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Re: [gpsd-users] gpsd and shared memory
From: |
Gary E. Miller |
Subject: |
Re: [gpsd-users] gpsd and shared memory |
Date: |
Mon, 5 Oct 2015 23:56:46 -0700 |
Yo Roger!
On Tue, 6 Oct 2015 05:50:36 +0000
Roger Oberholtzer <address@hidden> wrote:
> Hmm.. Learned something new today.
Good. It is a difficult subject.
> So, to reiterate a few of my questions:
>
> 1. If the shared memory segment changes during the read, does the
> read return that there was nothing to read?
The SHMMEM RAM is always there. So there is always something to read.
When the bookends change there is new data.
> 2. If the data is the same as before, does the read return it again?
The CPU can always read the SHMMEM RAM, so you alays have something to
read.
> How did I score?
The proof will be in your code.
RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
address@hidden Tel:+1 541 382 8588
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- [gpsd-users] gpsd and shared memory, Roger Oberholtzer, 2015/10/08
- Re: [gpsd-users] gpsd and shared memory, Gary E. Miller, 2015/10/08
- Re: [gpsd-users] gpsd and shared memory, Roger Oberholtzer, 2015/10/08
- Re: [gpsd-users] gpsd and shared memory, Roger Oberholtzer, 2015/10/08
- Re: [gpsd-users] gpsd and shared memory, Gary E. Miller, 2015/10/08
- Re: [gpsd-users] gpsd and shared memory, Roger Oberholtzer, 2015/10/08
- Re: [gpsd-users] gpsd and shared memory, Ed Simmons, 2015/10/08
- Re: [gpsd-users] gpsd and shared memory, Gary E. Miller, 2015/10/08
- Re: [gpsd-users] gpsd and shared memory, Roger Oberholtzer, 2015/10/08
- Re: [gpsd-users] gpsd and shared memory,
Gary E. Miller <=
- Message not available
- Message not available
- Message not available
- Re: [gpsd-users] gpsd and shared memory, Roger Oberholtzer, 2015/10/08
- Re: [gpsd-users] gpsd and shared memory, Gary E. Miller, 2015/10/08
Re: [gpsd-users] gpsd and shared memory, Jon Schlueter, 2015/10/08