Just a quick patch. This makes the JDBC driver thread safe, which is an

important step towards making the driver compliant, and means that for
some Java applications and servlets, only a single database connection
is
needed, so in a sence this is a nice little show stopper for 6.4 (and
should still be backward compatible to 6.3.2).

Peter

src/interfaces/jdbc/Makefile

@@ -4,7 +4,7 @@
 #    Makefile for Java JDBC interface
 #
 # IDENTIFICATION
-#    $Header: /cvsroot/pgsql/src/interfaces/jdbc/Attic/Makefile,v 1.9 1998/09/03 02:29:41 momjian Exp $
+#    $Header: /cvsroot/pgsql/src/interfaces/jdbc/Attic/Makefile,v 1.10 1998/10/08 00:38:18 momjian Exp $
 #
 #-------------------------------------------------------------------------
 
@@ -137,7 +137,8 @@ EX=	example/basic.class \
 	example/datestyle.class \
 	example/psql.class \
 	example/ImageViewer.class \
-	example/metadata.class
+	example/metadata.class \
+	example/threadsafe.class
 #	example/Objects.class
 
 # This rule builds the examples
@@ -160,7 +161,9 @@ examples:	postgresql.jar $(EX)
 	@echo "  example.psql         Simple java implementation of psql"
 	@echo "  example.Objects      Demonstrates Object Serialisation"
 	@echo " "
+	@echo These are not really examples, but tests various parts of the driver
 	@echo "  example.metadata     Tests various metadata methods"
+	@echo "  example.threadsafe   Tests the driver's thread safety"
 	@echo ------------------------------------------------------------
 	@echo
 
@@ -170,6 +173,6 @@ example/datestyle.class:		example/datestyle.java
 example/psql.class:			example/psql.java
 example/ImageViewer.class:		example/ImageViewer.java
 #example/Objects.class:			example/Objects.java
-
+example/threadsafe.class:		example/threadsafe.java
 example/metadata.class:			example/metadata.java
 #######################################################################

src/interfaces/jdbc/postgresql/Connection.java

@@ -635,8 +635,11 @@ public class Connection implements java.sql.Connection
    * @return a ResultSet holding the results
    * @exception SQLException if a database error occurs
    */
-  public synchronized ResultSet ExecSQL(String sql) throws SQLException
+  public ResultSet ExecSQL(String sql) throws SQLException
   {
+    // added Oct 7 1998 to give us thread safety.
+    synchronized(pg_stream) {
+      
     Field[] fields = null;
     Vector tuples = new Vector();
     byte[] buf = new byte[sql.length()];
@@ -738,6 +741,7 @@ public class Connection implements java.sql.Connection
 	throw final_error;
       return new ResultSet(this, fields, tuples, recv_status, 1);
     }
+  }
   
   /**
    * Receive the field descriptions from the back end

src/interfaces/jdbc/postgresql/fastpath/Fastpath.java

@@ -68,6 +68,9 @@ public class Fastpath
    */
   public Object fastpath(int fnid,boolean resulttype,FastpathArg[] args) throws SQLException
   {
+    // added Oct 7 1998 to give us thread safety
+    synchronized(stream) {
+      
     // send the function call
     try {
       // 70 is 'F' in ASCII. Note: don't use SendChar() here as it adds padding
@@ -154,6 +157,7 @@ public class Fastpath
 	}
     }
     }
+  }
   
   /**
    * Send a function call to the PostgreSQL backend by name.