From: Takashi Yano <takashi.yano@nifty.ne.jp>
To: cygwin-developers@cygwin.com
Subject: Re: cygrunsrv + sshd + rsync = 20 times too slow -- throttled?
Date: Thu, 2 Sep 2021 17:15:49 +0900 [thread overview]
Message-ID: <20210902171549.72910cf8e01c822233bfc56a@nifty.ne.jp> (raw)
In-Reply-To: <YS894Ll9Qdwop1bd@calimero.vinschen.de>
[-- Attachment #1: Type: text/plain, Size: 1862 bytes --]
On Wed, 1 Sep 2021 10:46:24 +0200
Corinna Vinschen wrote:
> On Sep 1 17:23, Takashi Yano wrote:
> > On Wed, 1 Sep 2021 10:07:48 +0200
> > Corinna Vinschen wrote:
> > > On Sep 1 09:16, Takashi Yano wrote:
> > > > On Wed, 1 Sep 2021 08:02:20 +0900
> > > > Takashi Yano wrote:
> > > > > On Tue, 31 Aug 2021 17:50:14 +0200
> > > > > Corinna Vinschen wrote:
> > > > > > So for the time being I suggest the below patch on top of topic/pipe.
> > > > > > It contains everything we discussed so far.
> > > > >
> > > > > One more thing. 'git log' cannot stop normally with 'q' with your patch.
> > > >
> > > > The same happes with 'yes |less'.
> > > >
> > > > The cause is that write side cannot detect closing read side because
> > > > query_hdl (read handle) is still opened.
> > >
> > > Oh
> > >
> > > my
> > >
> > > god.
> > >
> > >
> > > That kills the entire idea of keeping the read handle :(
> >
> > One idea is:
> >
> > Count read handle and write handle opned using NtQueryObject().
> > If the numbers of opened handle are equal each other, only
> > the write side (pair of write handle and query_hdl) is alive.
> > In this case, write() returns error.
> > If read side is alive, number of read handles is greater than
> > number of write handles.
>
> Interesting idea. But where do you do the count? The event object
> will not get signalled, so WFMO will not return when performing a
> blocking write.
I imagined something like attached patch.
Unfortunately, the attached patch seems to have bug that
occasionally causes the following error while building
cygwin1.dll.
<command-line>: error: "GCC_VERSION" redefined [-Werror]
<command-line>: note: this is the location of the previous definition
cc1plus: all warnings being treated as errors
make[1]: *** [Makefile:1942: fhandler_proc.o] Error 1
--
Takashi Yano <takashi.yano@nifty.ne.jp>
[-- Attachment #2: count-rw-handle.patch --]
[-- Type: application/octet-stream, Size: 5129 bytes --]
diff --git a/winsup/cygwin/fhandler.h b/winsup/cygwin/fhandler.h
index 1f0f28077..38390848f 100644
--- a/winsup/cygwin/fhandler.h
+++ b/winsup/cygwin/fhandler.h
@@ -1172,6 +1172,7 @@ class fhandler_pipe: public fhandler_base
{
private:
HANDLE query_hdl;
+ HANDLE reader_evt;
pid_t popen_pid;
size_t max_atomic_write;
void set_pipe_non_blocking (bool nonblocking);
@@ -1181,6 +1182,7 @@ public:
bool ispipe() const { return true; }
HANDLE get_query_handle () const { return query_hdl; }
+ bool reader_closed ();
void set_popen_pid (pid_t pid) {popen_pid = pid;}
pid_t get_popen_pid () const {return popen_pid;}
diff --git a/winsup/cygwin/fhandler_pipe.cc b/winsup/cygwin/fhandler_pipe.cc
index 2d9e87bb3..4773d04da 100644
--- a/winsup/cygwin/fhandler_pipe.cc
+++ b/winsup/cygwin/fhandler_pipe.cc
@@ -51,6 +51,8 @@ fhandler_pipe::set_pipe_non_blocking (bool nonblocking)
fpi.ReadMode = FILE_PIPE_BYTE_STREAM_MODE;
fpi.CompletionMode = nonblocking ? FILE_PIPE_COMPLETE_OPERATION
: FILE_PIPE_QUEUE_OPERATION;
+ if (get_device () == FH_PIPEW)
+ fpi.CompletionMode = FILE_PIPE_COMPLETE_OPERATION;
status = NtSetInformationFile (get_handle (), &io, &fpi, sizeof fpi,
FilePipeInformation);
if (!NT_SUCCESS (status))
@@ -308,6 +310,22 @@ fhandler_pipe::raw_read (void *ptr, size_t& len)
}
else if (status == STATUS_THREAD_CANCELED)
pthread::static_cancel_self ();
+
+ if ((ssize_t)len > 0)
+ SetEvent (reader_evt);
+}
+
+bool
+fhandler_pipe::reader_closed (void)
+{
+ if (get_device () == FH_PIPER)
+ return false;
+ OBJECT_BASIC_INFORMATION obi;
+ NtQueryObject (get_handle (), ObjectBasicInformation, &obi, sizeof obi, NULL);
+ int n_writer = obi.HandleCount;
+ NtQueryObject (query_hdl, ObjectBasicInformation, &obi, sizeof obi, NULL);
+ int n_reader = obi.HandleCount;
+ return n_writer == n_reader;
}
ssize_t __reg3
@@ -323,6 +341,13 @@ fhandler_pipe::raw_write (const void *ptr, size_t len)
if (!len)
return 0;
+ if (reader_closed ())
+ {
+ set_errno(EPIPE);
+ raise(SIGPIPE);
+ return -1;
+ }
+
if (len <= max_atomic_write)
chunk = len;
else if (is_nonblocking ())
@@ -400,10 +425,24 @@ fhandler_pipe::raw_write (const void *ptr, size_t len)
/* NtWriteFile returns success with # of bytes written == 0
if writing on a non-blocking pipe fails because the pipe
buffer doesn't have sufficient space. */
- if (nbytes_now == 0 && nbytes == 0)
+ if (nbytes_now == 0 && nbytes == 0 && is_nonblocking ())
set_errno (EAGAIN);
- ptr = ((char *) ptr) + chunk;
+ ptr = ((char *) ptr) + nbytes_now;
nbytes += nbytes_now;
+ if (reader_closed () && nbytes == 0)
+ {
+ set_errno(EPIPE);
+ raise(SIGPIPE);
+ }
+ if (!is_nonblocking () && nbytes < len)
+ {
+ if (nbytes_now == 0)
+ {
+ cygwait (reader_evt);
+ ResetEvent (reader_evt);
+ }
+ continue;
+ }
}
else if (STATUS_PIPE_IS_CLOSED (status))
{
@@ -430,9 +469,14 @@ fhandler_pipe::raw_write (const void *ptr, size_t len)
void
fhandler_pipe::fixup_after_fork (HANDLE parent)
{
+ if (close_on_exec() && query_hdl)
+ CloseHandle (query_hdl);
if (query_hdl)
fork_fixup (parent, query_hdl, "query_hdl");
fhandler_base::fixup_after_fork (parent);
+ if (!close_on_exec ())
+ DuplicateHandle (parent, reader_evt, GetCurrentProcess (), &reader_evt,
+ 0, 1, DUPLICATE_SAME_ACCESS);
}
int
@@ -453,6 +497,9 @@ fhandler_pipe::dup (fhandler_base *child, int flags)
ftp->close ();
res = -1;
}
+ DuplicateHandle (GetCurrentProcess (), reader_evt,
+ GetCurrentProcess (), &ftp->reader_evt,
+ 0, 1, DUPLICATE_SAME_ACCESS);
debug_printf ("res %d", res);
return res;
@@ -463,7 +510,11 @@ fhandler_pipe::close ()
{
if (query_hdl)
NtClose (query_hdl);
- return fhandler_base::close ();
+ int ret = fhandler_base::close ();
+ if (get_device () == FH_PIPER)
+ SetEvent (reader_evt);
+ CloseHandle (reader_evt);
+ return ret;
}
#define PIPE_INTRO "\\\\.\\pipe\\cygwin-"
@@ -678,6 +729,10 @@ fhandler_pipe::create (fhandler_pipe *fhs[2], unsigned psize, int mode)
else
res = 0;
}
+ fhs[0]->reader_evt = CreateEvent (NULL, true, false, NULL);
+ DuplicateHandle (GetCurrentProcess (), fhs[0]->reader_evt,
+ GetCurrentProcess (), &fhs[1]->reader_evt,
+ 0, 1, DUPLICATE_SAME_ACCESS);
debug_printf ("%R = pipe(%d, %y)", res, psize, mode);
return res;
diff --git a/winsup/cygwin/select.cc b/winsup/cygwin/select.cc
index dc1f79613..0905b3d38 100644
--- a/winsup/cygwin/select.cc
+++ b/winsup/cygwin/select.cc
@@ -741,6 +741,13 @@ out:
}
if (s->write_selected && dev != FH_PIPER)
{
+ if (dev == FH_PIPEW && ((fhandler_pipe *) fh)->reader_closed ())
+ {
+ gotone += s->write_ready = true;
+ if (s->except_selected)
+ gotone += s->except_ready = true;
+ return gotone;
+ }
/* For the write side of a pipe, fetch the handle to the read side.
See the longish comment in pipe_data_available for the reasoning. */
if (dev == FH_PIPEW)
next prev parent reply other threads:[~2021-09-02 8:15 UTC|newest]
Thread overview: 250+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <41A583E1-C8E7-42AB-9F24-EEC33A41EC60@house.org>
[not found] ` <20210825201845.07b6400b79dc5558a7761efe@nifty.ne.jp>
[not found] ` <f8106fe7-a2b8-d106-3061-4d888124f4b0@cornell.edu>
[not found] ` <20210826062934.54f2f2216021c095bb7ba13b@nifty.ne.jp>
[not found] ` <d0a8c57d-1ed1-6b4f-c6e7-cbe0e2ec8a1c@cornell.edu>
[not found] ` <3b560051-ab27-f392-ca4b-d1fd9b5733b0@cornell.edu>
[not found] ` <20210827202440.47706fc2fc07c5e9a1bc0047@nifty.ne.jp>
[not found] ` <4f2cb5f3-ce9c-c617-f65f-841a5eca096e@cornell.edu>
[not found] ` <20210828022111.91ef5b4ff24f6da9fadb489e@nifty.ne.jp>
[not found] ` <YSn3L0W1M527utK0@calimero.vinschen.de>
[not found] ` <20210828184102.f2206a8a9e5fe5cf24bf5e45@nifty.ne.jp>
[not found] ` <YSok0PoCQn2TPPrn@calimero.vinschen.de>
[not found] ` <20210829004346.c2f80469abc3a07fd4b2918d@nifty.ne.jp>
[not found] ` <e8caa02f-be85-33bc-3f09-347c1cdb0923@cornell.edu>
[not found] ` <20210829174124.0c1ae6c16a3e8da1f490abc7@nifty.ne.jp>
[not found] ` <6e9bb35e-6f4f-cf78-e515-549da487b5ef@cornell.edu>
2021-08-30 7:57 ` Corinna Vinschen
[not found] ` <20210829180729.48b4e877f773cb3980c5766d@nifty.ne.jp>
[not found] ` <789f056a-f164-d71d-1dc9-230f5a41846d@cornell.edu>
2021-08-30 8:27 ` Corinna Vinschen
2021-08-30 13:00 ` Corinna Vinschen
2021-08-30 13:20 ` Corinna Vinschen
2021-08-30 13:41 ` Ken Brown
2021-08-30 14:12 ` Corinna Vinschen
2021-08-30 14:52 ` Ken Brown
2021-08-30 15:15 ` Corinna Vinschen
[not found] ` <20210830043756.8aa0ada77db0bfbbe3889f62@nifty.ne.jp>
[not found] ` <47e5dd74-b940-f305-fd5a-c6c9d8f41305@cornell.edu>
2021-08-30 8:48 ` Corinna Vinschen
[not found] ` <c62d18df-ab7a-7233-62ee-29a8eced5353@cornell.edu>
[not found] ` <20210830091314.f9a2cb71794d0f68cdb5eba7@nifty.ne.jp>
[not found] ` <20210830092259.52f7d54fc3fa340738373af4@nifty.ne.jp>
[not found] ` <d217ef03-7858-5e22-0aa6-f0507eedd9da@cornell.edu>
[not found] ` <20210830170204.fa91eaf110f310f13b67abc3@nifty.ne.jp>
2021-08-30 10:20 ` Corinna Vinschen
2021-08-30 10:38 ` Corinna Vinschen
2021-08-30 12:04 ` Takashi Yano
2021-08-30 12:55 ` Corinna Vinschen
2021-08-30 13:31 ` Corinna Vinschen
2021-08-31 8:50 ` Takashi Yano
2021-08-30 13:51 ` Ken Brown
2021-08-30 15:00 ` Ken Brown
2021-08-30 15:19 ` Corinna Vinschen
2021-08-30 15:43 ` Ken Brown
2021-08-31 9:43 ` Corinna Vinschen
2021-08-31 8:52 ` Takashi Yano
2021-08-31 9:04 ` Corinna Vinschen
2021-08-31 11:05 ` Takashi Yano
2021-08-31 15:20 ` Corinna Vinschen
2021-09-01 2:39 ` Takashi Yano
2021-09-01 8:03 ` Corinna Vinschen
2021-09-01 8:13 ` Corinna Vinschen
2021-08-30 13:36 ` Ken Brown
2021-08-30 14:05 ` Corinna Vinschen
2021-08-30 15:53 ` Corinna Vinschen
2021-08-30 17:00 ` Corinna Vinschen
2021-08-30 17:11 ` Corinna Vinschen
2021-08-30 18:59 ` Ken Brown
2021-08-30 19:12 ` Ken Brown
2021-08-30 20:21 ` Corinna Vinschen
2021-08-30 20:14 ` Corinna Vinschen
2021-08-30 20:47 ` Ken Brown
2021-08-31 8:55 ` Takashi Yano
2021-08-31 9:08 ` Corinna Vinschen
2021-08-31 9:25 ` Takashi Yano
2021-08-31 10:05 ` Corinna Vinschen
2021-08-31 10:18 ` Corinna Vinschen
2021-08-31 11:45 ` Takashi Yano
2021-08-31 12:31 ` Takashi Yano
2021-08-31 15:08 ` Corinna Vinschen
2021-08-31 12:33 ` Ken Brown
2021-08-31 15:18 ` Corinna Vinschen
2021-08-31 15:27 ` Corinna Vinschen
2021-08-31 15:50 ` Corinna Vinschen
2021-08-31 16:19 ` Ken Brown
2021-08-31 16:38 ` Ken Brown
2021-08-31 17:30 ` Corinna Vinschen
2021-08-31 18:54 ` Ken Brown
2021-08-31 19:51 ` Corinna Vinschen
2021-08-31 23:02 ` Takashi Yano
2021-09-01 0:16 ` Takashi Yano
2021-09-01 8:07 ` Corinna Vinschen
2021-09-01 8:23 ` Takashi Yano
2021-09-01 8:46 ` Corinna Vinschen
2021-09-01 12:56 ` Ken Brown
2021-09-01 13:52 ` Corinna Vinschen
2021-09-01 23:02 ` Ken Brown
2021-09-02 8:17 ` Corinna Vinschen
2021-09-02 13:01 ` Ken Brown
2021-09-02 19:00 ` Corinna Vinschen
2021-09-02 19:34 ` Ken Brown
2021-09-02 19:35 ` Corinna Vinschen
2021-09-02 20:19 ` Ken Brown
2021-09-03 9:12 ` Corinna Vinschen
2021-09-03 19:00 ` Ken Brown
2021-09-03 19:53 ` Ken Brown
2021-09-03 19:54 ` Corinna Vinschen
2021-09-03 20:05 ` Ken Brown
2021-09-03 10:00 ` Takashi Yano
2021-09-03 10:13 ` Takashi Yano
2021-09-03 11:31 ` Corinna Vinschen
2021-09-03 11:41 ` Corinna Vinschen
2021-09-03 12:13 ` Ken Brown
2021-09-03 15:00 ` Corinna Vinschen
2021-09-03 15:14 ` Ken Brown
2021-09-03 15:17 ` Corinna Vinschen
2021-09-03 12:22 ` Takashi Yano
2021-09-03 13:27 ` Ken Brown
2021-09-03 15:37 ` Corinna Vinschen
2021-09-04 12:02 ` Takashi Yano
2021-09-04 12:37 ` Takashi Yano
2021-09-04 14:04 ` Ken Brown
2021-09-04 23:15 ` Takashi Yano
2021-09-05 13:40 ` Takashi Yano
2021-09-05 13:50 ` Takashi Yano
2021-09-05 18:47 ` Ken Brown
2021-09-05 19:42 ` Takashi Yano
2021-09-05 20:09 ` Takashi Yano
2021-09-05 20:27 ` Ken Brown
2021-09-06 8:13 ` Corinna Vinschen
2021-09-06 11:16 ` Takashi Yano
2021-09-06 12:49 ` Corinna Vinschen
2021-09-06 13:16 ` Takashi Yano
2021-09-06 16:08 ` Corinna Vinschen
2021-09-06 23:39 ` Takashi Yano
2021-09-07 9:14 ` Corinna Vinschen
2021-09-07 11:03 ` Takashi Yano
2021-09-07 16:14 ` Ken Brown
2021-09-07 18:26 ` Corinna Vinschen
2021-09-03 10:38 ` Takashi Yano
2021-09-08 11:32 ` Takashi Yano
2021-09-08 11:55 ` Corinna Vinschen
2021-09-08 12:33 ` Takashi Yano
2021-09-08 17:43 ` Ken Brown
2021-09-08 18:28 ` Corinna Vinschen
2021-09-02 8:15 ` Takashi Yano [this message]
2021-09-02 18:54 ` Corinna Vinschen
2021-09-07 3:26 ` Takashi Yano
2021-09-07 10:50 ` Takashi Yano
2021-09-08 0:07 ` Takashi Yano
2021-09-08 4:11 ` Takashi Yano
2021-09-08 9:01 ` Takashi Yano
2021-09-08 9:01 ` Corinna Vinschen
2021-09-08 9:26 ` Corinna Vinschen
2021-09-08 9:45 ` Takashi Yano
2021-09-08 10:04 ` Corinna Vinschen
2021-09-08 10:45 ` Takashi Yano
2021-09-08 10:51 ` Corinna Vinschen
2021-09-09 3:21 ` Takashi Yano
2021-09-09 9:37 ` Corinna Vinschen
2021-09-09 10:55 ` Takashi Yano
2021-09-09 11:41 ` Corinna Vinschen
2021-09-08 9:37 ` Takashi Yano
2021-09-09 3:41 ` Takashi Yano
2021-09-09 8:05 ` Takashi Yano
2021-09-09 12:19 ` Takashi Yano
2021-09-09 12:42 ` Takashi Yano
2021-09-09 21:53 ` Takashi Yano
2021-09-10 3:41 ` Takashi Yano
2021-09-10 10:57 ` Ken Brown
2021-09-10 15:17 ` Ken Brown
2021-09-10 15:26 ` Corinna Vinschen
2021-09-10 22:57 ` Takashi Yano
2021-09-11 2:17 ` Ken Brown
2021-09-11 2:35 ` Takashi Yano
2021-09-11 13:12 ` Ken Brown
2021-09-12 6:23 ` Takashi Yano
2021-09-12 14:39 ` Ken Brown
2021-09-13 9:11 ` Corinna Vinschen
2021-09-13 12:30 ` Ken Brown
2021-09-12 8:48 ` Takashi Yano
2021-09-12 11:04 ` Takashi Yano
2021-09-12 15:10 ` Ken Brown
2021-09-12 21:46 ` Ken Brown
2021-09-12 23:54 ` Takashi Yano
2021-09-13 2:19 ` Ken Brown
2021-09-13 8:40 ` Takashi Yano
2021-09-13 12:51 ` Ken Brown
2021-09-13 17:05 ` Ken Brown
2021-09-13 9:42 ` Corinna Vinschen
2021-09-13 13:03 ` Ken Brown
2021-09-13 18:39 ` Takashi Yano
2021-09-12 23:41 ` Takashi Yano
2021-09-13 17:42 ` Ken Brown
2021-09-13 18:54 ` Takashi Yano
2021-09-13 18:32 ` Corinna Vinschen
2021-09-13 19:37 ` Takashi Yano
2021-09-13 20:15 ` Corinna Vinschen
2021-09-14 8:07 ` Takashi Yano
2021-09-14 8:47 ` Corinna Vinschen
2021-09-14 12:38 ` Ken Brown
2021-09-14 14:15 ` Corinna Vinschen
2021-09-14 8:08 ` Takashi Yano
2021-09-14 9:03 ` Corinna Vinschen
2021-09-14 9:56 ` Takashi Yano
2021-09-14 10:19 ` Takashi Yano
2021-09-14 11:03 ` Corinna Vinschen
2021-09-14 12:05 ` Takashi Yano
2021-09-14 14:17 ` Corinna Vinschen
2021-09-14 22:14 ` Ken Brown
2021-09-15 0:21 ` Takashi Yano
2021-09-15 0:44 ` Takashi Yano
2021-09-15 0:59 ` Takashi Yano
2021-09-15 9:57 ` Corinna Vinschen
2021-09-15 10:48 ` Takashi Yano
2021-09-15 10:58 ` Takashi Yano
2021-09-15 11:34 ` Corinna Vinschen
2021-09-15 11:40 ` Corinna Vinschen
2021-09-15 11:13 ` Corinna Vinschen
2021-09-15 11:41 ` Ken Brown
2021-09-15 11:49 ` Corinna Vinschen
2021-09-15 11:54 ` Takashi Yano
2021-09-15 12:20 ` Corinna Vinschen
2021-09-15 13:04 ` Takashi Yano
2021-09-15 13:42 ` Corinna Vinschen
2021-09-15 16:22 ` Ken Brown
2021-09-15 17:09 ` Ken Brown
2021-09-16 0:22 ` Takashi Yano
2021-09-16 2:28 ` Ken Brown
2021-09-16 9:09 ` Takashi Yano
2021-09-16 13:02 ` Takashi Yano
2021-09-16 13:25 ` Corinna Vinschen
2021-09-16 14:27 ` Takashi Yano
2021-09-16 15:01 ` Corinna Vinschen
2021-09-16 15:46 ` Ken Brown
2021-09-16 16:02 ` Ken Brown
2021-09-16 19:42 ` Takashi Yano
2021-09-16 20:28 ` Ken Brown
2021-09-16 19:48 ` Ken Brown
2021-09-16 20:01 ` Takashi Yano
2021-09-17 2:25 ` Ken Brown
2021-09-17 8:31 ` Takashi Yano
2021-09-17 11:16 ` Ken Brown
2021-09-17 16:23 ` Takashi Yano
2021-09-17 17:08 ` Ken Brown
2021-09-17 17:39 ` Jon Turney
2021-09-17 17:43 ` Takashi Yano
2021-09-17 19:53 ` Ken Brown
2021-09-18 1:30 ` Takashi Yano
2021-09-18 2:07 ` Ken Brown
2021-09-18 2:10 ` Ken Brown
2021-09-18 8:03 ` Takashi Yano
2021-09-18 11:12 ` Ken Brown
2021-09-18 11:35 ` Takashi Yano
2021-09-18 14:11 ` Jon Turney
2021-09-18 13:44 ` Ken Brown
2021-09-19 1:31 ` Takashi Yano
2021-09-19 14:35 ` Ken Brown
2021-09-20 9:29 ` Takashi Yano
2021-09-16 0:13 ` Takashi Yano
2021-09-16 2:26 ` Ken Brown
2021-09-13 9:07 ` Corinna Vinschen
2021-09-20 12:52 ` Takashi Yano
2021-09-20 19:14 ` Ken Brown
2021-09-20 21:09 ` Ken Brown
2021-09-20 21:21 ` Ken Brown
2021-09-20 21:27 ` Takashi Yano
2021-09-20 21:39 ` Ken Brown
2021-09-20 22:16 ` Takashi Yano
2021-09-20 22:46 ` Ken Brown
2021-09-20 22:50 ` Ken Brown
2021-09-20 23:22 ` Takashi Yano
2021-09-21 8:30 ` Takashi Yano
2021-09-21 9:26 ` Mark Geisert
2021-09-21 10:10 ` Takashi Yano
2021-09-21 21:10 ` Mark Geisert
2021-09-21 13:31 ` Ken Brown
2021-09-21 15:36 ` Takashi Yano
2021-09-21 18:51 ` Ken Brown
2021-09-23 8:26 ` Takashi Yano
2021-09-23 13:03 ` Ken Brown
2021-09-23 15:03 ` Takashi Yano
2021-09-23 16:29 ` Ken Brown
2021-10-18 10:51 ` Corinna Vinschen
2021-10-18 12:02 ` Takashi Yano
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