gcc/ada/s-osinte-lynxos.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) 1995-2011, 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 (POSIX Threads) version of this package
  34
  35 --  This package encapsulates all direct interfaces to OS services
  36 --  that are 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 package System.OS_Interface is
  46    pragma Preelaborate;
  47
  48    pragma Linker_Options ("-mthreads");
  49    --  Selects the POSIX 1.c runtime, rather than the non-threading runtime
  50    --  or the deprecated legacy threads library. The -mthreads flag is
  51    --  defined in patch.LynxOS and matches the definition for Lynx's gcc.
  52
  53    subtype int            is Interfaces.C.int;
  54    subtype short          is Interfaces.C.short;
  55    subtype long           is Interfaces.C.long;
  56    subtype unsigned       is Interfaces.C.unsigned;
  57    subtype unsigned_short is Interfaces.C.unsigned_short;
  58    subtype unsigned_long  is Interfaces.C.unsigned_long;
  59    subtype unsigned_char  is Interfaces.C.unsigned_char;
  60    subtype plain_char     is Interfaces.C.plain_char;
  61    subtype size_t         is Interfaces.C.size_t;
  62
  63    -----------
  64    -- Errno --
  65    -----------
  66
  67    function errno return int;
  68    pragma Import (C, errno, "__get_errno");
  69
  70    EAGAIN    : constant := 11;
  71    EINTR     : constant := 4;
  72    EINVAL    : constant := 22;
  73    ENOMEM    : constant := 12;
  74    ETIMEDOUT : constant := 60;
  75
  76    -------------
  77    -- Signals --
  78    -------------
  79
  80    Max_Interrupt : constant := 63;
  81
  82    --  Max_Interrupt is the number of OS signals, as defined in:
  83    --
  84    --   /usr/include/sys/signal.h
  85    --
  86    --
  87    --  The lowest numbered signal is 1, but 0 is a valid argument to some
  88    --  library functions, e.g. kill(2). However, 0 is not just another
  89    --  signal: For instance 'I in Signal' and similar should be used with
  90    --  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.
 138    --  SIGTERM 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    -------------------------
 226    -- Priority Scheduling --
 227    -------------------------
 228
 229    SCHED_FIFO  : constant := 16#200000#;
 230    SCHED_RR    : constant := 16#100000#;
 231    SCHED_OTHER : constant := 16#400000#;
 232
 233    -------------
 234    -- Process --
 235    -------------
 236
 237    type pid_t is private;
 238
 239    function kill (pid : pid_t; sig : Signal) return int;
 240    pragma Import (C, kill, "kill");
 241
 242    function getpid return pid_t;
 243    pragma Import (C, getpid, "getpid");
 244
 245    ---------
 246    -- LWP --
 247    ---------
 248
 249    function lwp_self return System.Address;
 250    pragma Import (C, lwp_self, "pthread_self");
 251
 252    -------------
 253    -- Threads --
 254    -------------
 255
 256    type Thread_Body is access
 257      function (arg : System.Address) return System.Address;
 258    pragma Convention (C, Thread_Body);
 259
 260    function Thread_Body_Access is new
 261      Ada.Unchecked_Conversion (System.Address, Thread_Body);
 262
 263    type pthread_t           is private;
 264    subtype Thread_Id        is pthread_t;
 265
 266    type pthread_mutex_t     is limited private;
 267    type pthread_cond_t      is limited private;
 268    type pthread_attr_t      is limited private;
 269    type pthread_mutexattr_t is limited private;
 270    type pthread_condattr_t  is limited private;
 271    type pthread_key_t       is private;
 272
 273    PTHREAD_CREATE_DETACHED : constant := 1;
 274    PTHREAD_CREATE_JOINABLE : constant := 0;
 275
 276    -----------
 277    -- Stack --
 278    -----------
 279
 280    Alternate_Stack_Size : constant := 0;
 281    --  No alternate signal stack is used on this platform
 282
 283    Stack_Base_Available : constant Boolean := False;
 284    --  Indicates whether the stack base is available on this target
 285
 286    function Get_Stack_Base (thread : pthread_t) return Address;
 287    pragma Inline (Get_Stack_Base);
 288    --  Returns the stack base of the specified thread.
 289    --  Only call this function when Stack_Base_Available is True.
 290
 291    function Get_Page_Size return size_t;
 292    function Get_Page_Size return Address;
 293    pragma Import (C, Get_Page_Size, "getpagesize");
 294    --  Returns the size of a page, or 0 if this is not relevant on this
 295    --  target
 296
 297    PROT_NONE  : constant := 1;
 298    PROT_READ  : constant := 2;
 299    PROT_WRITE : constant := 4;
 300    PROT_EXEC  : constant := 8;
 301    PROT_ALL   : constant := PROT_READ + PROT_WRITE + PROT_EXEC;
 302
 303    PROT_ON    : constant := PROT_READ;
 304    PROT_OFF   : constant := PROT_ALL;
 305
 306    function mprotect (addr : Address; len : size_t; prot : int) return int;
 307    pragma Import (C, mprotect);
 308
 309    ---------------------------------------
 310    -- Nonstandard Thread Initialization --
 311    ---------------------------------------
 312
 313    procedure pthread_init;
 314    --  This is a dummy procedure to share some GNULLI files
 315
 316    -------------------------
 317    -- POSIX.1c  Section 3 --
 318    -------------------------
 319
 320    function sigwait
 321      (set : access sigset_t;
 322       sig : access Signal) return int;
 323    pragma Inline (sigwait);
 324    --  LynxOS has non standard sigwait
 325
 326    function pthread_kill
 327      (thread : pthread_t;
 328       sig    : Signal) return int;
 329    pragma Import (C, pthread_kill, "pthread_kill");
 330
 331    function pthread_sigmask
 332      (how  : int;
 333       set  : access sigset_t;
 334       oset : access sigset_t) return int;
 335    pragma Import (C, pthread_sigmask, "pthread_sigmask");
 336    --  The behavior of pthread_sigmask on LynxOS requires
 337    --  further investigation.
 338
 339    ----------------------------
 340    --  POSIX.1c  Section 11  --
 341    ----------------------------
 342
 343    function pthread_mutexattr_init
 344      (attr : access pthread_mutexattr_t) return int;
 345    pragma Import (C, pthread_mutexattr_init, "pthread_mutexattr_init");
 346
 347    function pthread_mutexattr_destroy
 348      (attr : access pthread_mutexattr_t) return int;
 349    pragma Import (C, pthread_mutexattr_destroy, "pthread_mutexattr_destroy");
 350
 351    function pthread_mutex_init
 352      (mutex : access pthread_mutex_t;
 353       attr  : access pthread_mutexattr_t) return int;
 354    pragma Import (C, pthread_mutex_init, "pthread_mutex_init");
 355
 356    function pthread_mutex_destroy (mutex : access pthread_mutex_t) return int;
 357    pragma Import (C, pthread_mutex_destroy, "pthread_mutex_destroy");
 358
 359    function pthread_mutex_lock (mutex : access pthread_mutex_t) return int;
 360    pragma Import (C, pthread_mutex_lock, "pthread_mutex_lock");
 361
 362    function pthread_mutex_unlock (mutex : access pthread_mutex_t) return int;
 363    pragma Import (C, pthread_mutex_unlock, "pthread_mutex_unlock");
 364
 365    function pthread_condattr_init
 366      (attr : access pthread_condattr_t) return int;
 367    pragma Import (C, pthread_condattr_init, "pthread_condattr_init");
 368
 369    function pthread_condattr_destroy
 370      (attr : access pthread_condattr_t) return int;
 371    pragma Import (C, pthread_condattr_destroy, "pthread_condattr_destroy");
 372
 373    function pthread_cond_init
 374      (cond : access pthread_cond_t;
 375       attr : access pthread_condattr_t) return int;
 376    pragma Import (C, pthread_cond_init, "pthread_cond_init");
 377
 378    function pthread_cond_destroy (cond : access pthread_cond_t) return int;
 379    pragma Import (C, pthread_cond_destroy, "pthread_cond_destroy");
 380
 381    function pthread_cond_signal (cond : access pthread_cond_t) return int;
 382    pragma Import (C, pthread_cond_signal, "pthread_cond_signal");
 383
 384    function pthread_cond_wait
 385      (cond  : access pthread_cond_t;
 386       mutex : access pthread_mutex_t) return int;
 387    pragma Import (C, pthread_cond_wait, "pthread_cond_wait");
 388
 389    function pthread_cond_timedwait
 390      (cond    : access pthread_cond_t;
 391       mutex   : access pthread_mutex_t;
 392       abstime : access timespec) return int;
 393    pragma Import (C, pthread_cond_timedwait, "pthread_cond_timedwait");
 394
 395    Relative_Timed_Wait : constant Boolean := False;
 396    --  pthread_cond_timedwait requires an absolute delay time
 397
 398    --------------------------
 399    -- POSIX.1c  Section 13 --
 400    --------------------------
 401
 402    PTHREAD_PRIO_NONE    : constant := 0;
 403    PTHREAD_PRIO_INHERIT : constant := 1;
 404    PTHREAD_PRIO_PROTECT : constant := 2;
 405
 406    function pthread_mutexattr_setprotocol
 407      (attr     : access pthread_mutexattr_t;
 408       protocol : int) return int;
 409    pragma Import (C, pthread_mutexattr_setprotocol);
 410
 411    function pthread_mutexattr_setprioceiling
 412      (attr        : access pthread_mutexattr_t;
 413       prioceiling : int) return int;
 414    pragma Import (C, pthread_mutexattr_setprioceiling);
 415
 416    type struct_sched_param is record
 417       sched_priority : int;
 418    end record;
 419
 420    function pthread_setschedparam
 421      (thread : pthread_t;
 422       policy : int;
 423       param  : access struct_sched_param) return int;
 424    pragma Import (C, pthread_setschedparam, "pthread_setschedparam");
 425
 426    function pthread_attr_setscope
 427      (attr            : access pthread_attr_t;
 428       contentionscope : int) return int;
 429    pragma Import (C, pthread_attr_setscope, "pthread_attr_setscope");
 430
 431    function pthread_attr_setinheritsched
 432      (attr         : access pthread_attr_t;
 433       inheritsched : int) return int;
 434    pragma Import (C, pthread_attr_setinheritsched);
 435
 436    function pthread_attr_setschedpolicy
 437      (attr   : access pthread_attr_t;
 438       policy : int) return int;
 439    pragma Import (C, pthread_attr_setschedpolicy);
 440
 441    function sched_yield return int;
 442    pragma Import (C, sched_yield, "sched_yield");
 443
 444    --------------------------
 445    -- P1003.1c  Section 16 --
 446    --------------------------
 447
 448    function pthread_attr_init (attributes : access pthread_attr_t) return int;
 449    pragma Import (C, pthread_attr_init, "pthread_attr_init");
 450
 451    function pthread_attr_destroy
 452      (attributes : access pthread_attr_t) return int;
 453    pragma Import (C, pthread_attr_destroy, "pthread_attr_destroy");
 454
 455    function pthread_attr_setdetachstate
 456      (attr        : access pthread_attr_t;
 457       detachstate : int) return int;
 458    pragma Import (C, pthread_attr_setdetachstate);
 459
 460    function pthread_attr_setstacksize
 461      (attr      : access pthread_attr_t;
 462       stacksize : size_t) return int;
 463    pragma Import (C, pthread_attr_setstacksize);
 464
 465    function pthread_create
 466      (thread        : access pthread_t;
 467       attributes    : access pthread_attr_t;
 468       start_routine : Thread_Body;
 469       arg           : System.Address) return int;
 470    pragma Import (C, pthread_create, "pthread_create");
 471
 472    procedure pthread_exit (status : System.Address);
 473    pragma Import (C, pthread_exit, "pthread_exit");
 474
 475    function pthread_self return pthread_t;
 476    pragma Import (C, pthread_self, "pthread_self");
 477
 478    --------------------------
 479    -- POSIX.1c  Section 17 --
 480    --------------------------
 481
 482    function st_setspecific
 483      (key   : pthread_key_t;
 484       value : System.Address) return int;
 485    pragma Import (C, st_setspecific, "st_setspecific");
 486
 487    function st_getspecific
 488      (key    : pthread_key_t;
 489       retval : System.Address) return int;
 490    pragma Import (C, st_getspecific, "st_getspecific");
 491
 492    type destructor_pointer is access procedure (arg : System.Address);
 493    pragma Convention (C, destructor_pointer);
 494
 495    function st_keycreate
 496      (destructor : destructor_pointer;
 497       key        : access pthread_key_t) return int;
 498    pragma Import (C, st_keycreate, "st_keycreate");
 499
 500 private
 501
 502    type sigset_t is record
 503       X1, X2 : long;
 504    end record;
 505    pragma Convention (C, sigset_t);
 506
 507    type pid_t is new long;
 508
 509    type time_t is new long;
 510
 511    type timespec is record
 512       tv_sec  : time_t;
 513       tv_nsec : long;
 514    end record;
 515    pragma Convention (C, timespec);
 516
 517    type st_attr_t is record
 518       stksize      : int;
 519       prio         : int;
 520       inheritsched : int;
 521       state        : int;
 522       sched        : int;
 523       detachstate  : int;
 524       guardsize    : int;
 525    end record;
 526    pragma Convention (C, st_attr_t);
 527
 528    type pthread_attr_t is record
 529       pthread_attr_magic : unsigned;
 530       st                 : st_attr_t;
 531       pthread_attr_scope : int;
 532    end record;
 533    pragma Convention (C, pthread_attr_t);
 534
 535    type pthread_condattr_t is record
 536       cv_magic   : unsigned;
 537       cv_pshared : unsigned;
 538    end record;
 539    pragma Convention (C, pthread_condattr_t);
 540
 541    type pthread_mutexattr_t is record
 542       m_flags   : unsigned;
 543       m_prio_c  : int;
 544       m_pshared : int;
 545    end record;
 546    pragma Convention (C, pthread_mutexattr_t);
 547
 548    type tid_t is new short;
 549    type pthread_t is new tid_t;
 550
 551    type block_obj_t is new System.Address;
 552    --  typedef struct _block_obj_s {
 553    --     struct st_entry *b_head;
 554    --  } block_obj_t;
 555
 556    type pthread_mutex_t is record
 557       m_flags      : unsigned;
 558       m_owner      : tid_t;
 559       m_wait       : block_obj_t;
 560       m_prio_c     : int;
 561       m_oldprio    : int;
 562       m_count      : int;
 563       m_referenced : int;
 564    end record;
 565    pragma Convention (C, pthread_mutex_t);
 566    type pthread_mutex_t_ptr is access all pthread_mutex_t;
 567
 568    type pthread_cond_t is record
 569       cv_magic  : unsigned;
 570       cv_wait   : block_obj_t;
 571       cv_mutex  : pthread_mutex_t_ptr;
 572       cv_refcnt : int;
 573    end record;
 574    pragma Convention (C, pthread_cond_t);
 575
 576    type pthread_key_t is new int;
 577
 578 end System.OS_Interface;