[Mesa-dev] Plumbing explicit synchronization through the Linux ecosystem

[Jacob Lifshay]

One related issue with explicit sync using sync_file is that combined
CPUs/GPUs (the CPU cores *are* the GPU cores) that do all the
rendering in userspace (like llvmpipe but for Vulkan and with extra
instructions for GPU tasks) but need to synchronize with other
drivers/processes is that there should be some way to create an
explicit fence/semaphore from userspace and later signal it. This
seems to conflict with the requirement for a sync_file to complete in
finite time, since the user process could be stopped or killed.

Any ideas?

Jacob Lifshay