watch: wire up IMAP IDLE reapers to DS

We can avoid synchronous `waitpid(-1, 0)' and save a process
when simultaneously watching Maildirs.

One DS bug is fixed: ->Reset needs to clear the DS $in_loop flag
in forked children so dwaitpid() fails and allows git processes
to be reaped synchronously.  TestCommon also calls DS->Reset
when spawning new processes, since t/imapd.t uses DS->EventLoop
while waiting on -watch to write.

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/PublicInbox/TestCommon.pm b/lib/PublicInbox/TestCommon.pm
index b252810f..14ebba10 100644
--- a/lib/PublicInbox/TestCommon.pm
+++ b/lib/PublicInbox/TestCommon.pm
@@ -350,6 +350,7 @@ sub start_script {
         }
         defined(my $pid = fork) or die "fork: $!\n";
         if ($pid == 0) {
+                eval { PublicInbox::DS->Reset };
                 # pretend to be systemd (cf. sd_listen_fds(3))
                 # 3 == SD_LISTEN_FDS_START
                 my $fd;