mutex (try_lock): Implement generic try_lock.

mutex (try_lock): Implement generic try_lock.

2008-09-28  Chris Fairles <cfairles@gcc.gnu.org>

        * include/std/mutex (try_lock): Implement generic try_lock.
        * testsuite/30_threads/try_lock/1.cc: New.
        * testsuite/30_threads/try_lock/2.cc: Likewise.
        * testsuite/30_threads/try_lock/3.cc: Likewise.
        * testsuite/30_threads/mutex/cons/assign_neg.cc: Adjust line numbers.
        * testsuite/30_threads/mutex/cons/copy_neg.cc: Likewise.
        * testsuite/30_threads/timed_mutex/cons/assign_neg.cc: Likewise.
        * testsuite/30_threads/timed_mutex/cons/copy_neg.cc: Likewise.
        * testsuite/30_threads/recursive_mutex/cons/assign_neg.cc: Likewise.
        * testsuite/30_threads/recursive_mutex/cons/copy_neg.cc: Likewise.
        * testsuite/30_threads/recursive_timed_mutex/cons/assign_neg.cc:
        Likewise.
        * testsuite/30_threads/recursive_timed_mutex/cons/copy_neg.cc: Likewise.

From-SVN: r140729