Re: [boost] [thread] Request review of new synchronisation object, boost::permit<>

Subject: Re: [boost] [thread] Request review of new synchronisation object, boost::permit<>
From: Niall Douglas (s_sourceforge_at_[hidden])
Date: 2014-05-05 09:59:28

On 5 May 2014 at 11:03, microcai wrote:

> >> > A non-consuming permit looks quite like a Win32 event object yes, except
> >> > it has stronger guarantees useful for many-waiter many-signaller
> >> > situations.
> 
> asio::windows::object_handle permit(io_service, CreateEvent(0,1,00));
> 
> permit.wait();
> 
> permit.async_wait(  []{   do some thing here}  ) ;

Equivalent with permits:

boost::permit_nc permit;
int fds[2];
pipe(fds);
pthread_permitnc_associate_fd(permit.native_handle(), fds);
asio::posix::stream_descriptor input(ioservice, fd[0]), 
output(ioservice, fd[1]);
input.async_wait([] { do something here } );

I haven't checked this code, but something close should work. The 
point is you can associate the state of a fd with a non-consuming 
permit.

Niall

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