gcc/ada/5tosinte.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) 1997-2002, 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 2,  or (at your option) any later ver- --
  14 -- sion. GNARL 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.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNARL; see file COPYING.  If not, write --
  19 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  20 -- MA 02111-1307, USA.                                                      --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNARL was developed by the GNARL team at Florida State University.       --
  30 -- Extensive contributions were provided by Ada Core Technologies, Inc.     --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 --  This is a Solaris (FSU THREADS) version of this package.
  35
  36 --  This package includes all direct interfaces to OS services
  37 --  that are needed by children of System.
  38
  39 --  PLEASE DO NOT add any with-clauses to this package
  40 --  or remove the pragma Elaborate_Body.
  41 --  It is designed to be a bottom-level (leaf) package.
  42
  43 with Interfaces.C;
  44 package System.OS_Interface is
  45    pragma Preelaborate;
  46
  47    pragma Linker_Options ("-lgthreads");
  48    pragma Linker_Options ("-lmalloc");
  49
  50    subtype int            is Interfaces.C.int;
  51    subtype short          is Interfaces.C.short;
  52    subtype long           is Interfaces.C.long;
  53    subtype unsigned       is Interfaces.C.unsigned;
  54    subtype unsigned_short is Interfaces.C.unsigned_short;
  55    subtype unsigned_long  is Interfaces.C.unsigned_long;
  56    subtype unsigned_char  is Interfaces.C.unsigned_char;
  57    subtype plain_char     is Interfaces.C.plain_char;
  58    subtype size_t         is Interfaces.C.size_t;
  59
  60    -----------
  61    -- Errno --
  62    -----------
  63
  64    function errno return int;
  65    pragma Import (C, errno, "__get_errno");
  66
  67    EAGAIN    : constant := 11;
  68    EINTR     : constant := 4;
  69    EINVAL    : constant := 22;
  70    ENOMEM    : constant := 12;
  71    ETIMEDOUT : constant := 145;
  72
  73    -------------
  74    -- Signals --
  75    -------------
  76
  77    Max_Interrupt : constant := 45;
  78    type Signal is new int range 0 .. Max_Interrupt;
  79    for Signal'Size use int'Size;
  80
  81    SIGHUP     : constant := 1; --  hangup
  82    SIGINT     : constant := 2; --  interrupt (rubout)
  83    SIGQUIT    : constant := 3; --  quit (ASCD FS)
  84    SIGILL     : constant := 4; --  illegal instruction (not reset)
  85    SIGTRAP    : constant := 5; --  trace trap (not reset)
  86    SIGIOT     : constant := 6; --  IOT instruction
  87    SIGABRT    : constant := 6; --  used by abort, replace SIGIOT in the  future
  88    SIGEMT     : constant := 7; --  EMT instruction
  89    SIGFPE     : constant := 8; --  floating point exception
  90    SIGKILL    : constant := 9; --  kill (cannot be caught or ignored)
  91    SIGBUS     : constant := 10; --  bus error
  92    SIGSEGV    : constant := 11; --  segmentation violation
  93    SIGSYS     : constant := 12; --  bad argument to system call
  94    SIGPIPE    : constant := 13; --  write on a pipe with no one to read it
  95    SIGALRM    : constant := 14; --  alarm clock
  96    SIGTERM    : constant := 15; --  software termination signal from kill
  97    SIGUSR1    : constant := 16; --  user defined signal 1
  98    SIGUSR2    : constant := 17; --  user defined signal 2
  99    SIGCLD     : constant := 18; --  alias for SIGCHLD
 100    SIGCHLD    : constant := 18; --  child status change
 101    SIGPWR     : constant := 19; --  power-fail restart
 102    SIGWINCH   : constant := 20; --  window size change
 103    SIGURG     : constant := 21; --  urgent condition on IO channel
 104    SIGPOLL    : constant := 22; --  pollable event occurred
 105    SIGIO      : constant := 22; --  I/O possible (Solaris SIGPOLL alias)
 106    SIGSTOP    : constant := 23; --  stop (cannot be caught or ignored)
 107    SIGTSTP    : constant := 24; --  user stop requested from tty
 108    SIGCONT    : constant := 25; --  stopped process has been continued
 109    SIGTTIN    : constant := 26; --  background tty read attempted
 110    SIGTTOU    : constant := 27; --  background tty write attempted
 111    SIGVTALRM  : constant := 28; --  virtual timer expired
 112    SIGPROF    : constant := 29; --  profiling timer expired
 113    SIGXCPU    : constant := 30; --  CPU time limit exceeded
 114    SIGXFSZ    : constant := 31; --  filesize limit exceeded
 115    SIGWAITING : constant := 32; --  process's lwps blocked (Solaris)
 116    SIGLWP     : constant := 33; --  used by thread library (Solaris)
 117    SIGFREEZE  : constant := 34; --  used by CPR (Solaris)
 118    SIGTHAW    : constant := 35; --  used by CPR (Solaris)
 119    SIGCANCEL  : constant := 36; --  used for thread cancel (Solaris)
 120    SIGRTMIN   : constant := 38; --  first (highest-priority) realtime signal
 121    SIGRTMAX   : constant := 45; --  last (lowest-priority) realtime signal
 122
 123    type Signal_Set is array (Natural range <>) of Signal;
 124
 125    Unmasked    : constant Signal_Set :=
 126      (SIGTRAP, SIGLWP, SIGTTIN, SIGTTOU, SIGTSTP, SIGPROF);
 127
 128    Reserved    : constant Signal_Set :=
 129      (SIGKILL, SIGSTOP, SIGALRM, SIGVTALRM, SIGWAITING, SIGRTMAX);
 130
 131    type sigset_t is private;
 132
 133    function sigaddset (set : access sigset_t; sig : Signal) return int;
 134    pragma Import (C, sigaddset, "sigaddset");
 135
 136    function sigdelset (set : access sigset_t; sig : Signal) return int;
 137    pragma Import (C, sigdelset, "sigdelset");
 138
 139    function sigfillset (set : access sigset_t) return int;
 140    pragma Import (C, sigfillset, "sigfillset");
 141
 142    function sigismember (set : access sigset_t; sig : Signal) return int;
 143    pragma Import (C, sigismember, "sigismember");
 144
 145    function sigemptyset (set : access sigset_t) return int;
 146    pragma Import (C, sigemptyset, "sigemptyset");
 147
 148    type union_type_3 is new String (1 .. 116);
 149    type siginfo_t is record
 150       si_signo     : int;
 151       si_code      : int;
 152       si_errno     : int;
 153       X_data       : union_type_3;
 154    end record;
 155    pragma Convention (C, siginfo_t);
 156
 157    --  The types mcontext_t and gregset_t are part of the ucontext_t
 158    --  information, which is specific to Solaris2.4 for SPARC
 159    --  The ucontext_t info seems to be used by the handler
 160    --  for SIGSEGV to decide whether it is a Storage_Error (stack overflow) or
 161    --  a Constraint_Error (bad pointer).  The original code that did this
 162    --  is suspect, so it is not clear whether we really need this part of
 163    --  the signal context information, or perhaps something else.
 164    --  More analysis is needed, after which these declarations may need to
 165    --  be changed.
 166
 167    EMT_TAGOVF  : constant := 1; --  tag overflow
 168    FPE_INTDIV  : constant := 1; --  integer divide by zero
 169    FPE_INTOVF  : constant := 2; --  integer overflow
 170    FPE_FLTDIV  : constant := 3; --  floating point divide by zero
 171    FPE_FLTOVF  : constant := 4; --  floating point overflow
 172    FPE_FLTUND  : constant := 5; --  floating point underflow
 173    FPE_FLTRES  : constant := 6; --  floating point inexact result
 174    FPE_FLTINV  : constant := 7; --  invalid floating point operation
 175    FPE_FLTSUB  : constant := 8; --  subscript out of range
 176
 177    SEGV_MAPERR : constant := 1; --  address not mapped to object
 178    SEGV_ACCERR : constant := 2; --  invalid permissions
 179
 180    BUS_ADRALN  : constant := 1; --  invalid address alignment
 181    BUS_ADRERR  : constant := 2; --  non-existent physical address
 182    BUS_OBJERR  : constant := 3; --  object specific hardware error
 183
 184    ILL_ILLOPC  : constant := 1; --  illegal opcode
 185    ILL_ILLOPN  : constant := 2; --  illegal operand
 186    ILL_ILLADR  : constant := 3; --  illegal addressing mode
 187    ILL_ILLTRP  : constant := 4; --  illegal trap
 188    ILL_PRVOPC  : constant := 5; --  privileged opcode
 189    ILL_PRVREG  : constant := 6; --  privileged register
 190    ILL_COPROC  : constant := 7; --  co-processor
 191    ILL_BADSTK  : constant := 8; --  bad stack
 192
 193    type greg_t is new int;
 194
 195    type gregset_t is array (Integer range 0 .. 18) of greg_t;
 196
 197    REG_O0 : constant := 11;
 198    --  index of saved register O0 in ucontext.uc_mcontext.gregs array
 199
 200    type union_type_2 is new String (1 .. 128);
 201    type record_type_1 is record
 202       fpu_fr       : union_type_2;
 203       fpu_q        : System.Address;
 204       fpu_fsr      : unsigned;
 205       fpu_qcnt     : unsigned_char;
 206       fpu_q_entrysize  : unsigned_char;
 207       fpu_en       : unsigned_char;
 208    end record;
 209    pragma Convention (C, record_type_1);
 210    type array_type_7 is array (Integer range 0 .. 20) of long;
 211    type mcontext_t is record
 212       gregs        : gregset_t;
 213       gwins        : System.Address;
 214       fpregs       : record_type_1;
 215       filler       : array_type_7;
 216    end record;
 217    pragma Convention (C, mcontext_t);
 218
 219    type record_type_2 is record
 220       ss_sp        : System.Address;
 221       ss_size      : int;
 222       ss_flags     : int;
 223    end record;
 224    pragma Convention (C, record_type_2);
 225    type array_type_8 is array (Integer range 0 .. 22) of long;
 226    type ucontext_t is record
 227       uc_flags     : unsigned_long;
 228       uc_link      : System.Address;
 229       uc_sigmask   : sigset_t;
 230       uc_stack     : record_type_2;
 231       uc_mcontext  : mcontext_t;
 232       uc_filler    : array_type_8;
 233    end record;
 234    pragma Convention (C, ucontext_t);
 235
 236    type Signal_Handler is access procedure
 237       (signo   : Signal;
 238        info    : access siginfo_t;
 239        context : access ucontext_t);
 240
 241    type union_type_1 is new plain_char;
 242    type array_type_2 is array (Integer range 0 .. 1) of int;
 243    type struct_sigaction is record
 244       sa_flags     : int;
 245       sa_handler   : System.Address;
 246       sa_mask      : sigset_t;
 247       sa_resv      : array_type_2;
 248    end record;
 249    pragma Convention (C, struct_sigaction);
 250    type struct_sigaction_ptr is access all struct_sigaction;
 251
 252    SIG_BLOCK   : constant := 1;
 253    SIG_UNBLOCK : constant := 2;
 254    SIG_SETMASK : constant := 3;
 255
 256    SIG_DFL : constant := 0;
 257    SIG_IGN : constant := 1;
 258
 259    function sigaction
 260      (sig  : Signal;
 261       act  : struct_sigaction_ptr;
 262       oact : struct_sigaction_ptr) return int;
 263    pragma Import (C, sigaction, "sigaction");
 264
 265    ----------
 266    -- Time --
 267    ----------
 268
 269    Time_Slice_Supported : constant Boolean := False;
 270    --  Indicates wether time slicing is supported (i.e FSU threads have been
 271    --  compiled with DEF_RR)
 272
 273    type timespec is private;
 274
 275    type clockid_t is private;
 276
 277    CLOCK_REALTIME : constant clockid_t;
 278
 279    function clock_gettime
 280      (clock_id : clockid_t;
 281       tp       : access timespec) return int;
 282    pragma Import (C, clock_gettime, "clock_gettime");
 283
 284    function To_Duration (TS : timespec) return Duration;
 285    pragma Inline (To_Duration);
 286
 287    function To_Timespec (D : Duration) return timespec;
 288    pragma Inline (To_Timespec);
 289
 290    type struct_timeval is private;
 291
 292    function To_Duration (TV : struct_timeval) return Duration;
 293    pragma Inline (To_Duration);
 294
 295    function To_Timeval (D : Duration) return struct_timeval;
 296    pragma Inline (To_Timeval);
 297
 298    -------------------------
 299    -- Priority Scheduling --
 300    -------------------------
 301
 302    SCHED_FIFO  : constant := 0;
 303    SCHED_RR    : constant := 1;
 304    SCHED_OTHER : constant := 2;
 305
 306    -------------
 307    -- Process --
 308    -------------
 309
 310    type pid_t is private;
 311
 312    function kill (pid : pid_t; sig : Signal) return int;
 313    pragma Import (C, kill, "kill");
 314
 315    function getpid return pid_t;
 316    pragma Import (C, getpid, "getpid");
 317
 318    ---------
 319    -- LWP --
 320    ---------
 321
 322    function lwp_self return System.Address;
 323    --  lwp_self does not exist on this thread library, revert to pthread_self
 324    --  which is the closest approximation (with getpid). This function is
 325    --  needed to share 7staprop.adb across POSIX-like targets.
 326    pragma Import (C, lwp_self, "pthread_self");
 327
 328    -------------
 329    -- Threads --
 330    -------------
 331
 332    type Thread_Body is access
 333      function (arg : System.Address) return System.Address;
 334    type pthread_t           is private;
 335    subtype Thread_Id        is pthread_t;
 336
 337    type pthread_mutex_t     is limited private;
 338    type pthread_cond_t      is limited private;
 339    type pthread_attr_t      is limited private;
 340    type pthread_mutexattr_t is limited private;
 341    type pthread_condattr_t  is limited private;
 342    type pthread_key_t       is private;
 343
 344    PTHREAD_CREATE_DETACHED : constant := 1;
 345
 346    -----------
 347    -- Stack --
 348    -----------
 349
 350    Stack_Base_Available : constant Boolean := False;
 351    --  Indicates wether the stack base is available on this target.
 352    --  This allows us to share s-osinte.adb between all the FSU run time.
 353    --  Note that this value can only be true if pthread_t has a complete
 354    --  definition that corresponds exactly to the C header files.
 355
 356    function Get_Stack_Base (thread : pthread_t) return Address;
 357    pragma Inline (Get_Stack_Base);
 358    --  returns the stack base of the specified thread.
 359    --  Only call this function when Stack_Base_Available is True.
 360
 361    function Get_Page_Size return size_t;
 362    function Get_Page_Size return Address;
 363    pragma Import (C, Get_Page_Size, "getpagesize");
 364    --  returns the size of a page, or 0 if this is not relevant on this
 365    --  target
 366
 367    PROT_NONE  : constant := 0;
 368    PROT_READ  : constant := 1;
 369    PROT_WRITE : constant := 2;
 370    PROT_EXEC  : constant := 4;
 371    PROT_ALL   : constant := PROT_READ + PROT_WRITE + PROT_EXEC;
 372
 373    PROT_ON    : constant := PROT_NONE;
 374    PROT_OFF   : constant := PROT_ALL;
 375
 376    function mprotect (addr : Address; len : size_t; prot : int) return int;
 377    pragma Import (C, mprotect);
 378
 379    ---------------------------------------
 380    -- Nonstandard Thread Initialization --
 381    ---------------------------------------
 382
 383    procedure pthread_init;
 384    --  FSU_THREADS requires pthread_init, which is nonstandard
 385    --  and this should be invoked during the elaboration of s-taprop.adb
 386    pragma Import (C, pthread_init, "pthread_init");
 387
 388    -------------------------
 389    -- POSIX.1c  Section 3 --
 390    -------------------------
 391
 392    function sigwait (set : access sigset_t; sig : access Signal) return int;
 393    --  FSU_THREADS has a nonstandard sigwait
 394
 395    function pthread_kill (thread : pthread_t; sig : Signal) return int;
 396    pragma Import (C, pthread_kill, "pthread_kill");
 397
 398    type sigset_t_ptr is access all sigset_t;
 399
 400    function pthread_sigmask
 401      (how  : int;
 402       set  : sigset_t_ptr;
 403       oset : sigset_t_ptr) return int;
 404    pragma Import (C, pthread_sigmask, "sigprocmask");
 405
 406    --------------------------
 407    -- POSIX.1c  Section 11 --
 408    --------------------------
 409
 410    function pthread_mutexattr_init
 411      (attr : access pthread_mutexattr_t) return int;
 412    pragma Import (C, pthread_mutexattr_init, "pthread_mutexattr_init");
 413
 414    function pthread_mutexattr_destroy
 415      (attr : access pthread_mutexattr_t) return int;
 416    pragma Import (C, pthread_mutexattr_destroy, "pthread_mutexattr_destroy");
 417
 418    function pthread_mutex_init
 419      (mutex : access pthread_mutex_t;
 420       attr  : access pthread_mutexattr_t) return int;
 421    pragma Import (C, pthread_mutex_init, "pthread_mutex_init");
 422
 423    function pthread_mutex_destroy (mutex : access pthread_mutex_t) return int;
 424    pragma Import (C, pthread_mutex_destroy, "pthread_mutex_destroy");
 425
 426    function pthread_mutex_lock (mutex : access pthread_mutex_t) return int;
 427    --  FSU_THREADS has nonstandard pthread_mutex_lock
 428
 429    function pthread_mutex_unlock (mutex : access pthread_mutex_t) return int;
 430    --  FSU_THREADS has nonstandard pthread_mutex_lock
 431
 432    function pthread_condattr_init
 433      (attr : access pthread_condattr_t) return int;
 434    pragma Import (C, pthread_condattr_init, "pthread_condattr_init");
 435
 436    function pthread_condattr_destroy
 437      (attr : access pthread_condattr_t) return int;
 438    pragma Import (C, pthread_condattr_destroy, "pthread_condattr_destroy");
 439
 440    function pthread_cond_init
 441      (cond : access pthread_cond_t;
 442       attr : access pthread_condattr_t) return int;
 443    pragma Import (C, pthread_cond_init, "pthread_cond_init");
 444
 445    function pthread_cond_destroy (cond : access pthread_cond_t) return int;
 446    pragma Import (C, pthread_cond_destroy, "pthread_cond_destroy");
 447
 448    function pthread_cond_signal (cond : access pthread_cond_t) return int;
 449    pragma Import (C, pthread_cond_signal, "pthread_cond_signal");
 450
 451    function pthread_cond_wait
 452      (cond  : access pthread_cond_t;
 453       mutex : access pthread_mutex_t) return int;
 454    --  FSU_THREADS has a nonstandard pthread_cond_wait
 455
 456    function pthread_cond_timedwait
 457      (cond    : access pthread_cond_t;
 458       mutex   : access pthread_mutex_t;
 459       abstime : access timespec) return int;
 460    --  FSU_THREADS has a nonstandard pthread_cond_timedwait
 461
 462    Relative_Timed_Wait : constant Boolean := False;
 463    --  pthread_cond_timedwait requires an absolute delay time
 464
 465    --------------------------
 466    -- POSIX.1c  Section 13 --
 467    --------------------------
 468
 469    PTHREAD_PRIO_NONE    : constant := 0;
 470    PTHREAD_PRIO_PROTECT : constant := 2;
 471    PTHREAD_PRIO_INHERIT : constant := 1;
 472
 473    function pthread_mutexattr_setprotocol
 474      (attr     : access pthread_mutexattr_t;
 475       protocol : int) return int;
 476    pragma Import (C, pthread_mutexattr_setprotocol);
 477
 478    function pthread_mutexattr_setprioceiling
 479      (attr     : access pthread_mutexattr_t;
 480       prioceiling : int) return int;
 481    pragma Import
 482      (C, pthread_mutexattr_setprioceiling,
 483       "pthread_mutexattr_setprio_ceiling");
 484
 485    type struct_sched_param is record
 486       sched_priority : int;  --  scheduling priority
 487    end record;
 488
 489    function pthread_setschedparam
 490      (thread : pthread_t;
 491       policy : int;
 492       param  : access struct_sched_param) return int;
 493    --  FSU_THREADS does not have pthread_setschedparam
 494
 495    function pthread_attr_setscope
 496      (attr            : access pthread_attr_t;
 497       contentionscope : int) return int;
 498    pragma Import (C, pthread_attr_setscope, "pthread_attr_setscope");
 499
 500    function pthread_attr_setinheritsched
 501      (attr            : access pthread_attr_t;
 502       inheritsched : int) return int;
 503    pragma Import (C, pthread_attr_setinheritsched);
 504
 505    function pthread_attr_setschedpolicy
 506      (attr   : access pthread_attr_t;
 507       policy : int) return int;
 508    pragma Import (C, pthread_attr_setschedpolicy, "pthread_attr_setsched");
 509
 510    function sched_yield return int;
 511    --  FSU_THREADS does not have sched_yield;
 512
 513    ---------------------------
 514    -- P1003.1c - Section 16 --
 515    ---------------------------
 516
 517    function pthread_attr_init (attributes : access pthread_attr_t) return int;
 518    pragma Import (C, pthread_attr_init, "pthread_attr_init");
 519
 520    function pthread_attr_destroy
 521      (attributes : access pthread_attr_t) return int;
 522    pragma Import (C, pthread_attr_destroy, "pthread_attr_destroy");
 523
 524    function pthread_attr_setdetachstate
 525      (attr        : access pthread_attr_t;
 526       detachstate : int) return int;
 527    --  FSU_THREADS has a nonstandard pthread_attr_setdetachstate
 528
 529    function pthread_attr_setstacksize
 530      (attr      : access pthread_attr_t;
 531       stacksize : size_t) return int;
 532    pragma Import (C, pthread_attr_setstacksize);
 533
 534    function pthread_create
 535      (thread        : access pthread_t;
 536       attributes    : access pthread_attr_t;
 537       start_routine : Thread_Body;
 538       arg           : System.Address) return int;
 539    pragma Import (C, pthread_create, "pthread_create");
 540
 541    procedure pthread_exit (status : System.Address);
 542    pragma Import (C, pthread_exit, "pthread_exit");
 543
 544    function pthread_self return pthread_t;
 545    pragma Import (C, pthread_self, "pthread_self");
 546
 547    --------------------------
 548    -- POSIX.1c  Section 17 --
 549    --------------------------
 550
 551    function pthread_setspecific
 552      (key   : pthread_key_t;
 553       value : System.Address) return int;
 554    pragma Import (C, pthread_setspecific, "pthread_setspecific");
 555
 556    function pthread_getspecific (key : pthread_key_t) return System.Address;
 557    --  FSU_THREADS has a nonstandard pthread_getspecific
 558
 559    type destructor_pointer is access procedure (arg : System.Address);
 560
 561    function pthread_key_create
 562      (key        : access pthread_key_t;
 563       destructor : destructor_pointer) return int;
 564    pragma Import (C, pthread_key_create, "pthread_key_create");
 565
 566 private
 567
 568    type array_type_1 is array (Integer range 0 .. 3) of unsigned_long;
 569    type sigset_t is record
 570       X_X_sigbits  : array_type_1;
 571    end record;
 572    pragma Convention (C, sigset_t);
 573
 574    type pid_t is new long;
 575
 576    type time_t is new long;
 577
 578    type timespec is record
 579       tv_sec  : time_t;
 580       tv_nsec : long;
 581    end record;
 582    pragma Convention (C, timespec);
 583
 584    type clockid_t is new int;
 585    CLOCK_REALTIME : constant clockid_t := 0;
 586
 587    type struct_timeval is record
 588       tv_sec  : long;
 589       tv_usec : long;
 590    end record;
 591    pragma Convention (C, struct_timeval);
 592
 593    type pthread_attr_t is record
 594       flags           : int;
 595       stacksize       : int;
 596       contentionscope : int;
 597       inheritsched    : int;
 598       detachstate     : int;
 599       sched           : int;
 600       prio            : int;
 601       starttime       : timespec;
 602       deadline        : timespec;
 603       period          : timespec;
 604    end record;
 605    pragma Convention (C, pthread_attr_t);
 606
 607    type pthread_condattr_t is record
 608       flags : int;
 609    end record;
 610    pragma Convention (C, pthread_condattr_t);
 611
 612    type pthread_mutexattr_t is record
 613       flags        : int;
 614       prio_ceiling : int;
 615       protocol     : int;
 616    end record;
 617    pragma Convention (C, pthread_mutexattr_t);
 618
 619    type sigjmp_buf is array (Integer range 0 .. 18) of int;
 620
 621    type pthread_t_struct is record
 622       context    : sigjmp_buf;
 623       pbody      : sigjmp_buf;
 624       errno      : int;
 625       ret        : int;
 626       stack_base : System.Address;
 627    end record;
 628    pragma Convention (C, pthread_t_struct);
 629
 630    type pthread_t is access all pthread_t_struct;
 631
 632    type queue_t is record
 633       head : System.Address;
 634       tail : System.Address;
 635    end record;
 636    pragma Convention (C, queue_t);
 637
 638    type pthread_mutex_t is record
 639       queue                 : queue_t;
 640       lock                  : plain_char;
 641       owner                 : System.Address;
 642       flags                 : int;
 643       prio_ceiling          : int;
 644       protocol              : int;
 645       prev_max_ceiling_prio : int;
 646    end record;
 647    pragma Convention (C, pthread_mutex_t);
 648
 649    type pthread_cond_t is record
 650       queue        : queue_t;
 651       flags        : int;
 652       waiters      : int;
 653       mutex        : System.Address;
 654    end record;
 655    pragma Convention (C, pthread_cond_t);
 656
 657    type pthread_key_t is new int;
 658
 659 end System.OS_Interface;