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Re: [cdt-dev] GDB hangs after a series of commands?

It could be a console problem. I remember seeing bug reports about large output blocking the console.

On 20/04/2010 1:02 PM, James Blackburn wrote:
It looks like your're using CDI. One thing that can make it hang is if
GDB itself is blocked trying to write to one of its output streams
(stdout and stderr).  Before CDT 7 we never read from stderr, so if
there's periodic output here, GDB eventually locks up.

It's worth finding out what the other end is doing -- attach another
to the gdb eclipse is talking to to find out...


On 20 April 2010 17:45, Steve Goodrich<steve.goodrich@xxxxxxxxxx>  wrote:
I'm working on a custom View in the context of CDI.  I have a valid
MISession, and I'm hammering it with commands:

        CLICommand cli = new CLICommand("test");
        MIOOBRecord oobRecord[] = null;
        for (int i = 0; i<  2000; i++) {
                System.out.println(String.format("%4d - sending", i));
                try {
                        miSession.postCommand(cli, MISession.FOREVER);
                        System.out.println(String.format("%4d - waiting",
                        oobRecord =
                        System.out.println(String.format("%4d - completed",
                } catch (Exception e) {
                        System.out.println(String.format("%4d - exception:
", i) + e.getMessage());

I'm able to go through this loop about 900 times, and then my debug session
will hang.  The last debug output I have is this (the exception is expected
since "test" is not a valid GDB command):

         890 - sending
         890 - waiting
         890 - exception: Undefined command: "test".  Try "help".
         891 - sending

And now Eclipse is hung.  The call stack looks like this:

        Thread [main] (Suspended)
                Object.wait(long) line: not available [native method]
                PipedInputStream.awaitSpace() line: not available
                PipedInputStream.receive(byte[], int, int) line: not
                PipedOutputStream.write(byte[], int, int) line: not
                PipedOutputStream(OutputStream).write(byte[]) line: not
                MISession.writeToConsole(String) line: 831
                MISession.postCommand0(Command, long) line: 591
                MISession.postCommand(Command, long) line: 573
                MyView.testloop(boolean) line: 602

I don't have the PipedOutputStream or PipedInputStream sources, so the
lowest level at which I have visibility is here:

        protected void writeToConsole(String text) {
                OutputStream console = getConsolePipe();
                if (console != null) {
                        try {
                                console.write(text.getBytes()); //<<<<<<<<
hangs somewhere in here
                        catch(IOException e) {

Does this make sense to anyone?  Aside from "don't do that to GDB", is there
something obvious I'm doing wrong?  Is there some pacing I need to follow
when dealing with MISession?  Is there some way to get more information on
this so I can figure out what's happening?

        -- Steve G.

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