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std::jthread(3) C++ Standard Libary std::jthread(3) NAME std::jthread - std::jthread Synopsis Defined in header <thread> class jthread; (since C++20) The class jthread represents a single thread of execution. It has the same general behavior as std::thread, except that jthread automatically rejoins on destruction, and can be cancelled/stopped in certain situations. Threads begin execution immediately upon construction of the associ- ated thread object (pending any OS scheduling delays), starting at the top-level function provided as a constructor argument. The return value of the top- level function is ignored and if it terminates by throwing an exception, std::termi- nate is called. The top-level function may communicate its return value or an exception to the caller via std::promise or by modifying shared variables (which may require synchronization, see std::mutex and std::atomic) Unlike std::thread, the jthread logically holds an internal private member of type std::stop_source, which maintains a shared stop-state. The jthread constructor accepts a function that takes a std::stop_token as its first argu- ment, which will be passed in by the jthread from its internal stop_source. This allows the function to check if stop has been requested during its execution, and return if it has. std::jthread objects may also be in the state that does not repre- sent any thread (after default construction, move from, detach, or join), and a thread of execution may be not associated with any jthread objects (after detach). No two std::jthread objects may represent the same thread of execu- tion; std::jthread is not CopyConstructible or CopyAssignable, although it is MoveCon- structible and MoveAssignable. Member types Member type Definition id std::thread::id native_handle_type(not always present) std::thread::native_han- dle_type Member functions constructor constructs new jthread object (public member function) if joinable() is true, calls request_stop() and then join(); in destructor either case destructs the jthread object. (public member function) operator= moves the jthread object (public member function) Observers checks whether the thread is joinable, i.e. po- tentially running joinable in parallel context (public member function) get_id returns the id of the thread (public member function) native_handle returns the underlying implementation-defined thread handle (public member function) hardware_concurrency returns the number of concurrent threads sup- ported by the [static] implementation (public static member function) Operations join waits for the thread to finish its execution (public member function) permits the thread to execute independently from the thread detach handle (public member function) swap swaps two jthread objects (public member function) Stop token handling returns a stop_source object associated with the shared stop get_stop_source state of the thread (public member function) returns a stop_token associated with the shared stop state of get_stop_token the thread (public member function) request_stop requests execution stop via the shared stop state of the thread (public member function) Non-member functions swap(std::jthread) specializes the std::swap algorithm (C++20) (function) Notes Feature-test macro: __cpp_lib_jthread See also thread manages a separate thread (C++11) (class) http://cppreference.com 2022.07.31 std::jthread(3)
NAME | Synopsis | Member types | Member functions | Observers | Operations | Non-member functions | Notes | See also
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