Date: Tue, 28 May 2013 00:56:54 -0400 From: Zaphod Beeblebrox <zbeeble@gmail.com> To: Luigi Rizzo <rizzo@iet.unipi.it> Cc: FreeBSD Current <current@freebsd.org> Subject: Re: copyin+copyout in one step ? Message-ID: <CACpH0Mf57zA0LqEykuYdj1KQyqA%2BqUyTYrxJCsiWdLYPRBU-PA@mail.gmail.com> In-Reply-To: <20130527233801.GA32042@onelab2.iet.unipi.it> References: <20130527233801.GA32042@onelab2.iet.unipi.it>
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On Mon, May 27, 2013 at 7:38 PM, Luigi Rizzo <rizzo@iet.unipi.it> wrote: > > say a process P1 wants to use the kernel to copy the content of a > buffer SRC (in its user address space) to a buffer DST (in the > address space of another process P2), and assume that P1 issues the > request to the kernel when P2 has already told the kernel where the > data should go: > Urm... Isn't the use of shared memory the more obvious way to transfer data between processes? Am I missing some nuance?
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