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) 1997-2009 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 private;
 180
 181    CLOCK_REALTIME : constant clockid_t;
 182
 183    function clock_gettime
 184      (clock_id : clockid_t;
 185       tp       : access timespec) return int;
 186    pragma Import (C, clock_gettime, "clock_gettime");
 187
 188    function To_Duration (TS : timespec) return Duration;
 189    pragma Inline (To_Duration);
 190
 191    function To_Timespec (D : Duration) return timespec;
 192    pragma Inline (To_Timespec);
 193
 194    type struct_timeval is private;
 195
 196    function To_Duration (TV : struct_timeval) return Duration;
 197    pragma Inline (To_Duration);
 198
 199    function To_Timeval (D : Duration) return struct_timeval;
 200    pragma Inline (To_Timeval);
 201
 202    -------------------------
 203    -- Priority Scheduling --
 204    -------------------------
 205
 206    SCHED_FIFO  : constant := 1;
 207    SCHED_RR    : constant := 2;
 208    SCHED_OTHER : constant := 0;
 209
 210    function To_Target_Priority
 211      (Prio : System.Any_Priority) return Interfaces.C.int;
 212    --  Maps System.Any_Priority to a POSIX priority
 213
 214    -------------
 215    -- Process --
 216    -------------
 217
 218    type pid_t is private;
 219
 220    function kill (pid : pid_t; sig : Signal) return int;
 221    pragma Import (C, kill, "kill");
 222
 223    function getpid return pid_t;
 224    pragma Import (C, getpid, "getpid");
 225
 226    ---------
 227    -- LWP --
 228    ---------
 229
 230    function lwp_self return System.Address;
 231    --  lwp_self does not exist on this thread library, revert to pthread_self
 232    --  which is the closest approximation (with getpid). This function is
 233    --  needed to share 7staprop.adb across POSIX-like targets.
 234    pragma Import (C, lwp_self, "pthread_self");
 235
 236    -------------
 237    -- Threads --
 238    -------------
 239
 240    type Thread_Body is access
 241      function (arg : System.Address) return System.Address;
 242    pragma Convention (C, Thread_Body);
 243
 244    type pthread_t           is private;
 245    subtype Thread_Id        is pthread_t;
 246
 247    type pthread_mutex_t     is limited private;
 248    type pthread_cond_t      is limited private;
 249    type pthread_attr_t      is limited private;
 250    type pthread_mutexattr_t is limited private;
 251    type pthread_condattr_t  is limited private;
 252    type pthread_key_t       is private;
 253
 254    No_Key : constant pthread_key_t;
 255
 256    PTHREAD_CREATE_DETACHED : constant := 0;
 257
 258    PTHREAD_SCOPE_PROCESS : constant := 0;
 259    PTHREAD_SCOPE_SYSTEM  : constant := 1;
 260
 261    -----------
 262    -- Stack --
 263    -----------
 264
 265    type stack_t is record
 266       ss_sp    : System.Address;
 267       ss_flags : int;
 268       ss_size  : size_t;
 269    end record;
 270    pragma Convention (C, stack_t);
 271
 272    function sigaltstack
 273      (ss  : not null access stack_t;
 274       oss : access stack_t) return int;
 275
 276    Alternate_Stack : aliased System.Address;
 277    --  This is a dummy definition, never used (Alternate_Stack_Size is null)
 278
 279    Alternate_Stack_Size : constant := 0;
 280    --  No alternate signal stack is used on this platform
 281
 282    Stack_Base_Available : constant Boolean := False;
 283    --  Indicates whether the stack base is available on this target.
 284    --  This allows us to share s-osinte.adb between all the FSU/RTEMS
 285    --  run time.
 286    --  Note that this value can only be true if pthread_t has a complete
 287    --  definition that corresponds exactly to the C header files.
 288
 289    function Get_Stack_Base (thread : pthread_t) return Address;
 290    pragma Inline (Get_Stack_Base);
 291    --  returns the stack base of the specified thread.
 292    --  Only call this function when Stack_Base_Available is True.
 293
 294    --  These two functions are only needed to share s-taprop.adb with
 295    --  FSU threads.
 296
 297    function Get_Page_Size return size_t;
 298    function Get_Page_Size return Address;
 299    pragma Import (C, Get_Page_Size, "getpagesize");
 300    --  Returns the size of a page
 301
 302    PROT_ON  : constant := 0;
 303    PROT_OFF : constant := 0;
 304
 305    function mprotect (addr : Address; len : size_t; prot : int) return int;
 306    pragma Import (C, mprotect);
 307
 308    -----------------------------------------
 309    --  Nonstandard Thread Initialization  --
 310    -----------------------------------------
 311
 312    procedure pthread_init;
 313    --  FSU_THREADS requires pthread_init, which is nonstandard
 314    --  and this should be invoked during the elaboration of s-taprop.adb
 315    --
 316    --  RTEMS does not require this so we provide an empty Ada body.
 317
 318    -------------------------
 319    -- POSIX.1c  Section 3 --
 320    -------------------------
 321
 322    function sigwait
 323      (set : access sigset_t;
 324       sig : access Signal) return int;
 325    pragma Import (C, sigwait, "sigwait");
 326
 327    function pthread_kill
 328      (thread : pthread_t;
 329       sig    : Signal) return int;
 330    pragma Import (C, pthread_kill, "pthread_kill");
 331
 332    function pthread_sigmask
 333      (how  : int;
 334       set  : access sigset_t;
 335       oset : access sigset_t) return int;
 336    pragma Import (C, pthread_sigmask, "pthread_sigmask");
 337
 338    ----------------------------
 339    --  POSIX.1c  Section 11  --
 340    ----------------------------
 341
 342    function pthread_mutexattr_init
 343      (attr : access pthread_mutexattr_t) return int;
 344    pragma Import (C, pthread_mutexattr_init, "pthread_mutexattr_init");
 345
 346    function pthread_mutexattr_destroy
 347      (attr : access pthread_mutexattr_t) return int;
 348    pragma Import (C, pthread_mutexattr_destroy, "pthread_mutexattr_destroy");
 349
 350    function pthread_mutex_init
 351      (mutex : access pthread_mutex_t;
 352       attr  : access pthread_mutexattr_t) return int;
 353    pragma Import (C, pthread_mutex_init, "pthread_mutex_init");
 354
 355    function pthread_mutex_destroy (mutex : access pthread_mutex_t) return int;
 356    pragma Import (C, pthread_mutex_destroy, "pthread_mutex_destroy");
 357
 358    function pthread_mutex_lock (mutex : access pthread_mutex_t) return int;
 359    pragma Import (C, pthread_mutex_lock, "pthread_mutex_lock");
 360
 361    function pthread_mutex_unlock (mutex : access pthread_mutex_t) return int;
 362    pragma Import (C, pthread_mutex_unlock, "pthread_mutex_unlock");
 363
 364    function pthread_condattr_init
 365      (attr : access pthread_condattr_t) return int;
 366    pragma Import (C, pthread_condattr_init, "pthread_condattr_init");
 367
 368    function pthread_condattr_destroy
 369      (attr : access pthread_condattr_t) return int;
 370    pragma Import (C, pthread_condattr_destroy, "pthread_condattr_destroy");
 371
 372    function pthread_cond_init
 373      (cond : access pthread_cond_t;
 374       attr : access pthread_condattr_t) return int;
 375    pragma Import (C, pthread_cond_init, "pthread_cond_init");
 376
 377    function pthread_cond_destroy (cond : access pthread_cond_t) return int;
 378    pragma Import (C, pthread_cond_destroy, "pthread_cond_destroy");
 379
 380    function pthread_cond_signal (cond : access pthread_cond_t) return int;
 381    pragma Import (C, pthread_cond_signal, "pthread_cond_signal");
 382
 383    function pthread_cond_wait
 384      (cond  : access pthread_cond_t;
 385       mutex : access pthread_mutex_t) return int;
 386    pragma Import (C, pthread_cond_wait, "pthread_cond_wait");
 387
 388    function pthread_cond_timedwait
 389      (cond    : access pthread_cond_t;
 390       mutex   : access pthread_mutex_t;
 391       abstime : access timespec) return int;
 392    pragma Import (C, pthread_cond_timedwait, "pthread_cond_timedwait");
 393
 394    Relative_Timed_Wait : constant Boolean := False;
 395    --  pthread_cond_timedwait requires an absolute delay time
 396
 397    --------------------------
 398    -- POSIX.1c  Section 13 --
 399    --------------------------
 400
 401    PTHREAD_PRIO_NONE    : constant := 0;
 402    PTHREAD_PRIO_PROTECT : constant := 2;
 403    PTHREAD_PRIO_INHERIT : constant := 1;
 404
 405    function pthread_mutexattr_setprotocol
 406      (attr     : access pthread_mutexattr_t;
 407       protocol : int) return int;
 408    pragma Import (C, pthread_mutexattr_setprotocol);
 409
 410    function pthread_mutexattr_setprioceiling
 411      (attr     : access pthread_mutexattr_t;
 412       prioceiling : int) return int;
 413    pragma Import
 414      (C, pthread_mutexattr_setprioceiling,
 415       "pthread_mutexattr_setprioceiling");
 416
 417    type struct_sched_param is record
 418       sched_priority      : int;
 419       ss_low_priority     : int;
 420       ss_replenish_period : timespec;
 421       ss_initial_budget   : timespec;
 422    end record;
 423    pragma Convention (C, struct_sched_param);
 424
 425    function pthread_setschedparam
 426      (thread : pthread_t;
 427       policy : int;
 428       param  : access struct_sched_param) return int;
 429    pragma Import (C, pthread_setschedparam, "pthread_setschedparam");
 430
 431    function pthread_attr_setscope
 432      (attr            : access pthread_attr_t;
 433       contentionscope : int) return int;
 434    pragma Import (C, pthread_attr_setscope, "pthread_attr_setscope");
 435
 436    function pthread_attr_setinheritsched
 437      (attr         : access pthread_attr_t;
 438       inheritsched : int) return int;
 439    pragma Import (C, pthread_attr_setinheritsched);
 440
 441    function pthread_attr_setschedpolicy
 442      (attr   : access pthread_attr_t;
 443       policy : int) return int;
 444    pragma Import (C, pthread_attr_setschedpolicy);
 445
 446    function pthread_attr_setschedparam
 447      (attr        : access pthread_attr_t;
 448       sched_param : int) return int;
 449    pragma Import (C, pthread_attr_setschedparam);
 450
 451    function sched_yield return int;
 452    pragma Import (C, sched_yield, "sched_yield");
 453
 454    ---------------------------
 455    -- P1003.1c - Section 16 --
 456    ---------------------------
 457
 458    function pthread_attr_init (attributes : access pthread_attr_t) return int;
 459    pragma Import (C, pthread_attr_init, "pthread_attr_init");
 460
 461    function pthread_attr_destroy
 462      (attributes : access pthread_attr_t) return int;
 463    pragma Import (C, pthread_attr_destroy, "pthread_attr_destroy");
 464
 465    function pthread_attr_setdetachstate
 466      (attr        : access pthread_attr_t;
 467       detachstate : int) return int;
 468    pragma Import (C, pthread_attr_setdetachstate);
 469
 470    function pthread_attr_setstacksize
 471      (attr      : access pthread_attr_t;
 472       stacksize : size_t) return int;
 473    pragma Import (C, pthread_attr_setstacksize, "pthread_attr_setstacksize");
 474
 475    function pthread_create
 476      (thread        : access pthread_t;
 477       attributes    : access pthread_attr_t;
 478       start_routine : Thread_Body;
 479       arg           : System.Address) return int;
 480    pragma Import (C, pthread_create, "pthread_create");
 481
 482    procedure pthread_exit (status : System.Address);
 483    pragma Import (C, pthread_exit, "pthread_exit");
 484
 485    function pthread_self return pthread_t;
 486    pragma Import (C, pthread_self, "pthread_self");
 487
 488    --------------------------
 489    -- POSIX.1c  Section 17 --
 490    --------------------------
 491
 492    function pthread_setspecific
 493      (key   : pthread_key_t;
 494       value : System.Address) return int;
 495    pragma Import (C, pthread_setspecific, "pthread_setspecific");
 496
 497    function pthread_getspecific (key : pthread_key_t) return System.Address;
 498    pragma Import (C, pthread_getspecific, "pthread_getspecific");
 499
 500    type destructor_pointer is access procedure (arg : System.Address);
 501    pragma Convention (C, destructor_pointer);
 502
 503    function pthread_key_create
 504      (key        : access pthread_key_t;
 505       destructor : destructor_pointer) return int;
 506    pragma Import (C, pthread_key_create, "pthread_key_create");
 507
 508    ------------------------------------------------------------
 509    --   Binary Semaphore Wrapper to Support Interrupt Tasks  --
 510    ------------------------------------------------------------
 511
 512    type Binary_Semaphore_Id is new rtems_id;
 513
 514    function Binary_Semaphore_Create return Binary_Semaphore_Id;
 515    pragma Import (
 516       C,
 517       Binary_Semaphore_Create,
 518       "__gnat_binary_semaphore_create");
 519
 520    function Binary_Semaphore_Delete (ID : Binary_Semaphore_Id) return int;
 521    pragma Import (
 522       C,
 523       Binary_Semaphore_Delete,
 524       "__gnat_binary_semaphore_delete");
 525
 526    function Binary_Semaphore_Obtain (ID : Binary_Semaphore_Id) return int;
 527    pragma Import (
 528       C,
 529       Binary_Semaphore_Obtain,
 530       "__gnat_binary_semaphore_obtain");
 531
 532    function Binary_Semaphore_Release (ID : Binary_Semaphore_Id) return int;
 533    pragma Import (
 534       C,
 535       Binary_Semaphore_Release,
 536       "__gnat_binary_semaphore_release");
 537
 538    function Binary_Semaphore_Flush (ID : Binary_Semaphore_Id) return int;
 539    pragma Import (
 540       C,
 541       Binary_Semaphore_Flush,
 542       "__gnat_binary_semaphore_flush");
 543
 544    ------------------------------------------------------------
 545    -- Hardware Interrupt Wrappers to Support Interrupt Tasks --
 546    ------------------------------------------------------------
 547
 548    type Interrupt_Handler is access procedure (parameter : System.Address);
 549    pragma Convention (C, Interrupt_Handler);
 550    type Interrupt_Vector is new System.Address;
 551
 552    function Interrupt_Connect
 553      (vector    : Interrupt_Vector;
 554       handler   : Interrupt_Handler;
 555       parameter : System.Address := System.Null_Address) return int;
 556    pragma Import (C, Interrupt_Connect, "__gnat_interrupt_connect");
 557    --  Use this to set up an user handler. The routine installs a
 558    --  a user handler which is invoked after RTEMS has saved enough
 559    --  context for a high-level language routine to be safely invoked.
 560
 561    function Interrupt_Vector_Get
 562      (Vector : Interrupt_Vector) return Interrupt_Handler;
 563    pragma Import (C, Interrupt_Vector_Get, "__gnat_interrupt_get");
 564    --  Use this to get the existing handler for later restoral.
 565
 566    procedure Interrupt_Vector_Set
 567      (Vector  : Interrupt_Vector;
 568       Handler : Interrupt_Handler);
 569    pragma Import (C, Interrupt_Vector_Set, "__gnat_interrupt_set");
 570    --  Use this to restore a handler obtained using Interrupt_Vector_Get.
 571
 572    function Interrupt_Number_To_Vector (intNum : int) return Interrupt_Vector;
 573    --  Convert a logical interrupt number to the hardware interrupt vector
 574    --  number used to connect the interrupt.
 575    pragma Import (
 576       C,
 577       Interrupt_Number_To_Vector,
 578       "__gnat_interrupt_number_to_vector"
 579    );
 580
 581 private
 582
 583    type sigset_t is new int;
 584
 585    type pid_t is new int;
 586
 587    type time_t is new long;
 588
 589    type timespec is record
 590       tv_sec  : time_t;
 591       tv_nsec : long;
 592    end record;
 593    pragma Convention (C, timespec);
 594
 595    type clockid_t is new rtems_id;
 596    CLOCK_REALTIME : constant clockid_t := 1;
 597
 598    type struct_timeval is record
 599       tv_sec  : int;
 600       tv_usec : int;
 601    end record;
 602    pragma Convention (C, struct_timeval);
 603
 604    type pthread_attr_t is record
 605       is_initialized  : int;
 606       stackaddr       : System.Address;
 607       stacksize       : int;
 608       contentionscope : int;
 609       inheritsched    : int;
 610       schedpolicy     : int;
 611       schedparam      : struct_sched_param;
 612       cputime_clocked_allowed : int;
 613       detatchstate    : int;
 614    end record;
 615    pragma Convention (C, pthread_attr_t);
 616
 617    type pthread_condattr_t is record
 618       flags           : int;
 619       process_shared  : int;
 620    end record;
 621    pragma Convention (C, pthread_condattr_t);
 622
 623    type pthread_mutexattr_t is record
 624       is_initialized  : int;
 625       process_shared  : int;
 626       prio_ceiling    : int;
 627       protocol        : int;
 628       recursive       : int;
 629    end record;
 630    pragma Convention (C, pthread_mutexattr_t);
 631
 632    type pthread_t is new rtems_id;
 633
 634    type pthread_mutex_t is new rtems_id;
 635
 636    type pthread_cond_t is new rtems_id;
 637
 638    type pthread_key_t is new rtems_id;
 639
 640    No_Key : constant pthread_key_t := 0;
 641
 642 end System.OS_Interface;