gcc/ada/5zosinte.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) 1997-2001 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 the VxWorks version of this package.
  36 --
  37 --  VxWorks does not directly support the needed POSIX routines, but it
  38 --  does have other routines that make it possible to code equivalent
  39 --  POSIX compliant routines.  The approach taken is to provide an
  40 --  FSU threads compliant interface.
  41
  42 --  This package encapsulates all direct interfaces to OS services
  43 --  that are needed by children of System.
  44
  45 --  PLEASE DO NOT add any with-clauses to this package
  46 --  or remove the pragma Elaborate_Body.
  47 --  It is designed to be a bottom-level (leaf) package.
  48
  49 with Interfaces.C;
  50 with System.VxWorks;
  51
  52 package System.OS_Interface is
  53    pragma Preelaborate;
  54
  55    subtype int         is Interfaces.C.int;
  56    subtype short       is Short_Integer;
  57    type long           is new Long_Integer;
  58    type unsigned_long  is mod 2 ** long'Size;
  59    type size_t         is mod 2 ** Standard'Address_Size;
  60
  61    -----------
  62    -- Errno --
  63    -----------
  64
  65    function errno return int;
  66    pragma Import (C, errno, "errnoGet");
  67
  68    EINTR     : constant := 4;
  69    EAGAIN    : constant := 35;
  70    ENOMEM    : constant := 12;
  71    EINVAL    : constant := 22;
  72    ETIMEDOUT : constant := 60;
  73
  74    FUNC_ERR  : constant := -1;
  75
  76    ----------------------------
  77    -- Signals and Interrupts --
  78    ----------------------------
  79
  80    NSIG : constant := 32;
  81    --  Number of signals on the target OS
  82    type Signal is new int range 0 .. Interfaces.C."-" (NSIG, 1);
  83
  84    Max_HW_Interrupt : constant := System.VxWorks.Num_HW_Interrupts - 1;
  85    type HW_Interrupt is new int range 0 .. Max_HW_Interrupt;
  86
  87    Max_Interrupt : constant := Max_HW_Interrupt;
  88
  89    SIGILL  : constant :=  4; --  illegal instruction (not reset)
  90    SIGABRT : constant :=  6; --  used by abort, replace SIGIOT in the future
  91    SIGFPE  : constant :=  8; --  floating point exception
  92    SIGBUS  : constant := 10; --  bus error
  93    SIGSEGV : constant := 11; --  segmentation violation
  94
  95    -----------------------------------
  96    -- Signal processing definitions --
  97    -----------------------------------
  98
  99    --  The how in sigprocmask().
 100    SIG_BLOCK   : constant := 1;
 101    SIG_UNBLOCK : constant := 2;
 102    SIG_SETMASK : constant := 3;
 103
 104    --  The sa_flags in struct sigaction.
 105    SA_SIGINFO   : constant := 16#0002#;
 106    SA_ONSTACK   : constant := 16#0004#;
 107
 108    SIG_DFL : constant := 0;
 109    SIG_IGN : constant := 1;
 110
 111    type sigset_t is private;
 112
 113    type struct_sigaction is record
 114       sa_handler : System.Address;
 115       sa_mask    : sigset_t;
 116       sa_flags   : int;
 117    end record;
 118    pragma Convention (C, struct_sigaction);
 119    type struct_sigaction_ptr is access all struct_sigaction;
 120
 121    function sigaddset (set : access sigset_t; sig : Signal) return int;
 122    pragma Import (C, sigaddset, "sigaddset");
 123
 124    function sigdelset (set : access sigset_t; sig : Signal) return int;
 125    pragma Import (C, sigdelset, "sigdelset");
 126
 127    function sigfillset (set : access sigset_t) return int;
 128    pragma Import (C, sigfillset, "sigfillset");
 129
 130    function sigismember (set : access sigset_t; sig : Signal) return int;
 131    pragma Import (C, sigismember, "sigismember");
 132
 133    function sigemptyset (set : access sigset_t) return int;
 134    pragma Import (C, sigemptyset, "sigemptyset");
 135
 136    function sigaction
 137      (sig  : Signal;
 138       act  : struct_sigaction_ptr;
 139       oact : struct_sigaction_ptr) return int;
 140    pragma Import (C, sigaction, "sigaction");
 141
 142    type isr_address is access procedure (sig : int);
 143
 144    function c_signal (sig : Signal; handler : isr_address) return isr_address;
 145    pragma Import (C, c_signal, "signal");
 146
 147    function sigwait (set : access sigset_t; sig : access Signal) return int;
 148    pragma Inline (sigwait);
 149
 150    type sigset_t_ptr is access all sigset_t;
 151
 152    function pthread_sigmask
 153      (how  : int;
 154       set  : sigset_t_ptr;
 155       oset : sigset_t_ptr) return int;
 156    pragma Import (C, pthread_sigmask, "sigprocmask");
 157
 158    type t_id is new long;
 159    subtype Thread_Id is t_id;
 160
 161    function kill (pid : t_id; sig : Signal) return int;
 162    pragma Import (C, kill, "kill");
 163
 164    --  VxWorks doesn't have getpid; taskIdSelf is the equivalent
 165    --  routine.
 166    function getpid return t_id;
 167    pragma Import (C, getpid, "taskIdSelf");
 168
 169    ----------
 170    -- Time --
 171    ----------
 172
 173    type time_t is new unsigned_long;
 174
 175    type timespec is record
 176       ts_sec  : time_t;
 177       ts_nsec : long;
 178    end record;
 179    pragma Convention (C, timespec);
 180
 181    type clockid_t is private;
 182
 183    CLOCK_REALTIME : constant clockid_t;   --  System wide realtime clock
 184
 185    function To_Duration (TS : timespec) return Duration;
 186    pragma Inline (To_Duration);
 187
 188    function To_Timespec (D : Duration) return timespec;
 189    pragma Inline (To_Timespec);
 190
 191    function To_Clock_Ticks (D : Duration) return int;
 192    --  Convert a duration value (in seconds) into clock ticks.
 193
 194    function clock_gettime
 195      (clock_id : clockid_t; tp : access timespec) return int;
 196    pragma Import (C, clock_gettime, "clock_gettime");
 197
 198    type ULONG is new unsigned_long;
 199
 200    procedure tickSet (ticks : ULONG);
 201    pragma Import (C, tickSet, "tickSet");
 202
 203    function tickGet return ULONG;
 204    pragma Import (C, tickGet, "tickGet");
 205
 206    -----------------------------------------------------
 207    --  Convenience routine to convert between VxWorks --
 208    --  priority and Ada priority.                     --
 209    -----------------------------------------------------
 210
 211    function To_VxWorks_Priority (Priority : in int) return int;
 212    pragma Inline (To_VxWorks_Priority);
 213
 214    --------------------------
 215    -- VxWorks specific API --
 216    --------------------------
 217
 218    function taskIdSelf return t_id;
 219    pragma Import (C, taskIdSelf, "taskIdSelf");
 220
 221    function taskSuspend (tid : t_id) return int;
 222    pragma Import (C, taskSuspend, "taskSuspend");
 223
 224    function taskResume (tid : t_id) return int;
 225    pragma Import (C, taskResume, "taskResume");
 226
 227    function taskIsSuspended (tid : t_id) return int;
 228    pragma Import (C, taskIsSuspended, "taskIsSuspended");
 229
 230    function taskVarAdd
 231      (tid : t_id; pVar : System.Address) return int;
 232    pragma Import (C, taskVarAdd, "taskVarAdd");
 233
 234    function taskVarDelete
 235      (tid : t_id; pVar : access System.Address) return int;
 236    pragma Import (C, taskVarDelete, "taskVarDelete");
 237
 238    function taskVarSet
 239      (tid   : t_id;
 240       pVar  : access System.Address;
 241       value : System.Address) return int;
 242    pragma Import (C, taskVarSet, "taskVarSet");
 243
 244    function taskVarGet
 245      (tid  : t_id;
 246       pVar : access System.Address) return int;
 247    pragma Import (C, taskVarGet, "taskVarGet");
 248
 249    function taskDelay (ticks : int) return int;
 250    procedure taskDelay (ticks : int);
 251    pragma Import (C, taskDelay, "taskDelay");
 252
 253    function sysClkRateGet return int;
 254    pragma Import (C, sysClkRateGet, "sysClkRateGet");
 255
 256    --  Option flags for taskSpawn
 257
 258    VX_UNBREAKABLE    : constant := 16#0002#;
 259    VX_FP_TASK        : constant := 16#0008#;
 260    VX_FP_PRIVATE_ENV : constant := 16#0080#;
 261    VX_NO_STACK_FILL  : constant := 16#0100#;
 262
 263    function taskSpawn
 264      (name          : System.Address;  --  Pointer to task name
 265       priority      : int;
 266       options       : int;
 267       stacksize     : size_t;
 268       start_routine : System.Address;
 269       arg1          : System.Address;
 270       arg2          : int := 0;
 271       arg3          : int := 0;
 272       arg4          : int := 0;
 273       arg5          : int := 0;
 274       arg6          : int := 0;
 275       arg7          : int := 0;
 276       arg8          : int := 0;
 277       arg9          : int := 0;
 278       arg10         : int := 0) return t_id;
 279    pragma Import (C, taskSpawn, "taskSpawn");
 280
 281    procedure taskDelete (tid : t_id);
 282    pragma Import (C, taskDelete, "taskDelete");
 283
 284    function kernelTimeSlice (ticks : int) return int;
 285    pragma Import (C, kernelTimeSlice, "kernelTimeSlice");
 286
 287    function taskPrioritySet
 288      (tid : t_id; newPriority : int) return int;
 289    pragma Import (C, taskPrioritySet, "taskPrioritySet");
 290
 291    subtype STATUS is int;
 292    --  Equivalent of the C type STATUS
 293
 294    OK    : constant STATUS := 0;
 295    ERROR : constant STATUS := Interfaces.C.int (-1);
 296
 297    --  Semaphore creation flags.
 298
 299    SEM_Q_FIFO         : constant := 0;
 300    SEM_Q_PRIORITY     : constant := 1;
 301    SEM_DELETE_SAFE    : constant := 4;  -- only valid for binary semaphore
 302    SEM_INVERSION_SAFE : constant := 8;  -- only valid for binary semaphore
 303
 304    --  Semaphore initial state flags
 305
 306    SEM_EMPTY : constant := 0;
 307    SEM_FULL  : constant := 1;
 308
 309    --  Semaphore take (semTake) time constants.
 310
 311    WAIT_FOREVER : constant := -1;
 312    NO_WAIT      : constant := 0;
 313
 314    --  Error codes (errno).  The lower level 16 bits are the
 315    --  error code, with the upper 16 bits representing the
 316    --  module number in which the error occurred.  By convention,
 317    --  the module number is 0 for UNIX errors.  VxWorks reserves
 318    --  module numbers 1-500, with the remaining module numbers
 319    --  being available for user applications.
 320
 321    M_objLib                 : constant := 61 * 2**16;
 322    --  semTake() failure with ticks = NO_WAIT
 323    S_objLib_OBJ_UNAVAILABLE : constant := M_objLib + 2;
 324    --  semTake() timeout with ticks > NO_WAIT
 325    S_objLib_OBJ_TIMEOUT     : constant := M_objLib + 4;
 326
 327    type SEM_ID is new System.Address;
 328    --  typedef struct semaphore *SEM_ID;
 329
 330    --  We use two different kinds of VxWorks semaphores: mutex
 331    --  and binary semaphores.  A null ID is returned when
 332    --  a semaphore cannot be created.
 333
 334    function semBCreate (options : int; initial_state : int) return SEM_ID;
 335    --  Create a binary semaphore. Return ID, or 0 if memory could not
 336    --  be allocated.
 337    pragma Import (C, semBCreate, "semBCreate");
 338
 339    function semMCreate (options : int) return SEM_ID;
 340    pragma Import (C, semMCreate, "semMCreate");
 341
 342    function semDelete (Sem : SEM_ID) return int;
 343    --  Delete a semaphore
 344    pragma Import (C, semDelete, "semDelete");
 345
 346    function semGive (Sem : SEM_ID) return int;
 347    pragma Import (C, semGive, "semGive");
 348
 349    function semTake (Sem : SEM_ID; timeout : int) return int;
 350    --  Attempt to take binary semaphore.  Error is returned if operation
 351    --  times out
 352    pragma Import (C, semTake, "semTake");
 353
 354    function semFlush (SemID : SEM_ID) return STATUS;
 355    --  Release all threads blocked on the semaphore
 356    pragma Import (C, semFlush, "semFlush");
 357
 358    function taskLock return int;
 359    pragma Import (C, taskLock, "taskLock");
 360
 361    function taskUnlock return int;
 362    pragma Import (C, taskUnlock, "taskUnlock");
 363
 364 private
 365    type sigset_t is new long;
 366
 367    type pid_t is new int;
 368
 369    ERROR_PID : constant pid_t := -1;
 370
 371    type clockid_t is new int;
 372    CLOCK_REALTIME : constant clockid_t := 0;
 373
 374 end System.OS_Interface;