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) 1995-2023, 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.       --
  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    use type System.Linux.time_t;
  55
  56    subtype int            is Interfaces.C.int;
  57    subtype char           is Interfaces.C.char;
  58    subtype short          is Interfaces.C.short;
  59    subtype long           is Interfaces.C.long;
  60    subtype unsigned       is Interfaces.C.unsigned;
  61    subtype unsigned_short is Interfaces.C.unsigned_short;
  62    subtype unsigned_long  is Interfaces.C.unsigned_long;
  63    subtype unsigned_char  is Interfaces.C.unsigned_char;
  64    subtype plain_char     is Interfaces.C.plain_char;
  65    subtype size_t         is Interfaces.C.size_t;
  66
  67    -----------
  68    -- Errno --
  69    -----------
  70
  71    function errno return int;
  72    pragma Import (C, errno, "__get_errno");
  73
  74    EAGAIN    : constant := System.Linux.EAGAIN;
  75    EINTR     : constant := System.Linux.EINTR;
  76    EINVAL    : constant := System.Linux.EINVAL;
  77    ENOMEM    : constant := System.Linux.ENOMEM;
  78    EPERM     : constant := System.Linux.EPERM;
  79    ETIMEDOUT : constant := System.Linux.ETIMEDOUT;
  80
  81    -------------
  82    -- Signals --
  83    -------------
  84
  85    Max_Interrupt : constant := 63;
  86    type Signal is new int range 0 .. Max_Interrupt;
  87    for Signal'Size use int'Size;
  88
  89    SIGHUP     : constant := System.Linux.SIGHUP;
  90    SIGINT     : constant := System.Linux.SIGINT;
  91    SIGQUIT    : constant := System.Linux.SIGQUIT;
  92    SIGILL     : constant := System.Linux.SIGILL;
  93    SIGTRAP    : constant := System.Linux.SIGTRAP;
  94    SIGIOT     : constant := System.Linux.SIGIOT;
  95    SIGABRT    : constant := System.Linux.SIGABRT;
  96    SIGBUS     : constant := System.Linux.SIGBUS;
  97    SIGFPE     : constant := System.Linux.SIGFPE;
  98    SIGKILL    : constant := System.Linux.SIGKILL;
  99    SIGUSR1    : constant := System.Linux.SIGUSR1;
 100    SIGSEGV    : constant := System.Linux.SIGSEGV;
 101    SIGUSR2    : constant := System.Linux.SIGUSR2;
 102    SIGPIPE    : constant := System.Linux.SIGPIPE;
 103    SIGALRM    : constant := System.Linux.SIGALRM;
 104    SIGTERM    : constant := System.Linux.SIGTERM;
 105    SIGSTKFLT  : constant := System.Linux.SIGSTKFLT;
 106    SIGCLD     : constant := System.Linux.SIGCLD;
 107    SIGCHLD    : constant := System.Linux.SIGCHLD;
 108    SIGCONT    : constant := System.Linux.SIGCONT;
 109    SIGSTOP    : constant := System.Linux.SIGSTOP;
 110    SIGTSTP    : constant := System.Linux.SIGTSTP;
 111    SIGTTIN    : constant := System.Linux.SIGTTIN;
 112    SIGTTOU    : constant := System.Linux.SIGTTOU;
 113    SIGURG     : constant := System.Linux.SIGURG;
 114    SIGXCPU    : constant := System.Linux.SIGXCPU;
 115    SIGXFSZ    : constant := System.Linux.SIGXFSZ;
 116    SIGVTALRM  : constant := System.Linux.SIGVTALRM;
 117    SIGPROF    : constant := System.Linux.SIGPROF;
 118    SIGWINCH   : constant := System.Linux.SIGWINCH;
 119    SIGPOLL    : constant := System.Linux.SIGPOLL;
 120    SIGIO      : constant := System.Linux.SIGIO;
 121    SIGLOST    : constant := System.Linux.SIGLOST;
 122    SIGPWR     : constant := System.Linux.SIGPWR;
 123    SIGSYS     : constant := System.Linux.SIGSYS;
 124    SIGUNUSED  : constant := System.Linux.SIGUNUSED;
 125    SIG32      : constant := System.Linux.SIG32;
 126    SIG33      : constant := System.Linux.SIG33;
 127    SIG34      : constant := System.Linux.SIG34;
 128
 129    SIGADAABORT : constant := SIGABRT;
 130    --  Change this to use another signal for task abort. SIGTERM might be a
 131    --  good one.
 132
 133    type Signal_Set is array (Natural range <>) of Signal;
 134
 135    Unmasked : constant Signal_Set := [
 136       SIGTRAP,
 137       --  To enable debugging on multithreaded applications, mark SIGTRAP to
 138       --  be kept unmasked.
 139
 140       SIGBUS,
 141
 142       SIGTTIN, SIGTTOU, SIGTSTP,
 143       --  Keep these three signals unmasked so that background processes and IO
 144       --  behaves as normal "C" applications
 145
 146       SIGPROF,
 147       --  To avoid confusing the profiler
 148
 149       SIGKILL, SIGSTOP
 150       --  These two signals actually can't be masked (POSIX won't allow it)
 151       ];
 152
 153    Reserved : constant Signal_Set := [
 154       SIG32, SIG33, SIG34
 155       --  glibc POSIX threads implementation uses two (NPTL) or three
 156       --  (LinuxThreads) real-time signals for its own use (see SIGNAL(7)).
 157       --  These signals are considered reserved and not unmasked as glibc does
 158       --  not permit these signals to be used by the public signal.h API.
 159       --  While LinuxThreads is mostly likely unused now, SIG34 is still
 160       --  reserved as this behavior is consistent with past GNAT releases.
 161       ];
 162
 163    type sigset_t is private;
 164
 165    function sigaddset (set : access sigset_t; sig : Signal) return int;
 166    pragma Import (C, sigaddset, "sigaddset");
 167
 168    function sigdelset (set : access sigset_t; sig : Signal) return int;
 169    pragma Import (C, sigdelset, "sigdelset");
 170
 171    function sigfillset (set : access sigset_t) return int;
 172    pragma Import (C, sigfillset, "sigfillset");
 173
 174    function sigismember (set : access sigset_t; sig : Signal) return int;
 175    pragma Import (C, sigismember, "sigismember");
 176
 177    function sigemptyset (set : access sigset_t) return int;
 178    pragma Import (C, sigemptyset, "sigemptyset");
 179
 180    type union_type_3 is new String (1 .. 116);
 181    type siginfo_t is record
 182       si_signo : int;
 183       si_code  : int;
 184       si_errno : int;
 185       X_data   : union_type_3;
 186    end record;
 187    pragma Convention (C, siginfo_t);
 188
 189    type struct_sigaction is record
 190       sa_handler  : System.Address;
 191       sa_mask     : sigset_t;
 192       sa_flags    : int;
 193       sa_restorer : System.Address;
 194    end record;
 195    pragma Convention (C, struct_sigaction);
 196
 197    type struct_sigaction_ptr is access all struct_sigaction;
 198
 199    type Machine_State is record
 200       eip : unsigned_long;
 201       ebx : unsigned_long;
 202       esp : unsigned_long;
 203       ebp : unsigned_long;
 204       esi : unsigned_long;
 205       edi : unsigned_long;
 206    end record;
 207    type Machine_State_Ptr is access all Machine_State;
 208
 209    SA_SIGINFO : constant := System.Linux.SA_SIGINFO;
 210    SA_ONSTACK : constant := System.Linux.SA_ONSTACK;
 211
 212    SIG_BLOCK   : constant := 0;
 213    SIG_UNBLOCK : constant := 1;
 214    SIG_SETMASK : constant := 2;
 215
 216    SIG_DFL : constant := 0;
 217    SIG_IGN : constant := 1;
 218
 219    function sigaction
 220      (sig  : Signal;
 221       act  : struct_sigaction_ptr;
 222       oact : struct_sigaction_ptr) return int;
 223    pragma Import (C, sigaction, "sigaction");
 224
 225    ----------
 226    -- Time --
 227    ----------
 228
 229    subtype time_t    is System.Linux.time_t;
 230    subtype timespec  is System.Linux.timespec;
 231    subtype timeval   is System.Linux.timeval;
 232    subtype clockid_t is System.Linux.clockid_t;
 233
 234    function clock_gettime
 235      (clock_id : clockid_t; tp : access timespec) return int;
 236    pragma Import (C, clock_gettime, "clock_gettime");
 237
 238    function clock_getres
 239      (clock_id : clockid_t;
 240       res      : access timespec) return int;
 241    pragma Import (C, clock_getres, "clock_getres");
 242
 243    function To_Duration (TS : timespec) return Duration;
 244    pragma Inline (To_Duration);
 245
 246    function To_Timespec (D : Duration) return timespec;
 247    pragma Inline (To_Timespec);
 248
 249    function sysconf (name : int) return long;
 250    pragma Import (C, sysconf);
 251
 252    SC_CLK_TCK          : constant := 2;
 253    SC_NPROCESSORS_ONLN : constant := 84;
 254
 255    -------------------------
 256    -- Priority Scheduling --
 257    -------------------------
 258
 259    SCHED_OTHER : constant := 0;
 260    SCHED_FIFO  : constant := 1;
 261    SCHED_RR    : constant := 2;
 262
 263    function To_Target_Priority
 264      (Prio : System.Any_Priority) return Interfaces.C.int;
 265    --  Maps System.Any_Priority to a POSIX priority
 266
 267    -------------
 268    -- Process --
 269    -------------
 270
 271    type pid_t is private;
 272
 273    function kill (pid : pid_t; sig : Signal) return int;
 274    pragma Import (C, kill, "kill");
 275
 276    function getpid return pid_t;
 277    pragma Import (C, getpid, "getpid");
 278
 279    PR_SET_NAME : constant := 15;
 280    PR_GET_NAME : constant := 16;
 281
 282    function prctl
 283      (option : int;
 284       arg    : unsigned_long) return int;
 285    pragma Import (C_Variadic_1, prctl, "prctl");
 286
 287    -------------
 288    -- Threads --
 289    -------------
 290
 291    type Thread_Body is access
 292      function (arg : System.Address) return System.Address;
 293    pragma Convention (C, Thread_Body);
 294
 295    function Thread_Body_Access is new
 296      Ada.Unchecked_Conversion (System.Address, Thread_Body);
 297
 298    type pthread_t is new unsigned_long;
 299    subtype Thread_Id is pthread_t;
 300
 301    function To_pthread_t is
 302      new Ada.Unchecked_Conversion (unsigned_long, pthread_t);
 303
 304    type pthread_mutex_t      is limited private;
 305    type pthread_rwlock_t     is limited private;
 306    type pthread_cond_t       is limited private;
 307    type pthread_attr_t       is limited private;
 308    type pthread_mutexattr_t  is limited private;
 309    type pthread_rwlockattr_t is limited private;
 310    type pthread_condattr_t   is limited private;
 311    type pthread_key_t        is private;
 312
 313    PTHREAD_CREATE_DETACHED : constant := 1;
 314
 315    -----------
 316    -- Stack --
 317    -----------
 318
 319    subtype char_array is Interfaces.C.char_array;
 320
 321    type stack_t is record
 322       ss_sp    : System.Address;
 323       ss_flags : int;
 324       ss_size  : size_t;
 325    end record;
 326    pragma Convention (C, stack_t);
 327
 328    function sigaltstack
 329      (ss  : not null access stack_t;
 330       oss : access stack_t) return int;
 331    pragma Import (C, sigaltstack, "sigaltstack");
 332
 333    Alternate_Stack_Size : constant := 32 * 1024;
 334    --  This must be in keeping with init.c:__gnat_alternate_stack
 335
 336    Alternate_Stack : aliased char_array (1 .. Alternate_Stack_Size);
 337    pragma Import (C, Alternate_Stack, "__gnat_alternate_stack");
 338    --  The alternate signal stack for stack overflows
 339
 340    function Get_Stack_Base (thread : pthread_t) return Address;
 341    pragma Inline (Get_Stack_Base);
 342    --  This is a dummy procedure to share some GNULLI files
 343
 344    ---------------------------------------
 345    -- Nonstandard Thread Initialization --
 346    ---------------------------------------
 347
 348    procedure pthread_init;
 349    pragma Inline (pthread_init);
 350    --  This is a dummy procedure to share some GNULLI files
 351
 352    -------------------------
 353    -- POSIX.1c  Section 3 --
 354    -------------------------
 355
 356    function sigwait (set : access sigset_t; sig : access Signal) return int;
 357    pragma Import (C, sigwait, "sigwait");
 358
 359    function pthread_kill (thread : pthread_t; sig : Signal) return int;
 360    pragma Import (C, pthread_kill, "pthread_kill");
 361
 362    function pthread_sigmask
 363      (how  : int;
 364       set  : access sigset_t;
 365       oset : access sigset_t) return int;
 366    pragma Import (C, pthread_sigmask, "pthread_sigmask");
 367
 368    --------------------------
 369    -- POSIX.1c  Section 11 --
 370    --------------------------
 371
 372    function pthread_mutexattr_init
 373      (attr : access pthread_mutexattr_t) return int;
 374    pragma Import (C, pthread_mutexattr_init, "pthread_mutexattr_init");
 375
 376    function pthread_mutexattr_destroy
 377      (attr : access pthread_mutexattr_t) return int;
 378    pragma Import (C, pthread_mutexattr_destroy, "pthread_mutexattr_destroy");
 379
 380    function pthread_mutex_init
 381      (mutex : access pthread_mutex_t;
 382       attr  : access pthread_mutexattr_t) return int;
 383    pragma Import (C, pthread_mutex_init, "pthread_mutex_init");
 384
 385    function pthread_mutex_destroy (mutex : access pthread_mutex_t) return int;
 386    pragma Import (C, pthread_mutex_destroy, "pthread_mutex_destroy");
 387
 388    function pthread_mutex_lock (mutex : access pthread_mutex_t) return int;
 389    pragma Import (C, pthread_mutex_lock, "pthread_mutex_lock");
 390
 391    function pthread_mutex_unlock (mutex : access pthread_mutex_t) return int;
 392    pragma Import (C, pthread_mutex_unlock, "pthread_mutex_unlock");
 393
 394    function pthread_rwlockattr_init
 395      (attr : access pthread_rwlockattr_t) return int;
 396    pragma Import (C, pthread_rwlockattr_init, "pthread_rwlockattr_init");
 397
 398    function pthread_rwlockattr_destroy
 399      (attr : access pthread_rwlockattr_t) return int;
 400    pragma Import (C, pthread_rwlockattr_destroy, "pthread_rwlockattr_destroy");
 401
 402    PTHREAD_RWLOCK_PREFER_READER_NP              : constant := 0;
 403    PTHREAD_RWLOCK_PREFER_WRITER_NP              : constant := 1;
 404    PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP : constant := 2;
 405
 406    function pthread_rwlockattr_setkind_np
 407      (attr : access pthread_rwlockattr_t;
 408       pref : int) return int;
 409    pragma Import
 410      (C, pthread_rwlockattr_setkind_np, "pthread_rwlockattr_setkind_np");
 411
 412    function pthread_rwlock_init
 413      (mutex : access pthread_rwlock_t;
 414       attr  : access pthread_rwlockattr_t) return int;
 415    pragma Import (C, pthread_rwlock_init, "pthread_rwlock_init");
 416
 417    function pthread_rwlock_destroy
 418      (mutex : access pthread_rwlock_t) return int;
 419    pragma Import (C, pthread_rwlock_destroy, "pthread_rwlock_destroy");
 420
 421    function pthread_rwlock_rdlock (mutex : access pthread_rwlock_t) return int;
 422    pragma Import (C, pthread_rwlock_rdlock, "pthread_rwlock_rdlock");
 423
 424    function pthread_rwlock_wrlock (mutex : access pthread_rwlock_t) return int;
 425    pragma Import (C, pthread_rwlock_wrlock, "pthread_rwlock_wrlock");
 426
 427    function pthread_rwlock_unlock (mutex : access pthread_rwlock_t) return int;
 428    pragma Import (C, pthread_rwlock_unlock, "pthread_rwlock_unlock");
 429
 430    function pthread_condattr_init
 431      (attr : access pthread_condattr_t) return int;
 432    pragma Import (C, pthread_condattr_init, "pthread_condattr_init");
 433
 434    function pthread_condattr_destroy
 435      (attr : access pthread_condattr_t) return int;
 436    pragma Import (C, pthread_condattr_destroy, "pthread_condattr_destroy");
 437
 438    function pthread_cond_init
 439      (cond : access pthread_cond_t;
 440       attr : access pthread_condattr_t) return int;
 441    pragma Import (C, pthread_cond_init, "pthread_cond_init");
 442
 443    function pthread_cond_destroy (cond : access pthread_cond_t) return int;
 444    pragma Import (C, pthread_cond_destroy, "pthread_cond_destroy");
 445
 446    function pthread_cond_signal (cond : access pthread_cond_t) return int;
 447    pragma Import (C, pthread_cond_signal, "pthread_cond_signal");
 448
 449    function pthread_cond_wait
 450      (cond  : access pthread_cond_t;
 451       mutex : access pthread_mutex_t) return int;
 452    pragma Import (C, pthread_cond_wait, "pthread_cond_wait");
 453
 454    function pthread_cond_timedwait
 455      (cond    : access pthread_cond_t;
 456       mutex   : access pthread_mutex_t;
 457       abstime : access timespec) return int;
 458    pragma Import (C, pthread_cond_timedwait, "pthread_cond_timedwait");
 459
 460    --------------------------
 461    -- POSIX.1c  Section 13 --
 462    --------------------------
 463
 464    PTHREAD_PRIO_NONE    : constant := 0;
 465    PTHREAD_PRIO_INHERIT : constant := 1;
 466    PTHREAD_PRIO_PROTECT : constant := 2;
 467
 468    function pthread_mutexattr_setprotocol
 469      (attr     : access pthread_mutexattr_t;
 470       protocol : int) return int;
 471    pragma Import (C, pthread_mutexattr_setprotocol);
 472
 473    function pthread_mutexattr_setprioceiling
 474      (attr        : access pthread_mutexattr_t;
 475       prioceiling : int) return int;
 476    pragma Import (C, pthread_mutexattr_setprioceiling);
 477
 478    type struct_sched_param is record
 479       sched_priority : int;  --  scheduling priority
 480    end record;
 481    pragma Convention (C, struct_sched_param);
 482
 483    function pthread_setschedparam
 484      (thread : pthread_t;
 485       policy : int;
 486       param  : access struct_sched_param) return int;
 487    pragma Import (C, pthread_setschedparam, "pthread_setschedparam");
 488
 489    function pthread_attr_setschedpolicy
 490      (attr   : access pthread_attr_t;
 491       policy : int) return int;
 492    pragma Import
 493      (C, pthread_attr_setschedpolicy, "pthread_attr_setschedpolicy");
 494
 495    function sched_yield return int;
 496    pragma Import (C, sched_yield, "sched_yield");
 497
 498    ---------------------------
 499    -- P1003.1c - Section 16 --
 500    ---------------------------
 501
 502    function pthread_attr_init
 503      (attributes : access pthread_attr_t) return int;
 504    pragma Import (C, pthread_attr_init, "pthread_attr_init");
 505
 506    function pthread_attr_destroy
 507      (attributes : access pthread_attr_t) return int;
 508    pragma Import (C, pthread_attr_destroy, "pthread_attr_destroy");
 509
 510    function pthread_attr_setdetachstate
 511      (attr        : access pthread_attr_t;
 512       detachstate : int) return int;
 513    pragma Import
 514      (C, pthread_attr_setdetachstate, "pthread_attr_setdetachstate");
 515
 516    function pthread_attr_setstacksize
 517      (attr      : access pthread_attr_t;
 518       stacksize : size_t) return int;
 519    pragma Import (C, pthread_attr_setstacksize, "pthread_attr_setstacksize");
 520
 521    function pthread_create
 522      (thread        : access pthread_t;
 523       attributes    : access pthread_attr_t;
 524       start_routine : Thread_Body;
 525       arg           : System.Address) return int;
 526    pragma Import (C, pthread_create, "pthread_create");
 527
 528    procedure pthread_exit (status : System.Address);
 529    pragma Import (C, pthread_exit, "pthread_exit");
 530
 531    function pthread_self return pthread_t;
 532    pragma Import (C, pthread_self, "pthread_self");
 533
 534    function lwp_self return System.Address;
 535    pragma Import (C, lwp_self, "__gnat_lwp_self");
 536
 537    --------------------------
 538    -- POSIX.1c  Section 17 --
 539    --------------------------
 540
 541    function pthread_setspecific
 542      (key   : pthread_key_t;
 543       value : System.Address) return int;
 544    pragma Import (C, pthread_setspecific, "pthread_setspecific");
 545
 546    function pthread_getspecific (key : pthread_key_t) return System.Address;
 547    pragma Import (C, pthread_getspecific, "pthread_getspecific");
 548
 549    type destructor_pointer is access procedure (arg : System.Address);
 550    pragma Convention (C, destructor_pointer);
 551
 552    function pthread_key_create
 553      (key        : access pthread_key_t;
 554       destructor : destructor_pointer) return int;
 555    pragma Import (C, pthread_key_create, "pthread_key_create");
 556
 557    ----------------
 558    -- Extensions --
 559    ----------------
 560
 561    CPU_SETSIZE : constant := 1_024;
 562    --  Size of the cpu_set_t mask on most linux systems (SUSE 11 uses 4_096).
 563    --  This is kept for backward compatibility (System.Task_Info uses it), but
 564    --  the run-time library does no longer rely on static masks, using
 565    --  dynamically allocated masks instead.
 566
 567    type bit_field is array (1 .. CPU_SETSIZE) of Boolean;
 568    for bit_field'Size use CPU_SETSIZE;
 569    pragma Pack (bit_field);
 570    pragma Convention (C, bit_field);
 571
 572    type cpu_set_t is record
 573       bits : bit_field;
 574    end record;
 575    pragma Convention (C, cpu_set_t);
 576
 577    type cpu_set_t_ptr is access all cpu_set_t;
 578    --  In the run-time library we use this pointer because the size of type
 579    --  cpu_set_t varies depending on the glibc version. Hence, objects of type
 580    --  cpu_set_t are allocated dynamically using the number of processors
 581    --  available in the target machine (value obtained at execution time).
 582
 583    function CPU_ALLOC (count : size_t) return cpu_set_t_ptr;
 584    pragma Import (C, CPU_ALLOC, "__gnat_cpu_alloc");
 585    --  Wrapper around the CPU_ALLOC C macro
 586
 587    function CPU_ALLOC_SIZE (count : size_t) return size_t;
 588    pragma Import (C, CPU_ALLOC_SIZE, "__gnat_cpu_alloc_size");
 589    --  Wrapper around the CPU_ALLOC_SIZE C macro
 590
 591    procedure CPU_FREE (cpuset : cpu_set_t_ptr);
 592    pragma Import (C, CPU_FREE, "__gnat_cpu_free");
 593    --  Wrapper around the CPU_FREE C macro
 594
 595    procedure CPU_ZERO (count : size_t; cpuset : cpu_set_t_ptr);
 596    pragma Import (C, CPU_ZERO, "__gnat_cpu_zero");
 597    --  Wrapper around the CPU_ZERO_S C macro
 598
 599    procedure CPU_SET (cpu : int; count : size_t; cpuset : cpu_set_t_ptr);
 600    pragma Import (C, CPU_SET, "__gnat_cpu_set");
 601    --  Wrapper around the CPU_SET_S C macro
 602
 603    function pthread_setaffinity_np
 604      (thread     : pthread_t;
 605       cpusetsize : size_t;
 606       cpuset     : cpu_set_t_ptr) return int;
 607    pragma Import (C, pthread_setaffinity_np, "pthread_setaffinity_np");
 608    pragma Weak_External (pthread_setaffinity_np);
 609    --  Use a weak symbol because this function may be available or not,
 610    --  depending on the version of the system.
 611
 612    function pthread_attr_setaffinity_np
 613      (attr       : access pthread_attr_t;
 614       cpusetsize : size_t;
 615       cpuset     : cpu_set_t_ptr) return int;
 616    pragma Import (C, pthread_attr_setaffinity_np,
 617                     "pthread_attr_setaffinity_np");
 618    pragma Weak_External (pthread_attr_setaffinity_np);
 619    --  Use a weak symbol because this function may be available or not,
 620    --  depending on the version of the system.
 621
 622 private
 623
 624    type sigset_t is
 625      array (0 .. OS_Constants.SIZEOF_sigset - 1) of unsigned_char;
 626    pragma Convention (C, sigset_t);
 627    for sigset_t'Alignment use Interfaces.C.unsigned_long'Alignment;
 628
 629    pragma Warnings (Off);
 630    for struct_sigaction use record
 631       sa_handler at Linux.sa_handler_pos range 0 .. Standard'Address_Size - 1;
 632       sa_mask    at Linux.sa_mask_pos    range 0 .. 1023;
 633       sa_flags   at Linux.sa_flags_pos   range 0 .. int'Size - 1;
 634    end record;
 635    --  We intentionally leave sa_restorer unspecified and let the compiler
 636    --  append it after the last field, so disable corresponding warning.
 637    pragma Warnings (On);
 638
 639    type pid_t is new int;
 640
 641    type pthread_attr_t is record
 642       Data : char_array (1 .. OS_Constants.PTHREAD_ATTR_SIZE);
 643    end record;
 644    pragma Convention (C, pthread_attr_t);
 645    for pthread_attr_t'Alignment use Interfaces.C.unsigned_long'Alignment;
 646
 647    type pthread_condattr_t is record
 648       Data : char_array (1 .. OS_Constants.PTHREAD_CONDATTR_SIZE);
 649    end record;
 650    pragma Convention (C, pthread_condattr_t);
 651    for pthread_condattr_t'Alignment use Interfaces.C.int'Alignment;
 652
 653    type pthread_mutexattr_t is record
 654       Data : char_array (1 .. OS_Constants.PTHREAD_MUTEXATTR_SIZE);
 655    end record;
 656    pragma Convention (C, pthread_mutexattr_t);
 657    for pthread_mutexattr_t'Alignment use Interfaces.C.int'Alignment;
 658
 659    type pthread_mutex_t is record
 660       Data : char_array (1 .. OS_Constants.PTHREAD_MUTEX_SIZE);
 661    end record;
 662    pragma Convention (C, pthread_mutex_t);
 663    for pthread_mutex_t'Alignment use Interfaces.C.unsigned_long'Alignment;
 664
 665    type pthread_rwlockattr_t is record
 666       Data : char_array (1 .. OS_Constants.PTHREAD_RWLOCKATTR_SIZE);
 667    end record;
 668    pragma Convention (C, pthread_rwlockattr_t);
 669    for pthread_rwlockattr_t'Alignment use Interfaces.C.unsigned_long'Alignment;
 670
 671    type pthread_rwlock_t is record
 672       Data : char_array (1 .. OS_Constants.PTHREAD_RWLOCK_SIZE);
 673    end record;
 674    pragma Convention (C, pthread_rwlock_t);
 675    for pthread_rwlock_t'Alignment use Interfaces.C.unsigned_long'Alignment;
 676
 677    type pthread_cond_t is record
 678       Data : char_array (1 .. OS_Constants.PTHREAD_COND_SIZE);
 679    end record;
 680    pragma Convention (C, pthread_cond_t);
 681    for pthread_cond_t'Alignment use Interfaces.Unsigned_64'Alignment;
 682
 683    type pthread_key_t is new unsigned;
 684
 685 end System.OS_Interface;