On 05/31/2017 04:43 AM, Paolo Bonzini wrote:
> These functions are more efficient in the presence of contention.
> qemu_co_rwlock_downgrade also guarantees not to block, which may
> be useful in some algorithms too.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
>  include/qemu/coroutine.h   | 19 +++++++++++++++++++
>  util/qemu-coroutine-lock.c | 35 +++++++++++++++++++++++++++++++++++
>  2 files changed, 54 insertions(+)
> 

Reviewed-by: Eric Blake <eblake@redhat.com>

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org