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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- I N T E R F A C E S . O S 2 L I B . T H R E A D S --
-- --
-- S p e c --
-- --
-- --
-- Copyright (C) 1993-1997 Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 2, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING. If not, write --
-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
with Interfaces.C;
package Interfaces.OS2Lib.Threads is
pragma Preelaborate (Threads);
package IC renames Interfaces.C;
type PID is new IC.unsigned_long;
type PPID is access all PID;
-- Process ID, and pointer to process ID
type TID is new IC.unsigned_long;
type PTID is access all TID;
-- Thread ID, and pointer to thread ID
-------------------------------------------------------------
-- Thread Creation, Activation, Suspension And Termination --
-------------------------------------------------------------
-- Note: <bsedos.h> defines the "Informations" and "param" parameter below
-- as a ULONG, but everyone knows that in general an address will be passed
-- to it. We declared it here with type PVOID (which it should have had)
-- because Ada is a bit more sensitive to mixing integers and addresses.
type PFNTHREAD is access procedure (Informations : System.Address);
-- TBSL should use PVOID instead of Address as per above node ???
function DosCreateThread
(F_ptid : PTID;
pfn : PFNTHREAD;
param : PVOID;
flag : ULONG;
cbStack : ULONG)
return APIRET;
pragma Import (C, DosCreateThread, "DosCreateThread");
Block_Child : constant := 1;
No_Block_Child : constant := 0;
Commit_Stack : constant := 2;
No_Commit_Stack : constant := 0;
-- Values for "flag" parameter in DosCreateThread call
procedure DosExit (Action : ULONG; Result : ULONG);
pragma Import (C, DosExit, "DosExit");
EXIT_THREAD : constant := 0;
EXIT_PROCESS : constant := 1;
-- Values for "Action" parameter in Dos_Exit call
function DosResumeThread (Id : TID) return APIRET;
pragma Import (C, DosResumeThread, "DosResumeThread");
function DosSuspendThread (Id : TID) return APIRET;
pragma Import (C, DosSuspendThread, "DosSuspendThread");
procedure DosWaitThread (Thread_Ptr : PTID; Option : ULONG);
pragma Import (C, DosWaitThread, "DosWaitThread");
function DosKillThread (Id : TID) return APIRET;
pragma Import (C, DosKillThread, "DosKillThread");
DCWW_WAIT : constant := 0;
DCWW_NOWAIT : constant := 1;
-- Values for "Option" parameter in DosWaitThread call
---------------------------------------------------
-- Accessing properties of Threads and Processes --
---------------------------------------------------
-- Structures translated from BSETIB.H
-- Thread Information Block (TIB)
-- Need documentation clarifying distinction between TIB, TIB2 ???
-- GB970409: Changed TIB2 structure, because the tib2_ulprio field
-- is not the actual priority but contains two byte fields
-- that hold the priority class and rank respectively.
-- A proper Ada style record with explicit representation
-- avoids this kind of errors.
type TIB2 is record
Thread_ID : TID;
Prio_Rank : UCHAR;
Prio_Class : UCHAR;
Version : ULONG; -- Version number for this structure
Must_Complete_Count : USHORT; -- Must Complete count
Must_Complete_Force : USHORT; -- Must Complete force flag
end record;
type PTIB2 is access all TIB2;
-- Thread Information Block (TIB)
type TIB is record
tib_pexchain : PVOID; -- Head of exception handler chain
tib_pstack : PVOID; -- Pointer to base of stack
tib_pstacklimit : PVOID; -- Pointer to end of stack
System : PTIB2; -- Pointer to system specific TIB
tib_version : ULONG; -- Version number for this TIB structure
tib_ordinal : ULONG; -- Thread ordinal number
end record;
type PTIB is access all TIB;
-- Process Information Block (PIB)
type PIB is record
pib_ulpid : ULONG; -- Process I.D.
pib_ulppid : ULONG; -- Parent process I.D.
pib_hmte : ULONG; -- Program (.EXE) module handle
pib_pchcmd : PCHAR; -- Command line pointer
pib_pchenv : PCHAR; -- Environment pointer
pib_flstatus : ULONG; -- Process' status bits
pib_ultype : ULONG; -- Process' type code
end record;
type PPIB is access all PIB;
function DosGetInfoBlocks
(Pptib : access PTIB;
Pppib : access PPIB)
return APIRET;
pragma Import (C, DosGetInfoBlocks, "DosGetInfoBlocks");
-- Thread local memory
-- This function allocates a block of memory that is unique, or local, to
-- a thread.
function DosAllocThreadLocalMemory
(cb : ULONG; -- Number of 4-byte DWORDs to allocate
p : access PVOID) -- Address of the memory block
return
APIRET; -- Return Code (rc)
pragma Import
(Convention => C,
Entity => DosAllocThreadLocalMemory,
Link_Name => "_DosAllocThreadLocalMemory");
-----------------
-- Priorities --
-----------------
function DosSetPriority
(Scope : ULONG;
Class : ULONG;
Delta_P : IC.long;
PorTid : TID)
return APIRET;
pragma Import (C, DosSetPriority, "DosSetPriority");
PRTYS_PROCESS : constant := 0;
PRTYS_PROCESSTREE : constant := 1;
PRTYS_THREAD : constant := 2;
-- Values for "Scope" parameter in DosSetPriority call
PRTYC_NOCHANGE : constant := 0;
PRTYC_IDLETIME : constant := 1;
PRTYC_REGULAR : constant := 2;
PRTYC_TIMECRITICAL : constant := 3;
PRTYC_FOREGROUNDSERVER : constant := 4;
-- Values for "class" parameter in DosSetPriority call
end Interfaces.OS2Lib.Threads;
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