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) 1995-2024, 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 with System.Parameters;
  47
  48 package System.OS_Interface is
  49    pragma Preelaborate;
  50
  51    subtype int            is Interfaces.C.int;
  52    subtype short          is Interfaces.C.short;
  53    subtype long           is Interfaces.C.long;
  54    subtype unsigned       is Interfaces.C.unsigned;
  55    subtype unsigned_short is Interfaces.C.unsigned_short;
  56    subtype unsigned_long  is Interfaces.C.unsigned_long;
  57    subtype unsigned_char  is Interfaces.C.unsigned_char;
  58    subtype plain_char     is Interfaces.C.plain_char;
  59    subtype size_t         is Interfaces.C.size_t;
  60    subtype int64          is Interfaces.Integer_64;
  61
  62    -----------
  63    -- Errno --
  64    -----------
  65
  66    function errno return int;
  67    pragma Import (C, errno, "__get_errno");
  68
  69    EAGAIN    : constant := 11;
  70    EINTR     : constant := 4;
  71    EINVAL    : constant := 22;
  72    ENOMEM    : constant := 12;
  73    ETIMEDOUT : constant := 60;
  74    --  Error codes
  75
  76    -------------
  77    -- Signals --
  78    -------------
  79
  80    Max_Interrupt : constant := 63;
  81    --  Max_Interrupt is the number of OS signals, as defined in:
  82    --
  83    --   /usr/include/sys/signal.h
  84    --
  85    --  The lowest numbered signal is 1, but 0 is a valid argument to some
  86    --  library functions, e.g. kill(2). However, 0 is not just another signal:
  87    --  For instance 'I in Signal' and similar should be used with caution.
  88
  89    type Signal is new int range 0 .. Max_Interrupt;
  90    for  Signal'Size use int'Size;
  91
  92    SIGHUP        : constant := 1;  --  hangup
  93    SIGINT        : constant := 2;  --  interrupt (rubout)
  94    SIGQUIT       : constant := 3;  --  quit (ASCD FS)
  95    SIGILL        : constant := 4;  --  illegal instruction (not reset)
  96    SIGTRAP       : constant := 5;  --  trace trap (not reset)
  97    SIGBRK        : constant := 6;  --  break
  98    SIGIOT        : constant := 6;  --  IOT instruction
  99    SIGABRT       : constant := 6;  --  used by abort, replace SIGIOT in future
 100    SIGCORE       : constant := 7;  --  kill with core dump
 101    SIGEMT        : constant := 7;  --  EMT instruction
 102    SIGFPE        : constant := 8;  --  floating point exception
 103    SIGKILL       : constant := 9;  --  kill (cannot be caught or ignored)
 104    SIGBUS        : constant := 10; --  bus error
 105    SIGSEGV       : constant := 11; --  segmentation violation
 106    SIGSYS        : constant := 12; --  bad argument to system call
 107    SIGPIPE       : constant := 13; --  write on a pipe with no one to read it
 108    SIGALRM       : constant := 14; --  alarm clock
 109    SIGTERM       : constant := 15; --  software termination signal from kill
 110    SIGURG        : constant := 16; --  urgent condition on IO channel
 111    SIGSTOP       : constant := 17; --  stop (cannot be caught or ignored)
 112    SIGTSTP       : constant := 18; --  user stop requested from tty
 113    SIGCONT       : constant := 19; --  stopped process has been continued
 114    SIGCLD        : constant := 20; --  alias for SIGCHLD
 115    SIGCHLD       : constant := 20; --  child status change
 116    SIGTTIN       : constant := 21; --  background tty read attempted
 117    SIGTTOU       : constant := 22; --  background tty write attempted
 118    SIGIO         : constant := 23; --  I/O possible (Solaris SIGPOLL alias)
 119    SIGPOLL       : constant := 23; --  pollable event occurred
 120    SIGTHREADKILL : constant := 24; --  Reserved by LynxOS runtime
 121    SIGXCPU       : constant := 24; --  CPU time limit exceeded
 122    SIGXFSZ       : constant := 25; --  filesize limit exceeded
 123    SIGVTALRM     : constant := 26; --  virtual timer expired
 124    SIGPROF       : constant := 27; --  profiling timer expired
 125    SIGWINCH      : constant := 28; --  window size change
 126    SIGLOST       : constant := 29; --  SUN 4.1 compatibility
 127    SIGUSR1       : constant := 30; --  user defined signal 1
 128    SIGUSR2       : constant := 31; --  user defined signal 2
 129
 130    SIGPRIO       : constant := 32;
 131    --  Sent to a process with its priority or group is changed
 132
 133    SIGADAABORT : constant := SIGABRT;
 134    --  Change this if you want to use another signal for task abort. SIGTERM
 135    --  might be a good one.
 136
 137    type Signal_Set is array (Natural range <>) of Signal;
 138
 139    Unmasked    : constant Signal_Set :=
 140      (SIGTRAP, SIGTTIN, SIGTTOU, SIGTSTP, SIGPROF, SIGTHREADKILL);
 141    Reserved    : constant Signal_Set := (SIGABRT, SIGKILL, SIGSTOP, SIGPRIO);
 142
 143    type sigset_t is private;
 144
 145    function sigaddset (set : access sigset_t; sig : Signal) return int;
 146    pragma Import (C, sigaddset, "sigaddset");
 147
 148    function sigdelset (set : access sigset_t; sig : Signal) return int;
 149    pragma Import (C, sigdelset, "sigdelset");
 150
 151    function sigfillset (set : access sigset_t) return int;
 152    pragma Import (C, sigfillset, "sigfillset");
 153
 154    function sigismember (set : access sigset_t; sig : Signal) return int;
 155    pragma Import (C, sigismember, "sigismember");
 156
 157    function sigemptyset (set : access sigset_t) return int;
 158    pragma Import (C, sigemptyset, "sigemptyset");
 159
 160    type struct_sigaction is record
 161       sa_handler   : System.Address;
 162       sa_mask      : sigset_t;
 163       sa_flags     : int;
 164    end record;
 165    pragma Convention (C, struct_sigaction);
 166    type struct_sigaction_ptr is access all struct_sigaction;
 167
 168    SA_SIGINFO : constant := 16#80#;
 169
 170    SA_ONSTACK : constant := 16#00#;
 171    --  SA_ONSTACK is not defined on LynxOS, but it is referred to in the POSIX
 172    --  implementation of System.Interrupt_Management. Therefore we define a
 173    --  dummy value of zero here so that setting this flag is a nop.
 174
 175    SIG_BLOCK   : constant := 0;
 176    SIG_UNBLOCK : constant := 1;
 177    SIG_SETMASK : constant := 2;
 178
 179    SIG_DFL : constant := 0;
 180    SIG_IGN : constant := 1;
 181
 182    function sigaction
 183      (sig  : Signal;
 184       act  : struct_sigaction_ptr;
 185       oact : struct_sigaction_ptr) return int;
 186    pragma Import (C, sigaction, "sigaction");
 187
 188    ----------
 189    -- Time --
 190    ----------
 191
 192    Time_Slice_Supported : constant Boolean := True;
 193    --  Indicates whether time slicing is supported
 194
 195    type timespec is private;
 196
 197    type clockid_t is new int;
 198
 199    function clock_gettime
 200      (clock_id : clockid_t;
 201       tp       : access timespec) return int;
 202    pragma Import (C, clock_gettime, "clock_gettime");
 203
 204    function clock_getres
 205      (clock_id : clockid_t;
 206       res      : access timespec) return int;
 207    pragma Import (C, clock_getres, "clock_getres");
 208
 209    function To_Duration (TS : timespec) return Duration;
 210    pragma Inline (To_Duration);
 211
 212    function To_Timespec (D : Duration) return timespec;
 213    pragma Inline (To_Timespec);
 214
 215    type struct_timezone is record
 216       tz_minuteswest : int;
 217       tz_dsttime     : int;
 218    end record;
 219    pragma Convention (C, struct_timezone);
 220    type struct_timezone_ptr is access all struct_timezone;
 221
 222    type struct_timeval is private;
 223
 224    -------------------------
 225    -- Priority Scheduling --
 226    -------------------------
 227
 228    SCHED_RR    : constant := 16#100_000#;
 229    SCHED_FIFO  : constant := 16#200_000#;
 230    SCHED_OTHER : constant := 16#400_000#;
 231
 232    function To_Target_Priority
 233      (Prio : System.Any_Priority) return Interfaces.C.int;
 234    --  Maps System.Any_Priority to a POSIX priority
 235
 236    -------------
 237    -- Process --
 238    -------------
 239
 240    type pid_t is private;
 241
 242    function kill (pid : pid_t; sig : Signal) return int;
 243    pragma Import (C, kill, "kill");
 244
 245    function getpid return pid_t;
 246    pragma Import (C, getpid, "getpid");
 247
 248    ---------
 249    -- LWP --
 250    ---------
 251
 252    type pthread_t is private;
 253
 254    function lwp_self return pthread_t;
 255    pragma Import (C, lwp_self, "pthread_self");
 256
 257    -------------
 258    -- Threads --
 259    -------------
 260
 261    type Thread_Body is access
 262      function (arg : System.Address) return System.Address;
 263    pragma Convention (C, Thread_Body);
 264
 265    function Thread_Body_Access is new
 266      Ada.Unchecked_Conversion (System.Address, Thread_Body);
 267
 268    subtype Thread_Id        is pthread_t;
 269
 270    type pthread_mutex_t     is limited private;
 271    type pthread_cond_t      is limited private;
 272    type pthread_attr_t      is limited private;
 273    type pthread_mutexattr_t is limited private;
 274    type pthread_condattr_t  is limited private;
 275    type pthread_key_t       is private;
 276
 277    PTHREAD_CREATE_DETACHED : constant := 1;
 278    PTHREAD_CREATE_JOINABLE : constant := 0;
 279
 280    PTHREAD_SCOPE_PROCESS : constant := 0; --  not supported by LynxOS178
 281    PTHREAD_SCOPE_SYSTEM  : constant := 1;
 282
 283    --  Read/Write lock not supported on LynxOS. To add support both types
 284    --  pthread_rwlock_t and pthread_rwlockattr_t must properly be defined
 285    --  with the associated routines pthread_rwlock_[init/destroy] and
 286    --  pthread_rwlock_[rdlock/wrlock/unlock].
 287
 288    subtype pthread_rwlock_t     is pthread_mutex_t;
 289    subtype pthread_rwlockattr_t is pthread_mutexattr_t;
 290
 291    -----------
 292    -- Stack --
 293    -----------
 294
 295    type stack_t is record
 296       ss_sp    : System.Address;
 297       ss_flags : int;
 298       ss_size  : size_t;
 299    end record;
 300    pragma Convention (C, stack_t);
 301
 302    function sigaltstack
 303      (ss  : not null access stack_t;
 304       oss : access stack_t) return int;
 305    pragma Import (C, sigaltstack, "sigaltstack");
 306    --  Neither stack_t nor sigaltstack are available on LynxOS-178
 307
 308    Alternate_Stack : aliased System.Address;
 309    --  This is a dummy definition, never used (Alternate_Stack_Size is 0)
 310
 311    Alternate_Stack_Size : constant := 0;
 312    --  No alternate signal stack is used on this platform
 313
 314    Stack_Base_Available : constant Boolean := False;
 315    --  Indicates whether the stack base is available on this target
 316
 317    function Get_Stack_Base (thread : pthread_t) return Address;
 318    pragma Inline (Get_Stack_Base);
 319    --  Returns the stack base of the specified thread. Only call this function
 320    --  when Stack_Base_Available is True.
 321
 322    function Get_Page_Size return int;
 323    --  Returns the size of a page in bytes
 324
 325    PROT_NONE  : constant := 1;
 326    PROT_READ  : constant := 2;
 327    PROT_WRITE : constant := 4;
 328    PROT_EXEC  : constant := 8;
 329    PROT_ALL   : constant := PROT_READ + PROT_WRITE + PROT_EXEC;
 330
 331    PROT_ON    : constant := PROT_READ;
 332    PROT_OFF   : constant := PROT_ALL;
 333
 334    function mprotect (addr : Address; len : size_t; prot : int) return int;
 335    pragma Import (C, mprotect);
 336
 337    ---------------------------------------
 338    -- Nonstandard Thread Initialization --
 339    ---------------------------------------
 340
 341    procedure pthread_init;
 342    --  This is a dummy procedure to share some GNULLI files
 343
 344    -------------------------
 345    -- POSIX.1c  Section 3 --
 346    -------------------------
 347    function sigwait
 348      (set : access sigset_t;
 349       sig : access Signal) return int;
 350    pragma Inline (sigwait);
 351    --  LynxOS has non standard sigwait
 352
 353    function pthread_kill
 354      (thread : pthread_t;
 355       sig    : Signal) return int;
 356    pragma Import (C, pthread_kill, "pthread_kill");
 357
 358    function pthread_sigmask
 359      (how  : int;
 360       set  : access sigset_t;
 361       oset : access sigset_t) return int;
 362    pragma Import (C, pthread_sigmask, "pthread_sigmask");
 363
 364    ----------------------------
 365    --  POSIX.1c  Section 11  --
 366    ----------------------------
 367
 368    function pthread_mutexattr_init
 369      (attr : access pthread_mutexattr_t) return int;
 370    pragma Import (C, pthread_mutexattr_init, "pthread_mutexattr_init");
 371
 372    function pthread_mutexattr_destroy
 373      (attr : access pthread_mutexattr_t) return int;
 374    pragma Import (C, pthread_mutexattr_destroy, "pthread_mutexattr_destroy");
 375
 376    function pthread_mutex_init
 377      (mutex : access pthread_mutex_t;
 378       attr  : access pthread_mutexattr_t) return int;
 379    pragma Import (C, pthread_mutex_init, "pthread_mutex_init");
 380
 381    function pthread_mutex_destroy (mutex : access pthread_mutex_t) return int;
 382    pragma Import (C, pthread_mutex_destroy, "pthread_mutex_destroy");
 383
 384    function pthread_mutex_lock (mutex : access pthread_mutex_t) return int;
 385    pragma Import (C, pthread_mutex_lock, "pthread_mutex_lock");
 386
 387    function pthread_mutex_unlock (mutex : access pthread_mutex_t) return int;
 388    pragma Import (C, pthread_mutex_unlock, "pthread_mutex_unlock");
 389
 390    function pthread_condattr_init
 391      (attr : access pthread_condattr_t) return int;
 392    pragma Import (C, pthread_condattr_init, "pthread_condattr_init");
 393
 394    function pthread_condattr_destroy
 395      (attr : access pthread_condattr_t) return int;
 396    pragma Import (C, pthread_condattr_destroy, "pthread_condattr_destroy");
 397
 398    function pthread_cond_init
 399      (cond : access pthread_cond_t;
 400       attr : access pthread_condattr_t) return int;
 401    pragma Import (C, pthread_cond_init, "pthread_cond_init");
 402
 403    function pthread_cond_destroy (cond : access pthread_cond_t) return int;
 404    pragma Import (C, pthread_cond_destroy, "pthread_cond_destroy");
 405
 406    function pthread_cond_signal (cond : access pthread_cond_t) return int;
 407    pragma Import (C, pthread_cond_signal, "pthread_cond_signal");
 408
 409    function pthread_cond_wait
 410      (cond  : access pthread_cond_t;
 411       mutex : access pthread_mutex_t) return int;
 412    pragma Import (C, pthread_cond_wait, "pthread_cond_wait");
 413
 414    function pthread_cond_timedwait
 415      (cond    : access pthread_cond_t;
 416       mutex   : access pthread_mutex_t;
 417       abstime : access timespec) return int;
 418    pragma Import (C, pthread_cond_timedwait, "pthread_cond_timedwait");
 419
 420    --------------------------
 421    -- POSIX.1c  Section 13 --
 422    --------------------------
 423
 424    PTHREAD_PRIO_NONE    : constant := 0;
 425    PTHREAD_PRIO_INHERIT : constant := 1;
 426    PTHREAD_PRIO_PROTECT : constant := 2;
 427
 428    function pthread_mutexattr_setprotocol
 429      (attr     : access pthread_mutexattr_t;
 430       protocol : int) return int;
 431    pragma Import (C, pthread_mutexattr_setprotocol);
 432
 433    function pthread_mutexattr_setprioceiling
 434      (attr        : access pthread_mutexattr_t;
 435       prioceiling : int) return int;
 436    pragma Import (C, pthread_mutexattr_setprioceiling);
 437
 438    type struct_sched_param is record
 439       sched_priority        : int;
 440    end record;
 441    pragma Convention (C, struct_sched_param);
 442
 443    function pthread_setschedparam
 444      (thread : pthread_t;
 445       policy : int;
 446       param  : access struct_sched_param) return int;
 447    pragma Import (C, pthread_setschedparam, "pthread_setschedparam");
 448
 449    function pthread_attr_setscope
 450      (Unused_attr            : access pthread_attr_t;
 451       Unused_contentionscope : int) return int is (0);
 452    --  pthread_attr_setscope is not implemented in production mode
 453
 454    function pthread_attr_setinheritsched
 455      (attr         : access pthread_attr_t;
 456       inheritsched : int) return int;
 457    pragma Import (C, pthread_attr_setinheritsched);
 458
 459    function pthread_attr_setschedpolicy
 460      (attr   : access pthread_attr_t;
 461       policy : int) return int;
 462    pragma Import (C, pthread_attr_setschedpolicy);
 463
 464    function sched_yield return int;
 465    pragma Import (C, sched_yield, "sched_yield");
 466
 467    --------------------------
 468    -- P1003.1c  Section 16 --
 469    --------------------------
 470
 471    function pthread_attr_init (attributes : access pthread_attr_t) return int;
 472    pragma Import (C, pthread_attr_init, "pthread_attr_init");
 473
 474    function pthread_attr_destroy
 475      (attributes : access pthread_attr_t) return int;
 476    pragma Import (C, pthread_attr_destroy, "pthread_attr_destroy");
 477
 478    function pthread_attr_setdetachstate
 479      (attr        : access pthread_attr_t;
 480       detachstate : int) return int;
 481    pragma Import (C, pthread_attr_setdetachstate);
 482
 483    function pthread_attr_setstacksize
 484      (attr      : access pthread_attr_t;
 485       stacksize : size_t) return int;
 486    pragma Import (C, pthread_attr_setstacksize);
 487
 488    function pthread_create
 489      (thread        : access pthread_t;
 490       attributes    : access pthread_attr_t;
 491       start_routine : Thread_Body;
 492       arg           : System.Address) return int;
 493    pragma Import (C, pthread_create, "pthread_create");
 494
 495    procedure pthread_exit (status : System.Address);
 496    pragma Import (C, pthread_exit, "pthread_exit");
 497
 498    function pthread_self return pthread_t;
 499    pragma Import (C, pthread_self, "pthread_self");
 500
 501    --------------------------
 502    -- POSIX.1c  Section 17 --
 503    --------------------------
 504
 505    function pthread_setspecific
 506      (key   : pthread_key_t;
 507       value : System.Address) return int;
 508    pragma Import (C, pthread_setspecific, "pthread_setspecific");
 509
 510    function pthread_getspecific
 511      (key    : pthread_key_t) return System.Address;
 512    pragma Import (C, pthread_getspecific, "pthread_getspecific");
 513
 514    type destructor_pointer is access procedure (arg : System.Address);
 515    pragma Convention (C, destructor_pointer);
 516
 517    function pthread_key_create
 518      (key        : access pthread_key_t;
 519       destructor : destructor_pointer
 520      ) return int;
 521    pragma Import (C, pthread_key_create, "pthread_key_create");
 522
 523    ---------------------
 524    -- Multiprocessors --
 525    ---------------------
 526
 527    function Current_CPU return Multiprocessors.CPU;
 528    --  Return the id of the current CPU
 529
 530    function Get_Affinity (Id : Thread_Id) return Multiprocessors.CPU_Range;
 531    --  Return CPU affinity of the given thread (maybe Not_A_Specific_CPU)
 532
 533    function Get_CPU (Id : Thread_Id) return Multiprocessors.CPU;
 534    --  Return the CPU in charge of the given thread (always a valid CPU)
 535
 536 private
 537
 538    type sigset_t is array (1 .. 2) of long;
 539    pragma Convention (C, sigset_t);
 540
 541    type pid_t is new long;
 542
 543    type time_t is range -2 ** (System.Parameters.time_t_bits - 1)
 544      .. 2 ** (System.Parameters.time_t_bits - 1) - 1;
 545
 546    type suseconds_t is new int;
 547
 548    type timespec is record
 549       tv_sec  : time_t;
 550       tv_nsec : long;
 551    end record;
 552    pragma Convention (C, timespec);
 553
 554    type struct_timeval is record
 555       tv_sec  : time_t;
 556       tv_usec : suseconds_t;
 557    end record;
 558    pragma Convention (C, struct_timeval);
 559
 560    type st_attr is record
 561       stksize      : int;
 562       prio         : int;
 563       inheritsched : int;
 564       state        : int;
 565       sched        : int;
 566       detachstate  : int;
 567       guardsize    : int;
 568    end record;
 569    pragma Convention (C, st_attr);
 570    subtype st_attr_t is st_attr;
 571
 572    type pthread_attr_t is record
 573       pthread_attr_magic : unsigned;
 574       st                 : st_attr_t;
 575       pthread_attr_scope : int;
 576    end record;
 577    pragma Convention (C, pthread_attr_t);
 578
 579    type pthread_condattr_t is record
 580       cv_magic   : unsigned;
 581       cv_pshared : unsigned;
 582    end record;
 583    pragma Convention (C, pthread_condattr_t);
 584
 585    type pthread_mutexattr_t is record
 586       m_flags   : unsigned;
 587       m_prio_c  : int;
 588       m_pshared : int;
 589    end record;
 590    pragma Convention (C, pthread_mutexattr_t);
 591
 592    type tid_t is new short;
 593    type pthread_t is new tid_t;
 594
 595    type block_obj_t is record
 596       b_head : int;
 597    end record;
 598    pragma Convention (C, block_obj_t);
 599
 600    type pthread_mutex_t is record
 601       m_flags      : unsigned;
 602       m_owner      : tid_t;
 603       m_wait       : block_obj_t;
 604       m_prio_c     : int;
 605       m_oldprio    : int;
 606       m_count      : int;
 607       m_referenced : int;
 608    end record;
 609    pragma Convention (C, pthread_mutex_t);
 610    type pthread_mutex_t_ptr is access all pthread_mutex_t;
 611
 612    type pthread_cond_t is record
 613       cv_magic   : unsigned;
 614       cv_wait    : block_obj_t;
 615       cv_mutex   : pthread_mutex_t_ptr;
 616       cv_refcnt  : int;
 617    end record;
 618    pragma Convention (C, pthread_cond_t);
 619
 620    type pthread_key_t is new int;
 621
 622 end System.OS_Interface;