14 Commits (ad6a6170e5514d9d45bae3e7be0268e4d91b4616)

Author	SHA1	Message	Date
Tom Lane	1785acebf2	Introduce local hash table for lock state, as per recent proposal. ... PROCLOCK structs in shared memory now have only a bitmask for held locks, rather than counts (making them 40 bytes smaller, which is a good thing). Multiple locks within a transaction are counted in the local hash table instead, and we have provision for tracking which ResourceOwner each count belongs to. Solves recently reported problem with memory leakage within long transactions.	21 years ago
Tom Lane	fe548629c5	Invent ResourceOwner mechanism as per my recent proposal, and use it to ... keep track of portal-related resources separately from transaction-related resources. This allows cursors to work in a somewhat sane fashion with nested transactions. For now, cursor behavior is non-subtransactional, that is a cursor's state does not roll back if you abort a subtransaction that fetched from the cursor. We might want to change that later.	21 years ago
Tom Lane	573a71a5da	Nested transactions. There is still much left to do, especially on the ... performance front, but with feature freeze upon us I think it's time to drive a stake in the ground and say that this will be in 7.5. Alvaro Herrera, with some help from Tom Lane.	22 years ago
Tom Lane	863aceb54f	Get rid of PID entries in shmem hash table; there is no longer any need ... for them, and making them just wastes time during backend startup/shutdown. Also, remove compile-time MAXBACKENDS limit per long-ago proposal. You can now set MaxBackends as high as your kernel can stand without any reconfiguration/recompilation.	24 years ago
Tom Lane	d8d9ed931e	Add support to lock manager for conditionally locking a lock (ie, ... return without waiting if we can't get the lock immediately). Not used yet, but will be needed for concurrent VACUUM.	25 years ago
Tom Lane	6cc842abd3	Revise lock manager to support "session level" locks as well as "transaction ... level" locks. A session lock is not released at transaction commit (but it is released on transaction abort, to ensure recovery after an elog(ERROR)). In VACUUM, use a session lock to protect the master table while vacuuming a TOAST table, so that the TOAST table can be done in an independent transaction. I also took this opportunity to do some cleanup and renaming in the lock code. The previously noted bug in ProcLockWakeup, that it couldn't wake up any waiters beyond the first non-wakeable waiter, is now fixed. Also found a previously unknown bug of the same kind (failure to scan all members of a lock queue in some cases) in DeadLockCheck. This might have led to failure to detect a deadlock condition, resulting in indefinite waits, but it's difficult to characterize the conditions required to trigger a failure.	25 years ago
Bruce Momjian	52f77df613	Ye-old pgindent run. Same 4-space tabs.	26 years ago
Bruce Momjian	5a017b96ad	Apply contrib patch from Massimo	26 years ago
Bruce Momjian	27b8143944	Hi, ... I have updated my contrib code for version 6.5. In the attachment you will find the directories array, datetime, miscutil, string, tools and userlocks which replace the corresponding directories under contrib. In contrib/tools you will find some developement scripts which I use while hacking the sources. I hope they will be useful for some other people. I have also added a contrib/Makefile which tries to compile and install all the contribs. Unfortunately many of them don't have a Makefile or don't compile cleanly. -- Massimo Dal Zotto	27 years ago
Vadim B. Mikheev	bbf37e9477	typedef struct LTAG ... { Oid relId; Oid dbId; union { BlockNumber blkno; TransactionId xid; } objId; > > Added: > /* > * offnum should be part of objId.tupleId above, but would increase > * sizeof(LOCKTAG) and so moved here; currently used by userlocks only. > */ > OffsetNumber offnum; uint16 lockmethod; /* needed by userlocks */ } LOCKTAG; gmake clean required... User locks are ready for 6.5 release...	27 years ago
Bruce Momjian	07842084fe	pgindent run over code.	27 years ago
Marc G. Fournier	eec4c7366f	From: Massimo Dal Zotto <dz@cs.unitn.it> ...	27 years ago
Bruce Momjian	a32450a585	pgindent run before 6.3 release, with Thomas' requested changes.	28 years ago
Bruce Momjian	951986c550	Update of contrib stuff from massimo.	28 years ago