From 6732ce6edcf1562d3e126ed02f96466ab07c498e Mon Sep 17 00:00:00 2001 From: Gabriel Schneider Date: Tue, 29 Sep 2026 00:40:03 -0300 Subject: A desktop session holds 64 panes, and every route that finds none free says so Sixteen panes was far too few for a real session. MAX_PANES is now 64 on a desktop and stays 16 on the board; the 48 more slots cost about 3.7 KB each in fixed tables (the core 1.33 to 1.45 MB, its surface 19 to 72 KB), and a pane itself (84 KB and its terminal) is allocated only when it opens. At the cap, pane/new fails with `pane/new: no pane slots: 64 max` and an err record rather than a bare ENFILE, a 9P look or exec that would open a pane fails its write with the same words and reads back empty, and New, Tty, Tutor and Alt-n say it on the message row (their ctl writes fail with it). Co-Authored-By: Claude Opus 5.5 --- src/Messages.zig | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'src/Messages.zig') diff --git a/src/Messages.zig b/src/Messages.zig index 8b6c795d..7d284e6b 100644 --- a/src/Messages.zig +++ b/src/Messages.zig @@ -445,10 +445,22 @@ pub fn messageLog(m: *const Messages, i: usize) ?*const LoggedMessage { } /// `: `: FileNotFound reads "file not found". +/// What a route that would open a pane says when every slot is taken. +pub const no_pane_slots = "no pane slots: {d} max"; + pub fn reportError(p: *Pardes, id: usize, operation: []const u8, err: anyerror) void { var buf: [256]u8 = undefined; var w = std.Io.Writer.fixed(&buf); w.print("{s}: ", .{operation}) catch {}; + // Every route that opens a pane says the cap the same way. + if (err == error.NoPaneSlots) { + w.print(no_pane_slots, .{pardes.MAX_PANES}) catch {}; + // A 9P look or exec that would open the pane fails with it too. + p.fs.no_pane_slot = true; + @memcpy(p.fs.ename[0..w.buffered().len], w.buffered()); + p.fs.no_pane_slot_len = @intCast(w.buffered().len); + return reportFailure(p, id, w.buffered()); + } for (@errorName(err), 0..) |c, i| { if (std.ascii.isUpper(c) and i > 0) w.writeByte(' ') catch break; w.writeByte(std.ascii.toLower(c)) catch break; -- cgit v1.3