Re: GCJ + Roguewave Threads?

[Johann Hibschman <johannh at gmail dot com>]

On Fri, 11 Feb 2005 13:29:45 -0500, Bryce McKinlay <mckinlay@redhat.com> wrote:
> >My hair-brained scheme for tomorrow is to see if I can launch a
> >proper, GC-registered pthread from the main thread, and then use that
> >thread for all subsequent gcj work, leaving the Rogue Wave threads to
> >do their dirty business in the original thread.
> >
> Seems reasonable - just be sure to synchronize the threads correctly if
> you take this route.

Well, I can't seem to get it to work.  After I initialize the JVM, all
subsequent calls to pthread_exit(NULL) simply hang.

I'm still using 3.2.3-42, which may account for some of the problems;
I'll keep working on it.

My basic code runs as follows:

#include <iostream>

#define LINUX_THREADS 1
#include <gc.h>
#include <gcj/cni.h>

using namespace std;

namespace
{
  static void* doTest2(void *threadId)
  {
    std::cout << "[thr2] Hello, world!  Now calling pthread_exit."
              << std::endl;
    pthread_exit(NULL);
  }
}

int main(int argc, char** argv)
{
  std::cout << "[main] Argc = " << argc << std::endl;
  std::cout << "[main] CONSTRUCTING THE JVM!!!" << std::endl;
  JvCreateJavaVM(NULL);
  std::cout << "[main] Done constructing the jvm." << std::endl;
  JvAttachCurrentThread(NULL, NULL);
  std::cout << "[main] Done attaching the thread." << std::endl;

  pthread_t thread;
  int rc;
  rc = GC_pthread_create(&thread, NULL, doTest2, NULL);
  if (rc)
  {
    std::cout << "[main] ERROR: return code = " << rc << std::endl;
  }
  std::cout << "[main] About to detach thread" << std::endl;
  JvDetachCurrentThread();
  std::cout << "[main] About to call pthread_exit" << std::endl;
  pthread_exit(NULL);
  std::cout << "[main] About to exit" << std::endl;
  return 0;
}

When I run this, I see:

[main] Argc = 1
[main] CONSTRUCTING THE JVM!!!
[main] Done constructing the jvm.
[main] Done attaching the thread.
[thr2] Hello, world!  Now calling pthread_exit.
[main] About to detach thread
[main] About to call pthread_exit 

Am I doing something obviously wrong here?  I'm not even trying to run
anything in the JVM; I just want to use a thread at the same time, as
a first step.

Thanks,

Johann