Sync/gnu-efi/lib/runtime/rtlock.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

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);
}
}
}