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