| 1 |
< |
const |
| 2 |
< |
MonitorHookNames: array[0..5] of String = ( |
| 3 |
< |
'FB.SQL.MONITOR.Mutex1_0', |
| 4 |
< |
'FB.SQL.MONITOR.SharedMem1_0', |
| 5 |
< |
'FB.SQL.MONITOR.WriteEvent1_0', |
| 6 |
< |
'FB.SQL.MONITOR.WriteFinishedEvent1_0', |
| 7 |
< |
'FB.SQL.MONITOR.ReadEvent1_0', |
| 8 |
< |
'FB.SQL.MONITOR.ReadFinishedEvent1_0' |
| 9 |
< |
); |
| 10 |
< |
cDefaultTimeout = 1000; { 1 seconds } |
| 11 |
< |
|
| 12 |
< |
type |
| 13 |
< |
TGlobalInterface = class; |
| 14 |
< |
|
| 15 |
< |
{Interprocess Communication Objects. All platform dependent IPC is abstracted |
| 16 |
< |
into this set of objects } |
| 17 |
< |
|
| 18 |
< |
{ TIpcCommon } |
| 19 |
< |
|
| 20 |
< |
TIpcCommon = class |
| 21 |
< |
private |
| 22 |
< |
function GetSa: PSecurityAttributes; |
| 23 |
< |
protected |
| 24 |
< |
FInitialiser: boolean; static; |
| 25 |
< |
FSa : TSecurityAttributes; |
| 26 |
< |
private |
| 27 |
< |
Sd : TSecurityDescriptor; |
| 28 |
< |
public |
| 29 |
< |
constructor Create; |
| 30 |
< |
property Sa : PSecurityAttributes read GetSa; |
| 31 |
< |
end; |
| 32 |
< |
|
| 33 |
< |
{ TSharedMemory } |
| 34 |
< |
|
| 35 |
< |
{ |
| 36 |
< |
The shared memory segment is used for interprocess communication and |
| 37 |
< |
holds both a message buffer and a number of shared variables. Shared |
| 38 |
< |
memory is allocated to each shared variable using the Allocate function. |
| 39 |
< |
An underlying assumption is that each process using the shared memory |
| 40 |
< |
calls "Allocate" in the same order and for the same memory sizes. |
| 41 |
< |
|
| 42 |
< |
Windows: |
| 43 |
< |
|
| 44 |
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The Windows implementation uses Windows shared memory. This is identified |
| 45 |
< |
by a global name known to every process. There is no security with |
| 46 |
< |
the windows implementation and the shared memory can be read by |
| 47 |
< |
any active process. |
| 48 |
< |
|
| 49 |
< |
} |
| 50 |
< |
|
| 51 |
< |
TSharedMemory = class(TIpcCommon) |
| 52 |
< |
private |
| 53 |
< |
FBuffer: PChar; |
| 54 |
< |
FLastAllocationSize: integer; |
| 55 |
< |
FUnused: integer; |
| 56 |
< |
FBufptr: PChar; |
| 57 |
< |
FSharedBuffer: THandle; |
| 58 |
< |
procedure GetSharedMemory(MemSize: integer); |
| 59 |
< |
public |
| 60 |
< |
constructor Create(MemSize: integer); |
| 61 |
< |
destructor Destroy; override; |
| 62 |
< |
function Allocate(Size: integer): PChar; |
| 63 |
< |
property LastAllocationSize: integer read FLastAllocationSize; |
| 64 |
< |
end; |
| 65 |
< |
|
| 66 |
< |
{TMutex} |
| 67 |
< |
|
| 68 |
< |
TMutex = class(TIpcCommon) |
| 69 |
< |
private |
| 70 |
< |
FMutex: THandle; |
| 71 |
< |
public |
| 72 |
< |
constructor Create(MutexName: string); |
| 73 |
< |
destructor Destroy; override; |
| 74 |
< |
procedure Lock; |
| 75 |
< |
procedure Unlock; |
| 76 |
< |
end; |
| 77 |
< |
|
| 78 |
< |
{ TSingleLockGate } |
| 79 |
< |
|
| 80 |
< |
{ |
| 81 |
< |
A single lock gate is either open or closed. When open, any thread can pass |
| 82 |
< |
through it while, when closed, all threads are blocked as they try to pass |
| 83 |
< |
through the gate. When the gate is opened, all blocked threads are resumed. |
| 84 |
< |
|
| 85 |
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There is an implementation assumption that only one writer thread at |
| 86 |
< |
a time (i.e. the thread which locks or unlocks the gate) can have access to |
| 87 |
< |
it at any one time. I.e. an external Mutex prevents race conditions. |
| 88 |
< |
|
| 89 |
< |
Windows: |
| 90 |
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|
| 91 |
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In the Windows implementation, a Windows Event is used to implement |
| 92 |
< |
the "gate". No additional functionality is required as the behaviour |
| 93 |
< |
of a Windows event meets the requirement. |
| 94 |
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|
| 95 |
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|
| 96 |
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Always initialised to the Unlocked state |
| 97 |
< |
} |
| 98 |
< |
|
| 99 |
< |
TSingleLockGate = class(TIpcCommon) |
| 100 |
< |
private |
| 101 |
< |
FOwner: TGlobalInterface; |
| 102 |
< |
FEvent: THandle; |
| 103 |
< |
public |
| 104 |
< |
constructor Create(EventName: string; AOwner: TGlobalInterface); |
| 105 |
< |
destructor Destroy; override; |
| 106 |
< |
procedure PassthroughGate; |
| 107 |
< |
procedure Unlock; |
| 108 |
< |
procedure Lock; |
| 109 |
< |
end; |
| 110 |
< |
|
| 111 |
< |
{ TMultilockGate } |
| 112 |
< |
|
| 113 |
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{ This type of Gate is used where several reader threads must pass |
| 114 |
< |
through the gate before it can be opened for a writer thread. |
| 115 |
< |
|
| 116 |
< |
The reader threads register their interest by each locking the gate. |
| 117 |
< |
The writer thread then waits on the locked gate until all the reader |
| 118 |
< |
threads have separately unlocked the gate. |
| 119 |
< |
|
| 120 |
< |
There is an underlying assumption of a single writer. A Mutex must |
| 121 |
< |
be used to control access to the gate from the writer side if this |
| 122 |
< |
assumption is invalid. |
| 123 |
< |
|
| 124 |
< |
Windows: |
| 125 |
< |
|
| 126 |
< |
The Windows implementation uses an IPC Event and shared memory to hold |
| 127 |
< |
an integer - the reader count. |
| 128 |
< |
|
| 129 |
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The readers lock the gate by resetting the event and incrementing the |
| 130 |
< |
reader count. They unlock the gate by decrementing the reader count |
| 131 |
< |
and calling set event when the reader count reaches zero. |
| 132 |
< |
|
| 133 |
< |
The writer waits on the event for the gate to open. This is a timed wait |
| 134 |
< |
to avoid the writer being left in an indefinite wait state should a reader |
| 135 |
< |
terminate abnormally. |
| 136 |
< |
|
| 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 |
< |
|
| 1 |
> |
const |
| 2 |
> |
MonitorHookNames: array[0..5] of String = ( |
| 3 |
> |
'FB.SQL.MONITOR.Mutex1_0', |
| 4 |
> |
'FB.SQL.MONITOR.SharedMem1_0', |
| 5 |
> |
'FB.SQL.MONITOR.WriteEvent1_0', |
| 6 |
> |
'FB.SQL.MONITOR.WriteFinishedEvent1_0', |
| 7 |
> |
'FB.SQL.MONITOR.ReadEvent1_0', |
| 8 |
> |
'FB.SQL.MONITOR.ReadFinishedEvent1_0' |
| 9 |
> |
); |
| 10 |
> |
cDefaultTimeout = 1000; { 1 seconds } |
| 11 |
> |
|
| 12 |
> |
type |
| 13 |
> |
TGlobalInterface = class; |
| 14 |
> |
|
| 15 |
> |
{Interprocess Communication Objects. All platform dependent IPC is abstracted |
| 16 |
> |
into this set of objects } |
| 17 |
> |
|
| 18 |
> |
{ TIpcCommon } |
| 19 |
> |
|
| 20 |
> |
TIpcCommon = class |
| 21 |
> |
private |
| 22 |
> |
function GetSa: PSecurityAttributes; |
| 23 |
> |
protected |
| 24 |
> |
FInitialiser: boolean; static; |
| 25 |
> |
FSa : TSecurityAttributes; |
| 26 |
> |
private |
| 27 |
> |
Sd : TSecurityDescriptor; |
| 28 |
> |
public |
| 29 |
> |
constructor Create; |
| 30 |
> |
property Sa : PSecurityAttributes read GetSa; |
| 31 |
> |
end; |
| 32 |
> |
|
| 33 |
> |
{ TSharedMemory } |
| 34 |
> |
|
| 35 |
> |
{ |
| 36 |
> |
The shared memory segment is used for interprocess communication and |
| 37 |
> |
holds both a message buffer and a number of shared variables. Shared |
| 38 |
> |
memory is allocated to each shared variable using the Allocate function. |
| 39 |
> |
An underlying assumption is that each process using the shared memory |
| 40 |
> |
calls "Allocate" in the same order and for the same memory sizes. |
| 41 |
> |
|
| 42 |
> |
Windows: |
| 43 |
> |
|
| 44 |
> |
The Windows implementation uses Windows shared memory. This is identified |
| 45 |
> |
by a global name known to every process. There is no security with |
| 46 |
> |
the windows implementation and the shared memory can be read by |
| 47 |
> |
any active process. |
| 48 |
> |
|
| 49 |
> |
} |
| 50 |
> |
|
| 51 |
> |
TSharedMemory = class(TIpcCommon) |
| 52 |
> |
private |
| 53 |
> |
FBuffer: PChar; |
| 54 |
> |
FLastAllocationSize: integer; |
| 55 |
> |
FUnused: integer; |
| 56 |
> |
FBufptr: PChar; |
| 57 |
> |
FSharedBuffer: THandle; |
| 58 |
> |
procedure GetSharedMemory(MemSize: integer); |
| 59 |
> |
public |
| 60 |
> |
constructor Create(MemSize: integer); |
| 61 |
> |
destructor Destroy; override; |
| 62 |
> |
function Allocate(Size: integer): PChar; |
| 63 |
> |
property LastAllocationSize: integer read FLastAllocationSize; |
| 64 |
> |
end; |
| 65 |
> |
|
| 66 |
> |
{TMutex} |
| 67 |
> |
|
| 68 |
> |
TMutex = class(TIpcCommon) |
| 69 |
> |
private |
| 70 |
> |
FMutex: THandle; |
| 71 |
> |
public |
| 72 |
> |
constructor Create(MutexName: string); |
| 73 |
> |
destructor Destroy; override; |
| 74 |
> |
procedure Lock; |
| 75 |
> |
procedure Unlock; |
| 76 |
> |
end; |
| 77 |
> |
|
| 78 |
> |
{ TSingleLockGate } |
| 79 |
> |
|
| 80 |
> |
{ |
| 81 |
> |
A single lock gate is either open or closed. When open, any thread can pass |
| 82 |
> |
through it while, when closed, all threads are blocked as they try to pass |
| 83 |
> |
through the gate. When the gate is opened, all blocked threads are resumed. |
| 84 |
> |
|
| 85 |
> |
There is an implementation assumption that only one writer thread at |
| 86 |
> |
a time (i.e. the thread which locks or unlocks the gate) can have access to |
| 87 |
> |
it at any one time. I.e. an external Mutex prevents race conditions. |
| 88 |
> |
|
| 89 |
> |
Windows: |
| 90 |
> |
|
| 91 |
> |
In the Windows implementation, a Windows Event is used to implement |
| 92 |
> |
the "gate". No additional functionality is required as the behaviour |
| 93 |
> |
of a Windows event meets the requirement. |
| 94 |
> |
|
| 95 |
> |
|
| 96 |
> |
Always initialised to the Unlocked state |
| 97 |
> |
} |
| 98 |
> |
|
| 99 |
> |
TSingleLockGate = class(TIpcCommon) |
| 100 |
> |
private |
| 101 |
> |
FOwner: TGlobalInterface; |
| 102 |
> |
FEvent: THandle; |
| 103 |
> |
public |
| 104 |
> |
constructor Create(EventName: string; AOwner: TGlobalInterface); |
| 105 |
> |
destructor Destroy; override; |
| 106 |
> |
procedure PassthroughGate; |
| 107 |
> |
procedure Unlock; |
| 108 |
> |
procedure Lock; |
| 109 |
> |
end; |
| 110 |
> |
|
| 111 |
> |
{ TMultilockGate } |
| 112 |
> |
|
| 113 |
> |
{ This type of Gate is used where several reader threads must pass |
| 114 |
> |
through the gate before it can be opened for a writer thread. |
| 115 |
> |
|
| 116 |
> |
The reader threads register their interest by each locking the gate. |
| 117 |
> |
The writer thread then waits on the locked gate until all the reader |
| 118 |
> |
threads have separately unlocked the gate. |
| 119 |
> |
|
| 120 |
> |
There is an underlying assumption of a single writer. A Mutex must |
| 121 |
> |
be used to control access to the gate from the writer side if this |
| 122 |
> |
assumption is invalid. |
| 123 |
> |
|
| 124 |
> |
Windows: |
| 125 |
> |
|
| 126 |
> |
The Windows implementation uses an IPC Event and shared memory to hold |
| 127 |
> |
an integer - the reader count. |
| 128 |
> |
|
| 129 |
> |
The readers lock the gate by resetting the event and incrementing the |
| 130 |
> |
reader count. They unlock the gate by decrementing the reader count |
| 131 |
> |
and calling set event when the reader count reaches zero. |
| 132 |
> |
|
| 133 |
> |
The writer waits on the event for the gate to open. This is a timed wait |
| 134 |
> |
to avoid the writer being left in an indefinite wait state should a reader |
| 135 |
> |
terminate abnormally. |
| 136 |
> |
|
| 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 |
> |
|
