git: use built-in spawn implementation for vfork

This should reduce overhead of spawning git processes
from our long-running httpd and nntpd servers.

1 files changed, 30 insertions, 0 deletions

diff --git a/lib/PublicInbox/ProcessPipe.pm b/lib/PublicInbox/ProcessPipe.pm
new file mode 100644
index 00000000..eade524c
--- /dev/null
+++ b/lib/PublicInbox/ProcessPipe.pm
@@ -0,0 +1,30 @@
+# Copyright (C) 2016 all contributors <meta@public-inbox.org>
+# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+
+# a tied handle for auto reaping of children tied to a pipe, see perltie(1)
+package PublicInbox::ProcessPipe;
+use strict;
+use warnings;
+
+sub TIEHANDLE {
+        my ($class, $pid, $fh) = @_;
+        bless { pid => $pid, fh => $fh }, $class;
+}
+
+sub READ { sysread($_[0]->{fh}, $_[1], $_[2], $_[3] || 0) }
+
+sub READLINE { readline($_[0]->{fh}) }
+
+sub CLOSE { close($_[0]->{fh}) }
+
+sub FILENO { fileno($_[0]->{fh}) }
+
+sub DESTROY {
+        my $fh = delete($_[0]->{fh});
+        close $fh if $fh;
+        waitpid($_[0]->{pid}, 0);
+}
+
+sub pid { $_[0]->{pid} }
+
+1;