Module: wine Branch: master Commit: b13a00f82b54cfd238b519a658685023ad748a67 URL: https://source.winehq.org/git/wine.git/?a=commit;h=b13a00f82b54cfd238b519a65...
Author: Zebediah Figura z.figura12@gmail.com Date: Mon Apr 8 22:30:14 2019 -0500
ntoskrnl.exe: Implement ExAcquireSharedWaitForExclusive().
Signed-off-by: Zebediah Figura z.figura12@gmail.com Signed-off-by: Alexandre Julliard julliard@winehq.org
---
dlls/ntoskrnl.exe/ntoskrnl.exe.spec | 2 +- dlls/ntoskrnl.exe/sync.c | 62 +++++++++++++++++++++++++++++++++++++ include/ddk/wdm.h | 1 + 3 files changed, 64 insertions(+), 1 deletion(-)
diff --git a/dlls/ntoskrnl.exe/ntoskrnl.exe.spec b/dlls/ntoskrnl.exe/ntoskrnl.exe.spec index 347febb..ee26d8b 100644 --- a/dlls/ntoskrnl.exe/ntoskrnl.exe.spec +++ b/dlls/ntoskrnl.exe/ntoskrnl.exe.spec @@ -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) diff --git a/dlls/ntoskrnl.exe/sync.c b/dlls/ntoskrnl.exe/sync.c index 2b362ef..e89fddc 100644 --- a/dlls/ntoskrnl.exe/sync.c +++ b/dlls/ntoskrnl.exe/sync.c @@ -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; +} diff --git a/include/ddk/wdm.h b/include/ddk/wdm.h index 8023fda..4609790 100644 --- a/include/ddk/wdm.h +++ b/include/ddk/wdm.h @@ -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);