spinlock.c

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/*
 * PROJECT:         ReactOS HAL
 * LICENSE:         GPL - See COPYING in the top level directory
 * FILE:            ntoskrnl/ke/amd64/spinlock.c
 * PURPOSE:         Spinlock and Queued Spinlock Support
 * PROGRAMMERS:     Alex Ionescu (alex.ionescu@reactos.org)
 */
 
/* INCLUDES ******************************************************************/
 
#include <ntoskrnl.h>
#define NDEBUG
#include <debug.h>
 
#undef KeAcquireSpinLock
#undef KeReleaseSpinLock
 
/* FUNCTIONS *****************************************************************/
 
/*
 * @implemented
 */
KIRQL
KeAcquireSpinLockRaiseToSynch(PKSPIN_LOCK SpinLock)
{
    KIRQL OldIrql;
 
    /* Raise to sync */
    KeRaiseIrql(SYNCH_LEVEL, &OldIrql);
 
    /* Acquire the lock and return */
    KxAcquireSpinLock(SpinLock);
    return OldIrql;
}
 
/*
 * @implemented
 */
KIRQL
NTAPI
KeAcquireSpinLockRaiseToDpc(PKSPIN_LOCK SpinLock)
{
    KIRQL OldIrql;
 
    /* Raise to dispatch */
    KeRaiseIrql(DISPATCH_LEVEL, &OldIrql);
 
    /* Acquire the lock and return */
    KxAcquireSpinLock(SpinLock);
    return OldIrql;
}
 
/*
 * @implemented
 */
VOID
NTAPI
KeReleaseSpinLock(PKSPIN_LOCK SpinLock,
                  KIRQL OldIrql)
{
    /* Release the lock and lower IRQL back */
    KxReleaseSpinLock(SpinLock);
    KeLowerIrql(OldIrql);
}
 
/*
 * @implemented
 */
KIRQL
KeAcquireQueuedSpinLock(IN KSPIN_LOCK_QUEUE_NUMBER LockNumber)
{
    KIRQL OldIrql;
 
    /* Raise to dispatch */
    KeRaiseIrql(DISPATCH_LEVEL, &OldIrql);
 
    /* Acquire the lock */
    KxAcquireSpinLock(KeGetCurrentPrcb()->LockQueue[LockNumber].Lock); // HACK
    return OldIrql;
}
 
/*
 * @implemented
 */
KIRQL
KeAcquireQueuedSpinLockRaiseToSynch(IN KSPIN_LOCK_QUEUE_NUMBER LockNumber)
{
    KIRQL OldIrql;
 
    /* Raise to synch */
    KeRaiseIrql(SYNCH_LEVEL, &OldIrql);
 
    /* Acquire the lock */
    KxAcquireSpinLock(KeGetCurrentPrcb()->LockQueue[LockNumber].Lock); // HACK
    return OldIrql;
}
 
/*
 * @implemented
 */
VOID
KeAcquireInStackQueuedSpinLock(IN PKSPIN_LOCK SpinLock,
                               IN PKLOCK_QUEUE_HANDLE LockHandle)
{
    /* Set up the lock */
    LockHandle->LockQueue.Next = NULL;
    LockHandle->LockQueue.Lock = SpinLock;
 
    /* Raise to dispatch */
    KeRaiseIrql(DISPATCH_LEVEL, &LockHandle->OldIrql);
 
    /* Acquire the lock */
    KxAcquireSpinLock(LockHandle->LockQueue.Lock); // HACK
}
 
 
/*
 * @implemented
 */
VOID
KeAcquireInStackQueuedSpinLockRaiseToSynch(IN PKSPIN_LOCK SpinLock,
                                           IN PKLOCK_QUEUE_HANDLE LockHandle)
{
    /* Set up the lock */
    LockHandle->LockQueue.Next = NULL;
    LockHandle->LockQueue.Lock = SpinLock;
 
    /* Raise to synch */
    KeRaiseIrql(SYNCH_LEVEL, &LockHandle->OldIrql);
 
    /* Acquire the lock */
    KxAcquireSpinLock(LockHandle->LockQueue.Lock); // HACK
}
 
 
/*
 * @implemented
 */
VOID
KeReleaseQueuedSpinLock(IN KSPIN_LOCK_QUEUE_NUMBER LockNumber,
                        IN KIRQL OldIrql)
{
    /* Release the lock */
    KxReleaseSpinLock(KeGetCurrentPrcb()->LockQueue[LockNumber].Lock); // HACK
 
    /* Lower IRQL back */
    KeLowerIrql(OldIrql);
}
 
 
/*
 * @implemented
 */
VOID
KeReleaseInStackQueuedSpinLock(IN PKLOCK_QUEUE_HANDLE LockHandle)
{
    /* Simply lower IRQL back */
    KxReleaseSpinLock(LockHandle->LockQueue.Lock); // HACK
    KeLowerIrql(LockHandle->OldIrql);
}
 
 
/*
 * @implemented
 */
BOOLEAN
KeTryToAcquireQueuedSpinLockRaiseToSynch(IN KSPIN_LOCK_QUEUE_NUMBER LockNumber,
                                         IN PKIRQL OldIrql)
{
    /* Raise to synch level */
    KeRaiseIrql(SYNCH_LEVEL, OldIrql);
 
#ifdef CONFIG_SMP
    // HACK
    return KeTryToAcquireSpinLockAtDpcLevel(KeGetCurrentPrcb()->LockQueue[LockNumber].Lock);
#else
    /* Add an explicit memory barrier to prevent the compiler from reordering
       memory accesses across the borders of spinlocks */
    KeMemoryBarrierWithoutFence();
 
    /* Always return true on UP Machines */
    return TRUE;
#endif
}
 
/*
 * @implemented
 */
LOGICAL
KeTryToAcquireQueuedSpinLock(IN KSPIN_LOCK_QUEUE_NUMBER LockNumber,
                             OUT PKIRQL OldIrql)
{
    /* Raise to dispatch level */
    KeRaiseIrql(DISPATCH_LEVEL, OldIrql);
 
#ifdef CONFIG_SMP
    // HACK
    return KeTryToAcquireSpinLockAtDpcLevel(KeGetCurrentPrcb()->LockQueue[LockNumber].Lock);
#else
 
    /* Add an explicit memory barrier to prevent the compiler from reordering
       memory accesses across the borders of spinlocks */
    KeMemoryBarrierWithoutFence();
 
    /* Always return true on UP Machines */
    return TRUE;
#endif
}
 
/* EOF */