From: pierce at hogranch.com (John R Pierce)
Date: Sat, 15 Mar 2014 22:10:47 -0700
Subject: [Pljava-dev] Is it safe to use multi-threaded PL/Java in
 single-threaded postgres process?
In-Reply-To: <0AF1495BB9BA466CAB0D57C2DCAB44DB@maumau>
References: <30A6B4B499494CED93770BBC4835840C@maumau>
 <A832684586A84610AD7173AB42138F38@maumau>
 <94B1FE06-4C37-488D-84C3-E4E4B0C94D24@me.com>
 <0AF1495BB9BA466CAB0D57C2DCAB44DB@maumau>
Message-ID: <53253257.8070702@hogranch.com>

On 3/15/2014 9:05 PM, MauMau wrote:
> Could you elaborate on this?  The details should be the answer I'm 
> looking for.
> As I said as below, it doesn't seem that PL/Java obeys the JNI spec, 
> because pljava.so is not compiled with -mt, -D_REENTRANT nor 
> -D_POSIX_C_SOURCE.  In short, I'd like to know why it is safe to make 
> JVM to load single-threaded pljava.so.
>
>>> FYI, JNI specification says that the code called from Java VM should 
>>> be built for multi-threading as follows.  But postgres is not. 
'
JNI has two sides to it.      nonjava stuff calling into java, and Java 
calling into non-java.   pl/java implements the first style, non-java 
code (postgres core) calling java.

-- 
john r pierce                                      37N 122W
somewhere on the middle of the left coast