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[Xen-changelog] [xen master] xen: Document that EVTCHNOP_bind_interdomain signals

commit 340702fd894add8adcdfd6c5742f41f89aa1fed2
Author:     Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
AuthorDate: Tue Dec 17 18:35:16 2013 +0000
Commit:     Ian Campbell <ian.campbell@xxxxxxxxxx>
CommitDate: Tue Jan 7 13:31:20 2014 +0000

    xen: Document that EVTCHNOP_bind_interdomain signals
    EVTCHNOP_bind_interdomain signals the event channel.  Document this.
    Also explain the usual use pattern.
    Signed-off-by: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
    Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
    CC: Keir Fraser <keir@xxxxxxx>
    CC: Jan Beulich <JBeulich@xxxxxxxx>
 xen/include/public/event_channel.h |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/xen/include/public/event_channel.h 
index b78ee32..49ac8cc 100644
--- a/xen/include/public/event_channel.h
+++ b/xen/include/public/event_channel.h
@@ -101,6 +101,17 @@ typedef struct evtchn_alloc_unbound evtchn_alloc_unbound_t;
  * a port that is unbound and marked as accepting bindings from the calling
  * domain. A fresh port is allocated in the calling domain and returned as
  * <local_port>.
+ *
+ * In case the peer domain has already tried to set our event channel
+ * pending, before it was bound, EVTCHNOP_bind_interdomain always sets
+ * the local event channel pending.
+ *
+ * The usual pattern of use, in the guest's upcall (or subsequent
+ * handler) is as follows: (Re-enable the event channel for subsequent
+ * signalling and then) check for the existence of whatever condition
+ * is being waited for by other means, and take whatever action is
+ * needed (if any).
+ *
  * NOTES:
  *  1. <remote_dom> may be DOMID_SELF, allowing loopback connections.
generated by git-patchbot for /home/xen/git/xen.git#master

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