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104 lines
2.5 KiB
C
104 lines
2.5 KiB
C
/*
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* PROJECT: ReactOS Kernel
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* LICENSE: GPL - See COPYING in the top level directory
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* FILE: ntoskrnl/include/internal/spinlock.h
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* PURPOSE: Internal Inlined Functions for spinlocks, shared with HAL
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* PROGRAMMERS: Alex Ionescu (alex.ionescu@reactos.org)
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*/
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VOID
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NTAPI
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Kii386SpinOnSpinLock(PKSPIN_LOCK SpinLock, ULONG Flags);
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#ifndef CONFIG_SMP
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//
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// Spinlock Acquire at IRQL >= DISPATCH_LEVEL
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//
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FORCEINLINE
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VOID
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KxAcquireSpinLock(IN PKSPIN_LOCK SpinLock)
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{
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/* On UP builds, spinlocks don't exist at IRQL >= DISPATCH */
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UNREFERENCED_PARAMETER(SpinLock);
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/* Add an explicit memory barrier to prevent the compiler from reordering
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memory accesses across the borders of spinlocks */
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KeMemoryBarrierWithoutFence();
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}
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//
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// Spinlock Release at IRQL >= DISPATCH_LEVEL
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//
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FORCEINLINE
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VOID
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KxReleaseSpinLock(IN PKSPIN_LOCK SpinLock)
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{
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/* On UP builds, spinlocks don't exist at IRQL >= DISPATCH */
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UNREFERENCED_PARAMETER(SpinLock);
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/* Add an explicit memory barrier to prevent the compiler from reordering
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memory accesses across the borders of spinlocks */
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KeMemoryBarrierWithoutFence();
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}
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#else
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//
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// Spinlock Acquisition at IRQL >= DISPATCH_LEVEL
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//
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FORCEINLINE
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VOID
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KxAcquireSpinLock(IN PKSPIN_LOCK SpinLock)
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{
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#if DBG
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/* Make sure that we don't own the lock already */
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if (((KSPIN_LOCK)KeGetCurrentThread() | 1) == *SpinLock)
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{
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/* We do, bugcheck! */
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KeBugCheckEx(SPIN_LOCK_ALREADY_OWNED, (ULONG_PTR)SpinLock, 0, 0, 0);
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}
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#endif
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/* Try to acquire the lock */
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while (InterlockedBitTestAndSet((PLONG)SpinLock, 0))
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{
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#if defined(_M_IX86) && DBG
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/* On x86 debug builds, we use a much slower but useful routine */
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Kii386SpinOnSpinLock(SpinLock, 5);
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#else
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/* It's locked... spin until it's unlocked */
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while (*(volatile KSPIN_LOCK *)SpinLock & 1)
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{
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/* Yield and keep looping */
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YieldProcessor();
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}
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#endif
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}
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#if DBG
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/* On debug builds, we OR in the KTHREAD */
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*SpinLock = (KSPIN_LOCK)KeGetCurrentThread() | 1;
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#endif
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}
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//
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// Spinlock Release at IRQL >= DISPATCH_LEVEL
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//
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FORCEINLINE
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VOID
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KxReleaseSpinLock(IN PKSPIN_LOCK SpinLock)
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{
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#if DBG
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/* Make sure that the threads match */
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if (((KSPIN_LOCK)KeGetCurrentThread() | 1) != *SpinLock)
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{
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/* They don't, bugcheck */
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KeBugCheckEx(SPIN_LOCK_NOT_OWNED, (ULONG_PTR)SpinLock, 0, 0, 0);
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}
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#endif
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/* Clear the lock */
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InterlockedAnd((PLONG)SpinLock, 0);
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}
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#endif
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