* Sasha Levin <[email protected]> wrote:
> +++ b/tools/kvm/include/kvm/brlock.h
> @@ -0,0 +1,12 @@
> +#ifndef KVM__BRLOCK_H
> +#define KVM__BRLOCK_H
> +
> +#include "kvm/kvm.h"
> +#include "kvm/barrier.h"
> +
> +#define br_read_lock() mb()
> +#define br_read_unlock() mb()
These only need to be compiler barrier()s AFAICS, because the 'pause'
op will signal back to the requestor thread - which whole operation
is a barrier to begin with.
> +#define br_write_lock() kvm__pause()
> +#define br_write_unlock() kvm__continue()
> +#endif
Btw., it might make sense to add a comment to this header file,
explaining what a 'big reader lock' is :-)
Thanks,
Ingo
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