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/*++
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);
}
|
