[c++0x] std::thread fixes

[Jonathan Wakely]

2009/1/22 Benjamin Kosnik:
>
> This is ok: please check it in.

Done. Here's the second part.

        * include/std/thread: Remove unused headers.
        (__thread_data_base): Remove unused mutex and base.
        (thread::~thread): Only detach if joinable.
        (thread::joinable): Test if thread data ptr is empty.
        (thread::_M_thread_data_mutex): Remove.
        (thread::_M_get_thread_data): Remove.
        (thread::_M_make_thread_data): Remove overload, use make_shared.
        (thread::id::id): Make constructor explicit.
        * src/thread.cc (thread::join,thread::detach): Throw if not joinable.
        (thread::_M_start_thread): Break shared_ptr cycle on error.
        (__thread_proxy): Use shared_ptr swap instead of copy and reset.
        * testsuite/30_threads/thread/member/4.cc: New.
        * testsuite/30_threads/thread/member/5.cc: New.

tested x86_64 linux
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