gcc/ada/i-os2thr.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --             I N T E R F A C E S . O S 2 L I B . T H R E A D S            --
   6 --                                                                          --
   7 --                                  S p e c                                 --
   8 --                                                                          --
   9 --          Copyright (C) 1993-2004 Free Software Foundation, Inc.          --
  10 --                                                                          --
  11 -- GNAT 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.  GNAT 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 GNAT;  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 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 with Interfaces.C;
  35
  36 package Interfaces.OS2Lib.Threads is
  37 pragma Preelaborate (Threads);
  38
  39    package IC renames Interfaces.C;
  40
  41    type PID is new IC.unsigned_long;
  42    type PPID is access all PID;
  43    --  Process ID, and pointer to process ID
  44
  45    type TID is new IC.unsigned_long;
  46    type PTID is access all TID;
  47    --  Thread ID, and pointer to thread ID
  48
  49    -------------------------------------------------------------
  50    -- Thread Creation, Activation, Suspension And Termination --
  51    -------------------------------------------------------------
  52
  53    --  Note: <bsedos.h> defines the "Informations" and "param" parameter below
  54    --  as a ULONG, but everyone knows that in general an address will be passed
  55    --  to it. We declared it here with type PVOID (which it should have had)
  56    --  because Ada is a bit more sensitive to mixing integers and addresses.
  57
  58    type PFNTHREAD is access procedure (Informations : System.Address);
  59    --  TBSL should use PVOID instead of Address as per above node ???
  60
  61    function DosCreateThread
  62      (F_ptid  : PTID;
  63       pfn     : PFNTHREAD;
  64       param   : PVOID;
  65       flag    : ULONG;
  66       cbStack : ULONG) return APIRET;
  67    pragma Import (C, DosCreateThread, "DosCreateThread");
  68
  69    Block_Child     : constant := 1;
  70    No_Block_Child  : constant := 0;
  71    Commit_Stack    : constant := 2;
  72    No_Commit_Stack : constant := 0;
  73    --  Values for "flag" parameter in DosCreateThread call
  74
  75    procedure DosExit (Action : ULONG; Result : ULONG);
  76    pragma Import (C, DosExit, "DosExit");
  77
  78    EXIT_THREAD  : constant := 0;
  79    EXIT_PROCESS : constant := 1;
  80    --  Values for "Action" parameter in Dos_Exit call
  81
  82    function DosResumeThread (Id : TID) return APIRET;
  83    pragma Import (C, DosResumeThread, "DosResumeThread");
  84
  85    function DosSuspendThread (Id : TID) return APIRET;
  86    pragma Import (C, DosSuspendThread, "DosSuspendThread");
  87
  88    procedure DosWaitThread (Thread_Ptr : PTID; Option : ULONG);
  89    pragma Import (C, DosWaitThread, "DosWaitThread");
  90
  91    function DosKillThread (Id : TID) return APIRET;
  92    pragma Import (C, DosKillThread, "DosKillThread");
  93
  94
  95    DCWW_WAIT   : constant := 0;
  96    DCWW_NOWAIT : constant := 1;
  97    --  Values for "Option" parameter in DosWaitThread call
  98
  99    ---------------------------------------------------
 100    -- Accessing properties of Threads and Processes --
 101    ---------------------------------------------------
 102
 103    --  Structures translated from BSETIB.H
 104
 105    --  Thread Information Block (TIB)
 106    --  Need documentation clarifying distinction between TIB, TIB2 ???
 107
 108    --  GB970409: Changed TIB2 structure, because the tib2_ulprio field
 109    --            is not the actual priority but contains two byte fields
 110    --            that hold the priority class and rank respectively.
 111    --            A proper Ada style record with explicit representation
 112    --            avoids this kind of errors.
 113
 114    type TIB2 is record
 115       Thread_ID           : TID;
 116       Prio_Rank           : UCHAR;
 117       Prio_Class          : UCHAR;
 118       Version             : ULONG;  -- Version number for this structure
 119       Must_Complete_Count : USHORT; -- Must Complete count
 120       Must_Complete_Force : USHORT; -- Must Complete force flag
 121    end record;
 122
 123    type PTIB2 is access all TIB2;
 124
 125    --  Thread Information Block (TIB)
 126
 127    type TIB is record
 128       tib_pexchain      : PVOID;  -- Head of exception handler chain
 129       tib_pstack        : PVOID;  -- Pointer to base of stack
 130       tib_pstacklimit   : PVOID;  -- Pointer to end of stack
 131       System            : PTIB2;  -- Pointer to system specific TIB
 132       tib_version       : ULONG;  -- Version number for this TIB structure
 133       tib_ordinal       : ULONG;  -- Thread ordinal number
 134    end record;
 135
 136    type PTIB is access all TIB;
 137
 138    --  Process Information Block (PIB)
 139
 140    type PIB is record
 141       pib_ulpid         : ULONG;   -- Process I.D.
 142       pib_ulppid        : ULONG;   -- Parent process I.D.
 143       pib_hmte          : ULONG;   -- Program (.EXE) module handle
 144       pib_pchcmd        : PCHAR;   -- Command line pointer
 145       pib_pchenv        : PCHAR;   -- Environment pointer
 146       pib_flstatus      : ULONG;   -- Process' status bits
 147       pib_ultype        : ULONG;   -- Process' type code
 148    end record;
 149
 150    type PPIB is access all PIB;
 151
 152    function DosGetInfoBlocks
 153      (Pptib : access PTIB;
 154       Pppib : access PPIB) return APIRET;
 155    pragma Import (C, DosGetInfoBlocks, "DosGetInfoBlocks");
 156
 157    --  Thread local memory
 158
 159    --  This function allocates a block of memory that is unique, or local, to
 160    --  a thread.
 161
 162    function DosAllocThreadLocalMemory
 163      (cb : ULONG;               -- Number of 4-byte DWORDs to allocate
 164       p  : access PVOID)        -- Address of the memory block
 165       return APIRET;                   -- Return Code (rc)
 166    pragma Import
 167      (Convention => C,
 168       Entity     => DosAllocThreadLocalMemory,
 169       Link_Name  => "_DosAllocThreadLocalMemory");
 170
 171    ----------------
 172    -- Priorities --
 173    ----------------
 174
 175    function DosSetPriority
 176      (Scope   : ULONG;
 177       Class   : ULONG;
 178       Delta_P : IC.long;
 179       PorTid  : TID) return APIRET;
 180    pragma Import (C, DosSetPriority, "DosSetPriority");
 181
 182    PRTYS_PROCESS     : constant := 0;
 183    PRTYS_PROCESSTREE : constant := 1;
 184    PRTYS_THREAD      : constant := 2;
 185    --  Values for "Scope" parameter in DosSetPriority call
 186
 187    PRTYC_NOCHANGE         : constant := 0;
 188    PRTYC_IDLETIME         : constant := 1;
 189    PRTYC_REGULAR          : constant := 2;
 190    PRTYC_TIMECRITICAL     : constant := 3;
 191    PRTYC_FOREGROUNDSERVER : constant := 4;
 192    --  Values for "class" parameter in DosSetPriority call
 193
 194 end Interfaces.OS2Lib.Threads;