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FIX: "Allow only one copy of DC at a time" under Linux

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This commit is contained in:
Alexander Koblov 2010-07-24 14:17:37 +00:00
commit 85be74baf0
1 changed files with 79 additions and 2 deletions
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81
src/uuniqueinstance.pas
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@ -15,6 +15,7 @@ type
TUniqueInstance = class
private
FHandle: THandle;
FInstanceName: UTF8String;
FServerIPC: TSimpleIPCServer;
FClientIPC: TSimpleIPCClient;
@ -24,6 +25,9 @@ type
procedure CreateServer;
procedure CreateClient;
function IsRunning: Boolean;
procedure DisposeMutex;
public
constructor Create(aInstanceName: String);
destructor Destroy; override;
@ -52,6 +56,11 @@ var
implementation
uses
{$IF DEFINED(MSWINDOWS)}
Windows,
{$ELSEIF DEFINED(UNIX)}
ipc,
{$ENDIF}
StrUtils, FileUtil, uGlobs;
const
@ -95,11 +104,78 @@ begin
FClientIPC:= TSimpleIPCClient.Create(nil);
end;
function TUniqueInstance.IsRunning: Boolean;
{$IF DEFINED(MSWINDOWS)}
var
MutexName: AnsiString;
begin
Result:= False;
MutexName:= ExtractFileName(ParamStr(0));
FHandle:= OpenMutex(MUTEX_MODIFY_STATE, False, PAnsiChar(MutexName));
if FHandle = 0 then
FHandle:= CreateMutex(nil, True, PAnsiChar(MutexName))
else
begin
if WaitForSingleObject(FHandle, 0) <> WAIT_ABANDONED then
Result:= True;
end;
end;
{$ELSEIF DEFINED(UNIX)}
var
semkey: TKey;
status: longint = 0;
arg: tsemun;
function semlock(semid: longint): boolean;
var
p_buf: tsembuf;
begin
p_buf.sem_num := 0;
p_buf.sem_op := 1;
p_buf.sem_flg := SEM_UNDO;
Result:= semop(semid, @p_buf, 1) = 0;
end;
begin
Result := False;
semkey := ftok(PAnsiChar(ParamStr(0)), 0);
FHandle := semget(semkey, 1, IPC_CREAT or IPC_EXCL);
if FHandle = -1 then
begin
FHandle := semget(semkey, 1, 0);
status := semctl(FHandle, 0, SEM_GETVAL, arg);
if status = 1 then
Result := True
else
semlock(FHandle);
end
else
begin
arg.val := 0;
status := semctl(FHandle, 0, SEM_SETVAL, arg);
semlock(FHandle);
end;
end;
{$ENDIF}
procedure TUniqueInstance.DisposeMutex;
{$IF DEFINED(MSWINDOWS)}
begin
ReleaseMutex(FHandle);
end;
{$ELSEIF DEFINED(UNIX)}
var
arg: tsemun;
begin
semctl(FHandle, 0, IPC_RMID, arg);
end;
{$ENDIF}
function TUniqueInstance.IsRunInstance: Boolean;
begin
CreateClient;
FClientIPC.ServerID:= FInstanceName;
Result:= FClientIPC.ServerRunning;
Result:= IsRunning and FClientIPC.ServerRunning;
end;
procedure TUniqueInstance.SendParams;
@ -144,6 +220,7 @@ end;
procedure TUniqueInstance.StopListen;
begin
DisposeMutex;
if FServerIPC = nil then Exit;
FServerIPC.StopServer;
end;
@ -187,4 +264,4 @@ finalization
FreeAndNil(UniqueInstance);
end;
end.