1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
|
{
$Id: libasync.pp,v 1.10 2005/02/14 17:13:19 peter Exp $
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
{$ifdef VER1_0}
uses Linux;
{$else}
uses baseunix, Unix;
{$endif}
const
MaxHandle = SizeOf(TFDSet) * 8 - 1;
type
PIOCallbackData = ^TIOCallbackData;
TIOCallbackData = record
Next: PIOCallbackData;
IOHandle: LongInt;
ReadCallback, WriteCallback: TAsyncCallback;
ReadUserData, WriteUserData: Pointer;
SavedHandleFlags: LongInt;
end;
{$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
{$ifdef VER1_0}fcntl{$else}fpfcntl{$endif}(IOCallback^.IOHandle, F_SetFl, IOCallback^.SavedHandleFlags);
IOCallback := IOCallback^.Next;
end;
if Assigned(Handle^.Data.FDData) then
FreeMem(Handle^.Data.FDData);
end;
procedure InternalRun(Handle: TAsyncHandle; TimeOut: Int64);
var
AsyncResult: Integer;
CurReadFDSet, CurWriteFDSet: TFDSet;
CurIOCallback: PIOCallbackData;
begin
if Handle^.Data.HighestHandle < 0 then
// No I/O checks to do, so just wait...
AsyncResult := {$ifdef VER1_0}Select{$else}fpselect{$endif}(0, nil, nil, nil, TimeOut)
else
begin
CurReadFDSet := PFDSet(Handle^.Data.FDData)[0];
CurWriteFDSet := PFDSet(Handle^.Data.FDData)[1];
AsyncResult := {$ifdef VER1_0}Select{$else}fpselect{$endif}(Handle^.Data.HighestHandle + 1,
@CurReadFDSet, @CurWriteFDSet, nil, TimeOut);
if AsyncResult > 0 then
begin
// Check for I/O events
Handle^.Data.CurIOCallback := Handle^.Data.FirstIOCallback;
while Assigned(Handle^.Data.CurIOCallback) do
begin
CurIOCallback := PIOCallbackData(Handle^.Data.CurIOCallback);
Handle^.Data.NextIOCallback := CurIOCallback^.Next;
{$ifdef VER1_0}
if (FD_IsSet(CurIOCallback^.IOHandle,CurReadFDSet)) and
(FD_IsSet(CurIOCallback^.IOHandle, PFDSet(Handle^.Data.FDData)[0])) and
{$else}
if (fpFD_ISSET(CurIOCallback^.IOHandle,CurReadFDSet) > 0) and
(fpFD_ISSET(CurIOCallback^.IOHandle, PFDSet(Handle^.Data.FDData)[0]) > 0) and
{$endif}
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
{$ifdef VER1_0}
(FD_IsSet(CurIOCallback^.IOHandle, CurWriteFDSet)) and
(FD_IsSet(CurIOCallback^.IOHandle, PFDSet(Handle^.Data.FDData)[1])) and
{$else}
(fpFD_ISSET(CurIOCallback^.IOHandle, CurWriteFDSet) > 0) and
(fpFD_ISSET(CurIOCallback^.IOHandle, PFDSet(Handle^.Data.FDData)[1]) > 0) and
{$endif}
Assigned(CurIOCallback^.WriteCallback) then
begin
CurIOCallback^.WriteCallback(CurIOCallback^.WriteUserData);
if Handle^.Data.DoBreak then
break;
end;
Handle^.Data.CurIOCallback := Handle^.Data.NextIOCallback;
end;
end;
end;
end;
procedure InternalInitIOCallback(Handle: TAsyncHandle; Data: PIOCallbackData;
InitData: Boolean; CallbackTypes: TCallbackTypes);
var
i: LongInt;
begin
if InitData then
begin
if not Assigned(Handle^.Data.FDData) then
begin
GetMem(Handle^.Data.FDData, SizeOf(TFDSet) * 2);
{$ifdef VER1_0}FD_ZERO{$else}fpFD_ZERO{$endif}(PFDSet(Handle^.Data.FDData)[0]);
{$ifdef VER1_0}FD_ZERO{$else}fpFD_ZERO{$endif}(PFDSet(Handle^.Data.FDData)[1]);
end;
if Data^.IOHandle > Handle^.Data.HighestHandle then
Handle^.Data.HighestHandle := Data^.IOHandle;
end;
Data^.SavedHandleFlags := {$ifdef VER1_0}fcntl{$else}fpfcntl{$endif}(Data^.IOHandle, F_GetFl);
{$ifdef VER1_0}fcntl{$else}fpfcntl{$endif}(Data^.IOHandle, F_SetFl, Data^.SavedHandleFlags or Open_NonBlock);
case Data^.IOHandle of
StdInputHandle:
i := Open_RdOnly;
StdOutputHandle, StdErrorHandle:
i := Open_WrOnly;
else
i := Data^.SavedHandleFlags and Open_Accmode;
end;
case i of
Open_RdOnly:
if cbRead in CallbackTypes then
{$ifdef VER1_0}FD_Set{$else}fpFD_SET{$endif}(Data^.IOHandle, PFDSet(Handle^.Data.FDData)[0]);
Open_WrOnly:
if cbWrite in CallbackTypes then
{$ifdef VER1_0}FD_Set{$else}fpFD_SET{$endif}(Data^.IOHandle, PFDSet(Handle^.Data.FDData)[1]);
Open_RdWr:
begin
if cbRead in CallbackTypes then
{$ifdef VER1_0}FD_Set{$else}fpFD_SET{$endif}(Data^.IOHandle, PFDSet(Handle^.Data.FDData)[0]);
if cbWrite in CallbackTypes then
{$ifdef VER1_0}FD_Set{$else}fpFD_SET{$endif}(Data^.IOHandle, PFDSet(Handle^.Data.FDData)[1]);
end;
end;
end;
procedure InternalClearIOCallback(Handle: TAsyncHandle; IOHandle: LongInt;
CallbackTypes: TCallbackTypes);
begin
if not Assigned(Handle) then
exit;
if cbRead in CallbackTypes then
{$ifdef VER1_0}FD_CLR{$else}fpFD_CLR{$endif}(IOHandle, PFDSet(Handle^.Data.FDData)[0]);
if cbWrite in CallbackTypes then
{$ifdef VER1_0}FD_CLR{$else}fpFD_CLR{$endif}(IOHandle, PFDSet(Handle^.Data.FDData)[1]);
end;
function asyncGetTicks: Int64; cdecl;
var
Time: TimeVal;
begin
{$ifdef ver1_0}
GetTimeOfDay(time);
Result := Int64(Time.Sec) * 1000 + Int64(Time.USec div 1000);
{$else}
fpGetTimeOfDay(@time,nil);
Result := Int64(Time.tv_Sec) * 1000 + Int64(Time.tv_USec div 1000);
{$endif}
end;
end.
{
$Log: libasync.pp,v $
Revision 1.10 2005/02/14 17:13:19 peter
* truncate log
}
|
