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ntoskrnl.exe: Implement ExAcquireSharedWaitForExclusive(). 

Signed-off-by: Zebediah Figura <z.figura12@gmail.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Zebediah Figura 2019-04-08 22:30:14 -05:00 committed by Alexandre Julliard
parent f0499323d8
commit b13a00f82b
3 changed files with 64 additions and 1 deletions
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2
dlls/ntoskrnl.exe/ntoskrnl.exe.spec
View File

@ -123,7 +123,7 @@
@ stdcall ExAcquireResourceExclusiveLite(ptr long)
@ stdcall ExAcquireResourceSharedLite(ptr long)
@ stdcall ExAcquireSharedStarveExclusive(ptr long)
@ stub ExAcquireSharedWaitForExclusive
@ stdcall ExAcquireSharedWaitForExclusive(ptr long)
@ stub ExAllocateFromPagedLookasideList
@ stdcall ExAllocatePool(long long)
@ stdcall ExAllocatePoolWithQuota(long long)

62
dlls/ntoskrnl.exe/sync.c
View File

@ -944,3 +944,65 @@ BOOLEAN WINAPI ExAcquireSharedStarveExclusive( ERESOURCE *resource, BOOLEAN wait
return TRUE;
}
/***********************************************************************
* ExAcquireSharedWaitForExclusive (NTOSKRNL.EXE.@)
*/
BOOLEAN WINAPI ExAcquireSharedWaitForExclusive( ERESOURCE *resource, BOOLEAN wait )
{
OWNER_ENTRY *entry;
KIRQL irql;
TRACE("resource %p, wait %u.\n", resource, wait);
KeAcquireSpinLock( &resource->SpinLock, &irql );
entry = resource_get_shared_entry( resource, (ERESOURCE_THREAD)KeGetCurrentThread() );
if (resource->Flag & ResourceOwnedExclusive)
{
if (resource->OwnerEntry.OwnerThread == (ERESOURCE_THREAD)KeGetCurrentThread())
{
/* We own the resource exclusively, so increase recursion. */
resource->ActiveEntries++;
KeReleaseSpinLock( &resource->SpinLock, irql );
return TRUE;
}
}
/* We may only grab the resource if there are no exclusive waiters, even if
* we already own it shared. */
else if (!resource->NumberOfExclusiveWaiters)
{
entry->OwnerCount++;
resource->ActiveEntries++;
KeReleaseSpinLock( &resource->SpinLock, irql );
return TRUE;
}
if (!wait)
{
KeReleaseSpinLock( &resource->SpinLock, irql );
return FALSE;
}
if (!resource->SharedWaiters)
{
resource->SharedWaiters = heap_alloc( sizeof(*resource->SharedWaiters) );
KeInitializeSemaphore( resource->SharedWaiters, 0, INT_MAX );
}
resource->NumberOfSharedWaiters++;
KeReleaseSpinLock( &resource->SpinLock, irql );
KeWaitForSingleObject( resource->SharedWaiters, Executive, KernelMode, FALSE, NULL );
KeAcquireSpinLock( &resource->SpinLock, &irql );
entry->OwnerCount++;
resource->ActiveEntries++;
resource->NumberOfSharedWaiters--;
KeReleaseSpinLock( &resource->SpinLock, irql );
return TRUE;
}

1
include/ddk/wdm.h
View File

@ -1515,6 +1515,7 @@ void WINAPI ExAcquireFastMutexUnsafe(PFAST_MUTEX);
BOOLEAN WINAPI ExAcquireResourceExclusiveLite(ERESOURCE*,BOOLEAN);
BOOLEAN WINAPI ExAcquireResourceSharedLite(ERESOURCE*,BOOLEAN);
BOOLEAN WINAPI ExAcquireSharedStarveExclusive(ERESOURCE*,BOOLEAN);
BOOLEAN WINAPI ExAcquireSharedWaitForExclusive(ERESOURCE*,BOOLEAN);
PVOID WINAPI ExAllocatePool(POOL_TYPE,SIZE_T);
PVOID WINAPI ExAllocatePoolWithQuota(POOL_TYPE,SIZE_T);
PVOID WINAPI ExAllocatePoolWithTag(POOL_TYPE,SIZE_T,ULONG);