java-programmer >>How do I open a device in non-blocking mode?

How do I open a device in non-blocking mode?

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    Version: 0.222
    Severity: minor
    
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    - --
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  - External process output missingHello,
    
    I'm using Runtime.getRuntime().exec(procedureFile) to run external
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- 16
  - Beanshell self-reference causes memory leakDear All,
    
    I have come across a phenomena in Beanshell, which I am pretty sure is
    a bug. I have put together a very simple test. I wanted to know if
    anyone has already come across this, before I submit a bug report.
    
    I have included below the source for a very simple test which can be
    run from the command line. Although the test prints out memory usage,
    the phenomena is best observed using a memory tool such a JProfiler.
    Unfortunately, I can't attach here a screen-shot from JProfiler to
    graphically illustrate the problem.
    
    The core issue is this:
    If I setup a self-referencing circle with the Interpreter like so (in
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    {
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    This is in contrast to, say a HashSet:
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    This setup does appear to garbage collect when the "this" object goes
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    The code for Test.java is below. Its output follows. Note that after
    the self-referencing setup, roughly 90Kb has not been garbage
    collected, compared with 20Kb for the HashSet and 200 bytes for two
    java objects.
    
    Before tests
    ------------
    10528
    40
    ------------
    Waiting ...
    
    After object ref test
    ---------------------
    26944
    208
    ---------------------
    Waiting ...
    
    After HashSet test
    ------------------
    158280
    22760
    ------------------
    Waiting ...
    
    After Interpreter test
    ----------------------
    362648
    91352
    ----------------------
    Waiting ...
    
    If this test is run with JProfiler, it can be seen that both the
    self-referencing Test objects, and the self-referencing HashSet setup
    are successfully garbage collected.
    
    But JProfiler shows the Interpreter still in memory after the object of
    class Test has gone out of scope - at the very final part of the
    program.
    
    The Interpreter is not garbage collected.
    Obviously, if you do this enough in an application, it will cripple it
    for speed and eventually bomb out with an "Out of heap space" error.
    
    Any thoughts?
    
    Regards,
    
    Stewart
    
    import java.io.*;
    import java.util.*;
    import bsh.*;
    
    public class Test
    {
    private static Runtime r = Runtime.getRuntime();
    private static long baseline = 0L;
    
    public static void main(String[] args)
    throws Exception
    {
    System.gc();
    baseline = (r.maxMemory() - r.freeMemory());
    
    report("Before tests");
    
    twoObjectTest();
    
    report("After object ref test");
    
    hashSetTest();
    
    report("After HashSet test");
    
    interpreterTest();
    
    report("After Interpreter test");
    }
    
    private Test ref = null;
    private HashSet<Test> s = null;
    private Interpreter i = null;
    
    private static void twoObjectTest()
    {
    Test one = new Test();
    Test two = new Test();
    
    one.ref = two;
    two.ref = one;
    }
    
    private static void hashSetTest()
    {
    Test one = new Test();
    
    one.s = new HashSet<Test>();
    one.s.add( one );
    }
    
    private static void interpreterTest()
    throws EvalError
    {
    Test one = new Test();
    
    one.i = new Interpreter();
    one.i.set( "ref", one );
    }
    
    private static void report(String string)
    throws IOException
    {
    char[] lines = new char[string.length()];
    Arrays.fill(lines, '-');
    System.out.println( );
    System.out.println( string );
    System.out.println( lines );
    System.out.println( (r.maxMemory() - r.freeMemory() - baseline) );
    System.gc();
    System.out.println( (r.maxMemory() - r.freeMemory() - baseline) );
    System.out.println( lines );
    System.out.println("Waiting ...");
    new BufferedReader( new InputStreamReader( System.in )).readLine();
    }
    
    /**
    * I thought this might solve the problem, but of course, it never
    gets called.
    */
    protected void finalize()
    throws Throwable
    {
    i.set( "ref", null );
    i.unset( "ref" );
    i = null;
    }
    }

Author

Message

Neil Cherry

Posted: 2008-7-9 22:41:14

Top

java-programmer, How do I open a device in non-blocking mode? I'm a little stuck. I have a Linux device (a character device, like a
serial port) called /dev/cm15a0. I can't use RXTXcomm as it doesn't
recognize the device (and I'm having trouble recompile RXTX). I need
to open the device in non-blocking mode and read and write bytes
to/from the device. Any pointers?

--
Linux Home Automation Neil Cherry email***@***.com
http://www.linuxha.com/ Main site
http://linuxha.blogspot.com/ My HA Blog
Author of: Linux Smart Homes For Dummies

tbsalling

Posted: 2008-7-10 18:31:00

Top

java-programmer >> How do I open a device in non-blocking mode? On 9 Jul., 16:41, Neil Cherry <n...@cookie.uucp> wrote:
> I'm a little stuck. I have a Linux device (a character device, like a
> serial port) called /dev/cm15a0. I can't use RXTXcomm as it doesn't
> recognize the device (and I'm having trouble recompile RXTX). I need
> to open the device in non-blocking mode and read and write bytes
> to/from the device. Any pointers?

Perhaps simply the java.nio package (Java 1.4+)? Or use it through
MINA http://mina.apache.org/.

/Thomas.

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    {
    return someString;
    }
    }
    
    I'm not sure how the static field is being handle using non-static getters/setters.
    Thanks
    Stacey
- 11
  - butting components right up against each otherOn Fri, 27 Jun 2003 13:29:59 GMT, Roedy Green <email***@***.com> wrote:
    
    > On Fri, 27 Jun 2003 14:06:22 +0100, Daniel Dyer
    > <email***@***.com> wrote or quoted :
    >
    >> Sorry, I didn't mean ipadx/ipady, that won't help. You certainly
    >> shouldn't need to use absolute positioning though. Do you have any
    >> sample code to show us?
    > I just wanted to put a string of JTextFields with black backgrounds
    > right against each other so they look like one continuous field.
    
    Have you tried setting the borders on the text fields to null? Maybe it's
    the borders that make it look like there's a gap. Have you tried a
    different layout (maybe try GridLayout, just to see if it looks the same,
    it's much simpler so it will be easier to spot if you've done something
    wrong).
    
    Dan.
    
    --
    Daniel Dyer
    Empathy Software (http://www.empathysoftware.com)
    
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- 12
  - HalfTruth=Lie (was: I'm still waiting for somebody to offer co...)> From: "Phlip" <email***@***.com>
    > The good is the enemy of the best.
    
    A half-truth is a lie.
    A bicycle with only one wheel isn't useful.
    Yin without yang isn't useful.
    A glass half full but not half empty, or vice versa, is not the whole
    picture.
    For nearly every cliche there's an opposite which is equally valid in
    different circumances.
    
    Please choose which of the following activities you would most and
    least like to participate in:
    (1) Have bamboo shoots driven up under your fingernails.
    (2) Undergo Chinese water torture.
    (3) Be trapped in a large tank with one (1) pihrana.
- 13
  - JTable row selection (left and right mouse)Is it possible to be able to allow users to use either the left or the right
    mouse button to select one or more
    rows in a JTable, and upon the selection, be able to tell which mouse button
    they used to select the row(s)?
    
    I have 15 tables on the screen. The user needs to select one or more rows
    from one table (the source)
    and then the same number of rows in another table (the destination) and then
    I need to swap the row
    data from both tables. So, I need a way to differentiate between the
    selections on the source and the
    destination tables.
    
    Thank you.
- 14
  - File upload with JSF.....Hi,
    i'm a new user of java. I have a question. I have to develop a JSF
    application that make user able to:
    
    1) Upload a txt file
    2) Showing to user columns and rows numbers of file.
    
    For this second operation i'have developed a java application that
    receive a txt file from a BufferedReader and counts rows and columns
    number.
    My questions are:
    
    1) How can i realize file upload with JSF?
    2) In which format a file is uploaded?
    3) Can i use my java application for counting rows and columns number
    of file?
    
    Can you help me?Please use easy concepts because i'm inexpert.....
- 15
  - JavaDoc Ignore TagsHi all,
    
    Is it possible to tel JavaDoc to ignore certain XDocLet tags, and/or not raise a warning that it is
    unknown?
    
    I am currently running JavaDoc through an Ant task, and wish to hide the warnings about my
    @hibernate tags.
    
    Regards,
    --