Synnefo » snf-ganeti » ganeti-local

# Whenever we want to acquire a full LockSet we pass None as the value

ALL_SET = None

class GanetiLockManager:

  """The Ganeti Locking Library

  in a central place, while at the same time doing dynamic checks against

  possible deadlocks. It will also make it easier to transition to a different

  lock type should we migrate away from python threads.

    """Acquire a set of resource locks, at the same level.

    @param level: the level at which the locks shall be acquired;

    @param names: the names of the locks which shall be acquired

        (special lock names, or instance/node names)

    @param shared: whether to acquire in shared mode; by default

    mode, before releasing them.

    @param level: the level at which the locks shall be released;

    @param names: the names of the locks which shall be released

        (defaults to all the locks acquired at that level)

    """Add locks at the specified level.

    @param level: the level at which the locks shall be added;

    @param names: names of the locks to acquire

    @param acquired: whether to acquire the newly added locks

    @param shared: whether the acquisition will be shared