saving state

[zach-schoenberger]

This is a draft proposal for implementing a blocking Select API.

[zhuxiujia]

Adding select may result in reduced performance

[frostyplanet]

Adding select may result in reduced performance

Of course.

This is a draft proposal by zach, which we have discussed on discord. And the proposal does not cover selecting different types of msg. So I might leave it for future reference (and more cases need to be collected )

[frostyplanet]

although it might have some state flaws might lead to deadlock as I fear, I have run zach's version of benchmark, it has only 1/3 performance compared to crossbeam's select,

crossbeam_select/select_mpsc_4_channels/4
                        time:   [72.733 ms 72.919 ms 73.092 ms]
                        thrpt:  [13.681 Melem/s 13.714 Melem/s 13.749 Melem/s]

select_bounded_recv_select_capacities/mpmc_unbiased_first_ready/100
                        time:   [202.06 ms 204.99 ms 206.79 ms]
                        thrpt:  [4.8359 Melem/s 4.8782 Melem/s 4.9489 Melem/s]

I might have a different way of implementation in the future,

[frostyplanet]

select & Multiplex already implemented in the dev branch