9d510e61fc
https://bugzilla.tianocore.org/show_bug.cgi?id=1373 Replace BSD 2-Clause License with BSD+Patent License. This change is based on the following emails: https://lists.01.org/pipermail/edk2-devel/2019-February/036260.html https://lists.01.org/pipermail/edk2-devel/2018-October/030385.html RFCs with detailed process for the license change: V3: https://lists.01.org/pipermail/edk2-devel/2019-March/038116.html V2: https://lists.01.org/pipermail/edk2-devel/2019-March/037669.html V1: https://lists.01.org/pipermail/edk2-devel/2019-March/037500.html Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com> Reviewed-by: Hao Wu <hao.a.wu@intel.com> Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
101 lines
1.9 KiB
C
101 lines
1.9 KiB
C
/** @file
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DXE Core library services.
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Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include "DxeMain.h"
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//
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// Lock Stuff
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//
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/**
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Initialize a basic mutual exclusion lock. Each lock
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provides mutual exclusion access at it's task priority
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level. Since there is no-premption (at any TPL) or
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multiprocessor support, acquiring the lock only consists
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of raising to the locks TPL.
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@param Lock The EFI_LOCK structure to initialize
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@retval EFI_SUCCESS Lock Owned.
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@retval EFI_ACCESS_DENIED Reentrant Lock Acquisition, Lock not Owned.
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**/
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EFI_STATUS
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CoreAcquireLockOrFail (
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IN EFI_LOCK *Lock
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)
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{
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ASSERT (Lock != NULL);
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ASSERT (Lock->Lock != EfiLockUninitialized);
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if (Lock->Lock == EfiLockAcquired) {
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//
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// Lock is already owned, so bail out
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//
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return EFI_ACCESS_DENIED;
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}
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Lock->OwnerTpl = CoreRaiseTpl (Lock->Tpl);
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Lock->Lock = EfiLockAcquired;
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return EFI_SUCCESS;
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}
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/**
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Raising to the task priority level of the mutual exclusion
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lock, and then acquires ownership of the lock.
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@param Lock The lock to acquire
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@return Lock owned
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**/
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VOID
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CoreAcquireLock (
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IN EFI_LOCK *Lock
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)
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{
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ASSERT (Lock != NULL);
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ASSERT (Lock->Lock == EfiLockReleased);
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Lock->OwnerTpl = CoreRaiseTpl (Lock->Tpl);
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Lock->Lock = EfiLockAcquired;
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}
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/**
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Releases ownership of the mutual exclusion lock, and
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restores the previous task priority level.
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@param Lock The lock to release
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@return Lock unowned
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**/
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VOID
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CoreReleaseLock (
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IN EFI_LOCK *Lock
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)
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{
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EFI_TPL Tpl;
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ASSERT (Lock != NULL);
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ASSERT (Lock->Lock == EfiLockAcquired);
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Tpl = Lock->OwnerTpl;
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Lock->Lock = EfiLockReleased;
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CoreRestoreTpl (Tpl);
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}
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