| From: | Fernando <proyectolsd(at)wanadoo(dot)es> |
|---|---|
| To: | pgsql-general(at)postgresql(dot)org |
| Subject: | Lock questions |
| Date: | 2003-11-18 17:01:52 |
| Message-ID: | 20031118170149.ACFA63C03C@smtp.latinmail.com |
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| Thread: | |
| Lists: | pgsql-general |
Hello,
i've been reading the README file in the lmgr folder (in src/backend/storage/lmgr/) and i have a couple of questions about locks:
- What's the difference between the Lightweight Locks (LWLocks) and the Regular locks (Heavyweight Locks)? For example, if i do a query and it needs a lock, would it be a lightweight one or a regular one?
- There are two lock methods, DEFAULT and USER. Where can I get more information about them? In the README file it says that "USER locks are non-blocking", how could this be?
Thank you very much!
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