Allow only one instance of Inno Setup without prompting

Question

I need to allow only one instance of Inno Setup. I used SetupMutex, but when I run the second setup it will prompt the user. I need the setup do nothing and close without any prompt, if another instance is running.

Answer 1

I do not think that what you are trying to do is an improvement to a user experience, quite on the contrary, anyway...

---

Remove your SetupMutex directive and use this code instead:

[Code]

const
  SetupMutexName = 'MyProgSetup';

function InitializeSetup(): Boolean;
begin
  Result := True;
  if CheckForMutexes(SetupMutexName) then
  begin
    Log('Mutex exists, setup is running already, silently aborting');
    Result := False;
  end
    else
  begin
    Log('Creating mutex');
    CreateMutex(SetupMutexName);
  end;
end;

(There's a negligible chance for a race condition between CheckForMutexes and CreateMutex)