Re: [Boost-users] Compatibility between shared_ptr and Rational RoseRT

From: Ross Manges (ross.manges_at_[hidden])
Date: 2005-04-26 16:01:06

> Attaching the code (in whatever form is convenient to you) is fine.
OK, I've attached some sample code I made up to show the kind of problems
I'm having (the code doesn't do anything useful).  Running this code
results in the backtrace below.  I am aware that this code breaks the
condition that the shared_ptr needs to have exclusive writing
modifications; however, I am unsure how to fix the code to make it
correct.  Please let me know if you have any suggestions, thanks! (BTW,
I'm running against the Boost CVS which I downloaded on Fri, Apr 22nd; if
I run against version 1_32, the backtrace is in the scope_lock instead of
atomic_increment)

some info about my system:
Red Hat Enterprise Linux 3, running 2.4.21-4.ELsmp
(on a dual-processor dell with xeon's, if that matters)

and here's the backtrace:
(gdb) bt
#0  0x0804a703 in atomic_increment (pw=0x21006) at
sp_counted_base_gcc_x86.hpp:59
#1  0x0804a655 in boost::detail::sp_counted_base::add_ref_copy
(this=0x21002) at sp_counted_base_gcc_x86.hpp:133
#2  0x0804a4d7 in boost::detail::shared_count::operator= (this=0xb191cde8,
r=@0xb731e004) at shared_count.hpp:181
#3  0x08049a58 in boost::shared_ptr<Element>::operator= (this=0xb191cde4,
r=@0xb731e000) at shared_ptr.hpp:148
#4  0x0804b089 in SimpleQueue::pop (this=0x804f290) at ../SimpleQueue.cpp:22
#5  0x080494ef in CommonThread::operator() (this=0x8050470) at
../CommonThread.cpp:11
#6  0x0804a06d in
boost::detail::function::void_function_obj_invoker0<CommonThread,
void>::invoke (function_obj_ptr=
      {obj_ptr = 0x8050470, const_obj_ptr = 0x8050470, func_ptr =
0x8050470, data = "p"}) at function_template.hpp:136
#7  0xb75ce283 in boost::thread_group::size ()
   from
/home/auser/devel/boost_cvs_install/lib/libboost_thread-gcc-mt-1_32.so.1.32.0
#8  0xb7493e21 in pthread_start_thread () from /lib/i686/libpthread.so.0
#9  0xb743208a in clone () from /lib/i686/libc.so.6