On Jul 2, 2019, at 2:16 AM, Roland Knall <rkn...@gmail.com> wrote:
> Is there a possibility on Windows to avoid sleep and restarts altogether?
> Must be, otherwise video apps would have issues, but that could be connected
> to the drivers right?
SetThreadExecutionState():
https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-setthreadexecutionstate
supports "away mode":
The ES_AWAYMODE_REQUIRED value should be used only when absolutely
necessary by media applications that require the system to perform background
tasks such as recording television content or streaming media to other devices
while the system appears to be sleeping. Applications that do not require
critical background processing or that run on portable computers should not
enable away mode because it prevents the system from conserving power by
entering true sleep.
To enable away mode, an application uses both ES_AWAYMODE_REQUIRED and
ES_CONTINUOUS; to disable away mode, an application calls
SetThreadExecutionStatewith ES_CONTINUOUS and clears ES_AWAYMODE_REQUIRED. When
away mode is enabled, any operation that would put the computer to sleep puts
it in away mode instead. The computer appears to be sleeping while the system
continues to perform tasks that do not require user input. Away mode does not
affect the sleep idle timer; to prevent the system from entering sleep when the
timer expires, an application must also set the ES_SYSTEM_REQUIRED value.
A network is a "medium" - otherwise, why would they have a "{medium, media}
access control" layer? - and a network analyzer is "recording" network traffic
"content", so that sounds as if it's what we should be doing.
This article from 2005:
https://blogs.msdn.microsoft.com/david_fleischman/2005/10/21/what-does-away-mode-do-anyway/
says that "Away Mode is only offered with new PCs"; I don't know whether that
means it requires particular hardware features.
I don't know whether that mode prevents sleep even when you're on battery power.
There's also "system required" mode:
To run properly on a power-managed computer, applications such as fax
servers, answering machines, backup agents, and network management applications
must use both ES_SYSTEM_REQUIRED and ES_CONTINUOUS when they process events.
but I don't know whether that prevents sleeping.
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