gcc/ada/s-osinte-lynxos-3.adb

   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 --                                  B o d y                                 --
   8 --                                                                          --
   9 --          Copyright (C) 1999-2007, 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,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, 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 LynxOS (Native) version of this package
  35
  36 pragma Polling (Off);
  37 --  Turn off polling, we do not want ATC polling to take place during
  38 --  tasking operations. It causes infinite loops and other problems.
  39
  40 package body System.OS_Interface is
  41
  42    use Interfaces.C;
  43
  44    -------------------
  45    -- clock_gettime --
  46    -------------------
  47
  48    function clock_gettime
  49      (clock_id : clockid_t;
  50       tp       : access timespec)
  51       return     int
  52    is
  53       function clock_gettime_base
  54         (clock_id : clockid_t;
  55          tp       : access timespec)
  56          return     int;
  57       pragma Import (C, clock_gettime_base, "clock_gettime");
  58
  59    begin
  60       if clock_gettime_base (clock_id, tp) /= 0 then
  61          return errno;
  62       end if;
  63
  64       return 0;
  65    end clock_gettime;
  66
  67    -----------------
  68    -- To_Duration --
  69    -----------------
  70
  71    function To_Duration (TS : timespec) return Duration is
  72    begin
  73       return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
  74    end To_Duration;
  75
  76    ------------------------
  77    -- To_Target_Priority --
  78    ------------------------
  79
  80    function To_Target_Priority
  81      (Prio : System.Any_Priority) return Interfaces.C.int
  82    is
  83    begin
  84       return Interfaces.C.int (Prio);
  85    end To_Target_Priority;
  86
  87    -----------------
  88    -- To_Timespec --
  89    -----------------
  90
  91    function To_Timespec (D : Duration) return timespec is
  92       S : time_t;
  93       F : Duration;
  94
  95    begin
  96       S := time_t (Long_Long_Integer (D));
  97       F := D - Duration (S);
  98
  99       --  If F has negative value due to a round-up, adjust for positive F
 100       --  value.
 101
 102       if F < 0.0 then
 103          S := S - 1;
 104          F := F + 1.0;
 105       end if;
 106
 107       return timespec'(tv_sec => S,
 108         tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
 109    end To_Timespec;
 110
 111    -------------------------
 112    -- POSIX.1c  Section 3 --
 113    -------------------------
 114
 115    function sigwait
 116      (set :  access sigset_t;
 117       sig :  access Signal)
 118       return int
 119    is
 120       function sigwait_base
 121         (set   : access sigset_t;
 122          value : System.Address)
 123          return  Signal;
 124       pragma Import (C, sigwait_base, "sigwait");
 125
 126    begin
 127       sig.all := sigwait_base (set, Null_Address);
 128
 129       if sig.all = -1 then
 130          return errno;
 131       end if;
 132
 133       return 0;
 134    end sigwait;
 135
 136    --------------------------
 137    -- POSIX.1c  Section 11 --
 138    --------------------------
 139
 140    --  For all the following functions, LynxOS threads has the POSIX Draft 4
 141    --  behavior; it sets errno but the standard Posix requires it to be
 142    --  returned.
 143
 144    function pthread_mutexattr_init
 145      (attr : access pthread_mutexattr_t)
 146       return int
 147    is
 148       function pthread_mutexattr_create
 149         (attr : access pthread_mutexattr_t)
 150          return int;
 151       pragma Import (C, pthread_mutexattr_create, "pthread_mutexattr_create");
 152
 153    begin
 154       if pthread_mutexattr_create (attr) /= 0 then
 155          return errno;
 156       end if;
 157
 158       return 0;
 159    end pthread_mutexattr_init;
 160
 161    function pthread_mutexattr_destroy
 162      (attr : access pthread_mutexattr_t)
 163       return int
 164    is
 165       function pthread_mutexattr_delete
 166         (attr : access pthread_mutexattr_t)
 167          return int;
 168       pragma Import (C, pthread_mutexattr_delete, "pthread_mutexattr_delete");
 169
 170    begin
 171       if pthread_mutexattr_delete (attr) /= 0 then
 172          return errno;
 173       end if;
 174
 175       return 0;
 176    end pthread_mutexattr_destroy;
 177
 178    function pthread_mutex_init
 179      (mutex : access pthread_mutex_t;
 180       attr  : access pthread_mutexattr_t)
 181       return  int
 182    is
 183       function pthread_mutex_init_base
 184         (mutex : access pthread_mutex_t;
 185          attr  : pthread_mutexattr_t)
 186          return  int;
 187       pragma Import (C, pthread_mutex_init_base, "pthread_mutex_init");
 188
 189    begin
 190       if pthread_mutex_init_base (mutex, attr.all) /= 0 then
 191          return errno;
 192       end if;
 193
 194       return 0;
 195    end pthread_mutex_init;
 196
 197    function pthread_mutex_destroy
 198      (mutex : access pthread_mutex_t)
 199       return  int
 200    is
 201       function pthread_mutex_destroy_base
 202         (mutex : access pthread_mutex_t)
 203          return  int;
 204       pragma Import (C, pthread_mutex_destroy_base, "pthread_mutex_destroy");
 205
 206    begin
 207       if pthread_mutex_destroy_base (mutex) /= 0 then
 208          return errno;
 209       end if;
 210
 211       return 0;
 212    end pthread_mutex_destroy;
 213
 214    function pthread_mutex_lock
 215      (mutex : access pthread_mutex_t)
 216       return  int
 217    is
 218       function pthread_mutex_lock_base
 219         (mutex : access pthread_mutex_t)
 220          return  int;
 221       pragma Import (C, pthread_mutex_lock_base, "pthread_mutex_lock");
 222
 223    begin
 224       if pthread_mutex_lock_base (mutex) /= 0 then
 225          return errno;
 226       end if;
 227
 228       return 0;
 229    end pthread_mutex_lock;
 230
 231    function pthread_mutex_unlock
 232      (mutex : access pthread_mutex_t)
 233       return  int
 234    is
 235       function pthread_mutex_unlock_base
 236         (mutex : access pthread_mutex_t)
 237          return  int;
 238       pragma Import (C, pthread_mutex_unlock_base, "pthread_mutex_unlock");
 239
 240    begin
 241       if pthread_mutex_unlock_base (mutex) /= 0 then
 242          return errno;
 243       end if;
 244
 245       return 0;
 246    end pthread_mutex_unlock;
 247
 248    function pthread_condattr_init
 249      (attr : access pthread_condattr_t)
 250       return int
 251    is
 252       function pthread_condattr_create
 253         (attr : access pthread_condattr_t)
 254          return int;
 255       pragma Import (C, pthread_condattr_create, "pthread_condattr_create");
 256
 257    begin
 258       if pthread_condattr_create (attr) /= 0 then
 259          return errno;
 260       end if;
 261
 262       return 0;
 263    end pthread_condattr_init;
 264
 265    function pthread_condattr_destroy
 266      (attr : access pthread_condattr_t)
 267       return int
 268    is
 269       function pthread_condattr_delete
 270         (attr : access pthread_condattr_t)
 271          return int;
 272       pragma Import (C, pthread_condattr_delete, "pthread_condattr_delete");
 273
 274    begin
 275       if pthread_condattr_delete (attr) /= 0 then
 276          return errno;
 277       end if;
 278
 279       return 0;
 280    end pthread_condattr_destroy;
 281
 282    function pthread_cond_init
 283      (cond : access pthread_cond_t;
 284       attr : access pthread_condattr_t)
 285       return int
 286    is
 287       function pthread_cond_init_base
 288         (cond : access pthread_cond_t;
 289          attr : pthread_condattr_t)
 290          return int;
 291       pragma Import (C, pthread_cond_init_base, "pthread_cond_init");
 292
 293    begin
 294       if pthread_cond_init_base (cond, attr.all) /= 0 then
 295          return errno;
 296       end if;
 297
 298       return 0;
 299    end pthread_cond_init;
 300
 301    function pthread_cond_destroy
 302      (cond : access pthread_cond_t)
 303       return int
 304    is
 305       function pthread_cond_destroy_base
 306         (cond : access pthread_cond_t)
 307          return int;
 308       pragma Import (C, pthread_cond_destroy_base, "pthread_cond_destroy");
 309
 310    begin
 311       if pthread_cond_destroy_base (cond) /= 0 then
 312          return errno;
 313       end if;
 314
 315       return 0;
 316    end pthread_cond_destroy;
 317
 318    function pthread_cond_signal
 319      (cond : access pthread_cond_t)
 320       return int
 321    is
 322       function pthread_cond_signal_base
 323         (cond : access pthread_cond_t)
 324          return int;
 325       pragma Import (C, pthread_cond_signal_base, "pthread_cond_signal");
 326
 327    begin
 328       if pthread_cond_signal_base (cond) /= 0 then
 329          return errno;
 330       end if;
 331
 332       return 0;
 333    end pthread_cond_signal;
 334
 335    function pthread_cond_wait
 336      (cond  : access pthread_cond_t;
 337       mutex : access pthread_mutex_t)
 338       return  int
 339    is
 340       function pthread_cond_wait_base
 341         (cond  : access pthread_cond_t;
 342          mutex : access pthread_mutex_t)
 343          return  int;
 344       pragma Import (C, pthread_cond_wait_base, "pthread_cond_wait");
 345
 346    begin
 347       if pthread_cond_wait_base (cond, mutex) /= 0 then
 348          return errno;
 349       end if;
 350
 351       return 0;
 352    end pthread_cond_wait;
 353
 354    function pthread_cond_timedwait
 355      (cond    : access pthread_cond_t;
 356       mutex   : access pthread_mutex_t;
 357       reltime : access timespec) return int
 358    is
 359       function pthread_cond_timedwait_base
 360         (cond    : access pthread_cond_t;
 361          mutex   : access pthread_mutex_t;
 362          reltime : access timespec) return int;
 363       pragma Import (C, pthread_cond_timedwait_base, "pthread_cond_timedwait");
 364
 365    begin
 366       if pthread_cond_timedwait_base (cond, mutex, reltime) /= 0 then
 367          if errno = EAGAIN then
 368             return ETIMEDOUT;
 369          end if;
 370
 371          return errno;
 372       end if;
 373
 374       return 0;
 375    end pthread_cond_timedwait;
 376
 377    --------------------------
 378    -- POSIX.1c  Section 13 --
 379    --------------------------
 380
 381    function pthread_setschedparam
 382      (thread : pthread_t;
 383       policy : int;
 384       param  : access struct_sched_param)
 385       return   int
 386    is
 387       function pthread_setscheduler
 388         (thread : pthread_t;
 389          policy : int;
 390          prio   : int)
 391          return   int;
 392       pragma Import (C, pthread_setscheduler, "pthread_setscheduler");
 393
 394    begin
 395       if pthread_setscheduler (thread, policy, param.sched_priority) = -1 then
 396          return errno;
 397       end if;
 398
 399       return 0;
 400    end pthread_setschedparam;
 401
 402    function pthread_mutexattr_setprotocol
 403      (attr     : access pthread_mutexattr_t;
 404       protocol : int)
 405       return     int
 406    is
 407       pragma Unreferenced (attr, protocol);
 408    begin
 409       return 0;
 410    end pthread_mutexattr_setprotocol;
 411
 412    function pthread_mutexattr_setprioceiling
 413      (attr        : access pthread_mutexattr_t;
 414       prioceiling : int)
 415       return        int
 416    is
 417       pragma Unreferenced (attr, prioceiling);
 418    begin
 419       return 0;
 420    end pthread_mutexattr_setprioceiling;
 421
 422    function pthread_attr_setscope
 423      (attr            : access pthread_attr_t;
 424       contentionscope : int)
 425       return            int
 426    is
 427       pragma Unreferenced (attr, contentionscope);
 428    begin
 429       return 0;
 430    end pthread_attr_setscope;
 431
 432    function sched_yield return int is
 433       procedure pthread_yield;
 434       pragma Import (C, pthread_yield, "pthread_yield");
 435
 436    begin
 437       pthread_yield;
 438       return 0;
 439    end sched_yield;
 440
 441    -----------------------------
 442    --  P1003.1c - Section 16  --
 443    -----------------------------
 444
 445    function pthread_attr_setdetachstate
 446      (attr        : access pthread_attr_t;
 447       detachstate : int)
 448       return        int
 449    is
 450       pragma Unreferenced (attr, detachstate);
 451    begin
 452       return 0;
 453    end pthread_attr_setdetachstate;
 454
 455    function pthread_create
 456      (thread        : access pthread_t;
 457       attributes    : access pthread_attr_t;
 458       start_routine : Thread_Body;
 459       arg           : System.Address)
 460       return          int
 461    is
 462       --  The LynxOS pthread_create doesn't seems to work.
 463       --  Workaround : We're using st_new instead.
 464       --
 465       --   function pthread_create_base
 466       --     (thread        : access pthread_t;
 467       --      attributes    : pthread_attr_t;
 468       --      start_routine : Thread_Body;
 469       --      arg           : System.Address)
 470       --      return          int;
 471       --   pragma Import (C, pthread_create_base, "pthread_create");
 472
 473       St : aliased st_t := attributes.st;
 474
 475       function st_new
 476         (start_routine : Thread_Body;
 477          arg           : System.Address;
 478          attributes    : access st_t;
 479          thread        : access pthread_t)
 480          return          int;
 481       pragma Import (C, st_new, "st_new");
 482
 483    begin
 484       --  Following code would be used if above commented function worked
 485
 486       --   if pthread_create_base
 487       --        (thread, attributes.all, start_routine, arg) /= 0 then
 488
 489       if st_new (start_routine, arg, St'Access, thread) /= 0 then
 490          return errno;
 491       end if;
 492
 493       return 0;
 494    end pthread_create;
 495
 496    function pthread_detach (thread : pthread_t) return int is
 497       aliased_thread : aliased pthread_t := thread;
 498
 499       function pthread_detach_base (thread : access pthread_t) return int;
 500       pragma Import (C, pthread_detach_base, "pthread_detach");
 501
 502    begin
 503       if pthread_detach_base (aliased_thread'Access) /= 0 then
 504          return errno;
 505       end if;
 506
 507       return 0;
 508    end pthread_detach;
 509
 510    --------------------------
 511    -- POSIX.1c  Section 17 --
 512    --------------------------
 513
 514    function pthread_setspecific
 515      (key   : pthread_key_t;
 516       value : System.Address)
 517       return  int
 518    is
 519       function pthread_setspecific_base
 520         (key   : pthread_key_t;
 521          value : System.Address)
 522          return  int;
 523       pragma Import (C, pthread_setspecific_base, "pthread_setspecific");
 524
 525    begin
 526       if pthread_setspecific_base (key, value) /= 0 then
 527          return errno;
 528       end if;
 529
 530       return 0;
 531    end pthread_setspecific;
 532
 533    function pthread_getspecific (key : pthread_key_t) return System.Address is
 534       procedure pthread_getspecific_base
 535         (key   : pthread_key_t;
 536          value : access System.Address);
 537       pragma Import (C, pthread_getspecific_base, "pthread_getspecific");
 538
 539       value : aliased System.Address := System.Null_Address;
 540
 541    begin
 542       pthread_getspecific_base (key, value'Unchecked_Access);
 543       return value;
 544    end pthread_getspecific;
 545
 546    function Get_Stack_Base (thread : pthread_t) return Address is
 547       pragma Warnings (Off, thread);
 548
 549    begin
 550       return Null_Address;
 551    end Get_Stack_Base;
 552
 553    function pthread_key_create
 554      (key        : access pthread_key_t;
 555       destructor : destructor_pointer)
 556       return       int
 557    is
 558       function pthread_keycreate
 559         (key        : access pthread_key_t;
 560          destructor : destructor_pointer)
 561          return       int;
 562       pragma Import (C, pthread_keycreate, "pthread_keycreate");
 563
 564    begin
 565       if pthread_keycreate (key, destructor) /= 0 then
 566          return errno;
 567       end if;
 568
 569       return 0;
 570    end pthread_key_create;
 571
 572    procedure pthread_init is
 573    begin
 574       null;
 575    end pthread_init;
 576
 577 end System.OS_Interface;