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/*++
Copyright (c) 1998 Intel Corporation
Module Name:
lock.c
Abstract:
Implements FLOCK
Revision History
--*/
#include "lib.h"
#pragma RUNTIME_CODE(RtAcquireLock)
VOID
RtAcquireLock (
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
--*/
{
if (BS) {
if (BS->RaiseTPL != NULL) {
Lock->OwnerTpl = BS->RaiseTPL(Lock->Tpl);
}
}
else {
if (LibRuntimeRaiseTPL != NULL) {
Lock->OwnerTpl = LibRuntimeRaiseTPL(Lock->Tpl);
}
}
Lock->Lock += 1;
ASSERT (Lock->Lock == 1);
}
#pragma RUNTIME_CODE(RtAcquireLock)
VOID
RtReleaseLock (
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
--*/
{
EFI_TPL Tpl;
Tpl = Lock->OwnerTpl;
ASSERT(Lock->Lock == 1);
Lock->Lock -= 1;
if (BS) {
if (BS->RestoreTPL != NULL) {
BS->RestoreTPL (Tpl);
}
}
else {
if (LibRuntimeRestoreTPL != NULL) {
LibRuntimeRestoreTPL(Tpl);
}
}
}
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