Not sure if it was mentioned, but did you look at the
/var/log/DiagnosticMessages log, it should have all the sleep activity
messages.
Tony Romano
On 3/16/11 11:36 AM, "Michael Nickerson" <darkshado...@mac.com> wrote:
>
>On Mar 16, 2011, at 8:37 AM, Matt Gough wrote:
>
>> I've just been adding code to support NSWorkspaceWillSleepNotification.
>>Having lowered my Computer sleep time right down and left the Mac
>>untouched for several minutes, my code never fires and the Mac doesn't
>>actually go to sleep. Even without my app running and leaving the Mac
>>for several hours I notice that it still won't sleep.
>>
>> So it seems that something else is preventing idle sleep, but I've no
>>idea how to find the culprit. Is there some defaults setting I can use
>>that will log what the OS wants to do at sleep time and what is blocking
>>it?
>>
>>
>
>I don't know of a way to log what might be blocking it, but I ran some
>tests a while back that showed the system has to be idle for 10 minutes
>before it will sleep. Or, at least the disk has to be idle for 10
>minutes, otherwise sleep is deferred. I ran into this with one of my
>applications that is long running. It (can) access the disk frequently
>to open and read files. It turned out that was causing my Mac not to
>sleep - definitely not something I wanted to happen.
>
>What I ended up doing was writing a method that fires via a timer every
>minute, and checks the sleep time - if I'm within 10 minutes of it, I
>stop my application from reading anymore. This stopped the problem, so
>far as my own application was concerned, though as others have pointed
>out there's plenty of other things that can keep the system from sleeping
>that you might not have control of.
>
>So, here's a short version of the code I'm using to do this (typed in
>Mail):
>
>#import <IOKit/pwr_mgt/IOPMLib.h>
>#import <IOKit/pwr_mgt/IOPM.h>
>
>- (void)checkIdleTime:(NSTimer *)timer
>{
> unsigned long mins = 0, systemIdleMinutes = 0;
> CFTimeInterval idleSeconds = CGEventSourceSecondsSinceLastEventType(
>kCGEventSourceStateCombinedSessionState, kCGAnyInputEventType );
> static CFTimeInterval lastSeconds = 0.0;
>
> systemIdleMinutes = lrint(idleSeconds / 60.0); /* Gives minutes of
>inactivity */
>
> if ( lastSeconds > idleSeconds ) {
> /* User activity has occurred since last check, if you disabled
>anything you can re-enable it here. */
> }
>
> lastSeconds = idleSeconds;
>
> /* No need to check this if the system isn't idle. */
> if ( systemIdleMinutes ) {
> mach_port_t master_device_port;
> io_connect_t fb = 0;
> kern_return_t kr = kIOReturnSuccess;
> IOReturn err = kIOReturnSuccess;
>
> kr = IOMasterPort( bootstrap_port, &master_device_port );
> if ( kr == kIOReturnSuccess ) {
> fb = IOPMFindPowerManagement( master_device_port );
> if ( fb ) {
> err = IOPMGetAggressiveness( fb, kPMMinutesToSleep, &mins
>);
> if ( (err == kIOReturnSuccess) && (mins > 0) && ((mins -
>systemIdleMinutes) <= 10) ) {
> /* Do whatever you want to notify your app it should
>stop disk access here */
> }
> /* If you want to find out how long until the screen
>dims, you can do the same as above but use kPMMinutesToDim instead. */
> IOServiceClose( fb );
> }
> }
> }
>}
>
>
>Do note one limitation of this as is: if the system is set to sleep in 10
>minutes or less, it will fire the condition as soon as the timer is hit
>and there has been no user activity for at least a minute. This is
>something I've been meaning to look into but haven't as yet.
>
>
>--------------------------------------
>Darkshadow
>(aka Michael Nickerson)
>http://www.nightproductions.net
>
>
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