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Improve LockAcquire API per my recent proposal. All error conditions

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are now reported via elog, eliminating the need to test the result code
at most call sites.  Make it possible for the caller to distinguish a
freshly acquired lock from one already held in the current transaction.
Use that capability to avoid redundant AcceptInvalidationMessages() calls
in LockRelation().
This commit is contained in:
Tom Lane
2005-05-29 22:45:02 +00:00
parent 299c442077
commit 140b078d2a
4 changed files with 81 additions and 69 deletions
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4
contrib/userlock/user_locks.c
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@ -33,8 +33,8 @@ user_lock(uint32 id1, uint32 id2, LOCKMODE lockmode)
SET_LOCKTAG_USERLOCK(tag, id1, id2);
return LockAcquire(USER_LOCKMETHOD, &tag, InvalidTransactionId,
lockmode, true);
return (LockAcquire(USER_LOCKMETHOD, &tag, InvalidTransactionId,
lockmode, true) != LOCKACQUIRE_NOT_AVAIL);
}
int