99 lines
1.4 KiB
C
99 lines
1.4 KiB
C
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/*++
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Copyright (c) 1998 Intel Corporation
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Module Name:
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lock.c
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Abstract:
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Implements FLOCK
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Revision History
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--*/
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#include "lib.h"
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#pragma RUNTIME_CODE(RtAcquireLock)
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VOID
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RtAcquireLock (
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IN FLOCK *Lock
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)
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/*++
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Routine Description:
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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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Arguments:
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Lock - The lock to acquire
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Returns:
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Lock owned
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--*/
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{
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if (BS) {
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if (BS->RaiseTPL != NULL) {
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Lock->OwnerTpl = BS->RaiseTPL(Lock->Tpl);
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}
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}
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else {
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if (LibRuntimeRaiseTPL != NULL) {
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Lock->OwnerTpl = LibRuntimeRaiseTPL(Lock->Tpl);
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}
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}
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Lock->Lock += 1;
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ASSERT (Lock->Lock == 1);
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}
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#pragma RUNTIME_CODE(RtAcquireLock)
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VOID
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RtReleaseLock (
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IN FLOCK *Lock
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)
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/*++
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Routine Description:
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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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Arguments:
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Lock - The lock to release
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Returns:
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Lock unowned
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--*/
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{
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EFI_TPL Tpl;
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Tpl = Lock->OwnerTpl;
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ASSERT(Lock->Lock == 1);
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Lock->Lock -= 1;
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if (BS) {
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if (BS->RestoreTPL != NULL) {
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BS->RestoreTPL (Tpl);
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}
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}
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else {
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if (LibRuntimeRestoreTPL != NULL) {
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LibRuntimeRestoreTPL(Tpl);
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}
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}
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}
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