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Figure 1 3. Creating a new project in Visual Studio 2010 Express for Windows Phone Figure 1 4 shows the same window in Visual Studio 2010 Professional with the Windows Phone development tools installed.

Kenner s Dual Mode Driver for Windows (stored in A_DualModeDriverBeta3.zip) can be downloaded from the Files section of Yahoo s p5glove group at http://groups.yahoo.com/group/p5glove/. Linux and Mac drivers can also be found there, along with many other goodies. The Java programming-related files in A_DualModeDriverBeta3.zip are P5DLL.dll, and CP5DLL.java in the subdirectory include/com/essentialreality/. It s easiest to work with a CP5DLL JAR file created like so: javac d . CP5DLL.java jar cvf CP5DLL.jar com // create the com.essentialreality package // roll the package up into a JAR

It is very important to understand that the table cache does not share cached st_table structs between user connection threads. The reason for this is that if a number of concurrently executing threads are executing statements against a table whose schema may change, it would be possible for one thread to change the schema (the .frm file) while another thread is relying on that schema. To avoid these issues, MySQL ensures that each concurrent thread has its own set of st_table structs in the table cache. This feature has confounded some MySQL users in the past when they issue a request like the following: mysql> SHOW STATUS LIKE 'Open_%'; and see a result like this: +---------------+-------+ | Variable_name | Value | +---------------+-------+ | Open_tables | 200 | | Open_files | 315 | | Open_streams | 0 | | Opened_tables | 216 | +---------------+-------+ 4 rows in set (0.03 sec) knowing that they have only ten tables in their database.

Figure 1 4. Creating a new project in Visual Studio 2010 Professional Once everything is installed as required, we are ready to begin.

The reason for the apparently mismatched open table numbers is that MySQL opens a new st_table struct for each concurrent connection. For each opened table, MySQL actually needs two file descriptors (pointers to files on disk): one for the .frm file and another for the .MYD file. The .MYI file is shared among all threads, using the key cache. But just like the key cache, the table cache has only a certain amount of space, meaning that a certain number of st_table structs will fit in there. The default is 64, but this is modifiable using the table_cache configuration variable. As with the key cache, MySQL provides some monitoring variables for you to use in assessing whether the size of your table cache is sufficient: Open_tables: This variable stores the number of table schemas opened by all storage engines for all concurrent threads. Open_files: This variable stores the number of actual file descriptors currently opened by the server, for all storage engines. Open_streams: This will be zero unless logging is enabled for the server. Opened_tables: This variable stores the total number of table schemas that have been opened since the server started, across all concurrent threads. If the Opened_tables status variable is substantially higher than the Open_tables status variable, you may want to increase the table_cache configuration variable. However, be aware of some of the limitations presented by your operating system for file descriptor use. See the MySQL manual for some gotchas: http://dev.mysql.com/doc/mysql/en/table-cache.html.

The resulting JAR file, CP5DLL.jar, should be copied into <JAVA_HOME>\jre\lib\ext and <JRE_HOME>\lib\ext. On my Windows XP test machine, they re the directories c:\Program Files\Java\jdk1.6.0\jre\lib\ext and c:\Program Files\Java\jre1.6.0\lib\ext. The DLL, P5DLL.dll, can be placed in a directory of your choice. I chose c:\Program Files\P5 Glove, the directory created by Essential Reality s P5 installer. Every call to java.exe requires a command-line option to supply the path to the DLL s location. For instance, to run the P5 application, P5Example.java needs the following: java -Djava.library.path="c:\Program Files\P5 Glove" P5Example As in other examples, I use a DOS batch file to reduce typing tedium: runP5 P5Example runP5.bat contains the following: @echo off echo Executing P5 code java -Djava.library.path="c:\Program Files\P5 Glove" %1 echo Finished.