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i_threads.pas
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i_threads.pas
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//------------------------------------------------------------------------------
//
// FPCDoom - Port of Doom to Free Pascal Compiler
// Copyright (C) 1993-1996 by id Software, Inc.
// Copyright (C) 2004-2007 by Jim Valavanis
// Copyright (C) 2017-2022 by Jim Valavanis
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT 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
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
// 02111-1307, USA.
//
//------------------------------------------------------------------------------
// E-Mail: jimmyvalavanis@yahoo.gr
// Site : https://sourceforge.net/projects/fpcdoom/
//------------------------------------------------------------------------------
{$I FPCDoom.inc}
unit i_threads;
interface
type
threadfunc_t = function(p: pointer): integer; stdcall;
type
TDThread = class;
threadinfo_t = record
thread: TDThread;
end;
Pthreadinfo_t = ^threadinfo_t;
TDThread = class
private
suspended: boolean;
protected
ffunc: threadfunc_t;
fparms: Pointer;
fid: Integer;
info: threadinfo_t;
fstatus: integer;
fterminated: boolean;
frunning: boolean;
public
constructor Create(const func: threadfunc_t = nil);
destructor Destroy; override;
procedure Activate(const parms: pointer); overload;
procedure Activate(const func: threadfunc_t; const parms: pointer); overload;
procedure Wait;
function CheckJobDone: Boolean;
function IsIdle: Boolean;
end;
const
THR_DEAD = 0;
THR_ACTIVE = 1;
THR_IDLE = 2;
//==============================================================================
//
// ThreadInc
//
//==============================================================================
function ThreadInc(var x: Integer): Integer;
//==============================================================================
//
// ThreadDec
//
//==============================================================================
function ThreadDec(var x: Integer): Integer;
//==============================================================================
//
// ThreadSet
//
//==============================================================================
function ThreadSet(var x: Integer; const newvalue: Integer): Integer;
implementation
uses
Windows,
i_system;
//==============================================================================
//
// ThreadWorker
//
//==============================================================================
function ThreadWorker(p: Pointer): integer; stdcall;
var
th: TDThread;
begin
result := 0;
th := Pthreadinfo_t(p).thread;
while true do
begin
while (th.fstatus = THR_IDLE) and not th.fterminated do
begin
I_Sleep(0);
end;
if th.fterminated then
exit;
th.frunning := true;
th.ffunc(th.fparms);
th.frunning := false;
if th.fterminated then
exit;
th.fstatus := THR_IDLE;
end;
end;
//==============================================================================
//
// TDThread.Create
//
//==============================================================================
constructor TDThread.Create(const func: threadfunc_t = nil);
begin
fterminated := false;
ffunc := func;
fparms := nil;
fstatus := THR_IDLE;
frunning := false;
info.thread := Self;
fid := I_CreateProcess(@ThreadWorker, @info, true);
suspended := true;
end;
//==============================================================================
//
// TDThread.Destroy
//
//==============================================================================
destructor TDThread.Destroy;
begin
while frunning do
I_Sleep(0);
fterminated := true;
fstatus := THR_DEAD;
I_WaitForProcess(fid, 1);
Inherited Destroy;
end;
//==============================================================================
// TDThread.Activate
//
// JVAL: Should check for fstatus, but it is not called while active
//
//==============================================================================
procedure TDThread.Activate(const parms: pointer);
begin
if not Assigned(ffunc) then
I_Error('TDThread.Activate(): Null function pointer');
fparms := parms;
fstatus := THR_ACTIVE;
suspended := false;
ResumeThread(fid);
end;
//==============================================================================
//
// TDThread.Activate
//
//==============================================================================
procedure TDThread.Activate(const func: threadfunc_t; const parms: pointer);
begin
ffunc := func;
Activate(parms);
end;
//==============================================================================
//
// TDThread.Wait
//
//==============================================================================
procedure TDThread.Wait;
begin
if suspended then
Exit;
while fstatus = THR_ACTIVE do
begin
I_Sleep(0);
end;
suspended := true;
SuspendThread(fid);
end;
//==============================================================================
//
// TDThread.CheckJobDone
//
//==============================================================================
function TDThread.CheckJobDone: Boolean;
begin
if fstatus = THR_IDLE then
begin
if not suspended then
begin
suspended := true;
SuspendThread(fid);
end;
result := true;
end
else
result := false;
end;
//==============================================================================
//
// TDThread.IsIdle
//
//==============================================================================
function TDThread.IsIdle: Boolean;
begin
result := fstatus = THR_IDLE;
end;
//==============================================================================
//
// ThreadInc
//
//==============================================================================
function ThreadInc(var x: Integer): Integer;
begin
Result := InterlockedIncrement(x);
end;
//==============================================================================
//
// ThreadDec
//
//==============================================================================
function ThreadDec(var x: Integer): Integer;
begin
Result := InterlockedDecrement(x);
end;
//==============================================================================
//
// ThreadSet
//
//==============================================================================
function ThreadSet(var x: Integer; const newvalue: Integer): Integer;
begin
Result := InterlockedExchange(x, newvalue);
end;
end.