From: i.nixman@autistici.org
To: Jonathan Wakely <jwakely@redhat.com>
Cc: LIU Hao <lh_mouse@126.com>,
libstdc++@gcc.gnu.org, gcc-patches@gcc.gnu.org,
Eric Botcazou <ebotcazou@adacore.com>
Subject: Re: Adding a new thread model to GCC
Date: Fri, 21 Oct 2022 10:09:55 +0000 [thread overview]
Message-ID: <7277b1d9a835d8cc651ab112eac8c2e7@autistici.org> (raw)
In-Reply-To: <CACb0b4=4K5b046-hTCgMa9NE8h9Kqp3j8JwTBwww4D=PWQZmHQ@mail.gmail.com>
On 2022-10-21 09:58, Jonathan Wakely via Libstdc++ wrote:
> How does this compare with Eric B's proposal at
> https://gcc.gnu.org/legacy-ml/gcc-patches/2019-06/msg01840.html ?
>
> It would be good if we can accept one of them for GCC 13, but I don't
> know Windows well enough to determine which is better.
I had the same question...
I would like to understand what is the difference?
Moreover I would like to understand what is the difference with the
already added support for the winpthreads library?
@LIU Hao, could you explain please?
best!
> On Sat, 1 Oct 2022 at 19:35, LIU Hao via Libstdc++
> <libstdc++@gcc.gnu.org> wrote:
>>
>> Greetings.
>>
>> After some years I think it's time to put on this topic again.
>>
>> This patch series is an attempt to add a new thread model basing on
>> the mcfgthread library
>> (https://github.com/lhmouse/mcfgthread), which provides efficient
>> implementations of mutexes,
>> condition variables, once flags, etc. for native Windows.
>>
>>
>> The first patch is necessary because somewhere in libgfortran,
>> `pthread_t` is referenced. If the
>> thread model is not `posix`, it fails to compile.
>>
>> The second patch implements `std::thread::hardware_concurrency()` for
>> non-posix thread models. This
>> would also work for the win32 thread model if `std::thread` would be
>> supported in the future.
>>
>> The third patch adds the `mcf` thread model for GCC and its libraries.
>> A new builtin macro
>> `__USING_MCFGTHREAD__` is added to indicate whether this new thread
>> model is in effect. This grants
>> `std::mutex` and `std::once_flag` trivial destructors;
>> `std::condition_variable` is a bit
>> unfortunate because its destructor is non-trivial, but in reality no
>> cleanup is performed.
>>
>>
>> I have been bootstrapping GCC with the MCF thread model for more than
>> five years. At the moment, C,
>> C++ and Fortran are supported. Ada is untested because I don't know
>> how to bootstrap it. Objective-C
>> is not supported, because threading APIs for libobjc have not been
>> implemented.
>>
>> Please review. If there are any changes that I have to make, let me
>> know.
>>
>>
>> --
>> Best regards,
>> LIU Hao
next prev parent reply other threads:[~2022-10-21 10:09 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-01 18:34 LIU Hao
2022-10-01 20:02 ` Bernhard Reutner-Fischer
2022-10-21 9:58 ` Jonathan Wakely
2022-10-21 10:09 ` i.nixman [this message]
2022-10-21 10:48 ` Jonathan Wakely
2022-10-21 10:55 ` i.nixman
2022-10-21 11:36 ` LIU Hao
2022-10-21 11:54 ` i.nixman
2022-10-21 12:19 ` LIU Hao
2022-10-21 12:34 ` i.nixman
2022-10-24 3:40 ` LIU Hao
2022-10-24 20:50 ` Jacek Caban
2022-10-21 11:44 ` Eric Botcazou
2022-10-21 11:55 ` i.nixman
2022-10-24 6:53 ` i.nixman
2022-10-24 8:15 ` Eric Botcazou
2022-10-24 8:20 ` i.nixman
2022-10-31 9:18 ` Eric Botcazou
2022-10-31 15:22 ` i.nixman
2022-11-01 5:22 ` i.nixman
2022-11-01 9:09 ` Eric Botcazou
2022-11-02 12:05 ` i.nixman
2022-11-02 21:27 ` Eric Botcazou
2022-11-02 21:40 ` i.nixman
2022-12-16 17:18 ` Jonathan Wakely
2022-12-16 19:20 ` Eric Botcazou
2022-12-22 12:21 ` Jonathan Yong
2022-12-22 12:28 ` i.nixman
2022-12-23 23:59 ` Jonathan Yong
2022-12-24 5:58 ` NightStrike
2022-12-24 6:27 ` i.nixman
2022-12-24 13:50 ` i.nixman
2022-12-24 15:42 ` i.nixman
2022-12-24 15:57 ` i.nixman
2022-12-24 21:22 ` i.nixman
2022-12-25 1:10 ` Jonathan Yong
2023-01-09 21:56 ` Eric Botcazou
2022-12-24 6:22 ` i.nixman
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