  57    subtype unsigned       is Interfaces.C.unsigned;
  58    subtype unsigned_short is Interfaces.C.unsigned_short;
  59    subtype unsigned_long  is Interfaces.C.unsigned_long;
  60    subtype unsigned_char  is Interfaces.C.unsigned_char;
  61    subtype plain_char     is Interfaces.C.plain_char;
  62    subtype size_t         is Interfaces.C.size_t;
  63
  64    -----------
  65    -- Errno --
  66    -----------
  67
  68    function Errno return int;
  69    pragma Inline (Errno);
  70
  71    EAGAIN    : constant := 35;
  72    EINTR     : constant := 4;
  73    EINVAL    : constant := 22;
  74    ENOMEM    : constant := 12;
  75    ETIMEDOUT : constant := 60;
  76
  77    -------------
  78    -- Signals --
  79    -------------
  80
  81    Max_Interrupt : constant := 31;
  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    SIGXCPU    : constant := 24; --  CPU time limit exceeded
 111    SIGXFSZ    : constant := 25; --  filesize limit exceeded
 112    SIGVTALRM  : constant := 26; --  virtual timer expired
 113    SIGPROF    : constant := 27; --  profiling timer expired
 114    SIGWINCH   : constant := 28; --  window size change
 115    SIGINFO    : constant := 29; --  information request (NetBSD/FreeBSD)
 116    SIGUSR1    : constant := 30; --  user defined signal 1
 117    SIGUSR2    : constant := 31; --  user defined signal 2
 118
 119    SIGADAABORT : constant := SIGABRT;
 120    --  Change this if you want to use another signal for task abort.
 121    --  SIGTERM might be a good one.
 122
 123    type Signal_Set is array (Natural range <>) of Signal;
 124
 125    --  Interrupts that must be unmasked at all times.  FreeBSD
 126    --  pthreads will not allow an application to mask out any
 127    --  interrupt needed by the threads library.
 128    Unmasked : constant Signal_Set :=
 129      (SIGTRAP, SIGBUS, SIGTTIN, SIGTTOU, SIGTSTP);
 130
 131    --  FreeBSD will uses SIGPROF for timing.  Do not allow a
 132    --  handler to attach to this signal.
 133    Reserved : constant Signal_Set := (0 .. 0 => SIGPROF);
 134
 135    type sigset_t is private;
 136
 137    function sigaddset
 138      (set : access sigset_t;
 139       sig : Signal) return int;
 140    pragma Import (C, sigaddset, "sigaddset");
 141
 142    function sigdelset
 143      (set : access sigset_t;
 144       sig : Signal) return int;
 145    pragma Import (C, sigdelset, "sigdelset");
 146
 147    function sigfillset (set : access sigset_t) return int;
 148    pragma Import (C, sigfillset, "sigfillset");
 149
 150    function sigismember
 151      (set : access sigset_t;
 152       sig : Signal) return int;
 153    pragma Import (C, sigismember, "sigismember");
 154
 155    function sigemptyset (set : access sigset_t) return int;
 156    pragma Import (C, sigemptyset, "sigemptyset");
 157
 158    --  sigcontext is architecture dependent, so define it private
 159    type struct_sigcontext is private;
 160
 161    type old_struct_sigaction is record
 162       sa_handler : System.Address;
 163       sa_mask    : sigset_t;
 164       sa_flags   : int;
 165    end record;
 166    pragma Convention (C, old_struct_sigaction);
 167
 168    type new_struct_sigaction is record
 169       sa_handler : System.Address;
 170       sa_flags   : int;
 171       sa_mask    : sigset_t;
 172    end record;
 173    pragma Convention (C, new_struct_sigaction);
 174
 175    subtype struct_sigaction is new_struct_sigaction;
 176    type struct_sigaction_ptr is access all struct_sigaction;
 177
 178    SIG_BLOCK   : constant := 1;
 179    SIG_UNBLOCK : constant := 2;
 180    SIG_SETMASK : constant := 3;
 181
 182    SIG_DFL : constant := 0;
 183    SIG_IGN : constant := 1;
 184
 185    SA_SIGINFO : constant := 16#0040#;
 186    SA_ONSTACK : constant := 16#0001#;
 187
 188    function sigaction
 189      (sig  : Signal;
 190       act  : struct_sigaction_ptr;
 191       oact : struct_sigaction_ptr) return int;
 192    pragma Import (C, sigaction, "sigaction");
 193
 194    ----------
 195    -- Time --
 196    ----------
 197
 198    Time_Slice_Supported : constant Boolean := True;
 199    --  Indicates whether time slicing is supported (i.e SCHED_RR is supported)
 200
 201    type timespec is private;
 202
 203    function nanosleep (rqtp, rmtp : access timespec) return int;
 204    pragma Import (C, nanosleep, "nanosleep");
 205
 206    type clockid_t is new int;
 207
 208    function clock_getres
 209      (clock_id : clockid_t;
 210       res      : access timespec) return int;
 211    pragma Import (C, clock_getres, "clock_getres");
 212
 213    function clock_gettime
 214      (clock_id : clockid_t;
 215       tp       : access timespec)
 216       return int;
 217    pragma Import (C, clock_gettime, "clock_gettime");
 218
 219    function To_Duration (TS : timespec) return Duration;
 220    pragma Inline (To_Duration);
 221
 222    function To_Timespec (D : Duration) return timespec;
 223    pragma Inline (To_Timespec);
 224
 225    type struct_timezone is record
 226       tz_minuteswest : int;
 227       tz_dsttime     : int;
 228    end record;
 229    pragma Convention (C, struct_timezone);
 230
 231    procedure usleep (useconds : unsigned_long);
 232    pragma Import (C, usleep, "usleep");
 233
 234    -------------------------
 235    -- Priority Scheduling --
 236    -------------------------
 237
 238    SCHED_FIFO  : constant := 1;
 239    SCHED_OTHER : constant := 2;
 240    SCHED_RR    : constant := 3;
 241
 242    function To_Target_Priority
 243      (Prio : System.Any_Priority) return Interfaces.C.int;
 244    --  Maps System.Any_Priority to a POSIX priority
 245
 246    -------------
 247    -- Process --
 248    -------------
 249
 250    type pid_t is private;
 251
 252    Self_PID : constant pid_t;
 253
 254    function kill (pid : pid_t; sig : Signal) return int;
 255    pragma Import (C, kill, "kill");
 256
 257    function getpid return pid_t;
 258    pragma Import (C, getpid, "getpid");
 259
 260    ---------
 261    -- LWP --
 262    ---------
 263
 264    function lwp_self return System.Address;
 265    --  lwp_self does not exist on this thread library, revert to pthread_self
 266    --  which is the closest approximation (with getpid). This function is
 267    --  needed to share 7staprop.adb across POSIX-like targets.
 268    pragma Import (C, lwp_self, "pthread_self");
 269
 270    -------------
 271    -- Threads --
 272    -------------
 273
 274    type Thread_Body is access
 275      function (arg : System.Address) return System.Address;
 276    pragma Convention (C, Thread_Body);
 277
 278    function Thread_Body_Access is new
 279      Ada.Unchecked_Conversion (System.Address, Thread_Body);
 280
 281    type pthread_t           is private;
 282    subtype Thread_Id        is pthread_t;
 283
 284    subtype pthread_mutex_t  is System.OS_Locks.pthread_mutex_t;
 285    type pthread_cond_t      is limited private;
 286    type pthread_attr_t      is limited private;
 287    type pthread_mutexattr_t is limited private;
 288    type pthread_condattr_t  is limited private;
 289    type pthread_key_t       is private;
 290
 291    PTHREAD_CREATE_DETACHED : constant := 1;
 292    PTHREAD_CREATE_JOINABLE : constant := 0;
 293
 294    PTHREAD_SCOPE_PROCESS : constant := 0;
 295    PTHREAD_SCOPE_SYSTEM  : constant := 2;
 296
 297    --  Read/Write lock not supported on freebsd. To add support both types
 298    --  pthread_rwlock_t and pthread_rwlockattr_t must properly be defined
 299    --  with the associated routines pthread_rwlock_[init/destroy] and
 300    --  pthread_rwlock_[rdlock/wrlock/unlock].
 301
 302    subtype pthread_rwlock_t     is pthread_mutex_t;
 303    subtype pthread_rwlockattr_t is pthread_mutexattr_t;
 304
 305    -----------
 306    -- Stack --
 307    -----------
 308
 309    type stack_t is record
 310       ss_sp    : System.Address;
 311       ss_size  : size_t;
 312       ss_flags : int;
 313    end record;
 314    pragma Convention (C, stack_t);
 315
 316    function sigaltstack
 317      (ss  : not null access stack_t;
 318       oss : access stack_t) return int;
 319    pragma Import (C, sigaltstack, "sigaltstack");
 320
 321    Alternate_Stack : aliased System.Address;
 322    --  This is a dummy definition, never used (Alternate_Stack_Size is null)
 323
 324    Alternate_Stack_Size : constant := 0;
 325    --  No alternate signal stack is used on this platform
 326
 327    Stack_Base_Available : constant Boolean := False;
 328    --  Indicates whether the stack base is available on this target
 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    --  FreeBSD 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    --------------------------
 438    -- POSIX.1c  Section 13 --
 439    --------------------------
 440
 441    PTHREAD_PRIO_NONE    : constant := 0;
 442    PTHREAD_PRIO_PROTECT : constant := 2;
 443    PTHREAD_PRIO_INHERIT : constant := 1;
 444
 445    function pthread_mutexattr_setprotocol
 446      (attr     : access pthread_mutexattr_t;
 447       protocol : int) return int;
 448    pragma Import
 449       (C, pthread_mutexattr_setprotocol, "pthread_mutexattr_setprotocol");
 450
 451    function pthread_mutexattr_getprotocol
 452      (attr     : access pthread_mutexattr_t;
 453       protocol : access int) return int;
 454    pragma Import
 455      (C, pthread_mutexattr_getprotocol, "pthread_mutexattr_getprotocol");
 456
 457    function pthread_mutexattr_setprioceiling
 458      (attr     : access pthread_mutexattr_t;
 459       prioceiling : int) return int;
 460    pragma Import
 461      (C, pthread_mutexattr_setprioceiling,
 462       "pthread_mutexattr_setprioceiling");
 463
 464    function pthread_mutexattr_getprioceiling
 465      (attr     : access pthread_mutexattr_t;
 466       prioceiling : access int) return int;
 467    pragma Import
 468      (C, pthread_mutexattr_getprioceiling,
 469       "pthread_mutexattr_getprioceiling");
 470
 471    type struct_sched_param is record
 472       sched_priority : int;
 473    end record;
 474    pragma Convention (C, struct_sched_param);
 475
 476    function pthread_getschedparam
 477      (thread : pthread_t;
 478       policy : access int;
 479       param  : access struct_sched_param) return int;
 480    pragma Import (C, pthread_getschedparam, "pthread_getschedparam");
 481
 482    function pthread_setschedparam
 483      (thread : pthread_t;
 484       policy : int;
 485       param  : access struct_sched_param) return int;
 486    pragma Import (C, pthread_setschedparam, "pthread_setschedparam");
 487
 488    function pthread_attr_setscope
 489      (attr            : access pthread_attr_t;
 490       contentionscope : int) return int;
 491    pragma Import (C, pthread_attr_setscope, "pthread_attr_setscope");
 492
 493    function pthread_attr_getscope
 494      (attr            : access pthread_attr_t;
 495       contentionscope : access int) return int;
 496    pragma Import (C, pthread_attr_getscope, "pthread_attr_getscope");
 497
 498    function pthread_attr_setinheritsched
 499      (attr            : access pthread_attr_t;
 500       inheritsched : int) return int;
 501    pragma Import
 502      (C, pthread_attr_setinheritsched, "pthread_attr_setinheritsched");
 503
 504    function pthread_attr_getinheritsched
 505      (attr         : access pthread_attr_t;
 506       inheritsched : access int) return int;
 507    pragma Import
 508      (C, pthread_attr_getinheritsched, "pthread_attr_getinheritsched");
 509
 510    function pthread_attr_setschedpolicy
 511      (attr   : access pthread_attr_t;
 512       policy : int) return int;
 513    pragma Import (C, pthread_attr_setschedpolicy,
 514      "pthread_attr_setschedpolicy");
 515
 516    function pthread_attr_getschedpolicy
 517      (attr   : access pthread_attr_t;
 518       policy : access int) return int;
 519    pragma Import (C, pthread_attr_getschedpolicy,
 520      "pthread_attr_getschedpolicy");
 521
 522    function pthread_attr_setschedparam
 523      (attr        : access pthread_attr_t;
 524       sched_param : int) return int;
 525    pragma Import (C, pthread_attr_setschedparam, "pthread_attr_setschedparam");
 526
 527    function pthread_attr_getschedparam
 528      (attr        : access pthread_attr_t;
 529       sched_param : access int) return int;
 530    pragma Import (C, pthread_attr_getschedparam, "pthread_attr_getschedparam");
 531
 532    function sched_yield return int;
 533    pragma Import (C, sched_yield, "pthread_yield");
 534
 535    --------------------------
 536    -- P1003.1c  Section 16 --
 537    --------------------------
 538
 539    function pthread_attr_init (attributes : access pthread_attr_t) return int;
 540    pragma Import (C, pthread_attr_init, "pthread_attr_init");
 541
 542    function pthread_attr_destroy
 543      (attributes : access pthread_attr_t) return int;
 544    pragma Import (C, pthread_attr_destroy, "pthread_attr_destroy");
 545
 546    function pthread_attr_setdetachstate
 547      (attr        : access pthread_attr_t;
 548       detachstate : int) return int;
 549    pragma Import
 550      (C, pthread_attr_setdetachstate, "pthread_attr_setdetachstate");
 551
 552    function pthread_attr_getdetachstate
 553      (attr        : access pthread_attr_t;
 554       detachstate : access int) return int;
 555    pragma Import
 556      (C, pthread_attr_getdetachstate, "pthread_attr_getdetachstate");
 557
 558    function pthread_attr_getstacksize
 559      (attr      : access pthread_attr_t;
 560       stacksize : access size_t) return int;
 561    pragma Import
 562      (C, pthread_attr_getstacksize, "pthread_attr_getstacksize");
 563
 564    function pthread_attr_setstacksize
 565      (attr      : access pthread_attr_t;
 566       stacksize : size_t) return int;
 567    pragma Import
 568      (C, pthread_attr_setstacksize, "pthread_attr_setstacksize");
 569
 570    function pthread_create
 571      (thread        : access pthread_t;
 572       attributes    : access pthread_attr_t;
 573       start_routine : Thread_Body;
 574       arg           : System.Address) return int;
 575    pragma Import (C, pthread_create, "pthread_create");
 576
 577    function pthread_detach (thread : pthread_t) return int;
 578    pragma Import (C, pthread_detach, "pthread_detach");
 579
 580    procedure pthread_exit (status : System.Address);
 581    pragma Import (C, pthread_exit, "pthread_exit");
 582
 583    function pthread_self return pthread_t;
 584    pragma Import (C, pthread_self, "pthread_self");
 585
 586    --------------------------
 587    -- POSIX.1c  Section 17 --
 588    --------------------------
 589
 590    function pthread_setspecific
 591      (key   : pthread_key_t;
 592       value : System.Address) return  int;
 593    pragma Import (C, pthread_setspecific, "pthread_setspecific");
 594
 595    function pthread_getspecific (key : pthread_key_t) return System.Address;
 596    pragma Import (C, pthread_getspecific, "pthread_getspecific");
 597
 598    type destructor_pointer is access procedure (arg : System.Address);
 599    pragma Convention (C, destructor_pointer);
 600
 601    function pthread_key_create
 602      (key        : access pthread_key_t;
 603       destructor : destructor_pointer) return int;
 604    pragma Import (C, pthread_key_create, "pthread_key_create");
 605
 606    ------------------------------------
 607    -- Non-portable Pthread Functions --
 608    ------------------------------------
 609
 610    function pthread_set_name_np
 611      (thread : pthread_t;
 612       name   : System.Address) return int;
 613    pragma Import (C, pthread_set_name_np, "pthread_set_name_np");
 614
 615 private
 616
 617    type sigset_t is array (1 .. 4) of unsigned;
 618
 619    --  In FreeBSD the component sa_handler turns out to
 620    --  be one a union type, and the selector is a macro:
 621    --  #define sa_handler __sigaction_u._handler
 622    --  #define sa_sigaction __sigaction_u._sigaction
 623
 624    --  Should we add a signal_context type here ???
 625    --  How could it be done independent of the CPU architecture ???
 626    --  sigcontext type is opaque, so it is architecturally neutral.
 627    --  It is always passed as an access type, so define it as an empty record
 628    --  since the contents are not used anywhere.
 629
 630    type struct_sigcontext is null record;
 631    pragma Convention (C, struct_sigcontext);
 632
 633    type pid_t is new int;
 634    Self_PID : constant pid_t := 0;
 635
 636    type time_t is range -2 ** (System.Parameters.time_t_bits - 1)
 637      .. 2 ** (System.Parameters.time_t_bits - 1) - 1;
 638
 639    type timespec is record
 640       ts_sec  : time_t;
 641       ts_nsec : long;
 642    end record;
 643    pragma Convention (C, timespec);
 644
 645    type pthread_t           is new System.Address;
 646    type pthread_attr_t      is new System.Address;
 647    type pthread_mutexattr_t is new System.Address;
 648    type pthread_cond_t      is new System.Address;
 649    type pthread_condattr_t  is new System.Address;
 650    type pthread_key_t       is new int;
 651
 652 end System.OS_Interface;