From 772fb7cb13de5e18f04e8a19b97d2949f9dc7054 Mon Sep 17 00:00:00 2001
From: Laszlo Ersek <lersek@redhat.com>
Date: Tue, 22 Mar 2016 17:07:14 +0100
Subject: MdePkg/UefiLib: introduce EfiEventGroupSignal

This is a small convenience function that eases signaling an event group
(identified by GUID). An example where it can be used is Platform BDS
signaling the End-of-DXE event group.

The naming follows EfiNamedEventSignal().

The patch modifies the library class header, and updates the most commonly
used library instance at once. Other library instances in the edk2 tree
will be adapted in the following patches.

Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Suggested-by: Jordan Justen <jordan.l.justen@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
---
 MdePkg/Include/Library/UefiLib.h | 18 +++++++++++++++++
 MdePkg/Library/UefiLib/UefiLib.c | 43 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 61 insertions(+)

diff --git a/MdePkg/Include/Library/UefiLib.h b/MdePkg/Include/Library/UefiLib.h
index 4ce8dc6c05..e8a6b8498e 100644
--- a/MdePkg/Include/Library/UefiLib.h
+++ b/MdePkg/Include/Library/UefiLib.h
@@ -223,6 +223,24 @@ EfiNamedEventSignal (
   IN CONST EFI_GUID  *Name
   );
 
+/**
+  Signals an event group by placing a new event in the group temporarily and
+  signaling it.
+
+  @param[in] EventGroup          Supplies the unique identifier of the event
+                                 group to signal.
+
+  @retval EFI_SUCCESS            The event group was signaled successfully.
+  @retval EFI_INVALID_PARAMETER  EventGroup is NULL.
+  @return                        Error codes that report problems about event
+                                 creation or signaling.
+**/
+EFI_STATUS
+EFIAPI
+EfiEventGroupSignal (
+  IN CONST EFI_GUID *EventGroup
+  );
+
 /** 
   Returns the current TPL.
 
diff --git a/MdePkg/Library/UefiLib/UefiLib.c b/MdePkg/Library/UefiLib/UefiLib.c
index ba3acc1af2..96d375fb6f 100644
--- a/MdePkg/Library/UefiLib/UefiLib.c
+++ b/MdePkg/Library/UefiLib/UefiLib.c
@@ -304,6 +304,49 @@ EfiNamedEventSignal (
   return Status;
 }
 
+/**
+  Signals an event group by placing a new event in the group temporarily and
+  signaling it.
+
+  @param[in] EventGroup          Supplies the unique identifier of the event
+                                 group to signal.
+
+  @retval EFI_SUCCESS            The event group was signaled successfully.
+  @retval EFI_INVALID_PARAMETER  EventGroup is NULL.
+  @return                        Error codes that report problems about event
+                                 creation or signaling.
+**/
+EFI_STATUS
+EFIAPI
+EfiEventGroupSignal (
+  IN CONST EFI_GUID *EventGroup
+  )
+{
+  EFI_STATUS Status;
+  EFI_EVENT  Event;
+
+  if (EventGroup == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  Status = gBS->CreateEventEx (
+                  EVT_NOTIFY_SIGNAL,
+                  TPL_CALLBACK,
+                  InternalEmptyFunction,
+                  NULL,
+                  EventGroup,
+                  &Event
+                  );
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  Status = gBS->SignalEvent (Event);
+  gBS->CloseEvent (Event);
+
+  return Status;
+}
+
 /** 
   Returns the current TPL.
 
-- 
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