Yet another exceptions bug

[Iggy Veresov]

A segmentation fault occures when couple of threads are using
exceptions.
Probably it's a race condition in exception handling code. 
The problem exists both with GCC 2.95.2 and with current GCC 2.96
20000327.
Optimization level doesn't matter. 

OS: RedHat 5.1, linux 2.2.14, glibc 2.1.2, LinuxThreads library that
comes with glibc.

The following code demonstrates the problem:

=======================
// x.cc
// g++ -O3 -lpthread -o x x.cc

#include <pthread.h>
#include <unistd.h>


pthread_t t1,t2;

class X { };

void *thread_1 (void *) {
  while (1) {
    try {
      throw X ();
    }
    catch (...) { }
  }
}

void *thread_2 (void *) {
  while (1) {
    try {
      throw X ();
    }
    catch (...) { }
  }
}

int
main (void)
{

  pthread_create (&t1, NULL, thread_1, NULL);
  pthread_create (&t2, NULL, thread_2, NULL);

  while (1) sleep (1); // wait for a crash..
}  
==========




-- 
/ig, 
mailto:iggy@homepage.ru ,
http://www.homepage.ru/~iggy