/**
Check the status of an event.
@param UserEvent The event to check
@retval EFI_SUCCESS The event is in the signaled state
@retval EFI_NOT_READY The event is not in the signaled state
@retval EFI_INVALID_PARAMETER Event is of type EVT_NOTIFY_SIGNAL
**/
EFI_STATUS
EFIAPI
CoreCheckEvent (
IN EFI_EVENT UserEvent
)
{
IEVENT *Event;
EFI_STATUS Status;
Event = UserEvent;
if (Event == NULL) {
return EFI_INVALID_PARAMETER;
}
if (Event->Signature != EVENT_SIGNATURE) {
return EFI_INVALID_PARAMETER;
}
if ((Event->Type & EVT_NOTIFY_SIGNAL) != 0) {
return EFI_INVALID_PARAMETER;
}
Status = EFI_NOT_READY;
if ((Event->SignalCount == 0) && ((Event->Type & EVT_NOTIFY_WAIT) != 0)) {
//
// Queue the wait notify function
//
CoreAcquireEventLock ();
if (Event->SignalCount == 0) {
CoreNotifyEvent (Event);
}
CoreReleaseEventLock ();
}
//
// If the even looks signalled, get the lock and clear it
//
if (Event->SignalCount != 0) {
CoreAcquireEventLock ();
if (Event->SignalCount != 0) {
Event->SignalCount = 0;
Status = EFI_SUCCESS;
}
CoreReleaseEventLock ();
}
return Status;
}
/**
Signals the event. Queues the event to be notified if needed.
@param UserEvent The event to signal .
@retval EFI_INVALID_PARAMETER Parameters are not valid.
@retval EFI_SUCCESS The event was signaled.
**/
EFI_STATUS
EFIAPI
CoreSignalEvent (
IN EFI_EVENT UserEvent
)
{
IEVENT *Event;
Event = UserEvent;
if (Event == NULL) {
return EFI_INVALID_PARAMETER;
}
if (Event->Signature != EVENT_SIGNATURE) {
return EFI_INVALID_PARAMETER;
}
CoreAcquireEventLock ();
//
// If the event is not already signalled, do so
//
if (Event->SignalCount == 0x00000000) {
Event->SignalCount++;
//
// If signalling type is a notify function, queue it
//
if ((Event->Type & EVT_NOTIFY_SIGNAL) != 0) {
if (Event->ExFlag) {
//
// The CreateEventEx() style requires all members of the Event Group
// to be signaled.
//
CoreReleaseEventLock ();
CoreNotifySignalList (&Event->EventGroup);
CoreAcquireEventLock ();
} else {
CoreNotifyEvent (Event);
}
}
}
CoreReleaseEventLock ();
return EFI_SUCCESS;
}
/**
Signals all events in the EventGroup.
@param EventGroup The list to signal
**/
VOID
CoreNotifySignalList (
IN EFI_GUID *EventGroup
)
{
LIST_ENTRY *Link;
LIST_ENTRY *Head;
IEVENT *Event;
CoreAcquireEventLock ();
Head = &gEventSignalQueue;
for (Link = Head->ForwardLink; Link != Head; Link = Link->ForwardLink) {
Event = CR (Link, IEVENT, SignalLink, EVENT_SIGNATURE);
if (CompareGuid (&Event->EventGroup, EventGroup)) {
CoreNotifyEvent (Event);
}
}
CoreReleaseEventLock ();
}
VOID
CoreNotifySignalList (
IN EFI_GUID *EventGroup
)
/*++
Routine Description:
Signals all events on the requested list
Arguments:
SignalType - The list to signal
Returns:
None
--*/
{
EFI_LIST_ENTRY *Link;
EFI_LIST_ENTRY *Head;
IEVENT *Event;
CoreAcquireEventLock ();
Head = &gEventSignalQueue;
for (Link = Head->ForwardLink; Link != Head; Link = Link->ForwardLink) {
Event = CR (Link, IEVENT, SignalLink, EVENT_SIGNATURE);
if ((Event->ExFlag) && EfiCompareGuid (&Event->EventGroup, EventGroup)) {
CoreNotifyEvent (Event);
}
}
CoreReleaseEventLock ();
}
EFI_BOOTSERVICE
EFI_STATUS
EFIAPI
CoreCheckEvent (
IN EFI_EVENT UserEvent
)
/*++
Routine Description:
Check the status of an event
Arguments:
UserEvent - The event to check
Returns:
EFI_SUCCESS - The event is in the signaled state
EFI_NOT_READY - The event is not in the signaled state
EFI_INVALID_PARAMETER - Event is of type EVT_NOTIFY_SIGNAL
--*/
{
IEVENT *Event;
EFI_STATUS Status;
Event = UserEvent;
if (Event == NULL) {
return EFI_INVALID_PARAMETER;
}
if (Event->Signature != EVENT_SIGNATURE) {
return EFI_INVALID_PARAMETER;
}
if (Event->Type & EFI_EVENT_NOTIFY_SIGNAL) {
return EFI_INVALID_PARAMETER;
}
Status = EFI_NOT_READY;
if (!Event->SignalCount && (Event->Type & EFI_EVENT_NOTIFY_WAIT)) {
//
// Queue the wait notify function
//
CoreAcquireEventLock ();
if (!Event->SignalCount) {
CoreNotifyEvent (Event);
}
CoreReleaseEventLock ();
}
//
// If the even looks signalled, get the lock and clear it
//
if (Event->SignalCount) {
CoreAcquireEventLock ();
if (Event->SignalCount) {
Event->SignalCount = 0;
Status = EFI_SUCCESS;
}
CoreReleaseEventLock ();
}
return Status;
}
EFI_BOOTSERVICE
EFI_STATUS
EFIAPI
CoreSignalEvent (
IN EFI_EVENT UserEvent
)
/*++
Routine Description:
Signals the event. Queues the event to be notified if needed
Arguments:
UserEvent - The event to signal
Returns:
EFI_INVALID_PARAMETER - Parameters are not valid.
EFI_SUCCESS - The event was signaled.
--*/
{
IEVENT *Event;
Event = UserEvent;
if (Event == NULL) {
return EFI_INVALID_PARAMETER;
}
if (Event->Signature != EVENT_SIGNATURE) {
return EFI_INVALID_PARAMETER;
}
CoreAcquireEventLock ();
//
// If the event is not already signalled, do so
//
if (Event->SignalCount == 0x00000000) {
Event->SignalCount ++;
//
// If signalling type is a notify function, queue it
//
if (Event->Type & EFI_EVENT_NOTIFY_SIGNAL) {
if (Event->ExFlag) {
//
// The CreateEventEx() style requires all members of the Event Group
// to be signaled.
//
CoreReleaseEventLock ();
CoreNotifySignalList (&Event->EventGroup);
CoreAcquireEventLock ();
} else {
CoreNotifyEvent (Event);
}
}
}
CoreReleaseEventLock ();
return EFI_SUCCESS;
}
