NeilBrown [Fri, 16 Mar 2012 01:49:52 +0000 (12:49 +1100)]
Require process requesting immediate suspend to remain active.
The process that creates 'immediate' must do so while disabling
suspend and must take a lock on the file.
If the process dies, this lock will disappear and auto-suspension
will stop.
This is a good fail-safe for development.
NeilBrown [Thu, 15 Mar 2012 20:40:00 +0000 (07:40 +1100)]
request_suspend: change check for suspend-is-disabled.
Both request_suspend and lsusd try to abort the request if suspend is
disabled. However as they use the same mechanism they can trip over
each other and produce the wrong result.
So leave the primary checking to lsusd. It will remove the 'request'
file if needed, so request_suspend will notice. It can then check
if a suspend actually happened by examining the 'watching' file.
Also: change request_suspend to exit(2) on strange error, and exit(1)
only if suspend was blocked.
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