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Re: [std-proposals] Helper class to make safe a thread-unsafe class

From: Frederick Virchanza Gotham <cauldwell.thomas_at_[hidden]>
Date: Thu, 29 Jun 2023 00:13:06 +0100
On Thu, Jun 29, 2023 at 12:05 AM Ville Voutilainen via Std-Proposals
<std-proposals_at_[hidden]> wrote:
> > Indeed. This is boost::synchronized_value<T>.
> There's also a synchronized_value in
> https://open-std.org/JTC1/SC22/WG21/docs/papers/2023/n4953.pdf
> I thought Jonathan mentioned that earlier?

It turns out that the GNU compiler g++ version 13 already has this
under std::experimental.

Looking through the implementation of boost:synchronized_value, it
looks like it uses a regular mutex. My own implementation of my own
class uses a recursive mutex so that you can do stuff like:

void Func2(void)

void Func(void)
    auto mylock = g_obj.Reserve();
    Func2(); // This would cause thread-lock if the mutex weren't a

I think a recursive_mutex is better here.

Received on 2023-06-28 23:13:17