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reactos/ntoskrnl/ke/spinlock.c

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/*
* PROJECT: ReactOS Kernel
* LICENSE: GPL - See COPYING in the top level directory
* FILE: ntoskrnl/ke/spinlock.c
* PURPOSE: Spinlock and Queued Spinlock Support
* PROGRAMMERS: Alex Ionescu (alex.ionescu@reactos.org)
*/
/* INCLUDES ******************************************************************/
#include <ntoskrnl.h>
#define NDEBUG
#include <debug.h>
#define LQ_WAIT 1
#define LQ_OWN 2
/* PRIVATE FUNCTIONS *********************************************************/
#if 0
//
// FIXME: The queued spinlock routines are broken.
//
VOID
FASTCALL
KeAcquireQueuedSpinLockAtDpcLevel(IN PKSPIN_LOCK_QUEUE LockHandle)
{
#ifdef CONFIG_SMP
PKSPIN_LOCK_QUEUE Prev;
/* Set the new lock */
Prev = (PKSPIN_LOCK_QUEUE)
InterlockedExchange((PLONG)LockHandle->Next,
(LONG)LockHandle);
if (!Prev)
{
/* There was nothing there before. We now own it */
*LockHandle->Lock |= LQ_OWN;
return;
}
/* Set the wait flag */
*LockHandle->Lock |= LQ_WAIT;
/* Link us */
Prev->Next = (PKSPIN_LOCK_QUEUE)LockHandle;
/* Loop and wait */
while (*LockHandle->Lock & LQ_WAIT)
YieldProcessor();
#endif
}
VOID
FASTCALL
KeReleaseQueuedSpinLockFromDpcLevel(IN PKSPIN_LOCK_QUEUE LockHandle)
{
#ifdef CONFIG_SMP
KSPIN_LOCK LockVal;
PKSPIN_LOCK_QUEUE Waiter;
/* Remove own and wait flags */
*LockHandle->Lock &= ~(LQ_OWN | LQ_WAIT);
LockVal = *LockHandle->Lock;
/* Check if we already own it */
if (LockVal == (KSPIN_LOCK)LockHandle)
{
/* Disown it */
LockVal = (KSPIN_LOCK)
InterlockedCompareExchangePointer(LockHandle->Lock,
NULL,
LockHandle);
}
if (LockVal == (KSPIN_LOCK)LockHandle) return;
/* Need to wait for it */
Waiter = LockHandle->Next;
while (!Waiter)
{
YieldProcessor();
Waiter = LockHandle->Next;
}
/* It's gone */
*(ULONG_PTR*)&Waiter->Lock ^= (LQ_OWN | LQ_WAIT);
LockHandle->Next = NULL;
#endif
}
#else
//
// HACK: Hacked to work like normal spinlocks
//
_IRQL_requires_min_(DISPATCH_LEVEL)
_Acquires_nonreentrant_lock_(*LockHandle->Lock)
_Acquires_exclusive_lock_(*LockHandle->Lock)
VOID
FASTCALL
KeAcquireQueuedSpinLockAtDpcLevel(_Inout_ PKSPIN_LOCK_QUEUE LockHandle)
{
#if defined(CONFIG_SMP) || DBG
/* Make sure we are at DPC or above! */
if (KeGetCurrentIrql() < DISPATCH_LEVEL)
{
/* We aren't -- bugcheck */
KeBugCheckEx(IRQL_NOT_GREATER_OR_EQUAL,
(ULONG_PTR)LockHandle->Lock,
KeGetCurrentIrql(),
0,
0);
}
#endif
/* Do the inlined function */
KxAcquireSpinLock(LockHandle->Lock);
}
_IRQL_requires_min_(DISPATCH_LEVEL)
_Releases_nonreentrant_lock_(*LockHandle->Lock)
_Releases_exclusive_lock_(*LockHandle->Lock)
VOID
FASTCALL
KeReleaseQueuedSpinLockFromDpcLevel(_Inout_ PKSPIN_LOCK_QUEUE LockHandle)
{
#if defined(CONFIG_SMP) || DBG
/* Make sure we are at DPC or above! */
if (KeGetCurrentIrql() < DISPATCH_LEVEL)
{
/* We aren't -- bugcheck */
KeBugCheckEx(IRQL_NOT_GREATER_OR_EQUAL,
(ULONG_PTR)LockHandle->Lock,
KeGetCurrentIrql(),
0,
0);
}
#endif
/* Do the inlined function */
KxReleaseSpinLock(LockHandle->Lock);
}
#endif
/* PUBLIC FUNCTIONS **********************************************************/
/*
* @implemented
*/
KIRQL
NTAPI
KeAcquireInterruptSpinLock(IN PKINTERRUPT Interrupt)
{
KIRQL OldIrql;
/* Raise IRQL */
KeRaiseIrql(Interrupt->SynchronizeIrql, &OldIrql);
/* Acquire spinlock on MP */
KeAcquireSpinLockAtDpcLevel(Interrupt->ActualLock);
return OldIrql;
}
/*
* @implemented
*/
VOID
NTAPI
KeReleaseInterruptSpinLock(IN PKINTERRUPT Interrupt,
IN KIRQL OldIrql)
{
/* Release lock on MP */
KeReleaseSpinLockFromDpcLevel(Interrupt->ActualLock);
/* Lower IRQL */
KeLowerIrql(OldIrql);
}
/*
* @implemented
*/
VOID
NTAPI
_KeInitializeSpinLock(IN PKSPIN_LOCK SpinLock)
{
/* Clear it */
*SpinLock = 0;
}
/*
* @implemented
*/
#undef KeAcquireSpinLockAtDpcLevel
VOID
NTAPI
KeAcquireSpinLockAtDpcLevel(IN PKSPIN_LOCK SpinLock)
{
/* Make sure we are at DPC or above! */
if (KeGetCurrentIrql() < DISPATCH_LEVEL)
{
/* We aren't -- bugcheck */
KeBugCheckEx(IRQL_NOT_GREATER_OR_EQUAL,
(ULONG_PTR)SpinLock,
KeGetCurrentIrql(),
0,
0);
}
/* Do the inlined function */
KxAcquireSpinLock(SpinLock);
}
/*
* @implemented
*/
#undef KeReleaseSpinLockFromDpcLevel
VOID
NTAPI
KeReleaseSpinLockFromDpcLevel(IN PKSPIN_LOCK SpinLock)
{
/* Make sure we are at DPC or above! */
if (KeGetCurrentIrql() < DISPATCH_LEVEL)
{
/* We aren't -- bugcheck */
KeBugCheckEx(IRQL_NOT_GREATER_OR_EQUAL,
(ULONG_PTR)SpinLock,
KeGetCurrentIrql(),
0,
0);
}
/* Do the inlined function */
KxReleaseSpinLock(SpinLock);
}
/*
* @implemented
*/
VOID
FASTCALL
KefAcquireSpinLockAtDpcLevel(IN PKSPIN_LOCK SpinLock)
{
/* Make sure we are at DPC or above! */
if (KeGetCurrentIrql() < DISPATCH_LEVEL)
{
/* We aren't -- bugcheck */
KeBugCheckEx(IRQL_NOT_GREATER_OR_EQUAL,
(ULONG_PTR)SpinLock,
KeGetCurrentIrql(),
0,
0);
}
/* Do the inlined function */
KxAcquireSpinLock(SpinLock);
}
/*
* @implemented
*/
VOID
FASTCALL
KefReleaseSpinLockFromDpcLevel(IN PKSPIN_LOCK SpinLock)
{
/* Make sure we are at DPC or above! */
if (KeGetCurrentIrql() < DISPATCH_LEVEL)
{
/* We aren't -- bugcheck */
KeBugCheckEx(IRQL_NOT_GREATER_OR_EQUAL,
(ULONG_PTR)SpinLock,
KeGetCurrentIrql(),
0,
0);
}
/* Do the inlined function */
KxReleaseSpinLock(SpinLock);
}
/*
* @implemented
*/
VOID
FASTCALL
KiAcquireSpinLock(IN PKSPIN_LOCK SpinLock)
{
/* Do the inlined function */
KxAcquireSpinLock(SpinLock);
}
/*
* @implemented
*/
VOID
FASTCALL
KiReleaseSpinLock(IN PKSPIN_LOCK SpinLock)
{
/* Do the inlined function */
KxReleaseSpinLock(SpinLock);
}
/*
* @implemented
*/
BOOLEAN
FASTCALL
KeTryToAcquireSpinLockAtDpcLevel(IN OUT PKSPIN_LOCK SpinLock)
{
#if DBG
/* Make sure we are at DPC or above! */
if (KeGetCurrentIrql() < DISPATCH_LEVEL)
{
/* We aren't -- bugcheck */
KeBugCheckEx(IRQL_NOT_GREATER_OR_EQUAL,
(ULONG_PTR)SpinLock,
KeGetCurrentIrql(),
0,
0);
}
/* Make sure that we don't own the lock already */
if (((KSPIN_LOCK)KeGetCurrentThread() | 1) == *SpinLock)
{
/* We do, bugcheck! */
KeBugCheckEx(SPIN_LOCK_ALREADY_OWNED, (ULONG_PTR)SpinLock, 0, 0, 0);
}
#endif
#ifdef CONFIG_SMP
/* Check if it's already acquired */
if (!(*SpinLock))
{
/* Try to acquire it */
if (InterlockedBitTestAndSet((PLONG)SpinLock, 0))
{
/* Someone else acquired it */
return FALSE;
}
}
else
{
/* It was already acquired */
return FALSE;
}
#endif
#if DBG
/* On debug builds, we OR in the KTHREAD */
*SpinLock = (ULONG_PTR)KeGetCurrentThread() | 1;
#endif
/* All is well, return TRUE */
return TRUE;
}
/*
* @implemented
*/
VOID
FASTCALL
KeAcquireInStackQueuedSpinLockAtDpcLevel(IN PKSPIN_LOCK SpinLock,
IN PKLOCK_QUEUE_HANDLE LockHandle)
{
/* Set it up properly */
LockHandle->LockQueue.Next = NULL;
LockHandle->LockQueue.Lock = SpinLock;
#ifdef CONFIG_SMP
#if 0
KeAcquireQueuedSpinLockAtDpcLevel(LockHandle->LockQueue.Next);
#else
/* Make sure we are at DPC or above! */
if (KeGetCurrentIrql() < DISPATCH_LEVEL)
{
/* We aren't -- bugcheck */
KeBugCheckEx(IRQL_NOT_GREATER_OR_EQUAL,
(ULONG_PTR)LockHandle->LockQueue.Lock,
KeGetCurrentIrql(),
0,
0);
}
#endif
#endif
/* Acquire the lock */
KxAcquireSpinLock(LockHandle->LockQueue.Lock); // HACK
}
/*
* @implemented
*/
VOID
FASTCALL
KeReleaseInStackQueuedSpinLockFromDpcLevel(IN PKLOCK_QUEUE_HANDLE LockHandle)
{
#ifdef CONFIG_SMP
#if 0
/* Call the internal function */
KeReleaseQueuedSpinLockFromDpcLevel(LockHandle->LockQueue.Next);
#else
/* Make sure we are at DPC or above! */
if (KeGetCurrentIrql() < DISPATCH_LEVEL)
{
/* We aren't -- bugcheck */
KeBugCheckEx(IRQL_NOT_GREATER_OR_EQUAL,
(ULONG_PTR)LockHandle->LockQueue.Lock,
KeGetCurrentIrql(),
0,
0);
}
#endif
#endif
/* Release the lock */
KxReleaseSpinLock(LockHandle->LockQueue.Lock); // HACK
}
/*
* @unimplemented
*/
KIRQL
FASTCALL
KeAcquireSpinLockForDpc(IN PKSPIN_LOCK SpinLock)
{
UNIMPLEMENTED;
return 0;
}
/*
* @unimplemented
*/
VOID
FASTCALL
KeReleaseSpinLockForDpc(IN PKSPIN_LOCK SpinLock,
IN KIRQL OldIrql)
{
UNIMPLEMENTED;
}
/*
* @implemented
*/
VOID
FASTCALL
KeAcquireInStackQueuedSpinLockForDpc(IN PKSPIN_LOCK SpinLock,
IN PKLOCK_QUEUE_HANDLE LockHandle)
{
LockHandle->OldIrql = KeGetCurrentIrql();
if (LockHandle->OldIrql >= DISPATCH_LEVEL)
KeAcquireInStackQueuedSpinLockAtDpcLevel(SpinLock, LockHandle);
else
KeAcquireInStackQueuedSpinLock(SpinLock, LockHandle);
}
/*
* @implemented
*/
VOID
FASTCALL
KeReleaseInStackQueuedSpinLockForDpc(IN PKLOCK_QUEUE_HANDLE LockHandle)
{
if (LockHandle->OldIrql >= DISPATCH_LEVEL)
KeReleaseInStackQueuedSpinLockFromDpcLevel(LockHandle);
else
KeReleaseInStackQueuedSpinLock(LockHandle);
}
/*
* @implemented
*/
BOOLEAN
FASTCALL
KeTestSpinLock(IN PKSPIN_LOCK SpinLock)
{
/* Test this spinlock */
if (*SpinLock)
{
/* Spinlock is busy, yield execution */
YieldProcessor();
/* Return busy flag */
return FALSE;
}
/* Spinlock appears to be free */
return TRUE;
}
#ifdef _M_IX86
VOID
NTAPI
Kii386SpinOnSpinLock(PKSPIN_LOCK SpinLock, ULONG Flags)
{
// FIXME: Handle flags
UNREFERENCED_PARAMETER(Flags);
/* Spin until it's unlocked */
while (*(volatile KSPIN_LOCK *)SpinLock & 1)
{
// FIXME: Check for timeout
/* Yield and keep looping */
YieldProcessor();
}
}
#endif
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