Async can't utilize KanalPtr as effective as Sync

[fereidani]

With the addition of KanalPtr with 92c8f58 and 65e9102 we got these performance gains for SPSC benchmark for usize bounded(0) channel:
sync_kanal 1333923 messages per second
sync_pre7 920740 messages per second
sync_gain 30.98
async_current 9843154 messages per second
async_pre7 9723400 messages per second
async_gain 1.22

as you can see we got a 31 percent performance boost in sync but only 1 percent for async.
I need some help reviewing the async part to find out why we didn't receive a similar gain as sync.

[fereidani]

The problem is solved with the new implementation of the signal.