clang/libc++ doesn't define boost::mutex::scoped_lock

[timblechmann]

the boost.lockfree testsuite currently does not compile with clang/libc++/linux:

In file included from ../libs/lockfree/test/spsc_queue_stress_test.cpp:20:
../libs/lockfree/test/test_helpers.hpp:41:23: error: no member named 'scoped_lock' in 'boost::mutex'
        boost::mutex::scoped_lock lock (ref_mutex[index]);

compare: http://www.boost.org/development/tests/trunk/developer/lockfree.html

[viboes]

I suspect that the tester is defining BOOST_THREAD_VERSION to 4 so that this deprecated typedef is not included. I suggest you to replace them by lock_guard or unique_lock.

[timblechmann]

i see ... will adapt my code ... but removing this typedef has the potential of breaking a lot of legacy code, so i hope it is just about this one tester. also, would it be possible to mark the typedef as deprecated to get a compiler warning?

[timblechmann]

(In [85196]) lockfree: use lock_guard instead of the deprecated boost::mutex::scoped_lock

fixes #8838