slskd was capped at one transfer per daemon, on the grounds that
Soulseek peers punish clients that ask for too much. That politeness is
per peer: two different users do not compete for anyone's upload slot.
So one slow peer serialised every other Soulseek download behind it.
The manager now takes a per-(provider, peer) lock before any slot, so a
grab waiting on a busy peer does not hold a provider slot another peer
could use, and the slskd default rises to 3, which now counts peers.
The help text says so.
Running grabs at once exposed the folder collision: slskd names a
download's directory after the remote leaf folder, so two peers'
"Greatest Hits" (or any two rips' "CD1") share one directory, and
collect finds files by name there. Grabs whose local folders overlap
now take a package-level lock per folder, in sorted order, keyed on the
full path because two clients can share one daemon.
Closes#272
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017HJiuc3ZZhxsPXz3ozTirT
