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468 lines
11 KiB
468 lines
11 KiB
/*++
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Copyright (c) 1989 Microsoft Corporation
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Module Name:
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lock.c
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Abstract:
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This module implements debugging function for locks.
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Author:
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Manny Weiser (mannyw) 17-Jan-1992
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This is essentially a copy of the LAN Manager server lock
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debugging
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Revision History:
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--*/
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#if MUPDBG
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#include "mup.h"
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#define HAS_TEB(_teb) ((BOOLEAN)(((ULONG)(_teb) <= MM_HIGHEST_USER_ADDRESS) ? FALSE : MmIsNonPagedSystemAddressValid(_teb)))
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#define MupCurrentTeb( ) ((PTEB)(KeGetCurrentThread( )->Teb))
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#define MupTebLockList( ) \
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((PLIST_ENTRY)&(MupCurrentTeb( )->UserReserved[MUP_TEB_LOCK_LIST]))
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#define MupThreadLockAddress( ) \
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( IsListEmpty( MupTebLockList( ) ) ? 0 : CONTAINING_RECORD( \
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MupTebLockList( )->Flink, \
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MUP_LOCK, \
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Header.ThreadListEntry \
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) )
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#define MupThreadLockLevel( ) \
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( IsListEmpty( MupTebLockList( ) ) ? 0 : CONTAINING_RECORD( \
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MupTebLockList( )->Flink, \
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MUP_LOCK, \
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Header.ThreadListEntry \
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)->Header.LockLevel )
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#define MupThreadLockName( ) \
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( IsListEmpty( MupTebLockList( ) ) ? "none" : CONTAINING_RECORD( \
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MupTebLockList( )->Flink, \
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MUP_LOCK, \
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Header.ThreadListEntry \
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)->Header.LockName )
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KSPIN_LOCK LockSpinLock = {0};
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BOOLEAN LockSpinLockInitialized = FALSE;
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#define MAX_LOCKS_HELD 15
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text( PAGE, MupInitializeLock )
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#pragma alloc_text( PAGE, MupDeleteLock )
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#pragma alloc_text( PAGE, MupReleaseLock )
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#pragma alloc_text( PAGE, MupCheckListIntegrity )
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#endif
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#if 0
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NOT PAGEABLE - MupAcquireLock
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#endif
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VOID
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MupInitializeLock(
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IN PMUP_LOCK Lock,
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IN ULONG LockLevel,
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IN PSZ LockName
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)
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/*++
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Routine Description:
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This routine initializes the input lock variable.
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Arguments:
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Lock - Supplies the lock variable being initialized
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LockLevel - Supplies the level of the lock
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LockName - Supplies the name of the lock
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Return Value:
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None.
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--*/
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{
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PAGED_CODE( );
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if ( !LockSpinLockInitialized ) {
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LockSpinLockInitialized = TRUE;
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KeInitializeSpinLock( &LockSpinLock );
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}
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//
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// Initialize the executive resource.
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//
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ExInitializeResourceLite( &Lock->Resource );
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//
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// Initialize the lock level. This is used to determine whether a
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// thread may acquire the lock. Save the lock name.
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//
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LOCK_LEVEL( Lock ) = LockLevel;
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LOCK_NAME( Lock ) = LockName;
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return;
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} // MupInitializeLock
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VOID
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MupDeleteLock (
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IN PMUP_LOCK Lock
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)
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/*++
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Routine Description:
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This routine deletes (i.e., uninitializes) a lock variable.
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Arguments:
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Lock - Supplies the lock variable being deleted
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Return Value:
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None.
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--*/
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{
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PAGED_CODE( );
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//
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// Make sure the lock is unowned.
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//
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if ( LOCK_NUMBER_OF_ACTIVE( Lock ) != 0 ) {
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DbgPrint( "MupDeleteLock: Thread %d\n", KeGetCurrentThread( ) );
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DbgPrint( "MupDeleteLock: Attempt to delete owned lock %s(%lx)",
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LOCK_NAME( Lock ),
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Lock
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);
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DbgBreakPoint();
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}
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//
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// Delete the resource.
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//
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ExDeleteResourceLite( &Lock->Resource );
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return;
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} // MupDeleteLock
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VOID
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MupAcquireLock(
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IN PMUP_LOCK Lock
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)
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/*++
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Routine Description:
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The routine acquires a lock.
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Arguments:
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Lock - Supplies the lock to acquire
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Return Value:
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BOOLEAN - Indicates whether the lock was acquired.
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--*/
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{
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PKTHREAD currentThread;
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PTEB currentTeb;
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BOOLEAN hasTeb;
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ULONG threadLockLevel;
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KIRQL oldIrql;
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currentThread = (PKTHREAD)ExGetCurrentResourceThread( );
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currentTeb = MupCurrentTeb( );
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hasTeb = HAS_TEB(currentTeb);
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//
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// If this thread does not have a nonpaged TEB, do not do lock-level
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// debugging. (We might be at DPC level, so we can't take page
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// faults.)
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//
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if ( hasTeb ) {
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//
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// Make sure that this thread has been initialized for lock
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// debugging. If not, initialize it.
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//
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KeAcquireSpinLock( &LockSpinLock, &oldIrql );
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if ( (ULONG)currentTeb->UserReserved[MUP_TEB_LOCK_INIT] !=
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0xbabababa ) {
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PLIST_ENTRY tebLockList = MupTebLockList( );
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InitializeListHead( tebLockList );
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currentTeb->UserReserved[MUP_TEB_LOCK_INIT] = (PVOID)0xbabababa;
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}
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KeReleaseSpinLock( &LockSpinLock, oldIrql );
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//
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// Make sure that the list of locks in the TEB is consistent.
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//
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MupCheckListIntegrity( MupTebLockList( ), MAX_LOCKS_HELD );
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//
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// The "lock level" of this thread is the highest level of the
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// locks currently held exclusively. If this thread holds no
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// locks, the lock level of the thread is 0 and it can acquire
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// any lock.
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//
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threadLockLevel = MupThreadLockLevel( );
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//
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// Make sure that the lock the thread is attempting to acquire
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// has a higher level than the last-acquired exclusive lock.
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// Note that a recursive exclusive acquisition of a lock should
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// succeed, even if a different, higher-level lock has been
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// acquired since the lock was originally acquired. Shared
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// acquisition of a lock that is already held exclusively must
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// fail.
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//
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if ( LOCK_LEVEL( Lock ) <= threadLockLevel ) {
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DbgPrint( "Thread %lx, last lock %s(%lx, L%lx) attempted to ",
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currentThread,
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MupThreadLockName( ), MupThreadLockAddress( ),
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threadLockLevel );
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DbgPrint( "acquire %s(%lx, L%lx) for %s access.\n",
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LOCK_NAME( Lock ), Lock, LOCK_LEVEL( Lock ),
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"exclusive" );
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DbgBreakPoint( );
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}
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}
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//
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// Acquire the lock.
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//
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ExAcquireResourceExclusiveLite( &Lock->Resource, TRUE );
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//
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// The thread acquired the lock for exlusive access.
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//
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if ( LOCK_NUMBER_OF_ACTIVE( Lock ) == -1 ) {
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if ( hasTeb ) {
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//
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// Insert the lock on the thread's list of locks.
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//
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ExInterlockedInsertHeadList(
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MupTebLockList( ),
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LOCK_THREAD_LIST( Lock ),
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&LockSpinLock
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);
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}
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}
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return;
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} // MupAcquireLock
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VOID
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MupReleaseLock(
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IN PMUP_LOCK Lock
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)
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/*++
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Routine Description:
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This routine releases a lock.
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Arguments:
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Lock - Supplies the lock to release
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Return Value:
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None.
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--*/
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{
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PKTHREAD currentThread;
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PTEB currentTeb;
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BOOLEAN hasTeb;
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PAGED_CODE( );
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currentThread = (PKTHREAD)ExGetCurrentResourceThread( );
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currentTeb = MupCurrentTeb( );
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hasTeb = HAS_TEB(currentTeb);
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//
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// Make sure the lock is really owned by the current thread.
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//
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if ( LOCK_NUMBER_OF_ACTIVE( Lock ) == 0 ) {
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// !!! Should crash server on internal error here.
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DbgPrint( "Thread %lx releasing unowned lock %s(%lx)\n",
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currentThread, LOCK_NAME( Lock ), Lock );
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DbgBreakPoint( );
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} else if ( (LOCK_NUMBER_OF_ACTIVE( Lock ) < 0) &&
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(LOCK_EXCLUSIVE_OWNER( Lock ) != (ULONG)currentThread) ) {
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// !!! Should crash server on internal error here.
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DbgPrint( "Thread %lx releasing lock %s(%lx) owned by "
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"thread %lx\n",
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currentThread, LOCK_NAME( Lock ), Lock,
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LOCK_EXCLUSIVE_OWNER( Lock ) );
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DbgBreakPoint( );
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} else if ( LOCK_NUMBER_OF_ACTIVE( Lock ) == -1 ) {
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//
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// The thread is fully releasing exclusive access to the lock.
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//
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if ( hasTeb ) {
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//
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// Remove the lock from the list of locks held by this
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// thread.
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//
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ExInterlockedRemoveHeadList(
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LOCK_THREAD_LIST( Lock )->Blink,
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&LockSpinLock
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);
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LOCK_THREAD_LIST( Lock )->Flink = NULL;
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LOCK_THREAD_LIST( Lock )->Blink = NULL;
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//
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// Make sure that the list of locks in the TEB is consistent.
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//
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MupCheckListIntegrity( MupTebLockList( ), MAX_LOCKS_HELD );
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}
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}
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//
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// Now actually do the release.
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//
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ExReleaseResourceLite( &Lock->Resource );
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return;
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} // MupReleaseLock
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ULONG
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MupCheckListIntegrity (
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IN PLIST_ENTRY ListHead,
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IN ULONG MaxEntries
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)
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/*++
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Routine Description:
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This debug routine checks the integrity of a doubly-linked list by
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walking the list forward and backward. If the number of elements is
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different in either direction, or there are too many entries in the
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list, execution is stopped.
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*** It is the responsibility of the calling routine to do any
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necessary synchronization.
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Arguments:
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ListHead - a pointer to the head of the list.
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MaxEntries - if the number of entries in the list exceeds this
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number, breakpoint.
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Return Value:
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ULONG - the number of entries in the list.
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--*/
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{
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PLIST_ENTRY current;
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ULONG entriesSoFar;
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ULONG flinkEntries;
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for ( current = ListHead->Flink, entriesSoFar = 0;
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current != ListHead;
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current = current->Flink ) {
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if ( ++entriesSoFar >= MaxEntries ) {
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DbgPrint( "Seen %ld entries in list at %lx\n",
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entriesSoFar, ListHead );
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DbgBreakPoint( );
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}
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}
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flinkEntries = entriesSoFar;
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for ( current = ListHead->Blink, entriesSoFar = 0;
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current != ListHead;
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current = current->Blink ) {
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if ( ++entriesSoFar >= MaxEntries ) {
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DbgPrint( "Seen %ld entries in list at %lx\n",
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entriesSoFar, ListHead );
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DbgBreakPoint( );
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}
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}
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if ( flinkEntries != entriesSoFar ) {
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DbgPrint( "In list %lx, Flink entries: %ld, Blink entries: %lx\n",
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ListHead, flinkEntries, entriesSoFar );
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DbgBreakPoint( );
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}
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return entriesSoFar;
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} // MupCheckListIntegrity
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#endif // MUPDBG
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