From: Stefan Metzmacher <metze@samba.org>
To: "David Laight" <David.Laight@ACULAB.COM>,
"André Almeida" <andrealmeid@collabora.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Ingo Molnar" <mingo@redhat.com>,
"Peter Zijlstra" <peterz@infradead.org>,
"Darren Hart" <dvhart@infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"Steven Rostedt" <rostedt@goodmis.org>,
"Sebastian Andrzej Siewior" <bigeasy@linutronix.de>
Cc: "kernel@collabora.com" <kernel@collabora.com>,
"krisman@collabora.com" <krisman@collabora.com>,
"pgriffais@valvesoftware.com" <pgriffais@valvesoftware.com>,
"z.figura12@gmail.com" <z.figura12@gmail.com>,
"joel@joelfernandes.org" <joel@joelfernandes.org>,
"malteskarupke@fastmail.fm" <malteskarupke@fastmail.fm>,
"linux-api@vger.kernel.org" <linux-api@vger.kernel.org>,
"fweimer@redhat.com" <fweimer@redhat.com>,
"libc-alpha@sourceware.org" <libc-alpha@sourceware.org>,
"linux-kselftest@vger.kernel.org"
<linux-kselftest@vger.kernel.org>,
"shuah@kernel.org" <shuah@kernel.org>,
"acme@kernel.org" <acme@kernel.org>,
"corbet@lwn.net" <corbet@lwn.net>,
io-uring <io-uring@vger.kernel.org>
Subject: Re: [RFC PATCH v2 00/13] Add futex2 syscall
Date: Mon, 8 Mar 2021 12:55:47 +0100 [thread overview]
Message-ID: <2f3e8fd5-acc9-1617-f161-7357d3e15307@samba.org> (raw)
In-Reply-To: <f594f043f5c7440d8e3534e9a14c97c4@AcuMS.aculab.com>
Am 08.03.21 um 12:11 schrieb David Laight:
> From: Stefan Metzmacher
>> Sent: 07 March 2021 11:35
>>
>> Hi André,
>>> ** The wait on multiple problem
>>>
>>> The use case lies in the Wine implementation of the Windows NT interface
>>> WaitMultipleObjects. This Windows API function allows a thread to sleep
>>> waiting on the first of a set of event sources (mutexes, timers, signal,
>>> console input, etc) to signal.
>
> They are all events.
> You can only wait on either events or sockets (using select).
> There is a socket api to signal an event when data arrives (etc).
> There is also the insane (these days) restriction of 64 events.
Ok.
>> With that in mind would it be good to have some interaction with epoll (and similar calls)?
>
> Or hook something up so that pollwakeup can kick a futex as well
> as waking up poll() and adding an event to epoll().
I guess as FUTEX_FD was already there and was removed we can stop this discussion.
If there will every be the need to an async call, I guess a io_uring based one would
be the best...
metze
next prev parent reply other threads:[~2021-03-08 11:56 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-04 0:42 [RFC PATCH v2 00/13] Add futex2 syscall André Almeida
2021-03-04 0:42 ` [RFC PATCH v2 01/13] futex2: Implement wait and wake functions André Almeida
2021-03-04 0:42 ` [RFC PATCH v2 02/13] futex2: Add support for shared futexes André Almeida
2021-03-04 0:42 ` [RFC PATCH v2 03/13] futex2: Implement vectorized wait André Almeida
2021-03-04 0:42 ` [RFC PATCH v2 04/13] futex2: Implement requeue operation André Almeida
2021-03-04 0:42 ` [RFC PATCH v2 05/13] futex2: Add compatibility entry point for x86_x32 ABI André Almeida
2021-03-04 0:42 ` [RFC PATCH v2 06/13] docs: locking: futex2: Add documentation André Almeida
2021-03-04 0:42 ` [RFC PATCH v2 07/13] selftests: futex2: Add wake/wait test André Almeida
2021-03-04 0:42 ` [RFC PATCH v2 08/13] selftests: futex2: Add timeout test André Almeida
2021-03-04 0:42 ` [RFC PATCH v2 09/13] selftests: futex2: Add wouldblock test André Almeida
2021-03-04 0:42 ` [RFC PATCH v2 10/13] selftests: futex2: Add waitv test André Almeida
2021-03-04 0:42 ` [RFC PATCH v2 11/13] selftests: futex2: Add requeue test André Almeida
2021-03-04 0:42 ` [RFC PATCH v2 12/13] perf bench: Add futex2 benchmark tests André Almeida
2021-03-04 0:42 ` [RFC PATCH v2 13/13] kernel: Enable waitpid() for futex2 André Almeida
2021-03-04 5:44 ` [RFC PATCH v2 00/13] Add futex2 syscall Peter Oskolkov
2021-03-04 18:58 ` André Almeida
2021-03-05 20:03 ` Peter Oskolkov
2021-03-05 20:08 ` Peter Oskolkov
2021-03-04 15:01 ` Theodore Ts'o
2021-03-04 19:15 ` André Almeida
2021-03-07 11:34 ` Stefan Metzmacher
2021-03-07 11:56 ` Daurnimator
2021-03-08 11:52 ` Stefan Metzmacher
2021-03-08 11:11 ` David Laight
2021-03-08 11:55 ` Stefan Metzmacher [this message]
2021-03-08 16:18 ` Zebediah Figura
2021-03-08 17:33 ` David Laight
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