gcc/ada/libgnarl/s-osinte__lynxos178e.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) 1991-1994, 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 LynxOS-178 Elf (POSIX-8 Threads) version of this package
  34
  35 --  This package encapsulates all direct interfaces to OS services that are
  36 --  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
  43 with Interfaces.C;
  44
  45 with System.Multiprocessors;
  46
  47 package System.OS_Interface is
  48    pragma Preelaborate;
  49
  50    pragma Linker_Options ("-mthreads");
  51    --  Selects the POSIX 1.c runtime, rather than the non-threading runtime or
  52    --  the deprecated legacy threads library.
  53
  54    subtype int            is Interfaces.C.int;
  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    subtype int64          is Interfaces.Integer_64;
  64
  65    -----------
  66    -- Errno --
  67    -----------
  68
  69    function errno return int;
  70    pragma Import (C, errno, "__get_errno");
  71
  72    EAGAIN    : constant := 11;
  73    EINTR     : constant := 4;
  74    EINVAL    : constant := 22;
  75    ENOMEM    : constant := 12;
  76    ETIMEDOUT : constant := 60;
  77    --  Error codes
  78
  79    -------------
  80    -- Signals --
  81    -------------
  82
  83    Max_Interrupt : constant := 63;
  84    --  Max_Interrupt is the number of OS signals, as defined in:
  85    --
  86    --   /usr/include/sys/signal.h
  87    --
  88    --  The lowest numbered signal is 1, but 0 is a valid argument to some
  89    --  library functions, e.g. kill(2). However, 0 is not just another signal:
  90    --  For instance 'I in Signal' and similar should be used with caution.
  91
  92    type Signal is new int range 0 .. Max_Interrupt;
  93    for  Signal'Size use int'Size;
  94
  95    SIGHUP        : constant := 1;  --  hangup
  96    SIGINT        : constant := 2;  --  interrupt (rubout)
  97    SIGQUIT       : constant := 3;  --  quit (ASCD FS)
  98    SIGILL        : constant := 4;  --  illegal instruction (not reset)
  99    SIGTRAP       : constant := 5;  --  trace trap (not reset)
 100    SIGBRK        : constant := 6;  --  break
 101    SIGIOT        : constant := 6;  --  IOT instruction
 102    SIGABRT       : constant := 6;  --  used by abort, replace SIGIOT in future
 103    SIGCORE       : constant := 7;  --  kill with core dump
 104    SIGEMT        : constant := 7;  --  EMT instruction
 105    SIGFPE        : constant := 8;  --  floating point exception
 106    SIGKILL       : constant := 9;  --  kill (cannot be caught or ignored)
 107    SIGBUS        : constant := 10; --  bus error
 108    SIGSEGV       : constant := 11; --  segmentation violation
 109    SIGSYS        : constant := 12; --  bad argument to system call
 110    SIGPIPE       : constant := 13; --  write on a pipe with no one to read it
 111    SIGALRM       : constant := 14; --  alarm clock
 112    SIGTERM       : constant := 15; --  software termination signal from kill
 113    SIGURG        : constant := 16; --  urgent condition on IO channel
 114    SIGSTOP       : constant := 17; --  stop (cannot be caught or ignored)
 115    SIGTSTP       : constant := 18; --  user stop requested from tty
 116    SIGCONT       : constant := 19; --  stopped process has been continued
 117    SIGCLD        : constant := 20; --  alias for SIGCHLD
 118    SIGCHLD       : constant := 20; --  child status change
 119    SIGTTIN       : constant := 21; --  background tty read attempted
 120    SIGTTOU       : constant := 22; --  background tty write attempted
 121    SIGIO         : constant := 23; --  I/O possible (Solaris SIGPOLL alias)
 122    SIGPOLL       : constant := 23; --  pollable event occurred
 123    SIGTHREADKILL : constant := 24; --  Reserved by LynxOS runtime
 124    SIGXCPU       : constant := 24; --  CPU time limit exceeded
 125    SIGXFSZ       : constant := 25; --  filesize limit exceeded
 126    SIGVTALRM     : constant := 26; --  virtual timer expired
 127    SIGPROF       : constant := 27; --  profiling timer expired
 128    SIGWINCH      : constant := 28; --  window size change
 129    SIGLOST       : constant := 29; --  SUN 4.1 compatibility
 130    SIGUSR1       : constant := 30; --  user defined signal 1
 131    SIGUSR2       : constant := 31; --  user defined signal 2
 132
 133    SIGPRIO       : constant := 32;
 134    --  Sent to a process with its priority or group is changed
 135
 136    SIGADAABORT : constant := SIGABRT;
 137    --  Change this if you want to use another signal for task abort. SIGTERM
 138    --  might be a good one.
 139
 140    type Signal_Set is array (Natural range <>) of Signal;
 141
 142    Unmasked    : constant Signal_Set :=
 143      (SIGTRAP, SIGTTIN, SIGTTOU, SIGTSTP, SIGPROF, SIGTHREADKILL);
 144    Reserved    : constant Signal_Set := (SIGABRT, SIGKILL, SIGSTOP, SIGPRIO);
 145
 146    type sigset_t is private;
 147
 148    function sigaddset (set : access sigset_t; sig : Signal) return int;
 149    pragma Import (C, sigaddset, "sigaddset");
 150
 151    function sigdelset (set : access sigset_t; sig : Signal) return int;
 152    pragma Import (C, sigdelset, "sigdelset");
 153
 154    function sigfillset (set : access sigset_t) return int;
 155    pragma Import (C, sigfillset, "sigfillset");
 156
 157    function sigismember (set : access sigset_t; sig : Signal) return int;
 158    pragma Import (C, sigismember, "sigismember");
 159
 160    function sigemptyset (set : access sigset_t) return int;
 161    pragma Import (C, sigemptyset, "sigemptyset");
 162
 163    type struct_sigaction is record
 164       sa_handler   : System.Address;
 165       sa_mask      : sigset_t;
 166       sa_flags     : int;
 167    end record;
 168    pragma Convention (C, struct_sigaction);
 169    type struct_sigaction_ptr is access all struct_sigaction;
 170
 171    SA_SIGINFO : constant := 16#80#;
 172
 173    SA_ONSTACK : constant := 16#00#;
 174    --  SA_ONSTACK is not defined on LynxOS, but it is referred to in the POSIX
 175    --  implementation of System.Interrupt_Management. Therefore we define a
 176    --  dummy value of zero here so that setting this flag is a nop.
 177
 178    SIG_BLOCK   : constant := 0;
 179    SIG_UNBLOCK : constant := 1;
 180    SIG_SETMASK : constant := 2;
 181
 182    SIG_DFL : constant := 0;
 183    SIG_IGN : constant := 1;
 184
 185    function sigaction
 186      (sig  : Signal;
 187       act  : struct_sigaction_ptr;
 188       oact : struct_sigaction_ptr) return int;
 189    pragma Import (C, sigaction, "sigaction");
 190
 191    ----------
 192    -- Time --
 193    ----------
 194
 195    Time_Slice_Supported : constant Boolean := True;
 196    --  Indicates whether time slicing is supported
 197
 198    type timespec is private;
 199
 200    type clockid_t is new int;
 201
 202    function clock_gettime
 203      (clock_id : clockid_t;
 204       tp       : access timespec) return int;
 205    pragma Import (C, clock_gettime, "clock_gettime");
 206
 207    function clock_getres
 208      (clock_id : clockid_t;
 209       res      : access timespec) return int;
 210    pragma Import (C, clock_getres, "clock_getres");
 211
 212    function To_Duration (TS : timespec) return Duration;
 213    pragma Inline (To_Duration);
 214
 215    function To_Timespec (D : Duration) return timespec;
 216    pragma Inline (To_Timespec);
 217
 218    type struct_timezone is record
 219       tz_minuteswest : int;
 220       tz_dsttime     : int;
 221    end record;
 222    pragma Convention (C, struct_timezone);
 223    type struct_timezone_ptr is access all struct_timezone;
 224
 225    type struct_timeval is private;
 226
 227    -------------------------
 228    -- Priority Scheduling --
 229    -------------------------
 230
 231    SCHED_RR    : constant := 16#100_000#;
 232    SCHED_FIFO  : constant := 16#200_000#;
 233    SCHED_OTHER : constant := 16#400_000#;
 234
 235    function To_Target_Priority
 236      (Prio : System.Any_Priority) return Interfaces.C.int;
 237    --  Maps System.Any_Priority to a POSIX priority
 238
 239    -------------
 240    -- Process --
 241    -------------
 242
 243    type pid_t is private;
 244
 245    function kill (pid : pid_t; sig : Signal) return int;
 246    pragma Import (C, kill, "kill");
 247
 248    function getpid return pid_t;
 249    pragma Import (C, getpid, "getpid");
 250
 251    ---------
 252    -- LWP --
 253    ---------
 254
 255    type pthread_t is private;
 256
 257    function lwp_self return pthread_t;
 258    pragma Import (C, lwp_self, "pthread_self");
 259
 260    -------------
 261    -- Threads --
 262    -------------
 263
 264    type Thread_Body is access
 265      function (arg : System.Address) return System.Address;
 266    pragma Convention (C, Thread_Body);
 267
 268    function Thread_Body_Access is new
 269      Ada.Unchecked_Conversion (System.Address, Thread_Body);
 270
 271    subtype Thread_Id        is pthread_t;
 272
 273    type pthread_mutex_t     is limited private;
 274    type pthread_cond_t      is limited private;
 275    type pthread_attr_t      is limited private;
 276    type pthread_mutexattr_t is limited private;
 277    type pthread_condattr_t  is limited private;
 278    type pthread_key_t       is private;
 279
 280    PTHREAD_CREATE_DETACHED : constant := 1;
 281    PTHREAD_CREATE_JOINABLE : constant := 0;
 282
 283    PTHREAD_SCOPE_PROCESS : constant := 0; --  not supported by LynxOS178
 284    PTHREAD_SCOPE_SYSTEM  : constant := 1;
 285
 286    --  Read/Write lock not supported on LynxOS. To add support both types
 287    --  pthread_rwlock_t and pthread_rwlockattr_t must properly be defined
 288    --  with the associated routines pthread_rwlock_[init/destroy] and
 289    --  pthread_rwlock_[rdlock/wrlock/unlock].
 290
 291    subtype pthread_rwlock_t     is pthread_mutex_t;
 292    subtype pthread_rwlockattr_t is pthread_mutexattr_t;
 293
 294    -----------
 295    -- Stack --
 296    -----------
 297
 298    type stack_t is record
 299       ss_sp    : System.Address;
 300       ss_flags : int;
 301       ss_size  : size_t;
 302    end record;
 303    pragma Convention (C, stack_t);
 304
 305    function sigaltstack
 306      (ss  : not null access stack_t;
 307       oss : access stack_t) return int;
 308    pragma Import (C, sigaltstack, "sigaltstack");
 309    --  Neither stack_t nor sigaltstack are available on LynxOS-178
 310
 311    Alternate_Stack : aliased System.Address;
 312    --  This is a dummy definition, never used (Alternate_Stack_Size is 0)
 313
 314    Alternate_Stack_Size : constant := 0;
 315    --  No alternate signal stack is used on this platform
 316
 317    Stack_Base_Available : constant Boolean := False;
 318    --  Indicates whether the stack base is available on this target
 319
 320    function Get_Stack_Base (thread : pthread_t) return Address;
 321    pragma Inline (Get_Stack_Base);
 322    --  Returns the stack base of the specified thread. Only call this function
 323    --  when Stack_Base_Available is True.
 324
 325    function Get_Page_Size return int;
 326    --  Returns the size of a page in bytes
 327
 328    PROT_NONE  : constant := 1;
 329    PROT_READ  : constant := 2;
 330    PROT_WRITE : constant := 4;
 331    PROT_EXEC  : constant := 8;
 332    PROT_ALL   : constant := PROT_READ + PROT_WRITE + PROT_EXEC;
 333
 334    PROT_ON    : constant := PROT_READ;
 335    PROT_OFF   : constant := PROT_ALL;
 336
 337    function mprotect (addr : Address; len : size_t; prot : int) return int;
 338    pragma Import (C, mprotect);
 339
 340    ---------------------------------------
 341    -- Nonstandard Thread Initialization --
 342    ---------------------------------------
 343
 344    procedure pthread_init;
 345    --  This is a dummy procedure to share some GNULLI files
 346
 347    -------------------------
 348    -- POSIX.1c  Section 3 --
 349    -------------------------
 350    function sigwait
 351      (set : access sigset_t;
 352       sig : access Signal) return int;
 353    pragma Inline (sigwait);
 354    --  LynxOS has non standard sigwait
 355
 356    function pthread_kill
 357      (thread : pthread_t;
 358       sig    : Signal) return int;
 359    pragma Import (C, pthread_kill, "pthread_kill");
 360
 361    function pthread_sigmask
 362      (how  : int;
 363       set  : access sigset_t;
 364       oset : access sigset_t) return int;
 365    pragma Import (C, pthread_sigmask, "pthread_sigmask");
 366
 367    ----------------------------
 368    --  POSIX.1c  Section 11  --
 369    ----------------------------
 370
 371    function pthread_mutexattr_init
 372      (attr : access pthread_mutexattr_t) return int;
 373    pragma Import (C, pthread_mutexattr_init, "pthread_mutexattr_init");
 374
 375    function pthread_mutexattr_destroy
 376      (attr : access pthread_mutexattr_t) return int;
 377    pragma Import (C, pthread_mutexattr_destroy, "pthread_mutexattr_destroy");
 378
 379    function pthread_mutex_init
 380      (mutex : access pthread_mutex_t;
 381       attr  : access pthread_mutexattr_t) return int;
 382    pragma Import (C, pthread_mutex_init, "pthread_mutex_init");
 383
 384    function pthread_mutex_destroy (mutex : access pthread_mutex_t) return int;
 385    pragma Import (C, pthread_mutex_destroy, "pthread_mutex_destroy");
 386
 387    function pthread_mutex_lock (mutex : access pthread_mutex_t) return int;
 388    pragma Import (C, pthread_mutex_lock, "pthread_mutex_lock");
 389
 390    function pthread_mutex_unlock (mutex : access pthread_mutex_t) return int;
 391    pragma Import (C, pthread_mutex_unlock, "pthread_mutex_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    --------------------------
 424    -- POSIX.1c  Section 13 --
 425    --------------------------
 426
 427    PTHREAD_PRIO_NONE    : constant := 0;
 428    PTHREAD_PRIO_INHERIT : constant := 1;
 429    PTHREAD_PRIO_PROTECT : constant := 2;
 430
 431    function pthread_mutexattr_setprotocol
 432      (attr     : access pthread_mutexattr_t;
 433       protocol : int) return int;
 434    pragma Import (C, pthread_mutexattr_setprotocol);
 435
 436    function pthread_mutexattr_setprioceiling
 437      (attr        : access pthread_mutexattr_t;
 438       prioceiling : int) return int;
 439    pragma Import (C, pthread_mutexattr_setprioceiling);
 440
 441    type struct_sched_param is record
 442       sched_priority        : int;
 443    end record;
 444    pragma Convention (C, struct_sched_param);
 445
 446    function pthread_setschedparam
 447      (thread : pthread_t;
 448       policy : int;
 449       param  : access struct_sched_param) return int;
 450    pragma Import (C, pthread_setschedparam, "pthread_setschedparam");
 451
 452    function pthread_attr_setscope
 453      (Unused_attr            : access pthread_attr_t;
 454       Unused_contentionscope : int) return int is (0);
 455    --  pthread_attr_setscope is not implemented in production mode
 456
 457    function pthread_attr_setinheritsched
 458      (attr         : access pthread_attr_t;
 459       inheritsched : int) return int;
 460    pragma Import (C, pthread_attr_setinheritsched);
 461
 462    function pthread_attr_setschedpolicy
 463      (attr   : access pthread_attr_t;
 464       policy : int) return int;
 465    pragma Import (C, pthread_attr_setschedpolicy);
 466
 467    function sched_yield return int;
 468    pragma Import (C, sched_yield, "sched_yield");
 469
 470    --------------------------
 471    -- P1003.1c  Section 16 --
 472    --------------------------
 473
 474    function pthread_attr_init (attributes : access pthread_attr_t) return int;
 475    pragma Import (C, pthread_attr_init, "pthread_attr_init");
 476
 477    function pthread_attr_destroy
 478      (attributes : access pthread_attr_t) return int;
 479    pragma Import (C, pthread_attr_destroy, "pthread_attr_destroy");
 480
 481    function pthread_attr_setdetachstate
 482      (attr        : access pthread_attr_t;
 483       detachstate : int) return int;
 484    pragma Import (C, pthread_attr_setdetachstate);
 485
 486    function pthread_attr_setstacksize
 487      (attr      : access pthread_attr_t;
 488       stacksize : size_t) return int;
 489    pragma Import (C, pthread_attr_setstacksize);
 490
 491    function pthread_create
 492      (thread        : access pthread_t;
 493       attributes    : access pthread_attr_t;
 494       start_routine : Thread_Body;
 495       arg           : System.Address) return int;
 496    pragma Import (C, pthread_create, "pthread_create");
 497
 498    procedure pthread_exit (status : System.Address);
 499    pragma Import (C, pthread_exit, "pthread_exit");
 500
 501    function pthread_self return pthread_t;
 502    pragma Import (C, pthread_self, "pthread_self");
 503
 504    --------------------------
 505    -- POSIX.1c  Section 17 --
 506    --------------------------
 507
 508    function pthread_setspecific
 509      (key   : pthread_key_t;
 510       value : System.Address) return int;
 511    pragma Import (C, pthread_setspecific, "pthread_setspecific");
 512
 513    function pthread_getspecific
 514      (key    : pthread_key_t) return System.Address;
 515    pragma Import (C, pthread_getspecific, "pthread_getspecific");
 516
 517    type destructor_pointer is access procedure (arg : System.Address);
 518    pragma Convention (C, destructor_pointer);
 519
 520    function pthread_key_create
 521      (key        : access pthread_key_t;
 522       destructor : destructor_pointer
 523      ) return int;
 524    pragma Import (C, pthread_key_create, "pthread_key_create");
 525
 526    ---------------------
 527    -- Multiprocessors --
 528    ---------------------
 529
 530    function Current_CPU return Multiprocessors.CPU;
 531    --  Return the id of the current CPU
 532
 533    function Get_Affinity (Id : Thread_Id) return Multiprocessors.CPU_Range;
 534    --  Return CPU affinity of the given thread (maybe Not_A_Specific_CPU)
 535
 536    function Get_CPU (Id : Thread_Id) return Multiprocessors.CPU;
 537    --  Return the CPU in charge of the given thread (always a valid CPU)
 538
 539 private
 540
 541    type sigset_t is array (1 .. 2) of long;
 542    pragma Convention (C, sigset_t);
 543
 544    type pid_t is new long;
 545
 546    type time_t is new int64;
 547
 548    type suseconds_t is new int;
 549
 550    type timespec is record
 551       tv_sec  : time_t;
 552       tv_nsec : long;
 553    end record;
 554    pragma Convention (C, timespec);
 555
 556    type struct_timeval is record
 557       tv_sec  : time_t;
 558       tv_usec : suseconds_t;
 559    end record;
 560    pragma Convention (C, struct_timeval);
 561
 562    type st_attr is record
 563       stksize      : int;
 564       prio         : int;
 565       inheritsched : int;
 566       state        : int;
 567       sched        : int;
 568       detachstate  : int;
 569       guardsize    : int;
 570    end record;
 571    pragma Convention (C, st_attr);
 572    subtype st_attr_t is st_attr;
 573
 574    type pthread_attr_t is record
 575       pthread_attr_magic : unsigned;
 576       st                 : st_attr_t;
 577       pthread_attr_scope : int;
 578    end record;
 579    pragma Convention (C, pthread_attr_t);
 580
 581    type pthread_condattr_t is record
 582       cv_magic   : unsigned;
 583       cv_pshared : unsigned;
 584    end record;
 585    pragma Convention (C, pthread_condattr_t);
 586
 587    type pthread_mutexattr_t is record
 588       m_flags   : unsigned;
 589       m_prio_c  : int;
 590       m_pshared : int;
 591    end record;
 592    pragma Convention (C, pthread_mutexattr_t);
 593
 594    type tid_t is new short;
 595    type pthread_t is new tid_t;
 596
 597    type block_obj_t is record
 598       b_head : int;
 599    end record;
 600    pragma Convention (C, block_obj_t);
 601
 602    type pthread_mutex_t is record
 603       m_flags      : unsigned;
 604       m_owner      : tid_t;
 605       m_wait       : block_obj_t;
 606       m_prio_c     : int;
 607       m_oldprio    : int;
 608       m_count      : int;
 609       m_referenced : int;
 610    end record;
 611    pragma Convention (C, pthread_mutex_t);
 612    type pthread_mutex_t_ptr is access all pthread_mutex_t;
 613
 614    type pthread_cond_t is record
 615       cv_magic   : unsigned;
 616       cv_wait    : block_obj_t;
 617       cv_mutex   : pthread_mutex_t_ptr;
 618       cv_refcnt  : int;
 619    end record;
 620    pragma Convention (C, pthread_cond_t);
 621
 622    type pthread_key_t is new int;
 623
 624 end System.OS_Interface;