gcc/ada/libgnarl/s-osinte__linux.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) 1995-2019, 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 a GNU/Linux version of this package
  34
  35 --  This package encapsulates all direct interfaces to OS services
  36 --  that are needed by the tasking run-time (libgnarl).
  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 Ada.Unchecked_Conversion;
  42 with Interfaces.C;
  43 with System.Linux;
  44 with System.OS_Constants;
  45
  46 package System.OS_Interface is
  47    pragma Preelaborate;
  48
  49    pragma Linker_Options ("-lrt");
  50    --  Needed for clock_getres with glibc versions prior to 2.17
  51
  52    pragma Linker_Options ("-lpthread");
  53
  54    subtype int            is Interfaces.C.int;
  55    subtype char           is Interfaces.C.char;
  56    subtype short          is Interfaces.C.short;
  57    subtype long           is Interfaces.C.long;
  58    subtype unsigned       is Interfaces.C.unsigned;
  59    subtype unsigned_short is Interfaces.C.unsigned_short;
  60    subtype unsigned_long  is Interfaces.C.unsigned_long;
  61    subtype unsigned_char  is Interfaces.C.unsigned_char;
  62    subtype plain_char     is Interfaces.C.plain_char;
  63    subtype size_t         is Interfaces.C.size_t;
  64
  65    -----------
  66    -- Errno --
  67    -----------
  68
  69    function errno return int;
  70    pragma Import (C, errno, "__get_errno");
  71
  72    EAGAIN    : constant := System.Linux.EAGAIN;
  73    EINTR     : constant := System.Linux.EINTR;
  74    EINVAL    : constant := System.Linux.EINVAL;
  75    ENOMEM    : constant := System.Linux.ENOMEM;
  76    EPERM     : constant := System.Linux.EPERM;
  77    ETIMEDOUT : constant := System.Linux.ETIMEDOUT;
  78
  79    -------------
  80    -- Signals --
  81    -------------
  82
  83    Max_Interrupt : constant := 63;
  84    type Signal is new int range 0 .. Max_Interrupt;
  85    for Signal'Size use int'Size;
  86
  87    SIGHUP     : constant := System.Linux.SIGHUP;
  88    SIGINT     : constant := System.Linux.SIGINT;
  89    SIGQUIT    : constant := System.Linux.SIGQUIT;
  90    SIGILL     : constant := System.Linux.SIGILL;
  91    SIGTRAP    : constant := System.Linux.SIGTRAP;
  92    SIGIOT     : constant := System.Linux.SIGIOT;
  93    SIGABRT    : constant := System.Linux.SIGABRT;
  94    SIGBUS     : constant := System.Linux.SIGBUS;
  95    SIGFPE     : constant := System.Linux.SIGFPE;
  96    SIGKILL    : constant := System.Linux.SIGKILL;
  97    SIGUSR1    : constant := System.Linux.SIGUSR1;
  98    SIGSEGV    : constant := System.Linux.SIGSEGV;
  99    SIGUSR2    : constant := System.Linux.SIGUSR2;
 100    SIGPIPE    : constant := System.Linux.SIGPIPE;
 101    SIGALRM    : constant := System.Linux.SIGALRM;
 102    SIGTERM    : constant := System.Linux.SIGTERM;
 103    SIGSTKFLT  : constant := System.Linux.SIGSTKFLT;
 104    SIGCLD     : constant := System.Linux.SIGCLD;
 105    SIGCHLD    : constant := System.Linux.SIGCHLD;
 106    SIGCONT    : constant := System.Linux.SIGCONT;
 107    SIGSTOP    : constant := System.Linux.SIGSTOP;
 108    SIGTSTP    : constant := System.Linux.SIGTSTP;
 109    SIGTTIN    : constant := System.Linux.SIGTTIN;
 110    SIGTTOU    : constant := System.Linux.SIGTTOU;
 111    SIGURG     : constant := System.Linux.SIGURG;
 112    SIGXCPU    : constant := System.Linux.SIGXCPU;
 113    SIGXFSZ    : constant := System.Linux.SIGXFSZ;
 114    SIGVTALRM  : constant := System.Linux.SIGVTALRM;
 115    SIGPROF    : constant := System.Linux.SIGPROF;
 116    SIGWINCH   : constant := System.Linux.SIGWINCH;
 117    SIGPOLL    : constant := System.Linux.SIGPOLL;
 118    SIGIO      : constant := System.Linux.SIGIO;
 119    SIGLOST    : constant := System.Linux.SIGLOST;
 120    SIGPWR     : constant := System.Linux.SIGPWR;
 121    SIGSYS     : constant := System.Linux.SIGSYS;
 122    SIGUNUSED  : constant := System.Linux.SIGUNUSED;
 123    SIG32      : constant := System.Linux.SIG32;
 124    SIG33      : constant := System.Linux.SIG33;
 125    SIG34      : constant := System.Linux.SIG34;
 126
 127    SIGADAABORT : constant := SIGABRT;
 128    --  Change this to use another signal for task abort. SIGTERM might be a
 129    --  good one.
 130
 131    type Signal_Set is array (Natural range <>) of Signal;
 132
 133    Unmasked : constant Signal_Set := (
 134       SIGTRAP,
 135       --  To enable debugging on multithreaded applications, mark SIGTRAP to
 136       --  be kept unmasked.
 137
 138       SIGBUS,
 139
 140       SIGTTIN, SIGTTOU, SIGTSTP,
 141       --  Keep these three signals unmasked so that background processes and IO
 142       --  behaves as normal "C" applications
 143
 144       SIGPROF,
 145       --  To avoid confusing the profiler
 146
 147       SIGKILL, SIGSTOP
 148       --  These two signals actually can't be masked (POSIX won't allow it)
 149       );
 150
 151    Reserved : constant Signal_Set := (
 152       SIG32, SIG33, SIG34
 153       --  glibc POSIX threads implementation uses two (NPTL) or three
 154       --  (LinuxThreads) real-time signals for its own use (see SIGNAL(7)).
 155       --  These signals are considered reserved and not unmasked as glibc does
 156       --  not permit these signals to be used by the public signal.h API.
 157       --  While LinuxThreads is mostly likely unused now, SIG34 is still
 158       --  reserved as this behavior is consistent with past GNAT releases.
 159       );
 160
 161    type sigset_t is private;
 162
 163    function sigaddset (set : access sigset_t; sig : Signal) return int;
 164    pragma Import (C, sigaddset, "sigaddset");
 165
 166    function sigdelset (set : access sigset_t; sig : Signal) return int;
 167    pragma Import (C, sigdelset, "sigdelset");
 168
 169    function sigfillset (set : access sigset_t) return int;
 170    pragma Import (C, sigfillset, "sigfillset");
 171
 172    function sigismember (set : access sigset_t; sig : Signal) return int;
 173    pragma Import (C, sigismember, "sigismember");
 174
 175    function sigemptyset (set : access sigset_t) return int;
 176    pragma Import (C, sigemptyset, "sigemptyset");
 177
 178    type union_type_3 is new String (1 .. 116);
 179    type siginfo_t is record
 180       si_signo : int;
 181       si_code  : int;
 182       si_errno : int;
 183       X_data   : union_type_3;
 184    end record;
 185    pragma Convention (C, siginfo_t);
 186
 187    type struct_sigaction is record
 188       sa_handler  : System.Address;
 189       sa_mask     : sigset_t;
 190       sa_flags    : int;
 191       sa_restorer : System.Address;
 192    end record;
 193    pragma Convention (C, struct_sigaction);
 194
 195    type struct_sigaction_ptr is access all struct_sigaction;
 196
 197    type Machine_State is record
 198       eip : unsigned_long;
 199       ebx : unsigned_long;
 200       esp : unsigned_long;
 201       ebp : unsigned_long;
 202       esi : unsigned_long;
 203       edi : unsigned_long;
 204    end record;
 205    type Machine_State_Ptr is access all Machine_State;
 206
 207    SA_SIGINFO : constant := System.Linux.SA_SIGINFO;
 208    SA_ONSTACK : constant := System.Linux.SA_ONSTACK;
 209
 210    SIG_BLOCK   : constant := 0;
 211    SIG_UNBLOCK : constant := 1;
 212    SIG_SETMASK : constant := 2;
 213
 214    SIG_DFL : constant := 0;
 215    SIG_IGN : constant := 1;
 216
 217    function sigaction
 218      (sig  : Signal;
 219       act  : struct_sigaction_ptr;
 220       oact : struct_sigaction_ptr) return int;
 221    pragma Import (C, sigaction, "sigaction");
 222
 223    ----------
 224    -- Time --
 225    ----------
 226
 227    subtype time_t    is System.Linux.time_t;
 228    subtype timespec  is System.Linux.timespec;
 229    subtype timeval   is System.Linux.timeval;
 230    subtype clockid_t is System.Linux.clockid_t;
 231
 232    function clock_gettime
 233      (clock_id : clockid_t; tp : access timespec) return int;
 234    pragma Import (C, clock_gettime, "clock_gettime");
 235
 236    function clock_getres
 237      (clock_id : clockid_t;
 238       res      : access timespec) return int;
 239    pragma Import (C, clock_getres, "clock_getres");
 240
 241    function To_Duration (TS : timespec) return Duration;
 242    pragma Inline (To_Duration);
 243
 244    function To_Timespec (D : Duration) return timespec;
 245    pragma Inline (To_Timespec);
 246
 247    function sysconf (name : int) return long;
 248    pragma Import (C, sysconf);
 249
 250    SC_CLK_TCK          : constant := 2;
 251    SC_NPROCESSORS_ONLN : constant := 84;
 252
 253    -------------------------
 254    -- Priority Scheduling --
 255    -------------------------
 256
 257    SCHED_OTHER : constant := 0;
 258    SCHED_FIFO  : constant := 1;
 259    SCHED_RR    : constant := 2;
 260
 261    function To_Target_Priority
 262      (Prio : System.Any_Priority) return Interfaces.C.int;
 263    --  Maps System.Any_Priority to a POSIX priority
 264
 265    -------------
 266    -- Process --
 267    -------------
 268
 269    type pid_t is private;
 270
 271    function kill (pid : pid_t; sig : Signal) return int;
 272    pragma Import (C, kill, "kill");
 273
 274    function getpid return pid_t;
 275    pragma Import (C, getpid, "getpid");
 276
 277    PR_SET_NAME : constant := 15;
 278    PR_GET_NAME : constant := 16;
 279
 280    function prctl
 281      (option                 : int;
 282       arg2, arg3, arg4, arg5 : unsigned_long := 0) return int;
 283    pragma Import (C, prctl);
 284
 285    -------------
 286    -- Threads --
 287    -------------
 288
 289    type Thread_Body is access
 290      function (arg : System.Address) return System.Address;
 291    pragma Convention (C, Thread_Body);
 292
 293    function Thread_Body_Access is new
 294      Ada.Unchecked_Conversion (System.Address, Thread_Body);
 295
 296    type pthread_t is new unsigned_long;
 297    subtype Thread_Id is pthread_t;
 298
 299    function To_pthread_t is
 300      new Ada.Unchecked_Conversion (unsigned_long, pthread_t);
 301
 302    type pthread_mutex_t      is limited private;
 303    type pthread_rwlock_t     is limited private;
 304    type pthread_cond_t       is limited private;
 305    type pthread_attr_t       is limited private;
 306    type pthread_mutexattr_t  is limited private;
 307    type pthread_rwlockattr_t is limited private;
 308    type pthread_condattr_t   is limited private;
 309    type pthread_key_t        is private;
 310
 311    PTHREAD_CREATE_DETACHED : constant := 1;
 312
 313    -----------
 314    -- Stack --
 315    -----------
 316
 317    type stack_t is record
 318       ss_sp    : System.Address;
 319       ss_flags : int;
 320       ss_size  : size_t;
 321    end record;
 322    pragma Convention (C, stack_t);
 323
 324    function sigaltstack
 325      (ss  : not null access stack_t;
 326       oss : access stack_t) return int;
 327    pragma Import (C, sigaltstack, "sigaltstack");
 328
 329    Alternate_Stack : aliased System.Address;
 330    pragma Import (C, Alternate_Stack, "__gnat_alternate_stack");
 331    --  The alternate signal stack for stack overflows
 332
 333    Alternate_Stack_Size : constant := 16 * 1024;
 334    --  This must be in keeping with init.c:__gnat_alternate_stack
 335
 336    function Get_Stack_Base (thread : pthread_t) return Address;
 337    pragma Inline (Get_Stack_Base);
 338    --  This is a dummy procedure to share some GNULLI files
 339
 340    ---------------------------------------
 341    -- Nonstandard Thread Initialization --
 342    ---------------------------------------
 343
 344    procedure pthread_init;
 345    pragma Inline (pthread_init);
 346    --  This is a dummy procedure to share some GNULLI files
 347
 348    -------------------------
 349    -- POSIX.1c  Section 3 --
 350    -------------------------
 351
 352    function sigwait (set : access sigset_t; sig : access Signal) return int;
 353    pragma Import (C, sigwait, "sigwait");
 354
 355    function pthread_kill (thread : pthread_t; sig : Signal) return int;
 356    pragma Import (C, pthread_kill, "pthread_kill");
 357
 358    function pthread_sigmask
 359      (how  : int;
 360       set  : access sigset_t;
 361       oset : access sigset_t) return int;
 362    pragma Import (C, pthread_sigmask, "pthread_sigmask");
 363
 364    --------------------------
 365    -- POSIX.1c  Section 11 --
 366    --------------------------
 367
 368    function pthread_mutexattr_init
 369      (attr : access pthread_mutexattr_t) return int;
 370    pragma Import (C, pthread_mutexattr_init, "pthread_mutexattr_init");
 371
 372    function pthread_mutexattr_destroy
 373      (attr : access pthread_mutexattr_t) return int;
 374    pragma Import (C, pthread_mutexattr_destroy, "pthread_mutexattr_destroy");
 375
 376    function pthread_mutex_init
 377      (mutex : access pthread_mutex_t;
 378       attr  : access pthread_mutexattr_t) return int;
 379    pragma Import (C, pthread_mutex_init, "pthread_mutex_init");
 380
 381    function pthread_mutex_destroy (mutex : access pthread_mutex_t) return int;
 382    pragma Import (C, pthread_mutex_destroy, "pthread_mutex_destroy");
 383
 384    function pthread_mutex_lock (mutex : access pthread_mutex_t) return int;
 385    pragma Import (C, pthread_mutex_lock, "pthread_mutex_lock");
 386
 387    function pthread_mutex_unlock (mutex : access pthread_mutex_t) return int;
 388    pragma Import (C, pthread_mutex_unlock, "pthread_mutex_unlock");
 389
 390    function pthread_rwlockattr_init
 391      (attr : access pthread_rwlockattr_t) return int;
 392    pragma Import (C, pthread_rwlockattr_init, "pthread_rwlockattr_init");
 393
 394    function pthread_rwlockattr_destroy
 395      (attr : access pthread_rwlockattr_t) return int;
 396    pragma Import (C, pthread_rwlockattr_destroy, "pthread_rwlockattr_destroy");
 397
 398    PTHREAD_RWLOCK_PREFER_READER_NP              : constant := 0;
 399    PTHREAD_RWLOCK_PREFER_WRITER_NP              : constant := 1;
 400    PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP : constant := 2;
 401
 402    function pthread_rwlockattr_setkind_np
 403      (attr : access pthread_rwlockattr_t;
 404       pref : int) return int;
 405    pragma Import
 406      (C, pthread_rwlockattr_setkind_np, "pthread_rwlockattr_setkind_np");
 407
 408    function pthread_rwlock_init
 409      (mutex : access pthread_rwlock_t;
 410       attr  : access pthread_rwlockattr_t) return int;
 411    pragma Import (C, pthread_rwlock_init, "pthread_rwlock_init");
 412
 413    function pthread_rwlock_destroy
 414      (mutex : access pthread_rwlock_t) return int;
 415    pragma Import (C, pthread_rwlock_destroy, "pthread_rwlock_destroy");
 416
 417    function pthread_rwlock_rdlock (mutex : access pthread_rwlock_t) return int;
 418    pragma Import (C, pthread_rwlock_rdlock, "pthread_rwlock_rdlock");
 419
 420    function pthread_rwlock_wrlock (mutex : access pthread_rwlock_t) return int;
 421    pragma Import (C, pthread_rwlock_wrlock, "pthread_rwlock_wrlock");
 422
 423    function pthread_rwlock_unlock (mutex : access pthread_rwlock_t) return int;
 424    pragma Import (C, pthread_rwlock_unlock, "pthread_rwlock_unlock");
 425
 426    function pthread_condattr_init
 427      (attr : access pthread_condattr_t) return int;
 428    pragma Import (C, pthread_condattr_init, "pthread_condattr_init");
 429
 430    function pthread_condattr_destroy
 431      (attr : access pthread_condattr_t) return int;
 432    pragma Import (C, pthread_condattr_destroy, "pthread_condattr_destroy");
 433
 434    function pthread_cond_init
 435      (cond : access pthread_cond_t;
 436       attr : access pthread_condattr_t) return int;
 437    pragma Import (C, pthread_cond_init, "pthread_cond_init");
 438
 439    function pthread_cond_destroy (cond : access pthread_cond_t) return int;
 440    pragma Import (C, pthread_cond_destroy, "pthread_cond_destroy");
 441
 442    function pthread_cond_signal (cond : access pthread_cond_t) return int;
 443    pragma Import (C, pthread_cond_signal, "pthread_cond_signal");
 444
 445    function pthread_cond_wait
 446      (cond  : access pthread_cond_t;
 447       mutex : access pthread_mutex_t) return int;
 448    pragma Import (C, pthread_cond_wait, "pthread_cond_wait");
 449
 450    function pthread_cond_timedwait
 451      (cond    : access pthread_cond_t;
 452       mutex   : access pthread_mutex_t;
 453       abstime : access timespec) return int;
 454    pragma Import (C, pthread_cond_timedwait, "pthread_cond_timedwait");
 455
 456    --------------------------
 457    -- POSIX.1c  Section 13 --
 458    --------------------------
 459
 460    PTHREAD_PRIO_NONE    : constant := 0;
 461    PTHREAD_PRIO_INHERIT : constant := 1;
 462    PTHREAD_PRIO_PROTECT : constant := 2;
 463
 464    function pthread_mutexattr_setprotocol
 465      (attr     : access pthread_mutexattr_t;
 466       protocol : int) return int;
 467    pragma Import (C, pthread_mutexattr_setprotocol);
 468
 469    function pthread_mutexattr_setprioceiling
 470      (attr        : access pthread_mutexattr_t;
 471       prioceiling : int) return int;
 472    pragma Import (C, pthread_mutexattr_setprioceiling);
 473
 474    type struct_sched_param is record
 475       sched_priority : int;  --  scheduling priority
 476    end record;
 477    pragma Convention (C, struct_sched_param);
 478
 479    function pthread_setschedparam
 480      (thread : pthread_t;
 481       policy : int;
 482       param  : access struct_sched_param) return int;
 483    pragma Import (C, pthread_setschedparam, "pthread_setschedparam");
 484
 485    function pthread_attr_setschedpolicy
 486      (attr   : access pthread_attr_t;
 487       policy : int) return int;
 488    pragma Import
 489      (C, pthread_attr_setschedpolicy, "pthread_attr_setschedpolicy");
 490
 491    function sched_yield return int;
 492    pragma Import (C, sched_yield, "sched_yield");
 493
 494    ---------------------------
 495    -- P1003.1c - Section 16 --
 496    ---------------------------
 497
 498    function pthread_attr_init
 499      (attributes : access pthread_attr_t) return int;
 500    pragma Import (C, pthread_attr_init, "pthread_attr_init");
 501
 502    function pthread_attr_destroy
 503      (attributes : access pthread_attr_t) return int;
 504    pragma Import (C, pthread_attr_destroy, "pthread_attr_destroy");
 505
 506    function pthread_attr_setdetachstate
 507      (attr        : access pthread_attr_t;
 508       detachstate : int) return int;
 509    pragma Import
 510      (C, pthread_attr_setdetachstate, "pthread_attr_setdetachstate");
 511
 512    function pthread_attr_setstacksize
 513      (attr      : access pthread_attr_t;
 514       stacksize : size_t) return int;
 515    pragma Import (C, pthread_attr_setstacksize, "pthread_attr_setstacksize");
 516
 517    function pthread_create
 518      (thread        : access pthread_t;
 519       attributes    : access pthread_attr_t;
 520       start_routine : Thread_Body;
 521       arg           : System.Address) return int;
 522    pragma Import (C, pthread_create, "pthread_create");
 523
 524    procedure pthread_exit (status : System.Address);
 525    pragma Import (C, pthread_exit, "pthread_exit");
 526
 527    function pthread_self return pthread_t;
 528    pragma Import (C, pthread_self, "pthread_self");
 529
 530    function lwp_self return System.Address;
 531    pragma Import (C, lwp_self, "__gnat_lwp_self");
 532
 533    --------------------------
 534    -- POSIX.1c  Section 17 --
 535    --------------------------
 536
 537    function pthread_setspecific
 538      (key   : pthread_key_t;
 539       value : System.Address) return int;
 540    pragma Import (C, pthread_setspecific, "pthread_setspecific");
 541
 542    function pthread_getspecific (key : pthread_key_t) return System.Address;
 543    pragma Import (C, pthread_getspecific, "pthread_getspecific");
 544
 545    type destructor_pointer is access procedure (arg : System.Address);
 546    pragma Convention (C, destructor_pointer);
 547
 548    function pthread_key_create
 549      (key        : access pthread_key_t;
 550       destructor : destructor_pointer) return int;
 551    pragma Import (C, pthread_key_create, "pthread_key_create");
 552
 553    ----------------
 554    -- Extensions --
 555    ----------------
 556
 557    CPU_SETSIZE : constant := 1_024;
 558    --  Size of the cpu_set_t mask on most linux systems (SUSE 11 uses 4_096).
 559    --  This is kept for backward compatibility (System.Task_Info uses it), but
 560    --  the run-time library does no longer rely on static masks, using
 561    --  dynamically allocated masks instead.
 562
 563    type bit_field is array (1 .. CPU_SETSIZE) of Boolean;
 564    for bit_field'Size use CPU_SETSIZE;
 565    pragma Pack (bit_field);
 566    pragma Convention (C, bit_field);
 567
 568    type cpu_set_t is record
 569       bits : bit_field;
 570    end record;
 571    pragma Convention (C, cpu_set_t);
 572
 573    type cpu_set_t_ptr is access all cpu_set_t;
 574    --  In the run-time library we use this pointer because the size of type
 575    --  cpu_set_t varies depending on the glibc version. Hence, objects of type
 576    --  cpu_set_t are allocated dynamically using the number of processors
 577    --  available in the target machine (value obtained at execution time).
 578
 579    function CPU_ALLOC (count : size_t) return cpu_set_t_ptr;
 580    pragma Import (C, CPU_ALLOC, "__gnat_cpu_alloc");
 581    --  Wrapper around the CPU_ALLOC C macro
 582
 583    function CPU_ALLOC_SIZE (count : size_t) return size_t;
 584    pragma Import (C, CPU_ALLOC_SIZE, "__gnat_cpu_alloc_size");
 585    --  Wrapper around the CPU_ALLOC_SIZE C macro
 586
 587    procedure CPU_FREE (cpuset : cpu_set_t_ptr);
 588    pragma Import (C, CPU_FREE, "__gnat_cpu_free");
 589    --  Wrapper around the CPU_FREE C macro
 590
 591    procedure CPU_ZERO (count : size_t; cpuset : cpu_set_t_ptr);
 592    pragma Import (C, CPU_ZERO, "__gnat_cpu_zero");
 593    --  Wrapper around the CPU_ZERO_S C macro
 594
 595    procedure CPU_SET (cpu : int; count : size_t; cpuset : cpu_set_t_ptr);
 596    pragma Import (C, CPU_SET, "__gnat_cpu_set");
 597    --  Wrapper around the CPU_SET_S C macro
 598
 599    function pthread_setaffinity_np
 600      (thread     : pthread_t;
 601       cpusetsize : size_t;
 602       cpuset     : cpu_set_t_ptr) return int;
 603    pragma Import (C, pthread_setaffinity_np, "pthread_setaffinity_np");
 604    pragma Weak_External (pthread_setaffinity_np);
 605    --  Use a weak symbol because this function may be available or not,
 606    --  depending on the version of the system.
 607
 608    function pthread_attr_setaffinity_np
 609      (attr       : access pthread_attr_t;
 610       cpusetsize : size_t;
 611       cpuset     : cpu_set_t_ptr) return int;
 612    pragma Import (C, pthread_attr_setaffinity_np,
 613                     "pthread_attr_setaffinity_np");
 614    pragma Weak_External (pthread_attr_setaffinity_np);
 615    --  Use a weak symbol because this function may be available or not,
 616    --  depending on the version of the system.
 617
 618 private
 619
 620    type sigset_t is
 621      array (0 .. OS_Constants.SIZEOF_sigset - 1) of unsigned_char;
 622    pragma Convention (C, sigset_t);
 623    for sigset_t'Alignment use Interfaces.C.unsigned_long'Alignment;
 624
 625    pragma Warnings (Off);
 626    for struct_sigaction use record
 627       sa_handler at Linux.sa_handler_pos range 0 .. Standard'Address_Size - 1;
 628       sa_mask    at Linux.sa_mask_pos    range 0 .. 1023;
 629       sa_flags   at Linux.sa_flags_pos   range 0 .. int'Size - 1;
 630    end record;
 631    --  We intentionally leave sa_restorer unspecified and let the compiler
 632    --  append it after the last field, so disable corresponding warning.
 633    pragma Warnings (On);
 634
 635    type pid_t is new int;
 636
 637    subtype char_array is Interfaces.C.char_array;
 638
 639    type pthread_attr_t is record
 640       Data : char_array (1 .. OS_Constants.PTHREAD_ATTR_SIZE);
 641    end record;
 642    pragma Convention (C, pthread_attr_t);
 643    for pthread_attr_t'Alignment use Interfaces.C.unsigned_long'Alignment;
 644
 645    type pthread_condattr_t is record
 646       Data : char_array (1 .. OS_Constants.PTHREAD_CONDATTR_SIZE);
 647    end record;
 648    pragma Convention (C, pthread_condattr_t);
 649    for pthread_condattr_t'Alignment use Interfaces.C.int'Alignment;
 650
 651    type pthread_mutexattr_t is record
 652       Data : char_array (1 .. OS_Constants.PTHREAD_MUTEXATTR_SIZE);
 653    end  record;
 654    pragma Convention (C, pthread_mutexattr_t);
 655    for pthread_mutexattr_t'Alignment use Interfaces.C.int'Alignment;
 656
 657    type pthread_mutex_t is record
 658       Data : char_array (1 .. OS_Constants.PTHREAD_MUTEX_SIZE);
 659    end record;
 660    pragma Convention (C, pthread_mutex_t);
 661    for pthread_mutex_t'Alignment use Interfaces.C.unsigned_long'Alignment;
 662
 663    type pthread_rwlockattr_t is record
 664       Data : char_array (1 .. OS_Constants.PTHREAD_RWLOCKATTR_SIZE);
 665    end record;
 666    pragma Convention (C, pthread_rwlockattr_t);
 667    for pthread_rwlockattr_t'Alignment use Interfaces.C.unsigned_long'Alignment;
 668
 669    type pthread_rwlock_t is record
 670       Data : char_array (1 .. OS_Constants.PTHREAD_RWLOCK_SIZE);
 671    end record;
 672    pragma Convention (C, pthread_rwlock_t);
 673    for pthread_rwlock_t'Alignment use Interfaces.C.unsigned_long'Alignment;
 674
 675    type pthread_cond_t is record
 676       Data : char_array (1 .. OS_Constants.PTHREAD_COND_SIZE);
 677    end record;
 678    pragma Convention (C, pthread_cond_t);
 679    for pthread_cond_t'Alignment use Interfaces.Unsigned_64'Alignment;
 680
 681    type pthread_key_t is new unsigned;
 682
 683 end System.OS_Interface;