Re: [systemd-devel] Having synchronization between 2 process using systemd.
On Fri, Jan 20, 2017 at 12:20 PM, Raghavendra. H. R wrote: > Hi All, > > I have a scenario in which I have 2 processes and both acts as Server & > Client. > Process A starts it server & tries to connect as client with Process B. > Process B starts it server & tries to connect as client with Process A. > > We want handle this kind of scenario with the help of systemd sd_notify or > with the help of runlevels or any other mechanism. > Overall, such mutual dependencies seem a bit odd... Socket activation (systemd.socket) might work here: * process A tries to connect to B's socket * kernel queues the connection while B starts * process B accepts waiting connection on the inherited socket * process B tries to connect to A's socket * A is already started, accepts connection Another option would be to have the processes notify each other once they're "ready", e.g. by sending D-Bus signals or using some POSIX IPC features: * both processes start independently * both processes set up a listening socket, broadcast a ready signal over D-Bus, and wait for another process' ready signal * process B receives A's signal and connects to A * process A receives B's signal and connects to B -- Mantas Mikulėnas ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/systemd-devel
Re: [systemd-devel] Having synchronization between 2 process using systemd.
Am 20.01.2017 um 11:20 schrieb Raghavendra. H. R: I have a scenario in which I have 2 processes and both acts as Server & Client. Process A starts it server & tries to connect as client with Process B. Process B starts it server & tries to connect as client with Process A. We want handle this kind of scenario with the help of systemd sd_notify or with the help of runlevels or any other mechanism. Kindly share some needful inputs whether it is possible in systemd. We dont want to get add delay in any process when each of them talks to the other you need to solve that in the services itself because it would be a cyclic dependency and so what can systemd more do than fire up the services? your service needs a loop in the client which tries to connect until it was successful ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/systemd-devel
[systemd-devel] Having synchronization between 2 process using systemd.
Hi All, I have a scenario in which I have 2 processes and both acts as Server & Client. Process A starts it server & tries to connect as client with Process B. Process B starts it server & tries to connect as client with Process A. We want handle this kind of scenario with the help of systemd sd_notify or with the help of runlevels or any other mechanism. Kindly share some needful inputs whether it is possible in systemd. We dont want to get add delay in any process. -- Regards, Raghavendra. H. R (Raghu) ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/systemd-devel