Re: EODatabaseContext locking situation
Re: EODatabaseContext locking situation
- Subject: Re: EODatabaseContext locking situation
- From: "Mr. Pierre Frisch" <email@hidden>
- Date: Tue, 6 Nov 2007 13:54:46 -0800
Hi Chuck,
This unfortunately is a real bug. It is quite rare but I had seen it
last year and finally managed to reproduce it consistently last month.
The fix is not in WO 5.4 but will be in the next minor update.
Pierre
--
Pierre Frisch
email@hidden
On Nov 6, 2007, at 9:50, Chuck Hill wrote:
On Nov 6, 2007, at 6:17 AM, Ken Anderson wrote:
Everyone,
I have a significantly multi-threaded app that's having a locking
problem with EODatabaseContext. One thread has successfully locked
an EC and attempted a query. In the stack trace of that thread,
after it has locked the EC, it goes to do a fetch, and this is the
top of the stack trace:
Object.wait(long) line: not available [native method]
NSRecursiveLock(Object).wait() line: 474
NSRecursiveLock.lock() line: 72
EODatabaseContext.lock() line: 1973
EOObjectStoreCoordinator
.addCooperatingObjectStore(EOCooperatingObjectStore) line: 130
EODatabaseChannel.setCurrentEditingContext(EOEditingContext) line:166
It stays here forever. I've checked the few places I actually lock
the DB context, and they're properly protected, and no thread is
anywhere else in EOF but this one.
Any thoughts?? This is 5.3...
One of these must be true:
1. Your JVM is insane
2. You are not handling the explicitly DB context locks correctly in
at least one place and it left a lock hanging
3. One of the other threads _does_ have EOF locked
I have never been driven to this desperation but... You could add a
direct action that gets the DB context, used RTTI to rape out the
NSRecusiveLock and then use RTTI on that to log out which thread has
it locked. When the app deadlocks, hit that DA. With the locking
thread name in hand, look back in the app log and see if you can
see what happened.
Chuck
--
Practical WebObjects - for developers who want to increase their
overall knowledge of WebObjects or who are trying to solve specific
problems.
http://www.global-village.net/products/practical_webobjects
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