[PATCH libdrm] add libsync.h helper

[Rob Clark]

On Mon, Oct 31, 2016 at 11:25 AM, Emil Velikov <emil.l.velikov at gmail.com> wrote:
> On 31 October 2016 at 13:44, Rob Clark <robdclark at gmail.com> wrote:
>> From: Rob Clark <robclark at freedesktop.org>
>>
>> Rather than cut/pasting these couple ioctl wrappers everywhere, just
>> stuff them as static-inline into a header.
>>
>> Signed-off-by: Rob Clark <robclark at freedesktop.org>
>> ---
>> This is probably mostly used from mesa, but some drivers, test apps, etc
>> may also want to use it from libdrm.
>>
> It makes sense imho. To avoid fun experiences we want the header
> synced in an identical manner (make headers_install) to the
> include/drm ones. One might as well move it there, so make its "more"
> obvious.
>

hmm, not sure I understand, but '#include <libsync.h>' seems to work
in either case..

>
>> +static inline int sync_wait(int fd, int timeout)
>> +{
>> +       struct pollfd fds;
>> +
>> +       fds.fd = fd;
>> +       fds.events = POLLIN | POLLERR;
> IIRC the API does not mention (forbid even) additional members of the
> pollfd struct.
> Let's zero init fds, and the compiler will drop it if/where applicable ?


hmm, and I guess if this gets #include'd from c++ code, does it get
more fun?  I thought there were some different rules about struct
initializers in c++?  Or maybe that was just with certain compilers?

BR,
-R