Sync/gnu-efi/lib/lock.c
Curle d588e232c4 Major overhaul of this branch.
This branch has been dedicated to purely the UEFI bootloader.
As such, all other code has been removed.

This code can be compiled with Visual Studio, gcc or llvm.
2019-07-17 21:10:29 +01:00

108 lines
1.5 KiB
C

/*++
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);
}