1 |
tony |
7 |
const
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2 |
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MonitorHookNames: array[0..5] of String = (
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'FB.SQL.MONITOR.Mutex1_0',
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4 |
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'FB.SQL.MONITOR.SharedMem1_0',
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5 |
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'FB.SQL.MONITOR.WriteEvent1_0',
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6 |
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'FB.SQL.MONITOR.WriteFinishedEvent1_0',
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7 |
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'FB.SQL.MONITOR.ReadEvent1_0',
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8 |
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'FB.SQL.MONITOR.ReadFinishedEvent1_0'
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9 |
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);
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10 |
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cDefaultTimeout = 1000; { 1 seconds }
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type
|
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TGlobalInterface = class;
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{Interprocess Communication Objects. All platform dependent IPC is abstracted
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16 |
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into this set of objects }
|
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18 |
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{ TIpcCommon }
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TIpcCommon = class
|
21 |
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private
|
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function GetSa: PSecurityAttributes;
|
23 |
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protected
|
24 |
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FInitialiser: boolean; static;
|
25 |
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FSa : TSecurityAttributes;
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26 |
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private
|
27 |
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Sd : TSecurityDescriptor;
|
28 |
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public
|
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constructor Create;
|
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property Sa : PSecurityAttributes read GetSa;
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end;
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{ TSharedMemory }
|
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{
|
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The shared memory segment is used for interprocess communication and
|
37 |
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holds both a message buffer and a number of shared variables. Shared
|
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memory is allocated to each shared variable using the Allocate function.
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39 |
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An underlying assumption is that each process using the shared memory
|
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calls "Allocate" in the same order and for the same memory sizes.
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|
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Windows:
|
43 |
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|
44 |
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The Windows implementation uses Windows shared memory. This is identified
|
45 |
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by a global name known to every process. There is no security with
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46 |
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the windows implementation and the shared memory can be read by
|
47 |
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any active process.
|
48 |
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|
49 |
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}
|
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|
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TSharedMemory = class(TIpcCommon)
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private
|
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FBuffer: PChar;
|
54 |
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FLastAllocationSize: integer;
|
55 |
|
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FUnused: integer;
|
56 |
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FBufptr: PChar;
|
57 |
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FSharedBuffer: THandle;
|
58 |
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procedure GetSharedMemory(MemSize: integer);
|
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public
|
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constructor Create(MemSize: integer);
|
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destructor Destroy; override;
|
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function Allocate(Size: integer): PChar;
|
63 |
|
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property LastAllocationSize: integer read FLastAllocationSize;
|
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end;
|
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{TMutex}
|
67 |
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|
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TMutex = class(TIpcCommon)
|
69 |
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private
|
70 |
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FMutex: THandle;
|
71 |
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public
|
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constructor Create(MutexName: string);
|
73 |
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destructor Destroy; override;
|
74 |
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procedure Lock;
|
75 |
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procedure Unlock;
|
76 |
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end;
|
77 |
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|
78 |
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{ TSingleLockGate }
|
79 |
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|
80 |
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{
|
81 |
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A single lock gate is either open or closed. When open, any thread can pass
|
82 |
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through it while, when closed, all threads are blocked as they try to pass
|
83 |
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through the gate. When the gate is opened, all blocked threads are resumed.
|
84 |
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|
85 |
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There is an implementation assumption that only one writer thread at
|
86 |
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a time (i.e. the thread which locks or unlocks the gate) can have access to
|
87 |
|
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it at any one time. I.e. an external Mutex prevents race conditions.
|
88 |
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|
89 |
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Windows:
|
90 |
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|
91 |
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In the Windows implementation, a Windows Event is used to implement
|
92 |
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the "gate". No additional functionality is required as the behaviour
|
93 |
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of a Windows event meets the requirement.
|
94 |
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|
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|
96 |
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Always initialised to the Unlocked state
|
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}
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|
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TSingleLockGate = class(TIpcCommon)
|
100 |
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private
|
101 |
|
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FOwner: TGlobalInterface;
|
102 |
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FEvent: THandle;
|
103 |
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public
|
104 |
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constructor Create(EventName: string; AOwner: TGlobalInterface);
|
105 |
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destructor Destroy; override;
|
106 |
|
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procedure PassthroughGate;
|
107 |
|
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procedure Unlock;
|
108 |
|
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procedure Lock;
|
109 |
|
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end;
|
110 |
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|
111 |
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{ TMultilockGate }
|
112 |
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|
113 |
|
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{ This type of Gate is used where several reader threads must pass
|
114 |
|
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through the gate before it can be opened for a writer thread.
|
115 |
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|
116 |
|
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The reader threads register their interest by each locking the gate.
|
117 |
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The writer thread then waits on the locked gate until all the reader
|
118 |
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threads have separately unlocked the gate.
|
119 |
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|
120 |
|
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There is an underlying assumption of a single writer. A Mutex must
|
121 |
|
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be used to control access to the gate from the writer side if this
|
122 |
|
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assumption is invalid.
|
123 |
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|
124 |
|
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Windows:
|
125 |
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|
126 |
|
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The Windows implementation uses an IPC Event and shared memory to hold
|
127 |
|
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an integer - the reader count.
|
128 |
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|
129 |
|
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The readers lock the gate by resetting the event and incrementing the
|
130 |
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reader count. They unlock the gate by decrementing the reader count
|
131 |
|
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and calling set event when the reader count reaches zero.
|
132 |
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|
133 |
|
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The writer waits on the event for the gate to open. This is a timed wait
|
134 |
|
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to avoid the writer being left in an indefinite wait state should a reader
|
135 |
|
|
terminate abnormally.
|
136 |
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|
137 |
|
|
Always initialised to the Unlocked state
|
138 |
|
|
}
|
139 |
|
|
|
140 |
|
|
TMultilockGate = class(TIpcCommon)
|
141 |
|
|
private
|
142 |
|
|
FOnGateTimeout: TNotifyEvent;
|
143 |
|
|
FOwner: TGlobalInterface;
|
144 |
|
|
FEvent: THandle;
|
145 |
|
|
FLockCount: PInteger;
|
146 |
|
|
function GetLockCount: integer;
|
147 |
|
|
public
|
148 |
|
|
constructor Create(EventName: string; AOwner: TGlobalInterface);
|
149 |
|
|
destructor Destroy; override;
|
150 |
|
|
procedure Lock;
|
151 |
|
|
procedure Unlock;
|
152 |
|
|
procedure PassthroughGate;
|
153 |
|
|
property LockCount: integer read GetLockCount;
|
154 |
|
|
property OnGateTimeout: TNotifyEvent read FOnGateTimeout write FOnGateTimeout;
|
155 |
|
|
end;
|
156 |
|
|
|
157 |
|
|
{ TGlobalInterface }
|
158 |
|
|
|
159 |
|
|
TGlobalInterface = class(TIpcCommon)
|
160 |
|
|
private
|
161 |
|
|
FMaxBufferSize: integer;
|
162 |
|
|
FSharedMemory: TSharedMemory;
|
163 |
|
|
FWriteLock: TMutex;
|
164 |
|
|
FBuffer: PChar;
|
165 |
|
|
FTraceDataType,
|
166 |
|
|
FBufferSize: PInteger;
|
167 |
|
|
FTimeStamp: PDateTime;
|
168 |
|
|
FReadReadyEvent: TMultiLockGate;
|
169 |
|
|
FReadFinishedEvent: TMultiLockGate;
|
170 |
|
|
FDataAvailableEvent: TSingleLockGate;
|
171 |
|
|
FWriterBusyEvent: TSingleLockGate;
|
172 |
|
|
FMonitorCount: PInteger;
|
173 |
|
|
procedure HandleGateTimeout(Sender: TObject);
|
174 |
|
|
function GetMonitorCount: integer;
|
175 |
|
|
public
|
176 |
|
|
constructor Create;
|
177 |
|
|
destructor Destroy; override;
|
178 |
|
|
procedure IncMonitorCount;
|
179 |
|
|
procedure DecMonitorCount;
|
180 |
|
|
procedure SendTrace(TraceObject: TTraceObject);
|
181 |
|
|
procedure ReceiveTrace(TraceObject: TTraceObject);
|
182 |
|
|
property DataAvailableEvent: TSingleLockGate read FDataAvailableEvent;
|
183 |
|
|
property WriterBusyEvent: TSingleLockGate read FWriterBusyEvent;
|
184 |
|
|
property ReadReadyEvent: TMultiLockGate read FReadReadyEvent;
|
185 |
|
|
property ReadFinishedEvent: TMultiLockGate read FReadFinishedEvent;
|
186 |
|
|
property WriteLock: TMutex read FWriteLock;
|
187 |
|
|
property MonitorCount: integer read GetMonitorCount;
|
188 |
|
|
property SharedMemory: TSharedMemory read FSharedMemory;
|
189 |
|
|
property MaxBufferSize: integer read FMaxBufferSize;
|
190 |
|
|
end;
|
191 |
|
|
|
192 |
|
|
{ TSharedMemory }
|
193 |
|
|
|
194 |
|
|
procedure TSharedMemory.GetSharedMemory(MemSize: integer);
|
195 |
|
|
begin
|
196 |
|
|
FSharedBuffer := CreateFileMapping(INVALID_HANDLE_VALUE, sa, PAGE_READWRITE,
|
197 |
|
|
0, MemSize, PChar(MonitorHookNames[1]));
|
198 |
|
|
|
199 |
|
|
if GetLastError = ERROR_ALREADY_EXISTS then
|
200 |
|
|
FSharedBuffer := OpenFileMapping(FILE_MAP_ALL_ACCESS, false, PChar(MonitorHookNames[1]))
|
201 |
|
|
else
|
202 |
|
|
FInitialiser := true;
|
203 |
|
|
if (FSharedBuffer = 0) then
|
204 |
|
|
IBError(ibxeCannotCreateSharedResource, [GetLastError]);
|
205 |
|
|
end;
|
206 |
|
|
|
207 |
|
|
constructor TSharedMemory.Create(MemSize: integer);
|
208 |
|
|
begin
|
209 |
|
|
inherited Create;
|
210 |
|
|
FInitialiser := false;
|
211 |
|
|
GetSharedMemory(MemSize);
|
212 |
|
|
FBuffer := MapViewOfFile(FSharedBuffer, FILE_MAP_ALL_ACCESS, 0, 0, 0);
|
213 |
|
|
|
214 |
|
|
if FBuffer = nil then
|
215 |
|
|
IBError(ibxeCannotCreateSharedResource, [GetLastError]);
|
216 |
|
|
FBufPtr := FBuffer;
|
217 |
|
|
FUnused := MemSize
|
218 |
|
|
end;
|
219 |
|
|
|
220 |
|
|
destructor TSharedMemory.Destroy;
|
221 |
|
|
begin
|
222 |
|
|
UnmapViewOfFile(FBuffer);
|
223 |
|
|
CloseHandle(FSharedBuffer);
|
224 |
|
|
inherited Destroy;
|
225 |
|
|
end;
|
226 |
|
|
|
227 |
|
|
function TSharedMemory.Allocate(Size: integer): PChar;
|
228 |
|
|
begin
|
229 |
|
|
if Size > FUnused then
|
230 |
|
|
IBError(ibxeCannotCreateSharedResource, ['Not enough shared memory']);
|
231 |
|
|
Result := FBufPtr;
|
232 |
|
|
|
233 |
|
|
if Size = 0 then
|
234 |
|
|
begin
|
235 |
|
|
FLastAllocationSize := FUnused;
|
236 |
|
|
FUnused := 0
|
237 |
|
|
end
|
238 |
|
|
else
|
239 |
|
|
begin
|
240 |
|
|
FLastAllocationSize := Size;
|
241 |
|
|
Dec(FUnused,Size);
|
242 |
|
|
end;
|
243 |
|
|
Inc(FBufPtr,Size)
|
244 |
|
|
end;
|
245 |
|
|
|
246 |
|
|
{ TIpcCommon }
|
247 |
|
|
|
248 |
|
|
function TIpcCommon.GetSa: PSecurityAttributes;
|
249 |
|
|
begin
|
250 |
|
|
Result := @FSa
|
251 |
|
|
end;
|
252 |
|
|
|
253 |
|
|
constructor TIpcCommon.Create;
|
254 |
|
|
begin
|
255 |
|
|
{ Setup Security so anyone can connect to the MMF/Mutex/Event. This is
|
256 |
|
|
needed when IBX is used in a Service. }
|
257 |
|
|
|
258 |
|
|
InitializeSecurityDescriptor(@Sd,SECURITY_DESCRIPTOR_REVISION);
|
259 |
|
|
SetSecurityDescriptorDacl(@Sd,true,nil,false);
|
260 |
|
|
FSa.nLength := SizeOf(FSa);
|
261 |
|
|
FSa.lpSecurityDescriptor := @Sd;
|
262 |
|
|
FSa.bInheritHandle := true;
|
263 |
|
|
end;
|
264 |
|
|
|
265 |
|
|
|
266 |
|
|
{ TMutex }
|
267 |
|
|
|
268 |
|
|
constructor TMutex.Create(MutexName: string);
|
269 |
|
|
begin
|
270 |
|
|
inherited Create;
|
271 |
|
|
if FInitialiser then
|
272 |
|
|
FMutex := CreateMutex(sa, False, PChar(MutexName))
|
273 |
|
|
else
|
274 |
|
|
FMutex := OpenMutex(MUTEX_ALL_ACCESS, False, PChar(MutexName));
|
275 |
|
|
|
276 |
|
|
if FMutex = 0 then
|
277 |
|
|
IBError(ibxeCannotCreateSharedResource, [GetLastError])
|
278 |
|
|
end;
|
279 |
|
|
|
280 |
|
|
destructor TMutex.Destroy;
|
281 |
|
|
begin
|
282 |
|
|
CloseHandle(FMutex);
|
283 |
|
|
inherited Destroy;
|
284 |
|
|
end;
|
285 |
|
|
|
286 |
|
|
{ Obtain ownership of the Mutex and prevent other threads from accessing protected resource }
|
287 |
|
|
|
288 |
|
|
procedure TMutex.Lock;
|
289 |
|
|
begin
|
290 |
|
|
WaitForSingleObject(FMutex, INFINITE);
|
291 |
|
|
end;
|
292 |
|
|
|
293 |
|
|
{Give up ownership of the Mutex and allow other threads access }
|
294 |
|
|
|
295 |
|
|
procedure TMutex.Unlock;
|
296 |
|
|
begin
|
297 |
|
|
ReleaseMutex(FMutex);
|
298 |
|
|
end;
|
299 |
|
|
|
300 |
|
|
{ TSingleLockGate }
|
301 |
|
|
constructor TSingleLockGate.Create(EventName: string; AOwner: TGlobalInterface);
|
302 |
|
|
begin
|
303 |
|
|
inherited Create;
|
304 |
|
|
FOwner := AOwner;
|
305 |
|
|
if FInitialiser then
|
306 |
|
|
FEvent := CreateEvent(sa, true, true, PChar(EventName))
|
307 |
|
|
else
|
308 |
|
|
FEvent := OpenEvent(EVENT_ALL_ACCESS, true, PChar(EventName));
|
309 |
|
|
|
310 |
|
|
if FEvent = 0 then
|
311 |
|
|
IBError(ibxeCannotCreateSharedResource, [GetLastError])
|
312 |
|
|
end;
|
313 |
|
|
|
314 |
|
|
destructor TSingleLockGate.Destroy;
|
315 |
|
|
begin
|
316 |
|
|
CloseHandle(FEvent);
|
317 |
|
|
inherited Destroy;
|
318 |
|
|
end;
|
319 |
|
|
|
320 |
|
|
|
321 |
|
|
procedure TSingleLockGate.PassthroughGate;
|
322 |
|
|
begin
|
323 |
|
|
WaitForSingleObject(FEvent,INFINITE)
|
324 |
|
|
end;
|
325 |
|
|
|
326 |
|
|
procedure TSingleLockGate.Unlock;
|
327 |
|
|
begin
|
328 |
|
|
SetEvent(FEvent) //Event State set to "signaled"
|
329 |
|
|
end;
|
330 |
|
|
|
331 |
|
|
procedure TSingleLockGate.Lock;
|
332 |
|
|
begin
|
333 |
|
|
ResetEvent(FEvent) //Event State set to "unsignaled"
|
334 |
|
|
end;
|
335 |
|
|
|
336 |
|
|
{ TMultilockGate }
|
337 |
|
|
|
338 |
|
|
constructor TMultilockGate.Create(EventName: string; AOwner: TGlobalInterface);
|
339 |
|
|
begin
|
340 |
|
|
inherited Create;
|
341 |
|
|
FOwner := AOwner;
|
342 |
|
|
FLockCount := PInteger(FOwner.SharedMemory.Allocate(sizeof(FLockCount)));
|
343 |
|
|
if FInitialiser then
|
344 |
|
|
begin
|
345 |
|
|
FEvent := CreateEvent(sa, true, true, PChar(EventName));
|
346 |
|
|
FLockCount^ := 0;
|
347 |
|
|
end
|
348 |
|
|
else
|
349 |
|
|
FEvent := OpenEvent(EVENT_ALL_ACCESS, true, PChar(EventName));
|
350 |
|
|
|
351 |
|
|
if FEvent = 0 then
|
352 |
|
|
IBError(ibxeCannotCreateSharedResource, [GetLastError])
|
353 |
|
|
end;
|
354 |
|
|
|
355 |
|
|
destructor TMultilockGate.Destroy;
|
356 |
|
|
begin
|
357 |
|
|
CloseHandle(FEvent);
|
358 |
|
|
inherited Destroy;
|
359 |
|
|
end;
|
360 |
|
|
|
361 |
|
|
function TMultilockGate.GetLockCount: integer;
|
362 |
|
|
begin
|
363 |
|
|
Result := FLockCount^
|
364 |
|
|
end;
|
365 |
|
|
|
366 |
|
|
procedure TMultilockGate.Lock;
|
367 |
|
|
begin
|
368 |
|
|
InterlockedIncrement(FLockCount^);
|
369 |
|
|
ResetEvent(FEvent);
|
370 |
|
|
//writeln('Lock '+IntToStr(FLockCount^));
|
371 |
|
|
end;
|
372 |
|
|
|
373 |
|
|
procedure TMultilockGate.Unlock;
|
374 |
|
|
begin
|
375 |
|
|
//writeln('Start UnLock '+IntToStr(FLockCount^));
|
376 |
|
|
InterlockedDecrement(FLockCount^);
|
377 |
|
|
if FLockCount^ <= 0 then
|
378 |
|
|
begin
|
379 |
|
|
SetEvent(FEvent);
|
380 |
|
|
FLockCount^ := 0
|
381 |
|
|
end;
|
382 |
|
|
//writeln('UnLock '+IntToStr(FLockCount^));
|
383 |
|
|
end;
|
384 |
|
|
|
385 |
|
|
procedure TMultilockGate.PassthroughGate;
|
386 |
|
|
begin
|
387 |
|
|
if FLockCount^ = 0 then
|
388 |
|
|
Exit;
|
389 |
|
|
while WaitForSingleObject(FEvent,cDefaultTimeout)= WAIT_TIMEOUT do
|
390 |
|
|
{ If we have timed out then we have lost a reader }
|
391 |
|
|
begin
|
392 |
|
|
if FLockCount^ > 0 then
|
393 |
|
|
begin
|
394 |
|
|
UnLock;
|
395 |
|
|
if assigned(FOnGateTimeout) then
|
396 |
|
|
OnGateTimeout(self)
|
397 |
|
|
end
|
398 |
|
|
end;
|
399 |
|
|
end;
|
400 |
|
|
|
401 |
|
|
|
402 |
|
|
{ TGlobalInterface }
|
403 |
|
|
|
404 |
|
|
function TGlobalInterface.GetMonitorCount: integer;
|
405 |
|
|
begin
|
406 |
|
|
Result := FMonitorCount^
|
407 |
|
|
end;
|
408 |
|
|
|
409 |
|
|
procedure TGlobalInterface.HandleGateTimeout(Sender: TObject);
|
410 |
|
|
begin
|
411 |
|
|
//writeln(ClassName+': Gate TimeOut');
|
412 |
|
|
DecMonitorCount
|
413 |
|
|
end;
|
414 |
|
|
|
415 |
|
|
constructor TGlobalInterface.Create;
|
416 |
|
|
begin
|
417 |
|
|
inherited Create;
|
418 |
|
|
FSharedMemory := TSharedMemory.Create(cMonitorHookSize);
|
419 |
|
|
|
420 |
|
|
FWriteLock := TMutex.Create(PChar(MonitorHookNames[0]));
|
421 |
|
|
FDataAvailableEvent := TSingleLockGate.Create(MonitorHookNames[2],self);
|
422 |
|
|
FWriterBusyEvent := TSingleLockGate.Create(MonitorHookNames[3],self);
|
423 |
|
|
FReadReadyEvent := TMultiLockGate.Create(MonitorHookNames[4],self);
|
424 |
|
|
FReadReadyEvent.OnGateTimeout := HandleGateTimeout;
|
425 |
|
|
FReadFinishedEvent := TMultiLockGate.Create(MonitorHookNames[5],self);
|
426 |
|
|
FReadFinishedEvent.OnGateTimeout := HandleGateTimeout;
|
427 |
|
|
|
428 |
|
|
FMonitorCount := PInteger(FSharedMemory.Allocate(sizeof(FMonitorCount)));
|
429 |
|
|
|
430 |
|
|
if FInitialiser then
|
431 |
|
|
FMonitorCount^ := 0;
|
432 |
|
|
FTraceDataType := PInteger(FSharedMemory.Allocate(sizeof(Integer)));
|
433 |
|
|
FTimeStamp := PDateTime(FSharedMemory.Allocate(sizeof(TDateTime)));
|
434 |
|
|
FBufferSize := PInteger(FSharedMemory.Allocate(sizeof(Integer)));
|
435 |
|
|
FBuffer := FSharedMemory.Allocate(0); //All remaining
|
436 |
|
|
FMaxBufferSize := FSharedMemory.LastAllocationSize;
|
437 |
|
|
|
438 |
|
|
if FInitialiser then
|
439 |
|
|
begin
|
440 |
|
|
FBufferSize^ := 0;
|
441 |
|
|
FDataAvailableEvent.Lock
|
442 |
|
|
end;
|
443 |
|
|
end;
|
444 |
|
|
|
445 |
|
|
destructor TGlobalInterface.Destroy;
|
446 |
|
|
begin
|
447 |
|
|
if assigned(FWriteLock) then FWriteLock.Free;
|
448 |
|
|
if assigned(FDataAvailableEvent) then FDataAvailableEvent.Free;
|
449 |
|
|
if assigned(FWriterBusyEvent) then FWriterBusyEvent.Free;
|
450 |
|
|
if assigned(FReadReadyEvent) then FReadReadyEvent.Free;
|
451 |
|
|
if assigned(FReadFinishedEvent) then FReadFinishedEvent.Free;
|
452 |
|
|
if assigned(FSharedMemory) then FSharedMemory.Free;
|
453 |
|
|
inherited Destroy;
|
454 |
|
|
end;
|
455 |
|
|
|
456 |
|
|
procedure TGlobalInterface.IncMonitorCount;
|
457 |
|
|
begin
|
458 |
|
|
InterlockedIncrement(FMonitorCount^)
|
459 |
|
|
end;
|
460 |
|
|
|
461 |
|
|
procedure TGlobalInterface.DecMonitorCount;
|
462 |
|
|
begin
|
463 |
|
|
InterlockedDecrement(FMonitorCount^)
|
464 |
|
|
end;
|
465 |
|
|
|
466 |
|
|
procedure TGlobalInterface.SendTrace(TraceObject: TTraceObject);
|
467 |
|
|
begin
|
468 |
|
|
FTraceDataType^ := Integer(TraceObject.FDataType);
|
469 |
|
|
FTimeStamp^ := TraceObject.FTimeStamp;
|
470 |
|
|
FBufferSize^ := Min(Length(TraceObject.FMsg), MaxBufferSize);
|
471 |
|
|
Move(TraceObject.FMsg[1], FBuffer^, FBufferSize^);
|
472 |
|
|
end;
|
473 |
|
|
|
474 |
|
|
procedure TGlobalInterface.ReceiveTrace(TraceObject: TTraceObject);
|
475 |
|
|
begin
|
476 |
|
|
SetString(TraceObject.FMsg, FBuffer, FBufferSize^);
|
477 |
|
|
TraceObject.FDataType := TTraceFlag(FTraceDataType^);
|
478 |
|
|
TraceObject.FTimeStamp := TDateTime(FTimeStamp^);
|
479 |
|
|
end;
|
480 |
|
|
|
481 |
|
|
|
482 |
|
|
|