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) 1995-2018, 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 ("-lpthread");
  50    pragma Linker_Options ("-lrt");
  51    --  Needed for clock_getres with glibc versions prior to 2.17
  52
  53    subtype int            is Interfaces.C.int;
  54    subtype char           is Interfaces.C.char;
  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 Import (C, errno, "__get_errno");
  70
  71    EAGAIN    : constant := System.Linux.EAGAIN;
  72    EINTR     : constant := System.Linux.EINTR;
  73    EINVAL    : constant := System.Linux.EINVAL;
  74    ENOMEM    : constant := System.Linux.ENOMEM;
  75    EPERM     : constant := System.Linux.EPERM;
  76    ETIMEDOUT : constant := System.Linux.ETIMEDOUT;
  77
  78    -------------
  79    -- Signals --
  80    -------------
  81
  82    Max_Interrupt : constant := 63;
  83    type Signal is new int range 0 .. Max_Interrupt;
  84    for Signal'Size use int'Size;
  85
  86    SIGHUP     : constant := System.Linux.SIGHUP;
  87    SIGINT     : constant := System.Linux.SIGINT;
  88    SIGQUIT    : constant := System.Linux.SIGQUIT;
  89    SIGILL     : constant := System.Linux.SIGILL;
  90    SIGTRAP    : constant := System.Linux.SIGTRAP;
  91    SIGIOT     : constant := System.Linux.SIGIOT;
  92    SIGABRT    : constant := System.Linux.SIGABRT;
  93    SIGBUS     : constant := System.Linux.SIGBUS;
  94    SIGFPE     : constant := System.Linux.SIGFPE;
  95    SIGKILL    : constant := System.Linux.SIGKILL;
  96    SIGUSR1    : constant := System.Linux.SIGUSR1;
  97    SIGSEGV    : constant := System.Linux.SIGSEGV;
  98    SIGUSR2    : constant := System.Linux.SIGUSR2;
  99    SIGPIPE    : constant := System.Linux.SIGPIPE;
 100    SIGALRM    : constant := System.Linux.SIGALRM;
 101    SIGTERM    : constant := System.Linux.SIGTERM;
 102    SIGSTKFLT  : constant := System.Linux.SIGSTKFLT;
 103    SIGCLD     : constant := System.Linux.SIGCLD;
 104    SIGCHLD    : constant := System.Linux.SIGCHLD;
 105    SIGCONT    : constant := System.Linux.SIGCONT;
 106    SIGSTOP    : constant := System.Linux.SIGSTOP;
 107    SIGTSTP    : constant := System.Linux.SIGTSTP;
 108    SIGTTIN    : constant := System.Linux.SIGTTIN;
 109    SIGTTOU    : constant := System.Linux.SIGTTOU;
 110    SIGURG     : constant := System.Linux.SIGURG;
 111    SIGXCPU    : constant := System.Linux.SIGXCPU;
 112    SIGXFSZ    : constant := System.Linux.SIGXFSZ;
 113    SIGVTALRM  : constant := System.Linux.SIGVTALRM;
 114    SIGPROF    : constant := System.Linux.SIGPROF;
 115    SIGWINCH   : constant := System.Linux.SIGWINCH;
 116    SIGPOLL    : constant := System.Linux.SIGPOLL;
 117    SIGIO      : constant := System.Linux.SIGIO;
 118    SIGLOST    : constant := System.Linux.SIGLOST;
 119    SIGPWR     : constant := System.Linux.SIGPWR;
 120    SIGSYS     : constant := System.Linux.SIGSYS;
 121    SIGUNUSED  : constant := System.Linux.SIGUNUSED;
 122    SIG32      : constant := System.Linux.SIG32;
 123    SIG33      : constant := System.Linux.SIG33;
 124    SIG34      : constant := System.Linux.SIG34;
 125
 126    SIGADAABORT : constant := SIGABRT;
 127    --  Change this to use another signal for task abort. SIGTERM might be a
 128    --  good one.
 129
 130    type Signal_Set is array (Natural range <>) of Signal;
 131
 132    Unmasked : constant Signal_Set := (
 133       SIGTRAP,
 134       --  To enable debugging on multithreaded applications, mark SIGTRAP to
 135       --  be kept unmasked.
 136
 137       SIGBUS,
 138
 139       SIGTTIN, SIGTTOU, SIGTSTP,
 140       --  Keep these three signals unmasked so that background processes and IO
 141       --  behaves as normal "C" applications
 142
 143       SIGPROF,
 144       --  To avoid confusing the profiler
 145
 146       SIGKILL, SIGSTOP
 147       --  These two signals actually can't be masked (POSIX won't allow it)
 148       );
 149
 150    Reserved : constant Signal_Set := (
 151       SIG32, SIG33, SIG34
 152       --  glibc POSIX threads implementation uses two (NPTL) or three
 153       --  (LinuxThreads) real-time signals for its own use (see SIGNAL(7)).
 154       --  These signals are considered reserved and not unmasked as glibc does
 155       --  not permit these signals to be used by the public signal.h API.
 156       --  While LinuxThreads is mostly likely unused now, SIG34 is still
 157       --  reserved as this behavior is consistent with past GNAT releases.
 158       );
 159
 160    type sigset_t is private;
 161
 162    function sigaddset (set : access sigset_t; sig : Signal) return int;
 163    pragma Import (C, sigaddset, "sigaddset");
 164
 165    function sigdelset (set : access sigset_t; sig : Signal) return int;
 166    pragma Import (C, sigdelset, "sigdelset");
 167
 168    function sigfillset (set : access sigset_t) return int;
 169    pragma Import (C, sigfillset, "sigfillset");
 170
 171    function sigismember (set : access sigset_t; sig : Signal) return int;
 172    pragma Import (C, sigismember, "sigismember");
 173
 174    function sigemptyset (set : access sigset_t) return int;
 175    pragma Import (C, sigemptyset, "sigemptyset");
 176
 177    type union_type_3 is new String (1 .. 116);
 178    type siginfo_t is record
 179       si_signo : int;
 180       si_code  : int;
 181       si_errno : int;
 182       X_data   : union_type_3;
 183    end record;
 184    pragma Convention (C, siginfo_t);
 185
 186    type struct_sigaction is record
 187       sa_handler  : System.Address;
 188       sa_mask     : sigset_t;
 189       sa_flags    : int;
 190       sa_restorer : System.Address;
 191    end record;
 192    pragma Convention (C, struct_sigaction);
 193
 194    type struct_sigaction_ptr is access all struct_sigaction;
 195
 196    type Machine_State is record
 197       eip : unsigned_long;
 198       ebx : unsigned_long;
 199       esp : unsigned_long;
 200       ebp : unsigned_long;
 201       esi : unsigned_long;
 202       edi : unsigned_long;
 203    end record;
 204    type Machine_State_Ptr is access all Machine_State;
 205
 206    SA_SIGINFO : constant := System.Linux.SA_SIGINFO;
 207    SA_ONSTACK : constant := System.Linux.SA_ONSTACK;
 208
 209    SIG_BLOCK   : constant := 0;
 210    SIG_UNBLOCK : constant := 1;
 211    SIG_SETMASK : constant := 2;
 212
 213    SIG_DFL : constant := 0;
 214    SIG_IGN : constant := 1;
 215
 216    function sigaction
 217      (sig  : Signal;
 218       act  : struct_sigaction_ptr;
 219       oact : struct_sigaction_ptr) return int;
 220    pragma Import (C, sigaction, "sigaction");
 221
 222    ----------
 223    -- Time --
 224    ----------
 225
 226    subtype time_t    is System.Linux.time_t;
 227    subtype timespec  is System.Linux.timespec;
 228    subtype timeval   is System.Linux.timeval;
 229    subtype clockid_t is System.Linux.clockid_t;
 230
 231    function clock_gettime
 232      (clock_id : clockid_t; tp : access timespec) return int;
 233    pragma Import (C, clock_gettime, "clock_gettime");
 234
 235    function clock_getres
 236      (clock_id : clockid_t;
 237       res      : access timespec) return int;
 238    pragma Import (C, clock_getres, "clock_getres");
 239
 240    function To_Duration (TS : timespec) return Duration;
 241    pragma Inline (To_Duration);
 242
 243    function To_Timespec (D : Duration) return timespec;
 244    pragma Inline (To_Timespec);
 245
 246    function sysconf (name : int) return long;
 247    pragma Import (C, sysconf);
 248
 249    SC_CLK_TCK          : constant := 2;
 250    SC_NPROCESSORS_ONLN : constant := 84;
 251
 252    -------------------------
 253    -- Priority Scheduling --
 254    -------------------------
 255
 256    SCHED_OTHER : constant := 0;
 257    SCHED_FIFO  : constant := 1;
 258    SCHED_RR    : constant := 2;
 259
 260    function To_Target_Priority
 261      (Prio : System.Any_Priority) return Interfaces.C.int;
 262    --  Maps System.Any_Priority to a POSIX priority
 263
 264    -------------
 265    -- Process --
 266    -------------
 267
 268    type pid_t is private;
 269
 270    function kill (pid : pid_t; sig : Signal) return int;
 271    pragma Import (C, kill, "kill");
 272
 273    function getpid return pid_t;
 274    pragma Import (C, getpid, "getpid");
 275
 276    PR_SET_NAME : constant := 15;
 277    PR_GET_NAME : constant := 16;
 278
 279    function prctl
 280      (option                 : int;
 281       arg2, arg3, arg4, arg5 : unsigned_long := 0) return int;
 282    pragma Import (C, prctl);
 283
 284    -------------
 285    -- Threads --
 286    -------------
 287
 288    type Thread_Body is access
 289      function (arg : System.Address) return System.Address;
 290    pragma Convention (C, Thread_Body);
 291
 292    function Thread_Body_Access is new
 293      Ada.Unchecked_Conversion (System.Address, Thread_Body);
 294
 295    type pthread_t is new unsigned_long;
 296    subtype Thread_Id is pthread_t;
 297
 298    function To_pthread_t is
 299      new Ada.Unchecked_Conversion (unsigned_long, pthread_t);
 300
 301    type pthread_mutex_t      is limited private;
 302    type pthread_rwlock_t     is limited private;
 303    type pthread_cond_t       is limited private;
 304    type pthread_attr_t       is limited private;
 305    type pthread_mutexattr_t  is limited private;
 306    type pthread_rwlockattr_t is limited private;
 307    type pthread_condattr_t   is limited private;
 308    type pthread_key_t        is private;
 309
 310    PTHREAD_CREATE_DETACHED : constant := 1;
 311
 312    -----------
 313    -- Stack --
 314    -----------
 315
 316    type stack_t is record
 317       ss_sp    : System.Address;
 318       ss_flags : int;
 319       ss_size  : size_t;
 320    end record;
 321    pragma Convention (C, stack_t);
 322
 323    function sigaltstack
 324      (ss  : not null access stack_t;
 325       oss : access stack_t) return int;
 326    pragma Import (C, sigaltstack, "sigaltstack");
 327
 328    Alternate_Stack : aliased System.Address;
 329    pragma Import (C, Alternate_Stack, "__gnat_alternate_stack");
 330    --  The alternate signal stack for stack overflows
 331
 332    Alternate_Stack_Size : constant := 16 * 1024;
 333    --  This must be in keeping with init.c:__gnat_alternate_stack
 334
 335    function Get_Stack_Base (thread : pthread_t) return Address;
 336    pragma Inline (Get_Stack_Base);
 337    --  This is a dummy procedure to share some GNULLI files
 338
 339    ---------------------------------------
 340    -- Nonstandard Thread Initialization --
 341    ---------------------------------------
 342
 343    procedure pthread_init;
 344    pragma Inline (pthread_init);
 345    --  This is a dummy procedure to share some GNULLI files
 346
 347    -------------------------
 348    -- POSIX.1c  Section 3 --
 349    -------------------------
 350
 351    function sigwait (set : access sigset_t; sig : access Signal) return int;
 352    pragma Import (C, sigwait, "sigwait");
 353
 354    function pthread_kill (thread : pthread_t; sig : Signal) return int;
 355    pragma Import (C, pthread_kill, "pthread_kill");
 356
 357    function pthread_sigmask
 358      (how  : int;
 359       set  : access sigset_t;
 360       oset : access sigset_t) return int;
 361    pragma Import (C, pthread_sigmask, "pthread_sigmask");
 362
 363    --------------------------
 364    -- POSIX.1c  Section 11 --
 365    --------------------------
 366
 367    function pthread_mutexattr_init
 368      (attr : access pthread_mutexattr_t) return int;
 369    pragma Import (C, pthread_mutexattr_init, "pthread_mutexattr_init");
 370
 371    function pthread_mutexattr_destroy
 372      (attr : access pthread_mutexattr_t) return int;
 373    pragma Import (C, pthread_mutexattr_destroy, "pthread_mutexattr_destroy");
 374
 375    function pthread_mutex_init
 376      (mutex : access pthread_mutex_t;
 377       attr  : access pthread_mutexattr_t) return int;
 378    pragma Import (C, pthread_mutex_init, "pthread_mutex_init");
 379
 380    function pthread_mutex_destroy (mutex : access pthread_mutex_t) return int;
 381    pragma Import (C, pthread_mutex_destroy, "pthread_mutex_destroy");
 382
 383    function pthread_mutex_lock (mutex : access pthread_mutex_t) return int;
 384    pragma Import (C, pthread_mutex_lock, "pthread_mutex_lock");
 385
 386    function pthread_mutex_unlock (mutex : access pthread_mutex_t) return int;
 387    pragma Import (C, pthread_mutex_unlock, "pthread_mutex_unlock");
 388
 389    function pthread_rwlockattr_init
 390      (attr : access pthread_rwlockattr_t) return int;
 391    pragma Import (C, pthread_rwlockattr_init, "pthread_rwlockattr_init");
 392
 393    function pthread_rwlockattr_destroy
 394      (attr : access pthread_rwlockattr_t) return int;
 395    pragma Import (C, pthread_rwlockattr_destroy, "pthread_rwlockattr_destroy");
 396
 397    PTHREAD_RWLOCK_PREFER_READER_NP              : constant := 0;
 398    PTHREAD_RWLOCK_PREFER_WRITER_NP              : constant := 1;
 399    PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP : constant := 2;
 400
 401    function pthread_rwlockattr_setkind_np
 402      (attr : access pthread_rwlockattr_t;
 403       pref : int) return int;
 404    pragma Import
 405      (C, pthread_rwlockattr_setkind_np, "pthread_rwlockattr_setkind_np");
 406
 407    function pthread_rwlock_init
 408      (mutex : access pthread_rwlock_t;
 409       attr  : access pthread_rwlockattr_t) return int;
 410    pragma Import (C, pthread_rwlock_init, "pthread_rwlock_init");
 411
 412    function pthread_rwlock_destroy
 413      (mutex : access pthread_rwlock_t) return int;
 414    pragma Import (C, pthread_rwlock_destroy, "pthread_rwlock_destroy");
 415
 416    function pthread_rwlock_rdlock (mutex : access pthread_rwlock_t) return int;
 417    pragma Import (C, pthread_rwlock_rdlock, "pthread_rwlock_rdlock");
 418
 419    function pthread_rwlock_wrlock (mutex : access pthread_rwlock_t) return int;
 420    pragma Import (C, pthread_rwlock_wrlock, "pthread_rwlock_wrlock");
 421
 422    function pthread_rwlock_unlock (mutex : access pthread_rwlock_t) return int;
 423    pragma Import (C, pthread_rwlock_unlock, "pthread_rwlock_unlock");
 424
 425    function pthread_condattr_init
 426      (attr : access pthread_condattr_t) return int;
 427    pragma Import (C, pthread_condattr_init, "pthread_condattr_init");
 428
 429    function pthread_condattr_destroy
 430      (attr : access pthread_condattr_t) return int;
 431    pragma Import (C, pthread_condattr_destroy, "pthread_condattr_destroy");
 432
 433    function pthread_cond_init
 434      (cond : access pthread_cond_t;
 435       attr : access pthread_condattr_t) return int;
 436    pragma Import (C, pthread_cond_init, "pthread_cond_init");
 437
 438    function pthread_cond_destroy (cond : access pthread_cond_t) return int;
 439    pragma Import (C, pthread_cond_destroy, "pthread_cond_destroy");
 440
 441    function pthread_cond_signal (cond : access pthread_cond_t) return int;
 442    pragma Import (C, pthread_cond_signal, "pthread_cond_signal");
 443
 444    function pthread_cond_wait
 445      (cond  : access pthread_cond_t;
 446       mutex : access pthread_mutex_t) return int;
 447    pragma Import (C, pthread_cond_wait, "pthread_cond_wait");
 448
 449    function pthread_cond_timedwait
 450      (cond    : access pthread_cond_t;
 451       mutex   : access pthread_mutex_t;
 452       abstime : access timespec) return int;
 453    pragma Import (C, pthread_cond_timedwait, "pthread_cond_timedwait");
 454
 455    --------------------------
 456    -- POSIX.1c  Section 13 --
 457    --------------------------
 458
 459    PTHREAD_PRIO_NONE    : constant := 0;
 460    PTHREAD_PRIO_INHERIT : constant := 1;
 461    PTHREAD_PRIO_PROTECT : constant := 2;
 462
 463    function pthread_mutexattr_setprotocol
 464      (attr     : access pthread_mutexattr_t;
 465       protocol : int) return int;
 466    pragma Import (C, pthread_mutexattr_setprotocol);
 467
 468    function pthread_mutexattr_setprioceiling
 469      (attr        : access pthread_mutexattr_t;
 470       prioceiling : int) return int;
 471    pragma Import (C, pthread_mutexattr_setprioceiling);
 472
 473    type struct_sched_param is record
 474       sched_priority : int;  --  scheduling priority
 475    end record;
 476    pragma Convention (C, struct_sched_param);
 477
 478    function pthread_setschedparam
 479      (thread : pthread_t;
 480       policy : int;
 481       param  : access struct_sched_param) return int;
 482    pragma Import (C, pthread_setschedparam, "pthread_setschedparam");
 483
 484    function pthread_attr_setschedpolicy
 485      (attr   : access pthread_attr_t;
 486       policy : int) return int;
 487    pragma Import
 488      (C, pthread_attr_setschedpolicy, "pthread_attr_setschedpolicy");
 489
 490    function sched_yield return int;
 491    pragma Import (C, sched_yield, "sched_yield");
 492
 493    ---------------------------
 494    -- P1003.1c - Section 16 --
 495    ---------------------------
 496
 497    function pthread_attr_init
 498      (attributes : access pthread_attr_t) return int;
 499    pragma Import (C, pthread_attr_init, "pthread_attr_init");
 500
 501    function pthread_attr_destroy
 502      (attributes : access pthread_attr_t) return int;
 503    pragma Import (C, pthread_attr_destroy, "pthread_attr_destroy");
 504
 505    function pthread_attr_setdetachstate
 506      (attr        : access pthread_attr_t;
 507       detachstate : int) return int;
 508    pragma Import
 509      (C, pthread_attr_setdetachstate, "pthread_attr_setdetachstate");
 510
 511    function pthread_attr_setstacksize
 512      (attr      : access pthread_attr_t;
 513       stacksize : size_t) return int;
 514    pragma Import (C, pthread_attr_setstacksize, "pthread_attr_setstacksize");
 515
 516    function pthread_create
 517      (thread        : access pthread_t;
 518       attributes    : access pthread_attr_t;
 519       start_routine : Thread_Body;
 520       arg           : System.Address) return int;
 521    pragma Import (C, pthread_create, "pthread_create");
 522
 523    procedure pthread_exit (status : System.Address);
 524    pragma Import (C, pthread_exit, "pthread_exit");
 525
 526    function pthread_self return pthread_t;
 527    pragma Import (C, pthread_self, "pthread_self");
 528
 529    function lwp_self return System.Address;
 530    pragma Import (C, lwp_self, "__gnat_lwp_self");
 531
 532    --------------------------
 533    -- POSIX.1c  Section 17 --
 534    --------------------------
 535
 536    function pthread_setspecific
 537      (key   : pthread_key_t;
 538       value : System.Address) return int;
 539    pragma Import (C, pthread_setspecific, "pthread_setspecific");
 540
 541    function pthread_getspecific (key : pthread_key_t) return System.Address;
 542    pragma Import (C, pthread_getspecific, "pthread_getspecific");
 543
 544    type destructor_pointer is access procedure (arg : System.Address);
 545    pragma Convention (C, destructor_pointer);
 546
 547    function pthread_key_create
 548      (key        : access pthread_key_t;
 549       destructor : destructor_pointer) return int;
 550    pragma Import (C, pthread_key_create, "pthread_key_create");
 551
 552    ----------------
 553    -- Extensions --
 554    ----------------
 555
 556    CPU_SETSIZE : constant := 1_024;
 557    --  Size of the cpu_set_t mask on most linux systems (SUSE 11 uses 4_096).
 558    --  This is kept for backward compatibility (System.Task_Info uses it), but
 559    --  the run-time library does no longer rely on static masks, using
 560    --  dynamically allocated masks instead.
 561
 562    type bit_field is array (1 .. CPU_SETSIZE) of Boolean;
 563    for bit_field'Size use CPU_SETSIZE;
 564    pragma Pack (bit_field);
 565    pragma Convention (C, bit_field);
 566
 567    type cpu_set_t is record
 568       bits : bit_field;
 569    end record;
 570    pragma Convention (C, cpu_set_t);
 571
 572    type cpu_set_t_ptr is access all cpu_set_t;
 573    --  In the run-time library we use this pointer because the size of type
 574    --  cpu_set_t varies depending on the glibc version. Hence, objects of type
 575    --  cpu_set_t are allocated dynamically using the number of processors
 576    --  available in the target machine (value obtained at execution time).
 577
 578    function CPU_ALLOC (count : size_t) return cpu_set_t_ptr;
 579    pragma Import (C, CPU_ALLOC, "__gnat_cpu_alloc");
 580    --  Wrapper around the CPU_ALLOC C macro
 581
 582    function CPU_ALLOC_SIZE (count : size_t) return size_t;
 583    pragma Import (C, CPU_ALLOC_SIZE, "__gnat_cpu_alloc_size");
 584    --  Wrapper around the CPU_ALLOC_SIZE C macro
 585
 586    procedure CPU_FREE (cpuset : cpu_set_t_ptr);
 587    pragma Import (C, CPU_FREE, "__gnat_cpu_free");
 588    --  Wrapper around the CPU_FREE C macro
 589
 590    procedure CPU_ZERO (count : size_t; cpuset : cpu_set_t_ptr);
 591    pragma Import (C, CPU_ZERO, "__gnat_cpu_zero");
 592    --  Wrapper around the CPU_ZERO_S C macro
 593
 594    procedure CPU_SET (cpu : int; count : size_t; cpuset : cpu_set_t_ptr);
 595    pragma Import (C, CPU_SET, "__gnat_cpu_set");
 596    --  Wrapper around the CPU_SET_S C macro
 597
 598    function pthread_setaffinity_np
 599      (thread     : pthread_t;
 600       cpusetsize : size_t;
 601       cpuset     : cpu_set_t_ptr) return int;
 602    pragma Import (C, pthread_setaffinity_np, "pthread_setaffinity_np");
 603    pragma Weak_External (pthread_setaffinity_np);
 604    --  Use a weak symbol because this function may be available or not,
 605    --  depending on the version of the system.
 606
 607    function pthread_attr_setaffinity_np
 608      (attr       : access pthread_attr_t;
 609       cpusetsize : size_t;
 610       cpuset     : cpu_set_t_ptr) return int;
 611    pragma Import (C, pthread_attr_setaffinity_np,
 612                     "pthread_attr_setaffinity_np");
 613    pragma Weak_External (pthread_attr_setaffinity_np);
 614    --  Use a weak symbol because this function may be available or not,
 615    --  depending on the version of the system.
 616
 617 private
 618
 619    type sigset_t is
 620      array (0 .. OS_Constants.SIZEOF_sigset - 1) of unsigned_char;
 621    pragma Convention (C, sigset_t);
 622    for sigset_t'Alignment use Interfaces.C.unsigned_long'Alignment;
 623
 624    pragma Warnings (Off);
 625    for struct_sigaction use record
 626       sa_handler at Linux.sa_handler_pos range 0 .. Standard'Address_Size - 1;
 627       sa_mask    at Linux.sa_mask_pos    range 0 .. 1023;
 628       sa_flags   at Linux.sa_flags_pos   range 0 .. int'Size - 1;
 629    end record;
 630    --  We intentionally leave sa_restorer unspecified and let the compiler
 631    --  append it after the last field, so disable corresponding warning.
 632    pragma Warnings (On);
 633
 634    type pid_t is new int;
 635
 636    subtype char_array is Interfaces.C.char_array;
 637
 638    type pthread_attr_t is record
 639       Data : char_array (1 .. OS_Constants.PTHREAD_ATTR_SIZE);
 640    end record;
 641    pragma Convention (C, pthread_attr_t);
 642    for pthread_attr_t'Alignment use Interfaces.C.unsigned_long'Alignment;
 643
 644    type pthread_condattr_t is record
 645       Data : char_array (1 .. OS_Constants.PTHREAD_CONDATTR_SIZE);
 646    end record;
 647    pragma Convention (C, pthread_condattr_t);
 648    for pthread_condattr_t'Alignment use Interfaces.C.int'Alignment;
 649
 650    type pthread_mutexattr_t is record
 651       Data : char_array (1 .. OS_Constants.PTHREAD_MUTEXATTR_SIZE);
 652    end  record;
 653    pragma Convention (C, pthread_mutexattr_t);
 654    for pthread_mutexattr_t'Alignment use Interfaces.C.int'Alignment;
 655
 656    type pthread_mutex_t is record
 657       Data : char_array (1 .. OS_Constants.PTHREAD_MUTEX_SIZE);
 658    end record;
 659    pragma Convention (C, pthread_mutex_t);
 660    for pthread_mutex_t'Alignment use Interfaces.C.unsigned_long'Alignment;
 661
 662    type pthread_rwlockattr_t is record
 663       Data : char_array (1 .. OS_Constants.PTHREAD_RWLOCKATTR_SIZE);
 664    end record;
 665    pragma Convention (C, pthread_rwlockattr_t);
 666    for pthread_rwlockattr_t'Alignment use Interfaces.C.unsigned_long'Alignment;
 667
 668    type pthread_rwlock_t is record
 669       Data : char_array (1 .. OS_Constants.PTHREAD_RWLOCK_SIZE);
 670    end record;
 671    pragma Convention (C, pthread_rwlock_t);
 672    for pthread_rwlock_t'Alignment use Interfaces.C.unsigned_long'Alignment;
 673
 674    type pthread_cond_t is record
 675       Data : char_array (1 .. OS_Constants.PTHREAD_COND_SIZE);
 676    end record;
 677    pragma Convention (C, pthread_cond_t);
 678    for pthread_cond_t'Alignment use Interfaces.Unsigned_64'Alignment;
 679
 680    type pthread_key_t is new unsigned;
 681
 682 end System.OS_Interface;