The procedures below proof that boost shared_ptr fails with EINVAL on 
AIX 7.1 if compiled using atomic. 

Note: ilona is our test application which is using the boost library.



preconditions
==============
patched: boost_1_55_0/boost/smart_ptr/detail/lwm_pthreads.hpp
changes: added logging which reports locking errors and class
         ctor/dtor;


patched: ilona.pbp 
changes: only builds ilona static/sharable objects including 
         a simple test application (ilona_activator_test)



build#1
=======
Build boost 1.55 on RHEL6 and AIX71 using identical bootstrap options.


rhel6
-----
boost build: ./log/build-boost_x86_64-pc-linux-rhel6-gnu-64-debug.log
ilona build: ./log/build-ilona_x86_64-pc-linux-rhel6-gnu-64-debug.log 


aix71
-----
boost build: build-boost-aix71-15663342-debug.log
ilona build: build-ilona-aix71-16121982-debug.log


- Both systems do have identical component configuration (check
  both boost logs).
- Both system have no issues when building the boost library 
  including the test application; 
- The files created in the stage/lib for both boost build differ,
  on aix also libboost_atomic.a is created;

	rhel6: libboost_filesystem.a  libboost_program_options.a  libboost_regex.a  libboost_serialization.a  libboost_system.a  libboost_thread.a  libboost_wserialization.a

	aix71: libboost_filesystem.a  libboost_program_options.a	libboost_regex.a  libboost_serialization.a  libboost_system.a  libboost_thread.a   libboost_wserialization.a
				 libboost_atomic.a

- On aix executing ilona_test_activator_test fails, check the ilona build 
	log "build-ilona-aix71-16121982-debug.log";

	A coredump is create: core.5308560.04090902
	A trace trace is provided in file: callstack.log



build#2
=======
Build boost 1.55 on AIX71, only change with build#1 is that compiler 
option -DBOOST_THREAD_DONT_USE_ATOMIC has been defined.


AIX71
-----
boost build: build-boost-aix71-12583090-debug.log
ilona build: build-ilona-aix71-11796734-debug.log


- The files created in the stage/lib are identical to build#1

	aix71: libboost_filesystem.a  libboost_program_options.a	libboost_regex.a  libboost_serialization.a  libboost_system.a  libboost_thread.a   libboost_wserialization.a
				 libboost_atomic.a

- On aix executing ilona_test_activator_test succeeds, check the ilona build 
	log "build-ilona-aix71-11796734-debug.log";


CONCLUSION: when BOOST_THREAD_DONT_USE_ATOMIC is defined no build/runtime errors occur.
            Internally in boost file smart_ptr/detail/lwm_pthreads.hpp is not used anymore.