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Date:      Fri, 19 Nov 1999 16:31:06 -0700 (MST)
From:      "Russell L. Carter" <rcarter@pinyon.org>
To:        freebsd-current@freebsd.org
Cc:        rcarter@vip.consys.com
Subject:   threads, exceptions, and current
Message-ID:  <199911192331.QAA63190@vip.consys.com>
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Hi,
I'm trying to track down a problem with threads, C++ exceptions and ACE
on -current.  Is the appended little program supposed to work?
If not, why not?  It SIGABRTs immediately after the last throw
with egcs-2.95.2, and also with a month old or so egcs-2.91.66,
stock cc.  Also with LinuxThreads, so it's not libc_r specific.
I am told but cannot verify at the minute that this works on
other platforms.

Thanks,
Russell

$ c++ -pthread -D_THREAD_SAFE ex_test.cpp
$ ./a.out
Throwing Ex:
Caught Ex, now rethrowing it...
Caught Ex thrown from main thread.
Throwing Ex:
Caught Ex, now rethrowing it...
Abort trap (core dumped)
$

ex_test.cpp:

#include <stdio.h>
#include <pthread.h>

class Ex {};

class testEx {
public:
  void throwEx () {
    fprintf(stderr, "Throwing Ex:\n");
    throw Ex (); 
  }
};

void *
f(void *)
{
  testEx thetest;
  thetest.throwEx ();
}

void *
g(void *arg) 
{  
  try {
    f(arg);
  } catch (Ex &ex) {
    fprintf(stderr, "Caught Ex, now rethrowing it...\n");
    throw;
  }
}

int
main (void)
{
  int *arg = 0;
  
  try {
    g((void *) arg);
  } catch (Ex &ex) {
    fprintf(stderr, "Caught Ex thrown from main thread.\n");
  }
  
  pthread_t ex_thread;
  pthread_attr_t *attr = 0;
  
  try {
    pthread_create(&ex_thread, attr, g, (void *) arg);
  } catch (Ex &ex) {
    fprintf(stderr, "Caught Ex thrown from child thread.\n");
  }
  pthread_join(ex_thread, (void **) &arg);
  
  return 0;
}



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