Sync/efi/lib/runtime/rtlock.c
Curle 4300dc655c Add EFI documentation, libraries and includes.
The lib/inc folders are from the GNU-EFI project.
The documentation is from the uefi.org site.

Yes, I know there are duplicate includes. I have a plan for them.
2019-07-17 15:11:52 +01:00

103 lines
1.5 KiB
C

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