From: Ken Brown <kbrown@cornell.edu>
To: cygwin-patches@cygwin.com
Subject: [PATCH 09/12] Cygwin: fhandler_fifo::take_ownership: don't set event unnecessarily
Date: Thu, 16 Jul 2020 12:19:12 -0400 [thread overview]
Message-ID: <20200716161915.16994-10-kbrown@cornell.edu> (raw)
In-Reply-To: <20200716161915.16994-1-kbrown@cornell.edu>
Don't set update_needed_evt if there's currently no owner. This will
cause unnecessary churn once I'm the owner and am listening for
connections.
---
winsup/cygwin/fhandler_fifo.cc | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/winsup/cygwin/fhandler_fifo.cc b/winsup/cygwin/fhandler_fifo.cc
index b6e172ddc..fd1695f40 100644
--- a/winsup/cygwin/fhandler_fifo.cc
+++ b/winsup/cygwin/fhandler_fifo.cc
@@ -1186,8 +1186,11 @@ fhandler_fifo::take_ownership ()
return;
}
set_pending_owner (me);
+ /* Wake up my fifo_reader_thread. */
owner_needed ();
- SetEvent (update_needed_evt);
+ if (get_owner ())
+ /* Wake up owner's fifo_reader_thread. */
+ SetEvent (update_needed_evt);
owner_unlock ();
/* The reader threads should now do the transfer. */
WaitForSingleObject (owner_found_evt, INFINITE);
--
2.27.0
next prev parent reply other threads:[~2020-07-16 16:19 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-16 16:19 [PATCH 00/12] FIFO: fix multiple reader support Ken Brown
2020-07-16 16:19 ` [PATCH 01/12] Cygwin: FIFO: fix problems finding new owner Ken Brown
2020-07-16 16:19 ` [PATCH 02/12] Cygwin: FIFO: keep a writer count in shared memory Ken Brown
2020-07-16 16:19 ` [PATCH 03/12] Cygwin: fhandler_fifo::hit_eof: improve reliability Ken Brown
2020-07-16 16:19 ` [PATCH 04/12] Cygwin: FIFO: reduce I/O interleaving Ken Brown
2020-07-16 16:19 ` [PATCH 05/12] Cygwin: FIFO: improve taking ownership in fifo_reader_thread Ken Brown
2020-07-16 16:19 ` [PATCH 06/12] Cygwin: FIFO: fix indentation Ken Brown
2020-07-16 16:19 ` [PATCH 07/12] Cygwin: FIFO: make certain errors non-fatal Ken Brown
2020-07-16 16:19 ` [PATCH 08/12] Cygwin: FIFO: add missing lock Ken Brown
2020-07-16 16:19 ` Ken Brown [this message]
2020-07-16 16:19 ` [PATCH 10/12] Cygwin: FIFO: allow take_ownership to be interrupted Ken Brown
2020-07-16 16:19 ` [PATCH 11/12] Cygwin: FIFO: clean up Ken Brown
2020-07-16 16:19 ` [PATCH 12/12] Cygwin: FIFO: update commentary Ken Brown
2020-07-16 19:57 ` [PATCH 00/12] FIFO: fix multiple reader support Corinna Vinschen
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200716161915.16994-10-kbrown@cornell.edu \
--to=kbrown@cornell.edu \
--cc=cygwin-patches@cygwin.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).