Thanks so much, y'all! Very helpful! On Sunday, June 24, 2018 at 3:47:48 AM UTC-4, Mike Dewhirst wrote: > > On 23/06/2018 6:17 PM, Melvyn Sopacua wrote: > > On zaterdag 23 juni 2018 02:01:06 CEST Mike Dewhirst wrote: > > > >> Is there a python singleton pattern which might work? > > No, cause the startup is done in 2 different processes which do not > share > > state. So both processes will have a "new singleton". > > This is why you need an IPC mechanism, such as file locks or shared > memory. > > OK. That's very clear. Thank you Melvyn. > > Cheers > > Mike > > > In > > the case of one-off launchers, it's usually easier to implement the > > restrictions on the client side (the program being launched). Long > running > > launchers (like inetd, systemd) can prevent double launch in other ways > as > > they can keep their own state. > >
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