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{
libasync: Asynchronous event management
Copyright (C) 2001-2002 by
Areca Systems GmbH / Sebastian Guenther, sg@freepascal.org
Unix implementation
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
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.
}
unit libasync;
{$MODE objfpc}
interface
type
TAsyncData = record
IsRunning, DoBreak: Boolean;
HasCallbacks: Boolean; // True as long as callbacks are set
FirstTimer: Pointer;
FirstIOCallback: Pointer;
CurIOCallback: Pointer; // current callback being processed within 'run'
NextIOCallback: Pointer; // next callback to get processed within 'run'
FDData: Pointer;
HighestHandle: LongInt;
end;
{$INCLUDE libasynch.inc}
implementation
uses unixtype, baseunix, Unix;
const
MaxHandle = SizeOf(TFDSet) * 8 - 1;
type
PIOCallbackData = ^TIOCallbackData;
TIOCallbackData = record
Next: PIOCallbackData;
IOHandle: LongInt;
ReadCallback, WriteCallback: TAsyncCallback;
ReadUserData, WriteUserData: Pointer;
SavedHandleFlags: LongInt;
end;
{$INCLUDE libasync.inc}
procedure InternalInit(Handle: TAsyncHandle);
begin
Handle^.Data.HighestHandle := -1;
end;
procedure InternalFree(Handle: TAsyncHandle);
var
IOCallback: PIOCallbackData;
begin
IOCallback := PIOCallbackData(Handle^.Data.FirstIOCallback);
while Assigned(IOCallback) do
begin
if (IOCallback^.SavedHandleFlags and Open_NonBlock) = 0 then
fpfcntl(IOCallback^.IOHandle, F_SetFl, IOCallback^.SavedHandleFlags);
IOCallback := IOCallback^.Next;
end;
if Assigned(Handle^.Data.FDData) then
FreeMem(Handle^.Data.FDData);
end;
procedure InternalRun(Handle: TAsyncHandle; TimeOut: Int64);
var
AsyncResult: Integer;
CurReadFDSet, CurWriteFDSet: TFDSet;
CurIOCallback: PIOCallbackData;
begin
if Handle^.Data.HighestHandle < 0 then
begin
// No I/O checks to do, so just wait...
repeat
AsyncResult := fpselect(0, nil, nil, nil, TimeOut)
until (AsyncResult<>-1) or (fpgeterrno<>ESysEINTR);
end
else
begin
CurReadFDSet := PFDSet(Handle^.Data.FDData)[0];
CurWriteFDSet := PFDSet(Handle^.Data.FDData)[1];
repeat
AsyncResult := fpselect(Handle^.Data.HighestHandle + 1,
@CurReadFDSet, @CurWriteFDSet, nil, TimeOut);
until (AsyncResult<>-1) or (fpgeterrno<>ESysEINTR);
if AsyncResult > 0 then
begin
// Check for I/O events
Handle^.Data.CurIOCallback := Handle^.Data.FirstIOCallback;
while Assigned(Handle^.Data.CurIOCallback) do
begin
CurIOCallback := PIOCallbackData(Handle^.Data.CurIOCallback);
Handle^.Data.NextIOCallback := CurIOCallback^.Next;
if (fpFD_ISSET(CurIOCallback^.IOHandle,CurReadFDSet) > 0) and
(fpFD_ISSET(CurIOCallback^.IOHandle, PFDSet(Handle^.Data.FDData)[0]) > 0) and
Assigned(CurIOCallback^.ReadCallback) then
begin
CurIOCallback^.ReadCallback(CurIOCallback^.ReadUserData);
if Handle^.Data.DoBreak then
break;
end;
CurIOCallback := PIOCallbackData(Handle^.Data.CurIOCallback);
if Assigned(CurIOCallback) and
(fpFD_ISSET(CurIOCallback^.IOHandle, CurWriteFDSet) > 0) and
(fpFD_ISSET(CurIOCallback^.IOHandle, PFDSet(Handle^.Data.FDData)[1]) > 0) and
Assigned(CurIOCallback^.WriteCallback) then
begin
CurIOCallback^.WriteCallback(CurIOCallback^.WriteUserData);
if Handle^.Data.DoBreak then
break;
end;
Handle^.Data.CurIOCallback := Handle^.Data.NextIOCallback;
end;
end;
end;
end;
procedure InternalInitIOCallback(Handle: TAsyncHandle; Data: PIOCallbackData;
InitData: Boolean; CallbackTypes: TCallbackTypes);
var
i: LongInt;
begin
if InitData then
begin
if not Assigned(Handle^.Data.FDData) then
begin
GetMem(Handle^.Data.FDData, SizeOf(TFDSet) * 2);
fpFD_ZERO(PFDSet(Handle^.Data.FDData)[0]);
fpFD_ZERO(PFDSet(Handle^.Data.FDData)[1]);
end;
if Data^.IOHandle > Handle^.Data.HighestHandle then
Handle^.Data.HighestHandle := Data^.IOHandle;
end;
Data^.SavedHandleFlags := fpfcntl(Data^.IOHandle, F_GetFl);
fpfcntl(Data^.IOHandle, F_SetFl, Data^.SavedHandleFlags or Open_NonBlock);
case Data^.IOHandle of
StdInputHandle:
i := Open_RdOnly;
StdOutputHandle, StdErrorHandle:
i := Open_WrOnly;
else
i := Data^.SavedHandleFlags and Open_Accmode;
end;
case i of
Open_RdOnly:
if cbRead in CallbackTypes then
fpFD_SET(Data^.IOHandle, PFDSet(Handle^.Data.FDData)[0]);
Open_WrOnly:
if cbWrite in CallbackTypes then
fpFD_SET(Data^.IOHandle, PFDSet(Handle^.Data.FDData)[1]);
Open_RdWr:
begin
if cbRead in CallbackTypes then
fpFD_SET(Data^.IOHandle, PFDSet(Handle^.Data.FDData)[0]);
if cbWrite in CallbackTypes then
fpFD_SET(Data^.IOHandle, PFDSet(Handle^.Data.FDData)[1]);
end;
end;
end;
procedure InternalClearIOCallback(Handle: TAsyncHandle; IOHandle: LongInt;
CallbackTypes: TCallbackTypes);
begin
if not Assigned(Handle) then
exit;
if cbRead in CallbackTypes then
fpFD_CLR(IOHandle, PFDSet(Handle^.Data.FDData)[0]);
if cbWrite in CallbackTypes then
fpFD_CLR(IOHandle, PFDSet(Handle^.Data.FDData)[1]);
end;
function asyncGetTicks: Int64; cdecl;
var
Time: TimeVal;
begin
fpGetTimeOfDay(@time,nil);
Result := Int64(Time.tv_Sec) * 1000 + Int64(Time.tv_USec div 1000);
end;
end.
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