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* include/std/stop_token: Reduce header dependencies by including internal headers. (stop_token::swap(stop_token&), swap(stop_token&, stop_token&)): Define. (operator!=(const stop_token&, const stop_token&)): Fix return value. (stop_token::_Stop_cb::_Stop_cb(Cb&&)): Use std::forward instead of (stop_token::_Stop_state_t) [_GLIBCXX_HAS_GTHREADS]: Use lock_guard instead of unique_lock. [!_GLIBCXX_HAS_GTHREADS]: Do not use mutex. (stop_token::stop_token(_Stop_state)): Change parameter to lvalue reference. (stop_source): Remove unnecessary using-declarations for names only used once. (swap(stop_source&, stop_source&)): Define. (stop_callback(const stop_token&, _Cb&&)) (stop_callback(stop_token&&, _Cb&&)): Replace lambdas with a named function. Use std::forward instead of std::move. Run callbacks if a stop request has already been made. (stop_source::_M_execute()): Remove. (stop_source::_S_execute(_Stop_cb*)): Define. * include/std/version (__cpp_lib_jthread): Define conditionally. * testsuite/30_threads/stop_token/stop_callback.cc: New test. * testsuite/30_threads/stop_token/stop_source.cc: New test. * testsuite/30_threads/stop_token/stop_token.cc: Enable test for immediate execution of callback. From-SVN: r278325
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