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 (GNU/LinuxThreads) 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    SIGFPE     : constant := System.Linux.SIGFPE;
  94    SIGKILL    : constant := System.Linux.SIGKILL;
  95    SIGBUS     : constant := System.Linux.SIGBUS;
  96    SIGSEGV    : constant := System.Linux.SIGSEGV;
  97    SIGPIPE    : constant := System.Linux.SIGPIPE;
  98    SIGALRM    : constant := System.Linux.SIGALRM;
  99    SIGTERM    : constant := System.Linux.SIGTERM;
 100    SIGUSR1    : constant := System.Linux.SIGUSR1;
 101    SIGUSR2    : constant := System.Linux.SIGUSR2;
 102    SIGCLD     : constant := System.Linux.SIGCLD;
 103    SIGCHLD    : constant := System.Linux.SIGCHLD;
 104    SIGPWR     : constant := System.Linux.SIGPWR;
 105    SIGWINCH   : constant := System.Linux.SIGWINCH;
 106    SIGURG     : constant := System.Linux.SIGURG;
 107    SIGPOLL    : constant := System.Linux.SIGPOLL;
 108    SIGIO      : constant := System.Linux.SIGIO;
 109    SIGLOST    : constant := System.Linux.SIGLOST;
 110    SIGSTOP    : constant := System.Linux.SIGSTOP;
 111    SIGTSTP    : constant := System.Linux.SIGTSTP;
 112    SIGCONT    : constant := System.Linux.SIGCONT;
 113    SIGTTIN    : constant := System.Linux.SIGTTIN;
 114    SIGTTOU    : constant := System.Linux.SIGTTOU;
 115    SIGVTALRM  : constant := System.Linux.SIGVTALRM;
 116    SIGPROF    : constant := System.Linux.SIGPROF;
 117    SIGXCPU    : constant := System.Linux.SIGXCPU;
 118    SIGXFSZ    : constant := System.Linux.SIGXFSZ;
 119    SIGUNUSED  : constant := System.Linux.SIGUNUSED;
 120    SIGSTKFLT  : constant := System.Linux.SIGSTKFLT;
 121    SIGLTHRRES : constant := System.Linux.SIGLTHRRES;
 122    SIGLTHRCAN : constant := System.Linux.SIGLTHRCAN;
 123    SIGLTHRDBG : constant := System.Linux.SIGLTHRDBG;
 124
 125    SIGADAABORT : constant := SIGABRT;
 126    --  Change this to use another signal for task abort. SIGTERM might be a
 127    --  good one.
 128
 129    type Signal_Set is array (Natural range <>) of Signal;
 130
 131    Unmasked : constant Signal_Set := (
 132       SIGTRAP,
 133       --  To enable debugging on multithreaded applications, mark SIGTRAP to
 134       --  be kept unmasked.
 135
 136       SIGBUS,
 137
 138       SIGTTIN, SIGTTOU, SIGTSTP,
 139       --  Keep these three signals unmasked so that background processes and IO
 140       --  behaves as normal "C" applications
 141
 142       SIGPROF,
 143       --  To avoid confusing the profiler
 144
 145       SIGKILL, SIGSTOP,
 146       --  These two signals actually can't be masked (POSIX won't allow it)
 147
 148       SIGLTHRRES, SIGLTHRCAN, SIGLTHRDBG);
 149       --  These three signals are used by GNU/LinuxThreads starting from glibc
 150       --  2.1 (future 2.2).
 151
 152    Reserved : constant Signal_Set := (SIGVTALRM, SIGUNUSED);
 153    --  Not clear why these two signals are reserved. Perhaps they are not
 154    --  supported by this version of GNU/Linux ???
 155
 156    type sigset_t is private;
 157
 158    function sigaddset (set : access sigset_t; sig : Signal) return int;
 159    pragma Import (C, sigaddset, "sigaddset");
 160
 161    function sigdelset (set : access sigset_t; sig : Signal) return int;
 162    pragma Import (C, sigdelset, "sigdelset");
 163
 164    function sigfillset (set : access sigset_t) return int;
 165    pragma Import (C, sigfillset, "sigfillset");
 166
 167    function sigismember (set : access sigset_t; sig : Signal) return int;
 168    pragma Import (C, sigismember, "sigismember");
 169
 170    function sigemptyset (set : access sigset_t) return int;
 171    pragma Import (C, sigemptyset, "sigemptyset");
 172
 173    type union_type_3 is new String (1 .. 116);
 174    type siginfo_t is record
 175       si_signo : int;
 176       si_code  : int;
 177       si_errno : int;
 178       X_data   : union_type_3;
 179    end record;
 180    pragma Convention (C, siginfo_t);
 181
 182    type struct_sigaction is record
 183       sa_handler  : System.Address;
 184       sa_mask     : sigset_t;
 185       sa_flags    : int;
 186       sa_restorer : System.Address;
 187    end record;
 188    pragma Convention (C, struct_sigaction);
 189
 190    type struct_sigaction_ptr is access all struct_sigaction;
 191
 192    type Machine_State is record
 193       eip : unsigned_long;
 194       ebx : unsigned_long;
 195       esp : unsigned_long;
 196       ebp : unsigned_long;
 197       esi : unsigned_long;
 198       edi : unsigned_long;
 199    end record;
 200    type Machine_State_Ptr is access all Machine_State;
 201
 202    SA_SIGINFO : constant := System.Linux.SA_SIGINFO;
 203    SA_ONSTACK : constant := System.Linux.SA_ONSTACK;
 204
 205    SIG_BLOCK   : constant := 0;
 206    SIG_UNBLOCK : constant := 1;
 207    SIG_SETMASK : constant := 2;
 208
 209    SIG_DFL : constant := 0;
 210    SIG_IGN : constant := 1;
 211
 212    function sigaction
 213      (sig  : Signal;
 214       act  : struct_sigaction_ptr;
 215       oact : struct_sigaction_ptr) return int;
 216    pragma Import (C, sigaction, "sigaction");
 217
 218    ----------
 219    -- Time --
 220    ----------
 221
 222    subtype time_t    is System.Linux.time_t;
 223    subtype timespec  is System.Linux.timespec;
 224    subtype timeval   is System.Linux.timeval;
 225    subtype clockid_t is System.Linux.clockid_t;
 226
 227    function clock_gettime
 228      (clock_id : clockid_t; tp : access timespec) return int;
 229    pragma Import (C, clock_gettime, "clock_gettime");
 230
 231    function clock_getres
 232      (clock_id : clockid_t;
 233       res      : access timespec) return int;
 234    pragma Import (C, clock_getres, "clock_getres");
 235
 236    function To_Duration (TS : timespec) return Duration;
 237    pragma Inline (To_Duration);
 238
 239    function To_Timespec (D : Duration) return timespec;
 240    pragma Inline (To_Timespec);
 241
 242    function sysconf (name : int) return long;
 243    pragma Import (C, sysconf);
 244
 245    SC_CLK_TCK          : constant := 2;
 246    SC_NPROCESSORS_ONLN : constant := 84;
 247
 248    -------------------------
 249    -- Priority Scheduling --
 250    -------------------------
 251
 252    SCHED_OTHER : constant := 0;
 253    SCHED_FIFO  : constant := 1;
 254    SCHED_RR    : constant := 2;
 255
 256    function To_Target_Priority
 257      (Prio : System.Any_Priority) return Interfaces.C.int;
 258    --  Maps System.Any_Priority to a POSIX priority
 259
 260    -------------
 261    -- Process --
 262    -------------
 263
 264    type pid_t is private;
 265
 266    function kill (pid : pid_t; sig : Signal) return int;
 267    pragma Import (C, kill, "kill");
 268
 269    function getpid return pid_t;
 270    pragma Import (C, getpid, "getpid");
 271
 272    PR_SET_NAME : constant := 15;
 273    PR_GET_NAME : constant := 16;
 274
 275    function prctl
 276      (option                 : int;
 277       arg2, arg3, arg4, arg5 : unsigned_long := 0) return int;
 278    pragma Import (C, prctl);
 279
 280    -------------
 281    -- Threads --
 282    -------------
 283
 284    type Thread_Body is access
 285      function (arg : System.Address) return System.Address;
 286    pragma Convention (C, Thread_Body);
 287
 288    function Thread_Body_Access is new
 289      Ada.Unchecked_Conversion (System.Address, Thread_Body);
 290
 291    type pthread_t is new unsigned_long;
 292    subtype Thread_Id is pthread_t;
 293
 294    function To_pthread_t is
 295      new Ada.Unchecked_Conversion (unsigned_long, pthread_t);
 296
 297    type pthread_mutex_t      is limited private;
 298    type pthread_rwlock_t     is limited private;
 299    type pthread_cond_t       is limited private;
 300    type pthread_attr_t       is limited private;
 301    type pthread_mutexattr_t  is limited private;
 302    type pthread_rwlockattr_t is limited private;
 303    type pthread_condattr_t   is limited private;
 304    type pthread_key_t        is private;
 305
 306    PTHREAD_CREATE_DETACHED : constant := 1;
 307
 308    -----------
 309    -- Stack --
 310    -----------
 311
 312    type stack_t is record
 313       ss_sp    : System.Address;
 314       ss_flags : int;
 315       ss_size  : size_t;
 316    end record;
 317    pragma Convention (C, stack_t);
 318
 319    function sigaltstack
 320      (ss  : not null access stack_t;
 321       oss : access stack_t) return int;
 322    pragma Import (C, sigaltstack, "sigaltstack");
 323
 324    Alternate_Stack : aliased System.Address;
 325    pragma Import (C, Alternate_Stack, "__gnat_alternate_stack");
 326    --  The alternate signal stack for stack overflows
 327
 328    Alternate_Stack_Size : constant := 16 * 1024;
 329    --  This must be in keeping with init.c:__gnat_alternate_stack
 330
 331    function Get_Stack_Base (thread : pthread_t) return Address;
 332    pragma Inline (Get_Stack_Base);
 333    --  This is a dummy procedure to share some GNULLI files
 334
 335    ---------------------------------------
 336    -- Nonstandard Thread Initialization --
 337    ---------------------------------------
 338
 339    procedure pthread_init;
 340    pragma Inline (pthread_init);
 341    --  This is a dummy procedure to share some GNULLI files
 342
 343    -------------------------
 344    -- POSIX.1c  Section 3 --
 345    -------------------------
 346
 347    function sigwait (set : access sigset_t; sig : access Signal) return int;
 348    pragma Import (C, sigwait, "sigwait");
 349
 350    function pthread_kill (thread : pthread_t; sig : Signal) return int;
 351    pragma Import (C, pthread_kill, "pthread_kill");
 352
 353    function pthread_sigmask
 354      (how  : int;
 355       set  : access sigset_t;
 356       oset : access sigset_t) return int;
 357    pragma Import (C, pthread_sigmask, "pthread_sigmask");
 358
 359    --------------------------
 360    -- POSIX.1c  Section 11 --
 361    --------------------------
 362
 363    function pthread_mutexattr_init
 364      (attr : access pthread_mutexattr_t) return int;
 365    pragma Import (C, pthread_mutexattr_init, "pthread_mutexattr_init");
 366
 367    function pthread_mutexattr_destroy
 368      (attr : access pthread_mutexattr_t) return int;
 369    pragma Import (C, pthread_mutexattr_destroy, "pthread_mutexattr_destroy");
 370
 371    function pthread_mutex_init
 372      (mutex : access pthread_mutex_t;
 373       attr  : access pthread_mutexattr_t) return int;
 374    pragma Import (C, pthread_mutex_init, "pthread_mutex_init");
 375
 376    function pthread_mutex_destroy (mutex : access pthread_mutex_t) return int;
 377    pragma Import (C, pthread_mutex_destroy, "pthread_mutex_destroy");
 378
 379    function pthread_mutex_lock (mutex : access pthread_mutex_t) return int;
 380    pragma Import (C, pthread_mutex_lock, "pthread_mutex_lock");
 381
 382    function pthread_mutex_unlock (mutex : access pthread_mutex_t) return int;
 383    pragma Import (C, pthread_mutex_unlock, "pthread_mutex_unlock");
 384
 385    function pthread_rwlockattr_init
 386      (attr : access pthread_rwlockattr_t) return int;
 387    pragma Import (C, pthread_rwlockattr_init, "pthread_rwlockattr_init");
 388
 389    function pthread_rwlockattr_destroy
 390      (attr : access pthread_rwlockattr_t) return int;
 391    pragma Import (C, pthread_rwlockattr_destroy, "pthread_rwlockattr_destroy");
 392
 393    PTHREAD_RWLOCK_PREFER_READER_NP              : constant := 0;
 394    PTHREAD_RWLOCK_PREFER_WRITER_NP              : constant := 1;
 395    PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP : constant := 2;
 396
 397    function pthread_rwlockattr_setkind_np
 398      (attr : access pthread_rwlockattr_t;
 399       pref : int) return int;
 400    pragma Import
 401      (C, pthread_rwlockattr_setkind_np, "pthread_rwlockattr_setkind_np");
 402
 403    function pthread_rwlock_init
 404      (mutex : access pthread_rwlock_t;
 405       attr  : access pthread_rwlockattr_t) return int;
 406    pragma Import (C, pthread_rwlock_init, "pthread_rwlock_init");
 407
 408    function pthread_rwlock_destroy
 409      (mutex : access pthread_rwlock_t) return int;
 410    pragma Import (C, pthread_rwlock_destroy, "pthread_rwlock_destroy");
 411
 412    function pthread_rwlock_rdlock (mutex : access pthread_rwlock_t) return int;
 413    pragma Import (C, pthread_rwlock_rdlock, "pthread_rwlock_rdlock");
 414
 415    function pthread_rwlock_wrlock (mutex : access pthread_rwlock_t) return int;
 416    pragma Import (C, pthread_rwlock_wrlock, "pthread_rwlock_wrlock");
 417
 418    function pthread_rwlock_unlock (mutex : access pthread_rwlock_t) return int;
 419    pragma Import (C, pthread_rwlock_unlock, "pthread_rwlock_unlock");
 420
 421    function pthread_condattr_init
 422      (attr : access pthread_condattr_t) return int;
 423    pragma Import (C, pthread_condattr_init, "pthread_condattr_init");
 424
 425    function pthread_condattr_destroy
 426      (attr : access pthread_condattr_t) return int;
 427    pragma Import (C, pthread_condattr_destroy, "pthread_condattr_destroy");
 428
 429    function pthread_cond_init
 430      (cond : access pthread_cond_t;
 431       attr : access pthread_condattr_t) return int;
 432    pragma Import (C, pthread_cond_init, "pthread_cond_init");
 433
 434    function pthread_cond_destroy (cond : access pthread_cond_t) return int;
 435    pragma Import (C, pthread_cond_destroy, "pthread_cond_destroy");
 436
 437    function pthread_cond_signal (cond : access pthread_cond_t) return int;
 438    pragma Import (C, pthread_cond_signal, "pthread_cond_signal");
 439
 440    function pthread_cond_wait
 441      (cond  : access pthread_cond_t;
 442       mutex : access pthread_mutex_t) return int;
 443    pragma Import (C, pthread_cond_wait, "pthread_cond_wait");
 444
 445    function pthread_cond_timedwait
 446      (cond    : access pthread_cond_t;
 447       mutex   : access pthread_mutex_t;
 448       abstime : access timespec) return int;
 449    pragma Import (C, pthread_cond_timedwait, "pthread_cond_timedwait");
 450
 451    --------------------------
 452    -- POSIX.1c  Section 13 --
 453    --------------------------
 454
 455    PTHREAD_PRIO_NONE    : constant := 0;
 456    PTHREAD_PRIO_INHERIT : constant := 1;
 457    PTHREAD_PRIO_PROTECT : constant := 2;
 458
 459    function pthread_mutexattr_setprotocol
 460      (attr     : access pthread_mutexattr_t;
 461       protocol : int) return int;
 462    pragma Import (C, pthread_mutexattr_setprotocol);
 463
 464    function pthread_mutexattr_setprioceiling
 465      (attr        : access pthread_mutexattr_t;
 466       prioceiling : int) return int;
 467    pragma Import (C, pthread_mutexattr_setprioceiling);
 468
 469    type struct_sched_param is record
 470       sched_priority : int;  --  scheduling priority
 471    end record;
 472    pragma Convention (C, struct_sched_param);
 473
 474    function pthread_setschedparam
 475      (thread : pthread_t;
 476       policy : int;
 477       param  : access struct_sched_param) return int;
 478    pragma Import (C, pthread_setschedparam, "pthread_setschedparam");
 479
 480    function pthread_attr_setschedpolicy
 481      (attr   : access pthread_attr_t;
 482       policy : int) return int;
 483    pragma Import
 484      (C, pthread_attr_setschedpolicy, "pthread_attr_setschedpolicy");
 485
 486    function sched_yield return int;
 487    pragma Import (C, sched_yield, "sched_yield");
 488
 489    ---------------------------
 490    -- P1003.1c - Section 16 --
 491    ---------------------------
 492
 493    function pthread_attr_init
 494      (attributes : access pthread_attr_t) return int;
 495    pragma Import (C, pthread_attr_init, "pthread_attr_init");
 496
 497    function pthread_attr_destroy
 498      (attributes : access pthread_attr_t) return int;
 499    pragma Import (C, pthread_attr_destroy, "pthread_attr_destroy");
 500
 501    function pthread_attr_setdetachstate
 502      (attr        : access pthread_attr_t;
 503       detachstate : int) return int;
 504    pragma Import
 505      (C, pthread_attr_setdetachstate, "pthread_attr_setdetachstate");
 506
 507    function pthread_attr_setstacksize
 508      (attr      : access pthread_attr_t;
 509       stacksize : size_t) return int;
 510    pragma Import (C, pthread_attr_setstacksize, "pthread_attr_setstacksize");
 511
 512    function pthread_create
 513      (thread        : access pthread_t;
 514       attributes    : access pthread_attr_t;
 515       start_routine : Thread_Body;
 516       arg           : System.Address) return int;
 517    pragma Import (C, pthread_create, "pthread_create");
 518
 519    procedure pthread_exit (status : System.Address);
 520    pragma Import (C, pthread_exit, "pthread_exit");
 521
 522    function pthread_self return pthread_t;
 523    pragma Import (C, pthread_self, "pthread_self");
 524
 525    function lwp_self return System.Address;
 526    pragma Import (C, lwp_self, "__gnat_lwp_self");
 527
 528    --------------------------
 529    -- POSIX.1c  Section 17 --
 530    --------------------------
 531
 532    function pthread_setspecific
 533      (key   : pthread_key_t;
 534       value : System.Address) return int;
 535    pragma Import (C, pthread_setspecific, "pthread_setspecific");
 536
 537    function pthread_getspecific (key : pthread_key_t) return System.Address;
 538    pragma Import (C, pthread_getspecific, "pthread_getspecific");
 539
 540    type destructor_pointer is access procedure (arg : System.Address);
 541    pragma Convention (C, destructor_pointer);
 542
 543    function pthread_key_create
 544      (key        : access pthread_key_t;
 545       destructor : destructor_pointer) return int;
 546    pragma Import (C, pthread_key_create, "pthread_key_create");
 547
 548    ----------------
 549    -- Extensions --
 550    ----------------
 551
 552    CPU_SETSIZE : constant := 1_024;
 553    --  Size of the cpu_set_t mask on most linux systems (SUSE 11 uses 4_096).
 554    --  This is kept for backward compatibility (System.Task_Info uses it), but
 555    --  the run-time library does no longer rely on static masks, using
 556    --  dynamically allocated masks instead.
 557
 558    type bit_field is array (1 .. CPU_SETSIZE) of Boolean;
 559    for bit_field'Size use CPU_SETSIZE;
 560    pragma Pack (bit_field);
 561    pragma Convention (C, bit_field);
 562
 563    type cpu_set_t is record
 564       bits : bit_field;
 565    end record;
 566    pragma Convention (C, cpu_set_t);
 567
 568    type cpu_set_t_ptr is access all cpu_set_t;
 569    --  In the run-time library we use this pointer because the size of type
 570    --  cpu_set_t varies depending on the glibc version. Hence, objects of type
 571    --  cpu_set_t are allocated dynamically using the number of processors
 572    --  available in the target machine (value obtained at execution time).
 573
 574    function CPU_ALLOC (count : size_t) return cpu_set_t_ptr;
 575    pragma Import (C, CPU_ALLOC, "__gnat_cpu_alloc");
 576    --  Wrapper around the CPU_ALLOC C macro
 577
 578    function CPU_ALLOC_SIZE (count : size_t) return size_t;
 579    pragma Import (C, CPU_ALLOC_SIZE, "__gnat_cpu_alloc_size");
 580    --  Wrapper around the CPU_ALLOC_SIZE C macro
 581
 582    procedure CPU_FREE (cpuset : cpu_set_t_ptr);
 583    pragma Import (C, CPU_FREE, "__gnat_cpu_free");
 584    --  Wrapper around the CPU_FREE C macro
 585
 586    procedure CPU_ZERO (count : size_t; cpuset : cpu_set_t_ptr);
 587    pragma Import (C, CPU_ZERO, "__gnat_cpu_zero");
 588    --  Wrapper around the CPU_ZERO_S C macro
 589
 590    procedure CPU_SET (cpu : int; count : size_t; cpuset : cpu_set_t_ptr);
 591    pragma Import (C, CPU_SET, "__gnat_cpu_set");
 592    --  Wrapper around the CPU_SET_S C macro
 593
 594    function pthread_setaffinity_np
 595      (thread     : pthread_t;
 596       cpusetsize : size_t;
 597       cpuset     : cpu_set_t_ptr) return int;
 598    pragma Import (C, pthread_setaffinity_np, "pthread_setaffinity_np");
 599    pragma Weak_External (pthread_setaffinity_np);
 600    --  Use a weak symbol because this function may be available or not,
 601    --  depending on the version of the system.
 602
 603    function pthread_attr_setaffinity_np
 604      (attr       : access pthread_attr_t;
 605       cpusetsize : size_t;
 606       cpuset     : cpu_set_t_ptr) return int;
 607    pragma Import (C, pthread_attr_setaffinity_np,
 608                     "pthread_attr_setaffinity_np");
 609    pragma Weak_External (pthread_attr_setaffinity_np);
 610    --  Use a weak symbol because this function may be available or not,
 611    --  depending on the version of the system.
 612
 613 private
 614
 615    type sigset_t is
 616      array (0 .. OS_Constants.SIZEOF_sigset - 1) of unsigned_char;
 617    pragma Convention (C, sigset_t);
 618    for sigset_t'Alignment use Interfaces.C.unsigned_long'Alignment;
 619
 620    pragma Warnings (Off);
 621    for struct_sigaction use record
 622       sa_handler at Linux.sa_handler_pos range 0 .. Standard'Address_Size - 1;
 623       sa_mask    at Linux.sa_mask_pos    range 0 .. 1023;
 624       sa_flags   at Linux.sa_flags_pos   range 0 .. int'Size - 1;
 625    end record;
 626    --  We intentionally leave sa_restorer unspecified and let the compiler
 627    --  append it after the last field, so disable corresponding warning.
 628    pragma Warnings (On);
 629
 630    type pid_t is new int;
 631
 632    subtype char_array is Interfaces.C.char_array;
 633
 634    type pthread_attr_t is record
 635       Data : char_array (1 .. OS_Constants.PTHREAD_ATTR_SIZE);
 636    end record;
 637    pragma Convention (C, pthread_attr_t);
 638    for pthread_attr_t'Alignment use Interfaces.C.unsigned_long'Alignment;
 639
 640    type pthread_condattr_t is record
 641       Data : char_array (1 .. OS_Constants.PTHREAD_CONDATTR_SIZE);
 642    end record;
 643    pragma Convention (C, pthread_condattr_t);
 644    for pthread_condattr_t'Alignment use Interfaces.C.int'Alignment;
 645
 646    type pthread_mutexattr_t is record
 647       Data : char_array (1 .. OS_Constants.PTHREAD_MUTEXATTR_SIZE);
 648    end  record;
 649    pragma Convention (C, pthread_mutexattr_t);
 650    for pthread_mutexattr_t'Alignment use Interfaces.C.int'Alignment;
 651
 652    type pthread_mutex_t is record
 653       Data : char_array (1 .. OS_Constants.PTHREAD_MUTEX_SIZE);
 654    end record;
 655    pragma Convention (C, pthread_mutex_t);
 656    for pthread_mutex_t'Alignment use Interfaces.C.unsigned_long'Alignment;
 657
 658    type pthread_rwlockattr_t is record
 659       Data : char_array (1 .. OS_Constants.PTHREAD_RWLOCKATTR_SIZE);
 660    end record;
 661    pragma Convention (C, pthread_rwlockattr_t);
 662    for pthread_rwlockattr_t'Alignment use Interfaces.C.unsigned_long'Alignment;
 663
 664    type pthread_rwlock_t is record
 665       Data : char_array (1 .. OS_Constants.PTHREAD_RWLOCK_SIZE);
 666    end record;
 667    pragma Convention (C, pthread_rwlock_t);
 668    for pthread_rwlock_t'Alignment use Interfaces.C.unsigned_long'Alignment;
 669
 670    type pthread_cond_t is record
 671       Data : char_array (1 .. OS_Constants.PTHREAD_COND_SIZE);
 672    end record;
 673    pragma Convention (C, pthread_cond_t);
 674    for pthread_cond_t'Alignment use Interfaces.Unsigned_64'Alignment;
 675
 676    type pthread_key_t is new unsigned;
 677
 678 end System.OS_Interface;