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# Date Author Comment
d2aff862 09/11/2008 12:44 pm Guido Trotter

LockSet: forbid add() on a partially owned set

This patch bans add() on a half-acquired set. This behavior was
previously possible, but created a deadlock if someone tried to acquire
the set-lock in the meantime, and thus is now forbidden. The
testAddRemove unit test is fixed for this new behavior, and includes a...

d4803c24 09/11/2008 12:43 pm Guido Trotter

Fix LockSet._names() to work with the set-lock

If the set-lock is acquired, currently, the _names function will fail on
a double acquire of a non-recursive lock. This patch fixes the behavior,
and some lines of code added to the testAcquireSetLock test check that...

d4f6a91c 08/18/2008 03:51 pm Guido Trotter

A few more locking unit tests

A few more tests written while bug-hunting. One of them shows a real
issue, at last. :)

Reviewed-by: imsnah

90c942d1 08/18/2008 03:50 pm Guido Trotter

Add lock-all-through-GLM unit test

I was hunting for a bug in my code and thought the culprit was in the
locking library, so I added a test to check. Unfortunately turns out it
wasn't. :( Committing the test anyway, while still trying to figure out
what's wrong......

04e1bfaf 07/23/2008 05:23 pm Guido Trotter

Invert nodes/instances locking order

An implementation mistake from the original design caused nodes to be
locked before instances, rather than after. This patch inverts the level
numbering, changing also the relevant unittests and the recursive
locking function starting point....

b10b9d74 07/08/2008 07:32 pm Guido Trotter

Add a more comment lines to testLockingConstants

This is to discourage even more whoever may think that this requirement
is not really useful and can be lifted, and to at least know where it's
used before trying to break it.

Reviewed-by: imsnah

2e1d6d96 07/08/2008 07:31 pm Guido Trotter

Add a new LockSet unittest

This test checks the LockSet behaviour when an empty list is passed.
The current behaviour is expected, but since this is a corner case,
we're safer to keep it under a check, and if we need a different one
monitor that everything is as we expect it to be....

08a6c581 07/08/2008 11:41 am Guido Trotter

Locking: remove LEVEL_CONFIG lockset

Since the ConfigWriter now handles its own locking it's not necessary to
have a specific level for the config in the Locking Manager anymore.
This patch thus removes it, and all the unittest calls that used it, or
depended on it being present....

42a999d1 07/08/2008 11:40 am Guido Trotter

Locking: add ssynchronized decorator

This patch creates a new decorator function ssynchronized in the locking
library, which takes as input a SharedLock, and synchronizes access to
the decorated functions using it. The usual SharedLock semantics apply,
so it's possible to call more than one synchronized function at the same...

dcf315e2 05/01/2008 02:15 pm Guido Trotter

locking: remove obsolete comment

Reviewed-by: iustinp

b2dabfd6 03/04/2008 07:12 pm Guido Trotter

LockSet: handle empty case

A LockSet is mostly useful when it has some locks in it. On the other hand
there are cases in which it must function even when empty. For example if a
cluster has no instances in it there's no reason why locking all of them
shouldn't work anyway. This patch adds test code for that situation and...

b5c0e9d9 03/04/2008 07:12 pm Guido Trotter

LockSet: add missing check code

This check that no operation had been performed before release() was missing in
the test code. Adding it.

Reviewed-by: imsnah

cdb08f44 03/04/2008 04:46 pm Michael Hanselmann

Codestyle updates for locking code

Reviewed-by: ultrotter

3b7ed473 03/04/2008 03:18 pm Guido Trotter

LockSet: make acquire() able to get the whole set

This new functionality makes it possible to acquire a whole set, by passing
"None" to the acquire() function as the list of elements. This will avoid new
additions to the set, and then acquire all the current elements. The list of...

3f404fc5 03/04/2008 03:17 pm Guido Trotter

LockSet: improve remove() api

Lockset's remove() function used to return a list of locks we failed to remove.
Rather than doing this we'll return a list of removed locks, so it's more
similar to how acquire() behaves. This patch also fixes the relevant unit tests....

0cc00929 03/04/2008 03:17 pm Guido Trotter

LockSet: make acquire() return the set of names

In a LockSet acquire() returned True on success. This code changes that to
return a set containing the names of the elements acquired. This is still a
true value if we acquired any lock but is slightly more useful (because if...

7ee7c0c7 03/04/2008 12:09 pm Guido Trotter

Initial GanetiLockManager implementation

Includes some locking-related constants and explanations on how the
LockManager should be used, the class itself and its test cases.

The class includes:
- a basic constructor
- functions to acquire and release lists of locks at the same level...

aaae9bc0 02/28/2008 05:06 pm Guido Trotter

LockSet implementation and unit tests

A LockSet represents locking for a set of resources of the same type. A thread
can acquire multiple resources at the same time, and release some or all of
them, but cannot acquire more resources incrementally at different times...

84152b96 02/21/2008 03:45 pm Guido Trotter

Add a few SharedLock delete() tests

- Check that even a shared acquire() fails on a deleted lock
- Check that delete() fails on a lock you share (must own it or nothing)

These are assumptions I build on in future code, so better check for them.
Currently no code change is necessary for them to be valid....

4354ab03 02/20/2008 03:47 pm Guido Trotter

SharedLock: fix a wrong unit-test helper code

The _doItDelete helper code was supposed to be used to dispatch threads that
deleted the SharedLock. It actually just acquired it exclusively. This remained
unnoticed as the helper thread is just used to test interaction, not the delete...

a95fd5d7 02/19/2008 03:50 pm Guido Trotter

Add the delete() operation to SharedLock

This new operation lets a lock be cleanly deleted. The lock will be exclusively
held before deletion, and after it pending and future acquires will raise an
exception. Other SharedLock operations are modify to deal with delete() and to...

d6646186 02/18/2008 06:58 pm Guido Trotter

Fix a couple of SharedLock docstrings

Use the actual class name rather than a spaced version of it.

Reviewed-by: iustinp

162c1c1f 02/08/2008 01:23 pm Guido Trotter

Shared Lock implementation and unit tests.

Adding a locking.py file for the ganeti locking library. Its first component is
the implementation of a non-recursive blocking shared lock complete with a
testing library.

Reviewed-by: imsnah, iustinp