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[Xen-devel] How to mask an event channel?

 In <Xen In seterface Manual>, chapter 5 Event Channels, they say that:"Event Notifications can be masked by setting a flag; this is equivalent to disabling interrupts and can be used to ensure atomicity of certain operation in the guest kernel".

My question is :
I know that we can use 'xc_evtchn_unmask(xcehandle, port)' to unmask an event channel , but I can not find the function used to mask an event channel.
Can any body solve the problem?
Thanks a lot.
                                                                            Danius Wu

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