Add support for generic notifier lists

Notifiers are data-less callbacks and a notifier list is a list of registered
notifiers that all are interested in a particular event.

We'll use this in a few patches to implement mouse change notification.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
---
v1 -> v2
 - Do not do memory allocations by placing list nodes in notifier
3 files changed
tree: cf8518783ecd1737ea4eb00ac1be7c7ed4d048f0
  1. audio/
  2. block/
  3. bsd-user/
  4. darwin-user/
  5. default-configs/
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  270. x_keymap.c
  271. x_keymap.h