On Wed, 10 Sep 2014 21:23:28 +0300, Ran Shalit said: > As far as I understand, suspend/respond PM is not per device, but for > all system, > and wakeup source will resume again the whole system. > I think you mean runtime suspend/resume in the answer. The original question didn't specify. You said "suspending that application", not the entire system. And runtime suspend/resume of devices and even the CPU does fit within your original question constraints. If you're looking at system-wide suspend/resume specificially, there's two basic schemes in use: 1) User hits a button, acpid or similar notices, and does a suspend to disk/ram/papertape/whatever. 2) User hits a button, closes the lid, or a user inactivity timer expires. A process notices, and asks all processes which have registered for suspend notifications "Is it OK if we suspend?", and if nobody says "Nay", it does it. If a process complains, it is repeatedly polled until it finishes whatever it was doing and says "OK now".
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