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Showing content from https://cplusplus.com/reference/future/packaged_task/make_ready_at_thread_exit/ below:

public member function

std::packaged_task::make_ready_at_thread_exit

void make_ready_at_thread_exit (args... args);

Call stored task and make ready at thread exit

Calls the stored task, forwarding args as its arguments, just like calling its operator() member, but making the shared state ready at thread exit, instead of as soon as the call completes.

If a future object that is associated to the same shared state is waiting on a call to future::get, it stays blocked until the thread ends. Once the thread ends, the call to future::get unblocks and returns or throws an exception.

Notice that calling this function already sets the value in the shared state, and any call that attempts to modify this value between this call and the end of the thread will throw future_error with promise_already_satisfied as error condition.

Parameters

args...: Arguments for the call.
Args... are packaged_task's template parameters, which represent the types of the arguments for the stored task .

Return value none.

Data races The packaged_task is modified.
The shared state is modified as an atomic operation (causing no data races), with synchronization happening at thread end.

Exception safetyBasic guarantee: if an exception is thrown, the packaged_task is in a valid state.

This member function throws an exception on the following conditions:

This member function also throws if any copy or movement of the arguments throws and -depending on the library implementation- may also throw to report other situations.

See also

packaged_task::operator(): Call stored task (public member function)

packaged_task::get_future: Get future (public member function)

future::get: Get value (public member function)

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