+sub wq_worker_loop ($$) {
+ my ($self, $s2) = @_;
+ my $buf;
+ my $len = $self->{wq_req_len} // (4096 * 33);
+ my ($rec, $sub, @args);
+ while (1) {
+ my (@fds) = $recv_cmd->($s2, $buf, $len) or return; # EOF
+ my $i = 0;
+ my @m = @{$self->{wq_open_modes} // [qw( +<&= >&= >&= )]};
+ for my $fd (@fds) {
+ my $mode = shift(@m);
+ if (open(my $fh, $mode, $fd)) {
+ $self->{$i++} = $fh;
+ } else {
+ die "$$ open($mode$fd) (FD:$i): $!";
+ }
+ }
+ # Sereal dies, Storable returns undef
+ $rec = thaw($buf) //
+ die "thaw error on buffer of size:".length($buf);
+ ($sub, @args) = @$rec;
+ eval { $self->$sub(@args) };
+ warn "$$ wq_worker: $@" if $@;
+ delete @$self{0, 1, 2};
+ }
+}
+
+sub wq_do { # always async
+ my ($self, $sub, $in, $out, $err, @args) = @_;
+ if (my $s1 = $self->{-wq_seq}) { # run in worker
+ $_ = fileno($_) for ($in, $out, $err);
+ $send_cmd->($s1, $in, $out, $err,
+ freeze([$sub, @args]), MSG_EOR);
+ } else {
+ @$self{0, 1, 2} = ($in, $out, $err);
+ eval { $self->$sub(@args) };
+ warn "wq_do: $@" if $@;
+ delete @$self{0, 1, 2};
+ }
+}
+
+# starts workqueue workers if Sereal or Storable is installed
+sub wq_workers_start {
+ my ($self, $ident, $nr_workers, $oldset) = @_;
+ ($enc && $send_cmd && $recv_cmd && defined($SEQPACKET)) or return;
+ return if $self->{-wq_seq}; # idempotent
+ my ($s1, $s2);
+ socketpair($s1, $s2, AF_UNIX, $SEQPACKET, 0) or die "socketpair: $!";
+ my $sigset = $oldset // PublicInbox::DS::block_signals();
+ $self->ipc_atfork_parent;
+ $nr_workers //= 4;
+ $self->{-wq_workers} = {};
+ for my $i (0..($nr_workers - 1)) {
+ defined(my $pid = fork) or die "fork: $!";
+ if ($pid == 0) {
+ eval { PublicInbox::DS->Reset };
+ $s1 = undef;
+ $SIG{$_} = 'IGNORE' for (qw(TERM INT QUIT));
+ local $0 = $ident."[$i]";
+ PublicInbox::DS::sig_setmask($oldset);
+ my $on_destroy = $self->ipc_atfork_child;
+ eval { wq_worker_loop($self, $s2) };
+ die "worker $ident PID:$$ died: $@\n" if $@;
+ exit;
+ } else {
+ $self->{-wq_workers}->{$pid} = $i;
+ }
+ }
+ PublicInbox::DS::sig_setmask($sigset) unless $oldset;
+ $s2 = undef;
+ $self->{-wq_seq} = $s1;
+ $self->{-wq_ppid} = $$;
+}
+
+sub wq_close {
+ my ($self) = @_;
+ delete $self->{-wq_seq} or return;
+ my $ppid = delete $self->{-wq_ppid} // die 'BUG: no wq_ppid';
+ my $workers = delete $self->{-wq_workers} // die 'BUG: no wq_workers';
+ return if $ppid != $$; # can't reap siblings or parents
+ for my $pid (keys %$workers) {
+ dwaitpid($pid, \&ipc_worker_reap, $self);
+ }
+}
+