From 031e5cce385d3f96b1caa1d53495332a7eb03749 Mon Sep 17 00:00:00 2001
From: Steve McIntyre <steve@einval.com>
Date: Tue, 23 Mar 2021 23:49:46 +0000
Subject: New upstream version 15.3

---
 gnu-efi/lib/lock.c | 107 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 107 insertions(+)
 create mode 100644 gnu-efi/lib/lock.c

(limited to 'gnu-efi/lib/lock.c')

diff --git a/gnu-efi/lib/lock.c b/gnu-efi/lib/lock.c
new file mode 100644
index 00000000..a33bec34
--- /dev/null
+++ b/gnu-efi/lib/lock.c
@@ -0,0 +1,107 @@
+/*++
+
+Copyright (c) 1998  Intel Corporation
+
+Module Name:
+
+    lock.c
+
+Abstract:
+
+    Implements FLOCK
+
+
+
+Revision History
+
+--*/
+
+
+#include "lib.h"
+
+
+VOID
+InitializeLock (
+    IN OUT FLOCK    *Lock,
+    IN EFI_TPL      Priority
+    )
+/*++
+
+Routine Description:
+
+    Initialize a basic mutual exclusion lock.   Each lock
+    provides mutual exclusion access at it's task priority
+    level.  Since there is no-premption (at any TPL) or
+    multiprocessor support, acquiring the lock only consists
+    of raising to the locks TPL.
+
+    Note on a debug build the lock is acquired and released
+    to help ensure proper usage.
+    
+Arguments:
+
+    Lock        - The FLOCK structure to initialize
+
+    Priority    - The task priority level of the lock
+
+    
+Returns:
+
+    An initialized F Lock structure.
+
+--*/
+{
+    Lock->Tpl = Priority;
+    Lock->OwnerTpl = 0;
+    Lock->Lock = 0;
+}
+
+
+VOID
+AcquireLock (
+    IN FLOCK    *Lock
+    )
+/*++
+
+Routine Description:
+
+    Raising to the task priority level of the mutual exclusion
+    lock, and then acquires ownership of the lock.
+    
+Arguments:
+
+    Lock        - The lock to acquire
+    
+Returns:
+
+    Lock owned
+
+--*/
+{
+    RtAcquireLock (Lock);
+}
+
+
+VOID
+ReleaseLock (
+    IN FLOCK    *Lock
+    )
+/*++
+
+Routine Description:
+
+    Releases ownership of the mutual exclusion lock, and
+    restores the previous task priority level.
+    
+Arguments:
+
+    Lock        - The lock to release
+    
+Returns:
+
+    Lock unowned
+
+--*/
+{
+    RtReleaseLock (Lock);
+}
-- 
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