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374752a26b
Xenstore watch call-backs are already abstracted away from XenBus using
the XenWatch data structure but the associated NotifierList manipulation
and file handle registration is still open coded in various xen_bus_...()
functions.
This patch creates a new XenWatchList data structure to allow these
interactions to be abstracted away from XenBus as well. This is in
preparation for a subsequent patch which will introduce separate watch lists
for XenBus and XenDevice objects.
NOTE: This patch also introduces a new notifier_list_empty() helper function
for the purposes of adding an assertion that a XenWatchList is not
freed whilst its associated NotifierList is still occupied.
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Reviewed-by: Anthony Perard <anthony.perard@citrix.com>
Message-Id: <20190913082159.31338-2-paul.durrant@citrix.com>
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
/*
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* Notifier lists
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*
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* Copyright IBM, Corp. 2010
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#ifndef QEMU_NOTIFY_H
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#define QEMU_NOTIFY_H
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#include "qemu/queue.h"
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typedef struct Notifier Notifier;
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struct Notifier
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{
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void (*notify)(Notifier *notifier, void *data);
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QLIST_ENTRY(Notifier) node;
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};
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typedef struct NotifierList
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{
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QLIST_HEAD(, Notifier) notifiers;
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} NotifierList;
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#define NOTIFIER_LIST_INITIALIZER(head) \
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{ QLIST_HEAD_INITIALIZER((head).notifiers) }
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void notifier_list_init(NotifierList *list);
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void notifier_list_add(NotifierList *list, Notifier *notifier);
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void notifier_remove(Notifier *notifier);
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void notifier_list_notify(NotifierList *list, void *data);
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bool notifier_list_empty(NotifierList *list);
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/* Same as Notifier but allows .notify() to return errors */
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typedef struct NotifierWithReturn NotifierWithReturn;
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struct NotifierWithReturn {
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/**
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* Return 0 on success (next notifier will be invoked), otherwise
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* notifier_with_return_list_notify() will stop and return the value.
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*/
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int (*notify)(NotifierWithReturn *notifier, void *data);
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QLIST_ENTRY(NotifierWithReturn) node;
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};
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typedef struct NotifierWithReturnList {
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QLIST_HEAD(, NotifierWithReturn) notifiers;
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} NotifierWithReturnList;
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#define NOTIFIER_WITH_RETURN_LIST_INITIALIZER(head) \
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{ QLIST_HEAD_INITIALIZER((head).notifiers) }
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void notifier_with_return_list_init(NotifierWithReturnList *list);
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void notifier_with_return_list_add(NotifierWithReturnList *list,
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NotifierWithReturn *notifier);
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void notifier_with_return_remove(NotifierWithReturn *notifier);
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int notifier_with_return_list_notify(NotifierWithReturnList *list,
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void *data);
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#endif
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