Add a type class describing types that can serve as locks
Besides the lock order and Show, an additional datum is needed in orderto describe lock inclusion, used, e.g., for group locks. So add a typeclass describing this property.
Signed-off-by: Klaus Aehlig <aehlig@google.com>...
Add missing documentation to exported function listLocks
The module Ganeti.Locking.Allocation exports the function listLocks,hence a documentation string is required. Add it.
Signed-off-by: Klaus Aehlig <aehlig@google.com>Reviewed-by: Petr Pudlak <pudlak@google.com>
Add a module for the Ganeti lock structure
Already provide a module holding the structure of the locksavailable in Ganeti, so that the overall structure of WConfDcan be implemented. The actual locks still have to be added.
Add function describing lock updates
Add the pure part of the mechanism of updating locks. To allowfor efficient waiting on locks, return the set of owners of the lockson which the operation is blocked.
Add data structure representing current lock status
To allow for jobs as processes, a central daemon (wconfd) willhandle allocation and release of locks. Add an appropriate datastructure to describe the current status of the locks.
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