Is iHD driver thread-safe?

[daijh]

A recent libva PR imposed the requirement that all backends must be thread-safe.
Does iHD driver implement comply with this libva thread-safe statement?

All VAAPI functions implemented in libva are thread-safe. For any VAAPI
function that requires the implementation of a backend (e.g. hardware driver),
the backend must ensure that its implementation is also thread-safe. If the
backend implementation of a VAAPI function is not thread-safe then this should
be considered as a bug against the backend implementation.

Update va.h for multi-threaded usages intel/libva#347

Thanks for the clarification.

[XinfengZhang]

yes, iHD implementation comply with the libva thread-safe statement.
it was tested by https://github.com/Intel-Media-SDK/samples/tree/master/samples/sample_multi_transcode.
if there are thread safe issue, please report ,it, maintainers will fix it.

please also pay attention on these statement of libva:

When multiple threads are operating on
the same VAAPI objects, it is the application's responsibility to synchronize
these operations in order to generate the expected results. For example, using
a single VAContext from multiple threads may generate unexpected results.