a0eaa08ceb
PR libstdc++/60966 * include/std/future (__future_base::_State_baseV2::_M_set_result): Pass lock into _M_do_set and hold it until the function returns. Signal condition variable after call_once completes. (__future_base::_State_baseV2::_M_do_set): Use lock argument. Do not signal here. * testsuite/30_threads/promise/60966.cc: New. From-SVN: r210556
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