1 files changed, 67 insertions, 0 deletions
diff --git a/lib/PublicInbox/LeiPmdir.pm b/lib/PublicInbox/LeiPmdir.pm
new file mode 100644
index 00000000..5efb012e
--- /dev/null
+++ b/lib/PublicInbox/LeiPmdir.pm
@@ -0,0 +1,67 @@
+# Copyright (C) 2021 all contributors <meta@public-inbox.org>
+# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+
+# WQ worker for dealing with parallel Maildir reads;
+# this does NOT use the {shard_info} field of LeiToMail
+# (and we may remove {shard_info})
+# WQ key: {pmd}
+package PublicInbox::LeiPmdir;
+use strict;
+use v5.10.1;
+use parent qw(PublicInbox::IPC);
+
+sub new {
+        my ($cls, $lei, $ipt) = @_;
+        my $self = bless { -wq_ident => 'lei Maildir worker' }, $cls;
+        my $jobs = $lei->{opt}->{jobs};
+        $jobs =~ /\A[0-9]+,([0-9]+)\z/ and $jobs = $1;
+        my $nproc = $jobs // do {
+                # untested with >=4 CPUs, though I suspect I/O latency
+                # of SATA SSD storage will make >=4 processes unnecessary,
+                # here.  NVMe users may wish to use '-j'
+                my $n = $self->detect_nproc;
+                $n = 4 if $n > 4;
+        };
+        my ($op_c, $ops) = $lei->workers_start($self, $nproc,
+                undef, { ipt => $ipt }); # LeiInput subclass
+        $op_c->{ops} = $ops; # for PktOp->event_step
+        $lei->{pmd} = $self;
+}
+
+sub ipc_atfork_child {
+        my ($self) = @_;
+        my $lei = $self->{lei};
+        $lei->_lei_atfork_child;
+        my $ipt = $self->{ipt} // die 'BUG: no self->{ipt}';
+        $ipt->{lei} = $lei;
+        $ipt->{sto} = $lei->{sto} // die 'BUG: no lei->{sto}';
+        $ipt->{lse} = $ipt->{sto}->search;
+        $ipt->{over} = $ipt->{lse}->over;
+        $ipt->{-lms_ro} //= $ipt->{lse}->lms; # may be undef or '0'
+        $self->SUPER::ipc_atfork_child;
+}
+
+sub each_mdir_fn { # maildir_each_file callback
+        my ($f, $self, @args) = @_;
+        $self->wq_io_do('mdir_iter', [], $f, @args);
+}
+
+sub mdir_iter { # via wq_io_do
+        my ($self, $f, @args) = @_;
+        $self->{ipt}->pmdir_cb($f, @args);
+}
+
+sub pmd_done_wait {
+        my ($arg, $pid) = @_;
+        my ($self, $lei) = @$arg;
+        my $wait = $lei->{sto}->ipc_do('done');
+        $lei->can('wq_done_wait')->($arg, $pid);
+}
+
+sub _lei_wq_eof { # EOF callback for main lei daemon
+        my ($lei) = @_;
+        my $pmd = delete $lei->{pmd} or return $lei->fail;
+        $pmd->wq_wait_old(\&pmd_done_wait, $lei);
+}
+
+1;