gcc/ada/s-osinte-rtems.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                GNU ADA 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) 1997-2011 Free Software Foundation, Inc.          --
  10 --                                                                          --
  11 -- GNARL is free software; you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNARL was developed by the GNARL team at Florida State University.       --
  28 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  29 --                                                                          --
  30 -- The GNARL files that were developed for RTEMS are maintained by  On-Line --
  31 -- Applications Research Corporation (http://www.oarcorp.com)  in  coopera- --
  32 -- tion with Ada Core Technologies Inc. and Florida State University.       --
  33 --                                                                          --
  34 ------------------------------------------------------------------------------
  35
  36 --  This is the RTEMS version of this package.
  37 --
  38 --  RTEMS target names are of the form CPU-rtems.
  39 --  This implementation is designed to work on ALL RTEMS targets.
  40 --  The RTEMS implementation is primarily based upon the POSIX threads
  41 --  API but there are also bindings to GNAT/RTEMS support routines
  42 --  to insulate this code from C API specific details and, in some
  43 --  cases, obtain target architecture and BSP specific information
  44 --  that is unavailable at the time this package is built.
  45
  46 --  This package encapsulates all direct interfaces to OS services
  47 --  that are needed by children of System.
  48
  49 --  PLEASE DO NOT add any with-clauses to this package
  50 --  or remove the pragma Preelaborate.
  51 --  It is designed to be a bottom-level (leaf) package.
  52
  53 with Interfaces.C;
  54 package System.OS_Interface is
  55    pragma Preelaborate;
  56
  57    --  This interface assumes that "unsigned" is a 32-bit entity.  This
  58    --  will correspond to RTEMS object ids.
  59
  60    subtype rtems_id       is Interfaces.C.unsigned;
  61
  62    subtype int            is Interfaces.C.int;
  63    subtype short          is Interfaces.C.short;
  64    subtype long           is Interfaces.C.long;
  65    subtype unsigned       is Interfaces.C.unsigned;
  66    subtype unsigned_short is Interfaces.C.unsigned_short;
  67    subtype unsigned_long  is Interfaces.C.unsigned_long;
  68    subtype unsigned_char  is Interfaces.C.unsigned_char;
  69    subtype plain_char     is Interfaces.C.plain_char;
  70    subtype size_t         is Interfaces.C.size_t;
  71
  72    -----------
  73    -- Errno --
  74    -----------
  75
  76    function errno return int;
  77    pragma Import (C, errno, "__get_errno");
  78
  79    EAGAIN    : constant := 11;
  80    EINTR     : constant := 4;
  81    EINVAL    : constant := 22;
  82    ENOMEM    : constant := 12;
  83    ETIMEDOUT : constant := 116;
  84
  85    -------------
  86    -- Signals --
  87    -------------
  88
  89    Num_HW_Interrupts : constant := 256;
  90
  91    Max_HW_Interrupt : constant := Num_HW_Interrupts - 1;
  92    type HW_Interrupt is new int range 0 .. Max_HW_Interrupt;
  93
  94    Max_Interrupt : constant := Max_HW_Interrupt;
  95
  96    type Signal is new int range 0 .. Max_Interrupt;
  97
  98    SIGXCPU     : constant := 0; --  XCPU
  99    SIGHUP      : constant := 1; --  hangup
 100    SIGINT      : constant := 2; --  interrupt (rubout)
 101    SIGQUIT     : constant := 3; --  quit (ASCD FS)
 102    SIGILL      : constant := 4; --  illegal instruction (not reset)
 103    SIGTRAP     : constant := 5; --  trace trap (not reset)
 104    SIGIOT      : constant := 6; --  IOT instruction
 105    SIGABRT     : constant := 6; --  used by abort, replace SIGIOT in the future
 106    SIGEMT      : constant := 7; --  EMT instruction
 107    SIGFPE      : constant := 8; --  floating point exception
 108    SIGKILL     : constant := 9; --  kill (cannot be caught or ignored)
 109    SIGBUS      : constant := 10; --  bus error
 110    SIGSEGV     : constant := 11; --  segmentation violation
 111    SIGSYS      : constant := 12; --  bad argument to system call
 112    SIGPIPE     : constant := 13; --  write on a pipe with no one to read it
 113    SIGALRM     : constant := 14; --  alarm clock
 114    SIGTERM     : constant := 15; --  software termination signal from kill
 115    SIGUSR1     : constant := 16; --  user defined signal 1
 116    SIGUSR2     : constant := 17; --  user defined signal 2
 117
 118    SIGADAABORT : constant := SIGABRT;
 119
 120    type Signal_Set is array (Natural range <>) of Signal;
 121
 122    Unmasked    : constant Signal_Set := (SIGTRAP, SIGALRM, SIGEMT);
 123    Reserved    : constant Signal_Set := (1 .. 1 => SIGKILL);
 124
 125    type sigset_t is private;
 126
 127    function sigaddset (set : access sigset_t; sig : Signal) return int;
 128    pragma Import (C, sigaddset, "sigaddset");
 129
 130    function sigdelset (set : access sigset_t; sig : Signal) return int;
 131    pragma Import (C, sigdelset, "sigdelset");
 132
 133    function sigfillset (set : access sigset_t) return int;
 134    pragma Import (C, sigfillset, "sigfillset");
 135
 136    function sigismember (set : access sigset_t; sig : Signal) return int;
 137    pragma Import (C, sigismember, "sigismember");
 138
 139    function sigemptyset (set : access sigset_t) return int;
 140    pragma Import (C, sigemptyset, "sigemptyset");
 141
 142    type struct_sigaction is record
 143       sa_flags   : int;
 144       sa_mask    : sigset_t;
 145       sa_handler : System.Address;
 146    end record;
 147    pragma Convention (C, struct_sigaction);
 148    type struct_sigaction_ptr is access all struct_sigaction;
 149
 150    SA_SIGINFO  : constant := 16#02#;
 151
 152    SA_ONSTACK : constant := 16#00#;
 153    --  SA_ONSTACK is not defined on RTEMS, but it is referred to in the POSIX
 154    --  implementation of System.Interrupt_Management. Therefore we define a
 155    --  dummy value of zero here so that setting this flag is a nop.
 156
 157    SIG_BLOCK   : constant := 1;
 158    SIG_UNBLOCK : constant := 2;
 159    SIG_SETMASK : constant := 3;
 160
 161    SIG_DFL : constant := 0;
 162    SIG_IGN : constant := 1;
 163
 164    function sigaction
 165      (sig  : Signal;
 166       act  : struct_sigaction_ptr;
 167       oact : struct_sigaction_ptr) return int;
 168    pragma Import (C, sigaction, "sigaction");
 169
 170    ----------
 171    -- Time --
 172    ----------
 173
 174    Time_Slice_Supported : constant Boolean := True;
 175    --  Indicates whether time slicing is supported (i.e SCHED_RR is supported)
 176
 177    type timespec is private;
 178
 179    type clockid_t is new int;
 180
 181    CLOCK_REALTIME  : constant clockid_t;
 182    CLOCK_MONOTONIC : constant clockid_t;
 183
 184    function clock_gettime
 185      (clock_id : clockid_t;
 186       tp       : access timespec) return int;
 187    pragma Import (C, clock_gettime, "clock_gettime");
 188
 189    function To_Duration (TS : timespec) return Duration;
 190    pragma Inline (To_Duration);
 191
 192    function To_Timespec (D : Duration) return timespec;
 193    pragma Inline (To_Timespec);
 194
 195    -------------------------
 196    -- Priority Scheduling --
 197    -------------------------
 198
 199    SCHED_FIFO  : constant := 1;
 200    SCHED_RR    : constant := 2;
 201    SCHED_OTHER : constant := 0;
 202
 203    function To_Target_Priority
 204      (Prio : System.Any_Priority) return Interfaces.C.int;
 205    --  Maps System.Any_Priority to a POSIX priority
 206
 207    -------------
 208    -- Process --
 209    -------------
 210
 211    type pid_t is private;
 212
 213    function kill (pid : pid_t; sig : Signal) return int;
 214    pragma Import (C, kill, "kill");
 215
 216    function getpid return pid_t;
 217    pragma Import (C, getpid, "getpid");
 218
 219    ---------
 220    -- LWP --
 221    ---------
 222
 223    function lwp_self return System.Address;
 224    --  lwp_self does not exist on this thread library, revert to pthread_self
 225    --  which is the closest approximation (with getpid). This function is
 226    --  needed to share 7staprop.adb across POSIX-like targets.
 227    pragma Import (C, lwp_self, "pthread_self");
 228
 229    -------------
 230    -- Threads --
 231    -------------
 232
 233    type Thread_Body is access
 234      function (arg : System.Address) return System.Address;
 235    pragma Convention (C, Thread_Body);
 236
 237    type pthread_t           is private;
 238    subtype Thread_Id        is pthread_t;
 239
 240    type pthread_mutex_t      is limited private;
 241    type pthread_rwlock_t     is limited private;
 242    type pthread_cond_t       is limited private;
 243    type pthread_attr_t       is limited private;
 244    type pthread_mutexattr_t  is limited private;
 245    type pthread_rwlockattr_t is limited private;
 246    type pthread_condattr_t   is limited private;
 247    type pthread_key_t        is private;
 248
 249    No_Key : constant pthread_key_t;
 250
 251    PTHREAD_CREATE_DETACHED : constant := 0;
 252
 253    PTHREAD_SCOPE_PROCESS : constant := 0;
 254    PTHREAD_SCOPE_SYSTEM  : constant := 1;
 255
 256    -----------
 257    -- Stack --
 258    -----------
 259
 260    type stack_t is record
 261       ss_sp    : System.Address;
 262       ss_flags : int;
 263       ss_size  : size_t;
 264    end record;
 265    pragma Convention (C, stack_t);
 266
 267    function sigaltstack
 268      (ss  : not null access stack_t;
 269       oss : access stack_t) return int;
 270
 271    Alternate_Stack : aliased System.Address;
 272    --  This is a dummy definition, never used (Alternate_Stack_Size is null)
 273
 274    Alternate_Stack_Size : constant := 0;
 275    --  No alternate signal stack is used on this platform
 276
 277    Stack_Base_Available : constant Boolean := False;
 278    --  Indicates whether the stack base is available on this target.
 279    --  This allows us to share s-osinte.adb between all the FSU/RTEMS
 280    --  run time.
 281    --  Note that this value can only be true if pthread_t has a complete
 282    --  definition that corresponds exactly to the C header files.
 283
 284    function Get_Stack_Base (thread : pthread_t) return Address;
 285    pragma Inline (Get_Stack_Base);
 286    --  returns the stack base of the specified thread.
 287    --  Only call this function when Stack_Base_Available is True.
 288
 289    --  These two functions are only needed to share s-taprop.adb with
 290    --  FSU threads.
 291
 292    function Get_Page_Size return size_t;
 293    function Get_Page_Size return Address;
 294    pragma Import (C, Get_Page_Size, "getpagesize");
 295    --  Returns the size of a page
 296
 297    PROT_ON  : constant := 0;
 298    PROT_OFF : constant := 0;
 299
 300    function mprotect (addr : Address; len : size_t; prot : int) return int;
 301    pragma Import (C, mprotect);
 302
 303    -----------------------------------------
 304    --  Nonstandard Thread Initialization  --
 305    -----------------------------------------
 306
 307    procedure pthread_init;
 308    --  FSU_THREADS requires pthread_init, which is nonstandard
 309    --  and this should be invoked during the elaboration of s-taprop.adb
 310    --
 311    --  RTEMS does not require this so we provide an empty Ada body.
 312
 313    -------------------------
 314    -- POSIX.1c  Section 3 --
 315    -------------------------
 316
 317    function sigwait
 318      (set : access sigset_t;
 319       sig : access Signal) return int;
 320    pragma Import (C, sigwait, "sigwait");
 321
 322    function pthread_kill
 323      (thread : pthread_t;
 324       sig    : Signal) return int;
 325    pragma Import (C, pthread_kill, "pthread_kill");
 326
 327    function pthread_sigmask
 328      (how  : int;
 329       set  : access sigset_t;
 330       oset : access sigset_t) return int;
 331    pragma Import (C, pthread_sigmask, "pthread_sigmask");
 332
 333    ----------------------------
 334    --  POSIX.1c  Section 11  --
 335    ----------------------------
 336
 337    function pthread_mutexattr_init
 338      (attr : access pthread_mutexattr_t) return int;
 339    pragma Import (C, pthread_mutexattr_init, "pthread_mutexattr_init");
 340
 341    function pthread_mutexattr_destroy
 342      (attr : access pthread_mutexattr_t) return int;
 343    pragma Import (C, pthread_mutexattr_destroy, "pthread_mutexattr_destroy");
 344
 345    function pthread_mutex_init
 346      (mutex : access pthread_mutex_t;
 347       attr  : access pthread_mutexattr_t) return int;
 348    pragma Import (C, pthread_mutex_init, "pthread_mutex_init");
 349
 350    function pthread_mutex_destroy (mutex : access pthread_mutex_t) return int;
 351    pragma Import (C, pthread_mutex_destroy, "pthread_mutex_destroy");
 352
 353    function pthread_mutex_lock (mutex : access pthread_mutex_t) return int;
 354    pragma Import (C, pthread_mutex_lock, "pthread_mutex_lock");
 355
 356    function pthread_mutex_unlock (mutex : access pthread_mutex_t) return int;
 357    pragma Import (C, pthread_mutex_unlock, "pthread_mutex_unlock");
 358
 359    function pthread_rwlockattr_init
 360      (attr : access pthread_rwlockattr_t) return int;
 361    pragma Import (C, pthread_rwlockattr_init, "pthread_rwlockattr_init");
 362
 363    function pthread_rwlockattr_destroy
 364      (attr : access pthread_rwlockattr_t) return int;
 365    pragma Import (C, pthread_rwlockattr_destroy, "pthread_rwlockattr_destroy");
 366
 367    PTHREAD_RWLOCK_PREFER_READER_NP              : constant := 0;
 368    PTHREAD_RWLOCK_PREFER_WRITER_NP              : constant := 1;
 369    PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP : constant := 2;
 370
 371    function pthread_rwlockattr_setkind_np
 372      (attr : access pthread_rwlockattr_t;
 373       pref : int) return int;
 374
 375    function pthread_rwlock_init
 376      (mutex : access pthread_rwlock_t;
 377       attr  : access pthread_rwlockattr_t) return int;
 378    pragma Import (C, pthread_rwlock_init, "pthread_rwlock_init");
 379
 380    function pthread_rwlock_destroy
 381      (mutex : access pthread_rwlock_t) return int;
 382    pragma Import (C, pthread_rwlock_destroy, "pthread_rwlock_destroy");
 383
 384    function pthread_rwlock_rdlock (mutex : access pthread_rwlock_t) return int;
 385    pragma Import (C, pthread_rwlock_rdlock, "pthread_rwlock_rdlock");
 386
 387    function pthread_rwlock_wrlock (mutex : access pthread_rwlock_t) return int;
 388    pragma Import (C, pthread_rwlock_wrlock, "pthread_rwlock_wrlock");
 389
 390    function pthread_rwlock_unlock (mutex : access pthread_rwlock_t) return int;
 391    pragma Import (C, pthread_rwlock_unlock, "pthread_rwlock_unlock");
 392
 393    function pthread_condattr_init
 394      (attr : access pthread_condattr_t) return int;
 395    pragma Import (C, pthread_condattr_init, "pthread_condattr_init");
 396
 397    function pthread_condattr_destroy
 398      (attr : access pthread_condattr_t) return int;
 399    pragma Import (C, pthread_condattr_destroy, "pthread_condattr_destroy");
 400
 401    function pthread_cond_init
 402      (cond : access pthread_cond_t;
 403       attr : access pthread_condattr_t) return int;
 404    pragma Import (C, pthread_cond_init, "pthread_cond_init");
 405
 406    function pthread_cond_destroy (cond : access pthread_cond_t) return int;
 407    pragma Import (C, pthread_cond_destroy, "pthread_cond_destroy");
 408
 409    function pthread_cond_signal (cond : access pthread_cond_t) return int;
 410    pragma Import (C, pthread_cond_signal, "pthread_cond_signal");
 411
 412    function pthread_cond_wait
 413      (cond  : access pthread_cond_t;
 414       mutex : access pthread_mutex_t) return int;
 415    pragma Import (C, pthread_cond_wait, "pthread_cond_wait");
 416
 417    function pthread_cond_timedwait
 418      (cond    : access pthread_cond_t;
 419       mutex   : access pthread_mutex_t;
 420       abstime : access timespec) return int;
 421    pragma Import (C, pthread_cond_timedwait, "pthread_cond_timedwait");
 422
 423    Relative_Timed_Wait : constant Boolean := False;
 424    --  pthread_cond_timedwait requires an absolute delay time
 425
 426    --------------------------
 427    -- POSIX.1c  Section 13 --
 428    --------------------------
 429
 430    PTHREAD_PRIO_NONE    : constant := 0;
 431    PTHREAD_PRIO_PROTECT : constant := 2;
 432    PTHREAD_PRIO_INHERIT : constant := 1;
 433
 434    function pthread_mutexattr_setprotocol
 435      (attr     : access pthread_mutexattr_t;
 436       protocol : int) return int;
 437    pragma Import (C, pthread_mutexattr_setprotocol);
 438
 439    function pthread_mutexattr_setprioceiling
 440      (attr     : access pthread_mutexattr_t;
 441       prioceiling : int) return int;
 442    pragma Import
 443      (C, pthread_mutexattr_setprioceiling,
 444       "pthread_mutexattr_setprioceiling");
 445
 446    type struct_sched_param is record
 447       sched_priority      : int;
 448       ss_low_priority     : int;
 449       ss_replenish_period : timespec;
 450       ss_initial_budget   : timespec;
 451    end record;
 452    pragma Convention (C, struct_sched_param);
 453
 454    function pthread_setschedparam
 455      (thread : pthread_t;
 456       policy : int;
 457       param  : access struct_sched_param) return int;
 458    pragma Import (C, pthread_setschedparam, "pthread_setschedparam");
 459
 460    function pthread_attr_setscope
 461      (attr            : access pthread_attr_t;
 462       contentionscope : int) return int;
 463    pragma Import (C, pthread_attr_setscope, "pthread_attr_setscope");
 464
 465    function pthread_attr_setinheritsched
 466      (attr         : access pthread_attr_t;
 467       inheritsched : int) return int;
 468    pragma Import (C, pthread_attr_setinheritsched);
 469
 470    function pthread_attr_setschedpolicy
 471      (attr   : access pthread_attr_t;
 472       policy : int) return int;
 473    pragma Import (C, pthread_attr_setschedpolicy);
 474
 475    function pthread_attr_setschedparam
 476      (attr        : access pthread_attr_t;
 477       sched_param : int) return int;
 478    pragma Import (C, pthread_attr_setschedparam);
 479
 480    function sched_yield return int;
 481    pragma Import (C, sched_yield, "sched_yield");
 482
 483    ---------------------------
 484    -- P1003.1c - Section 16 --
 485    ---------------------------
 486
 487    function pthread_attr_init (attributes : access pthread_attr_t) return int;
 488    pragma Import (C, pthread_attr_init, "pthread_attr_init");
 489
 490    function pthread_attr_destroy
 491      (attributes : access pthread_attr_t) return int;
 492    pragma Import (C, pthread_attr_destroy, "pthread_attr_destroy");
 493
 494    function pthread_attr_setdetachstate
 495      (attr        : access pthread_attr_t;
 496       detachstate : int) return int;
 497    pragma Import (C, pthread_attr_setdetachstate);
 498
 499    function pthread_attr_setstacksize
 500      (attr      : access pthread_attr_t;
 501       stacksize : size_t) return int;
 502    pragma Import (C, pthread_attr_setstacksize, "pthread_attr_setstacksize");
 503
 504    function pthread_create
 505      (thread        : access pthread_t;
 506       attributes    : access pthread_attr_t;
 507       start_routine : Thread_Body;
 508       arg           : System.Address) return int;
 509    pragma Import (C, pthread_create, "pthread_create");
 510
 511    procedure pthread_exit (status : System.Address);
 512    pragma Import (C, pthread_exit, "pthread_exit");
 513
 514    function pthread_self return pthread_t;
 515    pragma Import (C, pthread_self, "pthread_self");
 516
 517    --------------------------
 518    -- POSIX.1c  Section 17 --
 519    --------------------------
 520
 521    function pthread_setspecific
 522      (key   : pthread_key_t;
 523       value : System.Address) return int;
 524    pragma Import (C, pthread_setspecific, "pthread_setspecific");
 525
 526    function pthread_getspecific (key : pthread_key_t) return System.Address;
 527    pragma Import (C, pthread_getspecific, "pthread_getspecific");
 528
 529    type destructor_pointer is access procedure (arg : System.Address);
 530    pragma Convention (C, destructor_pointer);
 531
 532    function pthread_key_create
 533      (key        : access pthread_key_t;
 534       destructor : destructor_pointer) return int;
 535    pragma Import (C, pthread_key_create, "pthread_key_create");
 536
 537    ------------------------------------------------------------
 538    --   Binary Semaphore Wrapper to Support Interrupt Tasks  --
 539    ------------------------------------------------------------
 540
 541    type Binary_Semaphore_Id is new rtems_id;
 542
 543    function Binary_Semaphore_Create return Binary_Semaphore_Id;
 544    pragma Import (
 545       C,
 546       Binary_Semaphore_Create,
 547       "__gnat_binary_semaphore_create");
 548
 549    function Binary_Semaphore_Delete (ID : Binary_Semaphore_Id) return int;
 550    pragma Import (
 551       C,
 552       Binary_Semaphore_Delete,
 553       "__gnat_binary_semaphore_delete");
 554
 555    function Binary_Semaphore_Obtain (ID : Binary_Semaphore_Id) return int;
 556    pragma Import (
 557       C,
 558       Binary_Semaphore_Obtain,
 559       "__gnat_binary_semaphore_obtain");
 560
 561    function Binary_Semaphore_Release (ID : Binary_Semaphore_Id) return int;
 562    pragma Import (
 563       C,
 564       Binary_Semaphore_Release,
 565       "__gnat_binary_semaphore_release");
 566
 567    function Binary_Semaphore_Flush (ID : Binary_Semaphore_Id) return int;
 568    pragma Import (
 569       C,
 570       Binary_Semaphore_Flush,
 571       "__gnat_binary_semaphore_flush");
 572
 573    ------------------------------------------------------------
 574    -- Hardware Interrupt Wrappers to Support Interrupt Tasks --
 575    ------------------------------------------------------------
 576
 577    type Interrupt_Handler is access procedure (parameter : System.Address);
 578    pragma Convention (C, Interrupt_Handler);
 579    type Interrupt_Vector is new System.Address;
 580
 581    function Interrupt_Connect
 582      (vector    : Interrupt_Vector;
 583       handler   : Interrupt_Handler;
 584       parameter : System.Address := System.Null_Address) return int;
 585    pragma Import (C, Interrupt_Connect, "__gnat_interrupt_connect");
 586    --  Use this to set up an user handler. The routine installs a
 587    --  a user handler which is invoked after RTEMS has saved enough
 588    --  context for a high-level language routine to be safely invoked.
 589
 590    function Interrupt_Vector_Get
 591      (Vector : Interrupt_Vector) return Interrupt_Handler;
 592    pragma Import (C, Interrupt_Vector_Get, "__gnat_interrupt_get");
 593    --  Use this to get the existing handler for later restoral.
 594
 595    procedure Interrupt_Vector_Set
 596      (Vector  : Interrupt_Vector;
 597       Handler : Interrupt_Handler);
 598    pragma Import (C, Interrupt_Vector_Set, "__gnat_interrupt_set");
 599    --  Use this to restore a handler obtained using Interrupt_Vector_Get.
 600
 601    function Interrupt_Number_To_Vector (intNum : int) return Interrupt_Vector;
 602    --  Convert a logical interrupt number to the hardware interrupt vector
 603    --  number used to connect the interrupt.
 604    pragma Import (
 605       C,
 606       Interrupt_Number_To_Vector,
 607       "__gnat_interrupt_number_to_vector"
 608    );
 609
 610 private
 611
 612    type sigset_t is new int;
 613
 614    type pid_t is new int;
 615
 616    type time_t is new long;
 617
 618    type timespec is record
 619       tv_sec  : time_t;
 620       tv_nsec : long;
 621    end record;
 622    pragma Convention (C, timespec);
 623
 624    CLOCK_REALTIME :  constant clockid_t := 1;
 625    CLOCK_MONOTONIC : constant clockid_t := 4;
 626
 627    type pthread_attr_t is record
 628       is_initialized  : int;
 629       stackaddr       : System.Address;
 630       stacksize       : int;
 631       contentionscope : int;
 632       inheritsched    : int;
 633       schedpolicy     : int;
 634       schedparam      : struct_sched_param;
 635       cputime_clocked_allowed : int;
 636       detatchstate    : int;
 637    end record;
 638    pragma Convention (C, pthread_attr_t);
 639
 640    type pthread_condattr_t is record
 641       flags           : int;
 642       process_shared  : int;
 643    end record;
 644    pragma Convention (C, pthread_condattr_t);
 645
 646    type pthread_mutexattr_t is record
 647       is_initialized  : int;
 648       process_shared  : int;
 649       prio_ceiling    : int;
 650       protocol        : int;
 651       mutex_type      : int;
 652       recursive       : int;
 653    end record;
 654    pragma Convention (C, pthread_mutexattr_t);
 655
 656    type pthread_rwlockattr_t is record
 657       is_initialized  : int;
 658       process_shared  : int;
 659    end record;
 660    pragma Convention (C, pthread_rwlockattr_t);
 661
 662    type pthread_t is new rtems_id;
 663
 664    type pthread_mutex_t is new rtems_id;
 665
 666    type pthread_rwlock_t is new rtems_id;
 667
 668    type pthread_cond_t is new rtems_id;
 669
 670    type pthread_key_t is new rtems_id;
 671
 672    No_Key : constant pthread_key_t := 0;
 673
 674 end System.OS_Interface;