98 lines
2.2 KiB
C++
98 lines
2.2 KiB
C++
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/*++
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Copyright (c) 2000 Microsoft Corporation
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Module Name :
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kLocks.cpp
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Abstract:
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A collection of kernel-mode locks for multithreaded access
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to data structures
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Author:
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George V. Reilly (GeorgeRe) 25-Oct-2000
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Environment:
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Win32 - Kernel Mode
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Project:
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Internet Information Server Http.sys
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Revision History:
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--*/
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#include "precomp.hxx"
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#define DLL_IMPLEMENTATION
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#define IMPLEMENTATION_EXPORT
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#include <kLKRhash.h>
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#include "../src/Locks.cpp"
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//------------------------------------------------------------------------
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// CKSpinLock static member variables
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LOCK_DEFAULT_SPIN_DATA(CKSpinLock);
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LOCK_STATISTICS_DATA(CKSpinLock);
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LOCK_STATISTICS_DUMMY_IMPLEMENTATION(CKSpinLock);
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//------------------------------------------------------------------------
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// CFastMutex static member variables
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LOCK_DEFAULT_SPIN_DATA(CFastMutex);
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LOCK_STATISTICS_DATA(CFastMutex);
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LOCK_STATISTICS_DUMMY_IMPLEMENTATION(CFastMutex);
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//------------------------------------------------------------------------
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// CEResource static member variables
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LOCK_DEFAULT_SPIN_DATA(CEResource);
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LOCK_STATISTICS_DATA(CEResource);
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LOCK_STATISTICS_DUMMY_IMPLEMENTATION(CEResource);
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//------------------------------------------------------------------------
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// Function: CEResource::ReadOrWriteLock
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// Synopsis: If already locked, recursively acquires another lock of the
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// same kind (read or write). Otherwise, just acquires a read lock.
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//------------------------------------------------------------------------
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bool
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CEResource::ReadOrWriteLock()
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{
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if (IsWriteLocked())
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{
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WriteLock();
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return false; // => not read locked
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}
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else
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{
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ReadLock();
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return true; // => is read locked
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}
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}
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//------------------------------------------------------------------------
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// Function: CEResource::ReadOrWriteUnlock
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// Synopsis: release a lock acquired with ReadOrWriteLock
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//------------------------------------------------------------------------
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void
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CEResource::ReadOrWriteUnlock(
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bool fIsReadLocked)
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{
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if (fIsReadLocked)
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ReadUnlock();
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else
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WriteUnlock();
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}
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