Re: Using Threads?
От | Myron Scott |
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Тема | Re: Using Threads? |
Дата | |
Msg-id | Pine.GSO.4.10.10012032351040.28161-100000@goldengate.kojoworldwide.com. обсуждение исходный текст |
Ответ на | Using Threads? ("Junfeng Zhang" <junfengz@cae.wisc.edu>) |
Ответы |
Re: Using Threads?
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Список | pgsql-hackers |
I maybe wrong but I think that PGSQL is not threaded mostly due to historical reasons. It looks to me like the source has developed over time where much of the source is not reentrant with many global variables throughout. In addition, the parser is generated by flex which can be made to generate reentrant code but is still not thread safe b/c global variables are used. That being said, I experimented with the 7.0.2 source and came up with a multithreaded backend for PGSQL which uses Solaris Threads. It seems to work, but I drifted very far from the original source. I had to hack flex to generate threadsafe code as well. I use it as a linked library with my own fe<->be protocol. This ended up being much much more than I bargained for and looking back would probably not have tried had I known any better. Myron Scott On Mon, 27 Nov 2000, Junfeng Zhang wrote: > Hello all, > > I am new to postgreSQL. When I read the documents, I find out the Postmaster > daemon actual spawns a new backend server process to serve a new client > request. Why not use threads instead? Is that just for a historical reason, > or some performance/implementation concern? > > Thank you very much. > Junfeng >
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