On 01 Feb 2014, at 21:32, Ove Kåven <o...@arcticnet.no> wrote: > If a synchronization starts with the screen off, there's a chance that the > phone enters "deep suspend" during the synchronization. If so, the other side > might time out and the sync will fail. > > So I want prevent the CPU from suspending before the synchronization is > complete, which might take a few seconds (and there might not be network > activity all the time while it's running). I've read that to get periodic > wakeups, you could use libiphb or maybe timed, but what's the recommended way > to temporarily prevent suspending completely for a few seconds?
You can talk to MCE via the system D-Bus, this is quite low-level, but works already: https://github.com/nemomobile/mce-dev/blob/master/include/mce/dbus-names.h#L329 To quote the documentation: * The idea is: if some process needs to do non-interactive * background processing, it can prevent the system from * entering late suspend by * * 1) get timer period via #MCE_CPU_KEEPALIVE_PERIOD_REQ call * * 2) call #MCE_CPU_KEEPALIVE_START_REQ * * 3) repeat #MCE_CPU_KEEPALIVE_START_REQ calls in interval * that is shorter than the maximum obtained at (1) * * 4) call #MCE_CPU_KEEPALIVE_STOP_REQ when finished * * MCE keeps track of active clients and blocks late suspend * until all clients have called #MCE_CPU_KEEPALIVE_STOP_REQ, * lost D-Bus connection (exit, crash, ...) or all timeouts * have been missed. There might be a higher-level API for this in the future (Qt-flavored C++ and QML), for a preview, see: https://github.com/nemomobile/nemo-keepalive HTH :) Thomas _______________________________________________ SailfishOS.org Devel mailing list
