[PostgreSQL-Hackers] Needs Suggestion

[PostgreSQL-Hackers] Needs Suggestion

	Robert Haas
	Sep 2, 2010 at 8:25 pm

On Mon, Aug 30, 2010 at 11:12 AM, wrote:
Can anyone explain this ?

My question is -
What is lnext:; , lreplace:; in postgres code ?
I found lnext:; in 1501 and lreplace:; in 2065 in execMain.c file.

It's a label.

http://www.lysator.liu.se/c/bwk-tutor.html#goto

--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise Postgres Company

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Subham: Can anyone explain this ? My question is - What is lnext:; , lreplace:; in postgres code ? I found lnext:; in 1501 and lreplace:; in 2065 in execMain.c file. -- Thank You, Subham Roy. CSE, IIT Bombay.

Follow ups

Subham: How can I increase the stack depth limit ? Is it only by modifying the postgres.conf file, but there I cannot increase the stack depth beyond 4 MB. Actually, my problem is that, when I set the stack base address of the child thread using the POSIX library function "pthread_setstackaddr()", I am unable to access the memory contents of its parent. The data-structures in the parent are either getting destroyed or unaccessible when moving to the context of the child thread. But when I create the
Heikki Linnakangas: It is not a good idea to use threads in server code. PostgreSQL server code is not thread-safe, things will break. Assuming that you're not actually doing that but using threads in the client instead, max_stack_depth should have no effect on you as it only affects the server. But you really should find another way to communicate between threads. Stacks should be treated as thread-private. Use malloc() or something and global variables. -- Heikki Linnakangas EnterpriseDB
Subham: Actually, I used palloc() to set the stack base address. And I am trying to create only a single thread, then also it is causing problem. Actually, I created all the data-structures using palloc(), then I am passing these to the child thread. Even if I make these variables global then also it is not working. But if I don't set its stack address then it is working. But I need to do that because when my thread body is big then it is causing stack fault. So if I cannot set its stack address then

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group	pgsql-hackers @
categories	postgresql
posted	Aug 4, '10 at 6:35p
active	Sep 23, '10 at 12:40p
posts	11
users	5
website	postgresql.org...
irc	#postgresql

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