* Shared memory
@ 2020-02-27 20:35 Ken Brown
2020-02-28 11:41 ` Corinna Vinschen
0 siblings, 1 reply; 2+ messages in thread
From: Ken Brown @ 2020-02-27 20:35 UTC (permalink / raw)
To: cygwin-devel
Hi Corinna,
I think I see how to enable FIFOs to be opened for reading multiple times, by
using shared memory to maintain data needed by all readers.
To this end I'm trying to imitate some of what you did in
fhandler_socket_unix.cc, and I find I'm confused about the use of reopen_shmem.
When this is called by fhandler_socket_unix::dup, shouldn't the call actually be
fhs->reopen_shmem () ?
It's the new fhandler that needs to open the shared memory, isn't it? Or am I
misunderstanding something?
Thanks.
Ken
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Shared memory
2020-02-27 20:35 Shared memory Ken Brown
@ 2020-02-28 11:41 ` Corinna Vinschen
0 siblings, 0 replies; 2+ messages in thread
From: Corinna Vinschen @ 2020-02-28 11:41 UTC (permalink / raw)
To: cygwin-developers
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On Feb 27 15:35, Ken Brown wrote:
> Hi Corinna,
>
> I think I see how to enable FIFOs to be opened for reading multiple times,
> by using shared memory to maintain data needed by all readers.
>
> To this end I'm trying to imitate some of what you did in
> fhandler_socket_unix.cc, and I find I'm confused about the use of
> reopen_shmem. When this is called by fhandler_socket_unix::dup, shouldn't
> the call actually be
>
> fhs->reopen_shmem () ?
>
> It's the new fhandler that needs to open the shared memory, isn't it? Or am
> I misunderstanding something?
You're right. And then it's also called too early.
It should only be called after fhs->shmem_handle is valid.
I applied a patch.
Thanks,
Corinna
--
Corinna Vinschen
Cygwin Maintainer
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