ActivityMonitor: fixed minor issue CID 609788.

* If the circular buffer was created with a size of zero, fBuffer would
be freed without being initialized.

* CircularBuffer is now save to use even if the buffer allocation failed. This
fixes bug #3985.
* This happened as ViewHistory::Update() can obviously be called before the
view is really layouted. Therefore it now restricts the view size to 16384.
* Since the Update() happens in Draw(), it looks like this is actually a problem
of our layout engine (as the size is computed via BView::Frame()).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@30967 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Added a ViewHistory class that stores the current values, so they don't have
to be interpolated everytime. This class also makes sure that the values are
always from the same offsets, so the flickering is gone.
* Need to use SetMouseEventMask() or else the mouse up will be ignored when
changing the resolution via dragging the mouse.
* Fixed a bug that prevented the DataHistory data interpolation from working
correctly.
* The refresh threads are now working at B_URGENT_DISPLAY_PRIORITY, making the
view updates much more stable with less jitter.
* Removed the draw refresh, and have it always be the same as the value
refresh.
* Added lower refresh intervals (25, and 75 ms).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29950 a95241bf-73f2-0310-859d-f6bbb57e9c96

* The beginnings of an activity monitor application. Very bare and feature-less
right now, but it's already working (and shows that we better compute our
system_info::cached_pages field directly).
* I am not sure if we want to keep this app here, merge it with
ProcessController, or have it as a separate (3rdparty) app. Opinions welcome.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24846 a95241bf-73f2-0310-859d-f6bbb57e9c96

ActivityMonitor: fixed minor issue CID 609788.

* If the circular buffer was created with a size of zero, fBuffer would
be freed without being initialized.

* CircularBuffer is now save to use even if the buffer allocation failed. This
fixes bug #3985.
* This happened as ViewHistory::Update() can obviously be called before the
view is really layouted. Therefore it now restricts the view size to 16384.
* Since the Update() happens in Draw(), it looks like this is actually a problem
of our layout engine (as the size is computed via BView::Frame()).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@30967 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Added a ViewHistory class that stores the current values, so they don't have
to be interpolated everytime. This class also makes sure that the values are
always from the same offsets, so the flickering is gone.
* Need to use SetMouseEventMask() or else the mouse up will be ignored when
changing the resolution via dragging the mouse.
* Fixed a bug that prevented the DataHistory data interpolation from working
correctly.
* The refresh threads are now working at B_URGENT_DISPLAY_PRIORITY, making the
view updates much more stable with less jitter.
* Removed the draw refresh, and have it always be the same as the value
refresh.
* Added lower refresh intervals (25, and 75 ms).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29950 a95241bf-73f2-0310-859d-f6bbb57e9c96

* The beginnings of an activity monitor application. Very bare and feature-less
right now, but it's already working (and shows that we better compute our
system_info::cached_pages field directly).
* I am not sure if we want to keep this app here, merge it with
ProcessController, or have it as a separate (3rdparty) app. Opinions welcome.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24846 a95241bf-73f2-0310-859d-f6bbb57e9c96