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