Re: [Mingw-users] How to write a "proper" Win32 daemon using MinGW?

[Josue A. G. <jos...@gm...>]

On Tue, Nov 13, 2012 at 9:26 AM, Cristiano Sumariva <sum...@gm...>wrote:

> Maybe is trying to say that he needs only one instance running.
>
> Inter Process Communication?
>
> An alternative if shared memory is available is to write some value at an
> shared scope.
> Then each new program instance should check if this global value( magic
> number ) exists then the second instance should abort or terminate( signal
> on pthreads? ) the second running program.
> Write the PID and program name at shared scope and each new instance
> should check those values are still valid.
>
> Your application will write files, so can not you write a pid file?
>
> Some socket pipe stuff?
>
>
>
The canonical way of "one instance only" check on Win32 is to create a
named mutex (CreateMutex) and check the error (GetLastError)
for ERROR_ALREADY_EXISTS.

josue
josuegomes.com