/*
- * COPYRIGHT: See COPYING in the top level directory
- * PROJECT: ReactOS project
- * FILE: ntoskrnl/ke/wait.c
- * PURPOSE: Manages non-busy waiting
- * PROGRAMMER: David Welch (welch@mcmail.com)
- * REVISION HISTORY:
- * 21/07/98: Created
- * 12/1/99: Phillip Susi: Fixed wake code in KeDispatcherObjectWake
- * so that things like KeWaitForXXX() return the correct value
- */
-
-/* NOTES ********************************************************************
- *
+ * PROJECT: ReactOS Kernel
+ * LICENSE: GPL - See COPYING in the top level directory
+ * FILE: ntoskrnl/ke/wait.c
+ * PURPOSE: Manages waiting for Dispatcher Objects
+ * PROGRAMMERS: Alex Ionescu (alex.ionescu@reactos.org)
+ * Gunnar Dalsnes
*/
/* INCLUDES ******************************************************************/
-#include <ddk/ntddk.h>
-#include <internal/ke.h>
-#include <internal/ps.h>
-#include <internal/ob.h>
-#include <internal/id.h>
-#include <ntos/ntdef.h>
-
+#include <ntoskrnl.h>
#define NDEBUG
#include <internal/debug.h>
/* GLOBALS ******************************************************************/
-static KSPIN_LOCK DispatcherDatabaseLock;
-static BOOLEAN WaitSet = FALSE;
-static KIRQL oldlvl = PASSIVE_LEVEL;
-static PKTHREAD Owner = NULL;
-
-#define KeDispatcherObjectWakeOne(hdr) KeDispatcherObjectWakeOneOrAll(hdr, FALSE)
-#define KeDispatcherObjectWakeAll(hdr) KeDispatcherObjectWakeOneOrAll(hdr, TRUE)
+KSPIN_LOCK DispatcherDatabaseLock;
-/* FUNCTIONS *****************************************************************/
+/* PRIVATE FUNCTIONS *********************************************************/
-VOID KeInitializeDispatcherHeader(DISPATCHER_HEADER* Header,
- ULONG Type,
- ULONG Size,
- ULONG SignalState)
+VOID
+FASTCALL
+KiWaitSatisfyAll(PKWAIT_BLOCK FirstBlock)
{
- Header->Type = Type;
- Header->Absolute = 0;
- Header->Inserted = 0;
- Header->Size = Size;
- Header->SignalState = SignalState;
- InitializeListHead(&(Header->WaitListHead));
+ PKWAIT_BLOCK WaitBlock = FirstBlock;
+ PKTHREAD WaitThread = WaitBlock->Thread;
+
+ /* Loop through all the Wait Blocks, and wake each Object */
+ do
+ {
+ /* Make sure it hasn't timed out */
+ if (WaitBlock->WaitKey != STATUS_TIMEOUT)
+ {
+ /* Wake the Object */
+ KiSatisfyObjectWait((PKMUTANT)WaitBlock->Object, WaitThread);
+ }
+
+ /* Move to the next block */
+ WaitBlock = WaitBlock->NextWaitBlock;
+ } while (WaitBlock != FirstBlock);
}
-VOID KeAcquireDispatcherDatabaseLock(BOOLEAN Wait)
-/*
- * PURPOSE: Acquires the dispatcher database lock for the caller
- */
+VOID
+FASTCALL
+KiWaitTest(IN PVOID ObjectPointer,
+ IN KPRIORITY Increment)
{
- DPRINT("KeAcquireDispatcherDatabaseLock(Wait %x)\n",Wait);
- if (WaitSet && Owner == KeGetCurrentThread())
- {
- return;
- }
- KeAcquireSpinLock(&DispatcherDatabaseLock, &oldlvl);
- WaitSet = Wait;
- Owner = KeGetCurrentThread();
+ PLIST_ENTRY WaitEntry;
+ PLIST_ENTRY WaitList;
+ PKWAIT_BLOCK CurrentWaitBlock;
+ PKWAIT_BLOCK NextWaitBlock;
+ PKTHREAD WaitThread;
+ PKMUTANT FirstObject = ObjectPointer, Object;
+
+ /* Loop the Wait Entries */
+ WaitList = &FirstObject->Header.WaitListHead;
+ WaitEntry = WaitList->Flink;
+ while ((FirstObject->Header.SignalState > 0) &&
+ (WaitEntry != WaitList))
+ {
+ /* Get the current wait block */
+ CurrentWaitBlock = CONTAINING_RECORD(WaitEntry,
+ KWAIT_BLOCK,
+ WaitListEntry);
+ WaitThread = CurrentWaitBlock->Thread;
+
+ /* Check the current Wait Mode */
+ if (CurrentWaitBlock->WaitType == WaitAny)
+ {
+ /* Easy case, satisfy only this wait */
+ WaitEntry = WaitEntry->Blink;
+ KiSatisfyObjectWait(FirstObject, WaitThread);
+ }
+ else
+ {
+ /* Everything must be satisfied */
+ NextWaitBlock = CurrentWaitBlock->NextWaitBlock;
+
+ /* Loop first to make sure they are valid */
+ while (NextWaitBlock != CurrentWaitBlock)
+ {
+ /* Make sure this isn't a timeout block */
+ if (NextWaitBlock->WaitKey != STATUS_TIMEOUT)
+ {
+ /* Get the object */
+ Object = NextWaitBlock->Object;
+
+ /* Check if this is a mutant */
+ if ((Object->Header.Type == MutantObject) &&
+ (Object->Header.SignalState <= 0) &&
+ (WaitThread == Object->OwnerThread))
+ {
+ /* It's a signaled mutant */
+ }
+ else if (Object->Header.SignalState <= 0)
+ {
+ /* Skip the unwaiting */
+ goto SkipUnwait;
+ }
+ }
+
+ /* Go to the next Wait block */
+ NextWaitBlock = NextWaitBlock->NextWaitBlock;
+ }
+
+ /* All the objects are signaled, we can satisfy */
+ WaitEntry = WaitEntry->Blink;
+ KiWaitSatisfyAll(CurrentWaitBlock);
+ }
+
+ /* All waits satisfied, unwait the thread */
+ KiAbortWaitThread(WaitThread, CurrentWaitBlock->WaitKey, Increment);
+
+SkipUnwait:
+ /* Next entry */
+ WaitEntry = WaitEntry->Flink;
+ }
}
-VOID KeReleaseDispatcherDatabaseLockAtDpcLevel(BOOLEAN Wait)
+/* Must be called with the dispatcher lock held */
+VOID
+FASTCALL
+KiAbortWaitThread(IN PKTHREAD Thread,
+ IN NTSTATUS WaitStatus,
+ IN KPRIORITY Increment)
{
- DPRINT("KeReleaseDispatcherDatabaseLockAtDpcLevel(Wait %x)\n", Wait);
- assert(Wait == WaitSet);
- if (!Wait)
+ PKWAIT_BLOCK WaitBlock;
+ PKTIMER Timer;
+ LONG NewPriority;
+
+ /* Update wait status */
+ Thread->WaitStatus |= WaitStatus;
+
+ /* Remove the Wait Blocks from the list */
+ WaitBlock = Thread->WaitBlockList;
+ do
+ {
+ /* Remove it */
+ RemoveEntryList(&WaitBlock->WaitListEntry);
+
+ /* Go to the next one */
+ WaitBlock = WaitBlock->NextWaitBlock;
+ } while (WaitBlock != Thread->WaitBlockList);
+
+ /* Remove the thread from the wait list! */
+ if (Thread->WaitListEntry.Flink) RemoveEntryList(&Thread->WaitListEntry);
+
+ /* Check if there's a Thread Timer */
+ Timer = &Thread->Timer;
+ if (Timer->Header.Inserted)
+ {
+ /* Remove the timer */
+ Timer->Header.Inserted = FALSE;
+ RemoveEntryList(&Timer->TimerListEntry);
+ //KiRemoveTimer(Timer);
+ }
+
+ /* Increment the Queue's active threads */
+ if (Thread->Queue) Thread->Queue->CurrentCount++;
+
+ /* Check if this is a non-RT thread */
+ if (Thread->Priority < LOW_REALTIME_PRIORITY)
+ {
+ /* Check if boosting is enabled and we can boost */
+ if (!(Thread->DisableBoost) && !(Thread->PriorityDecrement))
+ {
+ /* We can boost, so calculate the new priority */
+ NewPriority = Thread->BasePriority + Increment;
+ if (NewPriority > Thread->Priority)
+ {
+ /* Make sure the new priority wouldn't push the thread to RT */
+ if (NewPriority >= LOW_REALTIME_PRIORITY)
+ {
+ /* Set it just before the RT zone */
+ Thread->Priority = LOW_REALTIME_PRIORITY - 1;
+ }
+ else
+ {
+ /* Otherwise, set our calculated priority */
+ Thread->Priority = NewPriority;
+ }
+ }
+ }
+
+ /* Check if this is a high-priority thread */
+ if (Thread->BasePriority >= 14)
+ {
+ /* It is, simply reset the quantum */
+ Thread->Quantum = Thread->QuantumReset;
+ }
+ else
+ {
+ /* Otherwise, decrease quantum */
+ Thread->Quantum--;
+ if (Thread->Quantum <= 0)
+ {
+ /* We've went below 0, reset it */
+ Thread->Quantum = Thread->QuantumReset;
+
+ /* Apply per-quantum priority decrement */
+ Thread->Priority -= (Thread->PriorityDecrement + 1);
+ if (Thread->Priority < Thread->BasePriority)
+ {
+ /* We've went too low, reset it */
+ Thread->Priority = Thread->BasePriority;
+ }
+
+ /* Delete per-quantum decrement */
+ Thread->PriorityDecrement = 0;
+ }
+ }
+ }
+ else
{
- Owner = NULL;
- KeReleaseSpinLockFromDpcLevel(&DispatcherDatabaseLock);
+ /* For real time threads, just reset the quantum */
+ Thread->Quantum = Thread->QuantumReset;
}
+
+ /* Reschedule the Thread */
+ KiReadyThread(Thread);
}
-VOID KeReleaseDispatcherDatabaseLock(BOOLEAN Wait)
+VOID
+FASTCALL
+KiAcquireFastMutex(IN PFAST_MUTEX FastMutex)
{
- DPRINT("KeReleaseDispatcherDatabaseLock(Wait %x)\n",Wait);
- assert(Wait==WaitSet);
- if (!Wait)
- {
- Owner = NULL;
- KeReleaseSpinLock(&DispatcherDatabaseLock, oldlvl);
- }
+ /* Increase contention count */
+ FastMutex->Contention++;
+
+ /* Wait for the event */
+ KeWaitForSingleObject(&FastMutex->Gate,
+ WrMutex,
+ KernelMode,
+ FALSE,
+ NULL);
}
-static BOOLEAN
-KiSideEffectsBeforeWake(DISPATCHER_HEADER * hdr,
- PKTHREAD Thread)
-/*
- * FUNCTION: Perform side effects on object before a wait for a thread is
- * satisfied
- */
+VOID
+FASTCALL
+KiExitDispatcher(IN KIRQL OldIrql)
{
- BOOLEAN Abandoned = FALSE;
+ /* Check if it's the idle thread */
+ if (!(KeIsExecutingDpc()) &&
+ (OldIrql < DISPATCH_LEVEL) &&
+ (KeGetCurrentThread()) &&
+ (KeGetCurrentThread() == KeGetCurrentPrcb()->IdleThread))
+ {
+ /* Dispatch a new thread */
+ KiDispatchThreadNoLock(Ready);
+ }
+ else
+ {
+ /* Otherwise just release the lock */
+ KeReleaseDispatcherDatabaseLockFromDpcLevel();
+ }
- switch (hdr->Type)
- {
- case InternalSynchronizationEvent:
- hdr->SignalState = 0;
- break;
+ /* Lower irql back */
+ KeLowerIrql(OldIrql);
+}
- case InternalSemaphoreType:
- hdr->SignalState--;
- break;
+/* PUBLIC FUNCTIONS **********************************************************/
+
+/*
+ * @implemented
+ */
+NTSTATUS
+NTAPI
+KeDelayExecutionThread(IN KPROCESSOR_MODE WaitMode,
+ IN BOOLEAN Alertable,
+ IN PLARGE_INTEGER Interval OPTIONAL)
+{
+ PKWAIT_BLOCK TimerWaitBlock;
+ PKTIMER ThreadTimer;
+ PKTHREAD CurrentThread = KeGetCurrentThread();
+ NTSTATUS WaitStatus = STATUS_SUCCESS;
+ BOOLEAN Swappable;
+ PLARGE_INTEGER OriginalDueTime = Interval;
+ LARGE_INTEGER DueTime, NewDueTime;
+
+ /* Check if the lock is already held */
+ if (CurrentThread->WaitNext)
+ {
+ /* Lock is held, disable Wait Next */
+ CurrentThread->WaitNext = FALSE;
+ }
+ else
+ {
+ /* Lock not held, acquire it */
+ CurrentThread->WaitIrql = KeAcquireDispatcherDatabaseLock();
+ }
- case InternalProcessType:
- break;
+ /* Use built-in Wait block */
+ TimerWaitBlock = &CurrentThread->WaitBlock[TIMER_WAIT_BLOCK];
- case InternalThreadType:
- break;
+ /* Start Wait Loop */
+ do
+ {
+ /* Check if a kernel APC is pending and we're below APC_LEVEL */
+ if ((CurrentThread->ApcState.KernelApcPending) &&
+ !(CurrentThread->SpecialApcDisable) &&
+ (CurrentThread->WaitIrql < APC_LEVEL))
+ {
+ /* Unlock the dispatcher */
+ KeReleaseDispatcherDatabaseLock(CurrentThread->WaitIrql);
+ }
+ else
+ {
+ /* Check if we can do an alertable wait, if requested */
+ KiCheckAlertability();
+
+ /* Check if we can swap the thread's stack */
+ CurrentThread->WaitListEntry.Flink = NULL;
+ KiCheckThreadStackSwap(WaitMode, CurrentThread, Swappable);
+
+ /* Set status */
+ CurrentThread->WaitStatus = STATUS_WAIT_0;
+
+ /* Set Timer */
+ ThreadTimer = &CurrentThread->Timer;
+
+ /* Setup the Wait Block */
+ CurrentThread->WaitBlockList = TimerWaitBlock;
+ TimerWaitBlock->NextWaitBlock = TimerWaitBlock;
+
+ /* Link the timer to this Wait Block */
+ ThreadTimer->Header.WaitListHead.Flink =
+ &TimerWaitBlock->WaitListEntry;
+ ThreadTimer->Header.WaitListHead.Blink =
+ &TimerWaitBlock->WaitListEntry;
+
+ /* Insert the Timer into the Timer Lists and enable it */
+ if (!KiInsertTimer(ThreadTimer, *Interval))
+ {
+ /* FIXME: We should find a new ready thread */
+ WaitStatus = STATUS_SUCCESS;
+ break;
+ }
- case InternalNotificationEvent:
- break;
+ /* Save due time */
+ DueTime.QuadPart = ThreadTimer->DueTime.QuadPart;
- case InternalSynchronizationTimer:
- hdr->SignalState = FALSE;
- break;
+ /* Handle Kernel Queues */
+ if (CurrentThread->Queue) KiWakeQueue(CurrentThread->Queue);
- case InternalNotificationTimer:
- break;
+ /* Setup the wait information */
+ CurrentThread->Alertable = Alertable;
+ CurrentThread->WaitMode = WaitMode;
+ CurrentThread->WaitReason = DelayExecution;
+ CurrentThread->WaitTime = ((PLARGE_INTEGER)&KeTickCount)->LowPart;
+ CurrentThread->State = Waiting;
- case InternalMutexType:
- {
- PKMUTEX Mutex;
+ /* Find a new thread to run */
+ KiAddThreadToWaitList(CurrentThread, Swappable);
+ WaitStatus = KiSwapThread();
+ ASSERT_IRQL_LESS_OR_EQUAL(DISPATCH_LEVEL);
- Mutex = CONTAINING_RECORD(hdr, KMUTEX, Header);
- hdr->SignalState--;
- assert(hdr->SignalState <= 1);
- if (hdr->SignalState == 0)
- {
- if (Thread == NULL)
+ /* Check if we were executing an APC or if we timed out */
+ if (WaitStatus != STATUS_KERNEL_APC)
{
- DPRINT("Thread == NULL!\n");
- KeBugCheck(0);
+ /* This is a good thing */
+ if (WaitStatus == STATUS_TIMEOUT) WaitStatus = STATUS_SUCCESS;
+
+ /* Return Status */
+ return WaitStatus;
}
- Abandoned = Mutex->Abandoned;
- if (Thread != NULL)
- InsertTailList(&Thread->MutantListHead, &Mutex->MutantListEntry);
- Mutex->OwnerThread = Thread;
- Mutex->Abandoned = FALSE;
- }
- }
- break;
-
- default:
- DbgPrint("(%s:%d) Dispatcher object %x has unknown type\n", __FILE__, __LINE__, hdr);
- KeBugCheck(0);
- }
-
- return Abandoned;
-}
-static BOOLEAN
-KiIsObjectSignalled(DISPATCHER_HEADER * hdr,
- PKTHREAD Thread)
-{
- if (hdr->Type == InternalMutexType)
- {
- PKMUTEX Mutex;
-
- Mutex = CONTAINING_RECORD(hdr, KMUTEX, Header);
-
- assert(hdr->SignalState <= 1);
-
- if ((hdr->SignalState < 1 && Mutex->OwnerThread == Thread) || hdr->SignalState == 1)
- {
- return (TRUE);
- }
- else
- {
- return (FALSE);
- }
- }
-
- if (hdr->SignalState <= 0)
- {
- return (FALSE);
- }
- else
- {
- return (TRUE);
- }
-}
+ /* Recalculate due times */
+ Interval = KiRecalculateDueTime(OriginalDueTime,
+ &DueTime,
+ &NewDueTime);
+ }
-VOID KeRemoveAllWaitsThread(PETHREAD Thread, NTSTATUS WaitStatus)
-{
- PKWAIT_BLOCK WaitBlock;
- BOOLEAN WasWaiting = FALSE;
-
- KeAcquireDispatcherDatabaseLock(FALSE);
-
- WaitBlock = (PKWAIT_BLOCK)Thread->Tcb.WaitBlockList;
- if (WaitBlock != NULL)
- {
- WasWaiting = TRUE;
- }
- while (WaitBlock != NULL)
- {
- RemoveEntryList(&WaitBlock->WaitListEntry);
- WaitBlock = WaitBlock->NextWaitBlock;
- }
- Thread->Tcb.WaitBlockList = NULL;
-
- if (WasWaiting)
- {
- PsUnblockThread(Thread, &WaitStatus);
- }
-
- KeReleaseDispatcherDatabaseLock(FALSE);
+ /* Acquire again the lock */
+ CurrentThread->WaitIrql = KeAcquireDispatcherDatabaseLock();
+ } while (TRUE);
+
+ /* Release the Lock, we are done */
+ KeReleaseDispatcherDatabaseLock(CurrentThread->WaitIrql);
+ return WaitStatus;
}
-static BOOLEAN
-KeDispatcherObjectWakeOneOrAll(DISPATCHER_HEADER * hdr,
- BOOLEAN WakeAll)
+/*
+ * @implemented
+ */
+NTSTATUS
+NTAPI
+KeWaitForSingleObject(IN PVOID Object,
+ IN KWAIT_REASON WaitReason,
+ IN KPROCESSOR_MODE WaitMode,
+ IN BOOLEAN Alertable,
+ IN PLARGE_INTEGER Timeout OPTIONAL)
{
- PKWAIT_BLOCK Waiter;
- PKWAIT_BLOCK WaiterHead;
- PLIST_ENTRY EnumEntry;
- NTSTATUS Status;
- BOOLEAN Abandoned;
- BOOLEAN AllSignaled;
- BOOLEAN WakedAny = FALSE;
-
- DPRINT("KeDispatcherObjectWakeOnOrAll(hdr %x)\n", hdr);
- DPRINT ("hdr->WaitListHead.Flink %x hdr->WaitListHead.Blink %x\n",
- hdr->WaitListHead.Flink, hdr->WaitListHead.Blink);
-
- if (IsListEmpty(&hdr->WaitListHead))
- {
- return (FALSE);
- }
-
- //enum waiters for this dispatcher object
- EnumEntry = hdr->WaitListHead.Flink;
- while (EnumEntry != &hdr->WaitListHead && (WakeAll || !WakedAny))
- {
- WaiterHead = CONTAINING_RECORD(EnumEntry, KWAIT_BLOCK, WaitListEntry);
- DPRINT("current_entry %x current %x\n", EnumEntry, WaiterHead);
- EnumEntry = EnumEntry->Flink;
- assert(WaiterHead->Thread->WaitBlockList != NULL);
-
- Abandoned = FALSE;
-
- if (WaiterHead->WaitType == WaitAny)
- {
- DPRINT("WaitAny: Remove all wait blocks.\n");
- for (Waiter = WaiterHead->Thread->WaitBlockList; Waiter; Waiter = Waiter->NextWaitBlock)
- {
- RemoveEntryList(&Waiter->WaitListEntry);
- }
-
- WaiterHead->Thread->WaitBlockList = NULL;
-
- /*
- * If a WakeAll KiSideEffectsBeforeWake(hdr,.. will be called several times,
- * but thats ok since WakeAll objects has no sideeffects.
- */
- Abandoned = KiSideEffectsBeforeWake(hdr, WaiterHead->Thread) ? TRUE : Abandoned;
- }
- else
- {
- DPRINT("WaitAll: All WaitAll objects must be signaled.\n");
-
- AllSignaled = TRUE;
-
- //all WaitAll obj. for thread need to be signaled to satisfy a wake
- for (Waiter = WaiterHead->Thread->WaitBlockList; Waiter; Waiter = Waiter->NextWaitBlock)
- {
- //no need to check hdr since it has to be signaled
- if (Waiter->WaitType == WaitAll && Waiter->Object != hdr)
+ PKMUTANT CurrentObject;
+ PKWAIT_BLOCK WaitBlock;
+ PKWAIT_BLOCK TimerWaitBlock;
+ PKTIMER ThreadTimer;
+ PKTHREAD CurrentThread = KeGetCurrentThread();
+ NTSTATUS WaitStatus = STATUS_SUCCESS;
+ BOOLEAN Swappable;
+ LARGE_INTEGER DueTime, NewDueTime;
+ PLARGE_INTEGER OriginalDueTime = Timeout;
+
+ /* Check if the lock is already held */
+ if (CurrentThread->WaitNext)
+ {
+ /* Lock is held, disable Wait Next */
+ CurrentThread->WaitNext = FALSE;
+ }
+ else
+ {
+ /* Lock not held, acquire it */
+ CurrentThread->WaitIrql = KeAcquireDispatcherDatabaseLock();
+ }
+
+ /* Start the actual Loop */
+ WaitBlock = &CurrentThread->WaitBlock[0];
+ do
+ {
+ /* Check if a kernel APC is pending and we're below APC_LEVEL */
+ if ((CurrentThread->ApcState.KernelApcPending) &&
+ !(CurrentThread->SpecialApcDisable) &&
+ (CurrentThread->WaitIrql < APC_LEVEL))
+ {
+ /* Unlock the dispatcher */
+ KeReleaseDispatcherDatabaseLock(CurrentThread->WaitIrql);
+ }
+ else
+ {
+ /* Set default status */
+ CurrentThread->WaitStatus = STATUS_WAIT_0;
+
+ /* Get the Current Object */
+ CurrentObject = (PKMUTANT)Object;
+
+ /* Check if it's a mutant */
+ if (CurrentObject->Header.Type == MutantObject)
+ {
+ /* Check its signal state or if we own it */
+ if ((CurrentObject->Header.SignalState > 0) ||
+ (CurrentThread == CurrentObject->OwnerThread))
+ {
+ /* Just unwait this guy and exit */
+ if (CurrentObject->Header.SignalState != (LONG)MINLONG)
+ {
+ /* It has a normal signal state. Unwait and return */
+ KiSatisfyMutantWait(CurrentObject, CurrentThread);
+ WaitStatus = CurrentThread->WaitStatus;
+ goto DontWait;
+ }
+ else
+ {
+ /* Raise an exception (see wasm.ru) */
+ KeReleaseDispatcherDatabaseLock(CurrentThread->
+ WaitIrql);
+ ExRaiseStatus(STATUS_MUTANT_LIMIT_EXCEEDED);
+ }
+ }
+ }
+ else if (CurrentObject->Header.SignalState > 0)
{
- if (!KiIsObjectSignalled(Waiter->Object, Waiter->Thread))
- {
- AllSignaled = FALSE;
- break;
- }
+ /* Another satisfied object */
+ KiSatisfyNonMutantWait(CurrentObject, CurrentThread);
+ WaitStatus = STATUS_WAIT_0;
+ goto DontWait;
}
- }
- if (AllSignaled)
- {
- for (Waiter = WaiterHead->Thread->WaitBlockList; Waiter; Waiter = Waiter->NextWaitBlock)
+ /* Append wait block to the KTHREAD wait block list */
+ CurrentThread->WaitBlockList = WaitBlock;
+
+ /* Set up the Wait Block */
+ WaitBlock->Object = CurrentObject;
+ WaitBlock->WaitKey = (USHORT)(STATUS_SUCCESS);
+ WaitBlock->WaitType = WaitAny;
+
+ /* Make sure we can satisfy the Alertable request */
+ KiCheckAlertability();
+
+ /* Check if we can swap the thread's stack */
+ CurrentThread->WaitListEntry.Flink = NULL;
+ KiCheckThreadStackSwap(WaitMode, CurrentThread, Swappable);
+
+ /* Enable the Timeout Timer if there was any specified */
+ if (Timeout)
+ {
+ /* Fail if the timeout interval is actually 0 */
+ if (!Timeout->QuadPart)
+ {
+ /* Return a timeout */
+ WaitStatus = STATUS_TIMEOUT;
+ goto DontWait;
+ }
+
+ /* Point to Timer Wait Block and Thread Timer */
+ TimerWaitBlock = &CurrentThread->WaitBlock[TIMER_WAIT_BLOCK];
+ ThreadTimer = &CurrentThread->Timer;
+
+ /* Connect the Timer Wait Block */
+ WaitBlock->NextWaitBlock = TimerWaitBlock;
+
+ /* Set up the Timer Wait Block */
+ TimerWaitBlock->NextWaitBlock = WaitBlock;
+
+ /* Link the timer to this Wait Block */
+ ThreadTimer->Header.WaitListHead.Flink =
+ &TimerWaitBlock->WaitListEntry;
+ ThreadTimer->Header.WaitListHead.Blink =
+ &TimerWaitBlock->WaitListEntry;
+
+ /* Insert the Timer into the Timer Lists and enable it */
+ if (!KiInsertTimer(ThreadTimer, *Timeout))
+ {
+ /* Return a timeout if we couldn't insert the timer */
+ WaitStatus = STATUS_TIMEOUT;
+ goto DontWait;
+ }
+
+ /* Set the current due time */
+ DueTime.QuadPart = ThreadTimer->DueTime.QuadPart;
+ }
+ else
{
- RemoveEntryList(&Waiter->WaitListEntry);
+ /* No timer block, so just set our wait block as next */
+ WaitBlock->NextWaitBlock = WaitBlock;
+ }
+
+ /* Link the Object to this Wait Block */
+ InsertTailList(&CurrentObject->Header.WaitListHead,
+ &WaitBlock->WaitListEntry);
+
+ /* Handle Kernel Queues */
+ if (CurrentThread->Queue) KiWakeQueue(CurrentThread->Queue);
- if (Waiter->WaitType == WaitAll)
- {
- Abandoned = KiSideEffectsBeforeWake(Waiter->Object, Waiter->Thread)
- ? TRUE : Abandoned;
- }
+ /* Setup the wait information */
+ CurrentThread->Alertable = Alertable;
+ CurrentThread->WaitMode = WaitMode;
+ CurrentThread->WaitReason = WaitReason;
+ CurrentThread->WaitTime = ((PLARGE_INTEGER)&KeTickCount)->LowPart;
+ CurrentThread->State = Waiting;
- //no WaitAny objects can possibly be signaled since we are here
- assert(!(Waiter->WaitType == WaitAny
- && KiIsObjectSignalled(Waiter->Object, Waiter->Thread)));
+ /* Find a new thread to run */
+ KiAddThreadToWaitList(CurrentThread, Swappable);
+ WaitStatus = KiSwapThread();
+ ASSERT_IRQL_LESS_OR_EQUAL(DISPATCH_LEVEL);
+
+ /* Check if we were executing an APC */
+ if (WaitStatus != STATUS_KERNEL_APC) return WaitStatus;
+
+ /* Check if we had a timeout */
+ if (Timeout)
+ {
+ /* Recalculate due times */
+ Timeout = KiRecalculateDueTime(OriginalDueTime,
+ &DueTime,
+ &NewDueTime);
}
+ }
- WaiterHead->Thread->WaitBlockList = NULL;
- }
- }
-
- if (WaiterHead->Thread->WaitBlockList == NULL)
- {
- Status = WaiterHead->WaitKey;
- if (Abandoned)
- {
- DPRINT("Abandoned mutex among objects");
- Status += STATUS_ABANDONED_WAIT_0;
- }
-
- WakedAny = TRUE;
- DPRINT("Waking %x status = %x\n", WaiterHead->Thread, Status);
- PsUnblockThread(CONTAINING_RECORD(WaiterHead->Thread, ETHREAD, Tcb), &Status);
- }
- }
-
- return WakedAny;
-}
+ /* Acquire again the lock */
+ CurrentThread->WaitIrql = KeAcquireDispatcherDatabaseLock();
+ } while (TRUE);
+ /* Release the Lock, we are done */
+ KeReleaseDispatcherDatabaseLock(CurrentThread->WaitIrql);
+ return WaitStatus;
-BOOLEAN KeDispatcherObjectWake(DISPATCHER_HEADER* hdr)
-/*
- * FUNCTION: Wake threads waiting on a dispatcher object
- * NOTE: The exact semantics of waking are dependant on the type of object
- */
-{
- BOOL Ret;
-
- DPRINT("Entering KeDispatcherObjectWake(hdr %x)\n",hdr);
-// DPRINT("hdr->WaitListHead %x hdr->WaitListHead.Flink %x\n",
-// &hdr->WaitListHead,hdr->WaitListHead.Flink);
- DPRINT("hdr->Type %x\n",hdr->Type);
- switch (hdr->Type)
- {
- case InternalNotificationEvent:
- return(KeDispatcherObjectWakeAll(hdr));
-
- case InternalNotificationTimer:
- return(KeDispatcherObjectWakeAll(hdr));
-
- case InternalSynchronizationEvent:
- return(KeDispatcherObjectWakeOne(hdr));
-
- case InternalSynchronizationTimer:
- return(KeDispatcherObjectWakeOne(hdr));
-
- case InternalSemaphoreType:
- DPRINT("hdr->SignalState %d\n", hdr->SignalState);
- if(hdr->SignalState>0)
- {
- do
- {
- DPRINT("Waking one semaphore waiter\n");
- Ret = KeDispatcherObjectWakeOne(hdr);
- } while(hdr->SignalState > 0 && Ret) ;
- return(Ret);
- }
- else return FALSE;
-
- case InternalProcessType:
- return(KeDispatcherObjectWakeAll(hdr));
-
- case InternalThreadType:
- return(KeDispatcherObjectWakeAll(hdr));
-
- case InternalMutexType:
- return(KeDispatcherObjectWakeOne(hdr));
- }
- DbgPrint("Dispatcher object %x has unknown type %d\n", hdr, hdr->Type);
- KeBugCheck(0);
- return(FALSE);
-}
+DontWait:
+ /* Adjust the Quantum */
+ KiAdjustQuantumThread(CurrentThread);
+ /* Release & Return */
+ KeReleaseDispatcherDatabaseLock(CurrentThread->WaitIrql);
+ return WaitStatus;
+}
-NTSTATUS STDCALL
-KeWaitForSingleObject(PVOID Object,
- KWAIT_REASON WaitReason,
- KPROCESSOR_MODE WaitMode,
- BOOLEAN Alertable,
- PLARGE_INTEGER Timeout)
/*
- * FUNCTION: Puts the current thread into a wait state until the
- * given dispatcher object is set to signalled
- * ARGUMENTS:
- * Object = Object to wait on
- * WaitReason = Reason for the wait (debugging aid)
- * WaitMode = Can be KernelMode or UserMode, if UserMode then
- * user-mode APCs can be delivered and the thread's
- * stack can be paged out
- * Altertable = Specifies if the wait is a alertable
- * Timeout = Optional timeout value
- * RETURNS: Status
+ * @implemented
*/
+NTSTATUS
+NTAPI
+KeWaitForMultipleObjects(IN ULONG Count,
+ IN PVOID Object[],
+ IN WAIT_TYPE WaitType,
+ IN KWAIT_REASON WaitReason,
+ IN KPROCESSOR_MODE WaitMode,
+ IN BOOLEAN Alertable,
+ IN PLARGE_INTEGER Timeout OPTIONAL,
+ OUT PKWAIT_BLOCK WaitBlockArray OPTIONAL)
{
- return KeWaitForMultipleObjects(1,
- &Object,
- WaitAny,
- WaitReason,
- WaitMode,
- Alertable,
- Timeout,
- NULL);
-}
+ PKMUTANT CurrentObject;
+ PKWAIT_BLOCK WaitBlock;
+ PKWAIT_BLOCK TimerWaitBlock;
+ PKTIMER ThreadTimer;
+ PKTHREAD CurrentThread = KeGetCurrentThread();
+ ULONG AllObjectsSignaled;
+ ULONG WaitIndex;
+ NTSTATUS WaitStatus = STATUS_SUCCESS;
+ BOOLEAN Swappable;
+ PLARGE_INTEGER OriginalDueTime = Timeout;
+ LARGE_INTEGER DueTime, NewDueTime;
+
+ /* Set the Current Thread */
+ CurrentThread = KeGetCurrentThread();
+
+ /* Check if the lock is already held */
+ if (CurrentThread->WaitNext)
+ {
+ /* Lock is held, disable Wait Next */
+ CurrentThread->WaitNext = FALSE;
+ }
+ else
+ {
+ /* Lock not held, acquire it */
+ CurrentThread->WaitIrql = KeAcquireDispatcherDatabaseLock();
+ }
+
+ /* Make sure the Wait Count is valid */
+ if (!WaitBlockArray)
+ {
+ /* Check in regards to the Thread Object Limit */
+ if (Count > THREAD_WAIT_OBJECTS)
+ {
+ /* Bugcheck */
+ KEBUGCHECK(MAXIMUM_WAIT_OBJECTS_EXCEEDED);
+ }
+
+ /* Use the Thread's Wait Block */
+ WaitBlockArray = &CurrentThread->WaitBlock[0];
+ }
+ else
+ {
+ /* Using our own Block Array, so check with the System Object Limit */
+ if (Count > MAXIMUM_WAIT_OBJECTS)
+ {
+ /* Bugcheck */
+ KEBUGCHECK(MAXIMUM_WAIT_OBJECTS_EXCEEDED);
+ }
+ }
+ /* Start the actual Loop */
+ do
+ {
+ /* Check if a kernel APC is pending and we're below APC_LEVEL */
+ if ((CurrentThread->ApcState.KernelApcPending) &&
+ !(CurrentThread->SpecialApcDisable) &&
+ (CurrentThread->WaitIrql < APC_LEVEL))
+ {
+ /* Unlock the dispatcher */
+ KeReleaseDispatcherDatabaseLock(CurrentThread->WaitIrql);
+ }
+ else
+ {
+ /* Append wait block to the KTHREAD wait block list */
+ CurrentThread->WaitBlockList = WaitBlock = WaitBlockArray;
+
+ /* Set default wait status */
+ CurrentThread->WaitStatus = STATUS_WAIT_0;
+
+ /* Check if the wait is (already) satisfied */
+ AllObjectsSignaled = TRUE;
+
+ /* First, we'll try to satisfy the wait directly */
+ for (WaitIndex = 0; WaitIndex < Count; WaitIndex++)
+ {
+ /* Get the Current Object */
+ CurrentObject = (PKMUTANT)Object[WaitIndex];
+
+ /* Check the type of wait */
+ if (WaitType == WaitAny)
+ {
+ /* Check if the Object is a mutant */
+ if (CurrentObject->Header.Type == MutantObject)
+ {
+ /* Check if it's signaled */
+ if ((CurrentObject->Header.SignalState > 0) ||
+ (CurrentThread == CurrentObject->OwnerThread))
+ {
+ /* This is a Wait Any, so unwait this and exit */
+ if (CurrentObject->Header.SignalState !=
+ (LONG)MINLONG)
+ {
+ /* Normal signal state, unwait it and return */
+ KiSatisfyMutantWait(CurrentObject,
+ CurrentThread);
+ WaitStatus = CurrentThread->WaitStatus |
+ WaitIndex;
+ goto DontWait;
+ }
+ else
+ {
+ /* Raise an exception (see wasm.ru) */
+ KeReleaseDispatcherDatabaseLock(CurrentThread->
+ WaitIrql);
+ ExRaiseStatus(STATUS_MUTANT_LIMIT_EXCEEDED);
+ }
+ }
+ }
+ else if (CurrentObject->Header.SignalState > 0)
+ {
+ /* Another signaled object, unwait and return */
+ KiSatisfyNonMutantWait(CurrentObject, CurrentThread);
+ WaitStatus = WaitIndex;
+ goto DontWait;
+ }
+ }
+ else
+ {
+ /* Check if we're dealing with a mutant again */
+ if (CurrentObject->Header.Type == MutantObject)
+ {
+ /* Check if it has an invalid count */
+ if ((CurrentThread == CurrentObject->OwnerThread) &&
+ (CurrentObject->Header.SignalState == MINLONG))
+ {
+ /* Raise an exception */
+ KeReleaseDispatcherDatabaseLock(CurrentThread->
+ WaitIrql);
+ ExRaiseStatus(STATUS_MUTANT_LIMIT_EXCEEDED);
+ }
+ else if ((CurrentObject->Header.SignalState <= 0) &&
+ (CurrentThread != CurrentObject->OwnerThread))
+ {
+ /* We don't own it, can't satisfy the wait */
+ AllObjectsSignaled = FALSE;
+ }
+ }
+ else if (CurrentObject->Header.SignalState <= 0)
+ {
+ /* Not signaled, can't satisfy */
+ AllObjectsSignaled = FALSE;
+ }
+ }
+
+ /* Set up a Wait Block for this Object */
+ WaitBlock->Object = CurrentObject;
+ WaitBlock->Thread = CurrentThread;
+ WaitBlock->WaitKey = (USHORT)WaitIndex;
+ WaitBlock->WaitType = (USHORT)WaitType;
+ WaitBlock->NextWaitBlock = WaitBlock + 1;
+
+ /* Move to the next Wait Block */
+ WaitBlock = WaitBlock->NextWaitBlock;
+ }
-NTSTATUS STDCALL
-KeWaitForMultipleObjects(ULONG Count,
- PVOID Object[],
- WAIT_TYPE WaitType,
- KWAIT_REASON WaitReason,
- KPROCESSOR_MODE WaitMode,
- BOOLEAN Alertable,
- PLARGE_INTEGER Timeout,
- PKWAIT_BLOCK WaitBlockArray)
-{
- DISPATCHER_HEADER *hdr;
- PKWAIT_BLOCK blk;
- PKTHREAD CurrentThread;
- ULONG CountSignaled;
- ULONG i;
- NTSTATUS Status;
- KIRQL WaitIrql;
- BOOLEAN Abandoned;
-
- DPRINT("Entering KeWaitForMultipleObjects(Count %lu Object[] %p) "
- "PsGetCurrentThread() %x\n", Count, Object, PsGetCurrentThread());
-
- CurrentThread = KeGetCurrentThread();
- WaitIrql = KeGetCurrentIrql();
-
- /*
- * Work out where we are going to put the wait blocks
- */
- if (WaitBlockArray == NULL)
- {
- if (Count > THREAD_WAIT_OBJECTS)
- {
- DPRINT("(%s:%d) Too many objects!\n", __FILE__, __LINE__);
- return (STATUS_UNSUCCESSFUL);
- }
- WaitBlockArray = &CurrentThread->WaitBlock[0];
- }
- else
- {
- if (Count > EX_MAXIMUM_WAIT_OBJECTS)
- {
- DPRINT("(%s:%d) Too many objects!\n", __FILE__, __LINE__);
- return (STATUS_UNSUCCESSFUL);
- }
- }
-
- /*
- * Set up the timeout if required
- */
- if (Timeout != NULL && Timeout->QuadPart != 0)
- {
- KeInitializeTimer(&CurrentThread->Timer);
- KeSetTimer(&CurrentThread->Timer, *Timeout, NULL);
- }
-
- do
- {
- KeAcquireDispatcherDatabaseLock(FALSE);
-
- /*
- * If we are going to wait alertably and a user apc is pending
- * then return
- */
- if (Alertable && KiTestAlert())
- {
- KeReleaseDispatcherDatabaseLock(FALSE);
- return (STATUS_USER_APC);
- }
-
- /*
- * Check if the wait is (already) satisfied
- */
- CountSignaled = 0;
- Abandoned = FALSE;
- for (i = 0; i < Count; i++)
- {
- hdr = (DISPATCHER_HEADER *) Object[i];
-
- if (KiIsObjectSignalled(hdr, CurrentThread))
- {
- CountSignaled++;
-
- if (WaitType == WaitAny)
+ /* Return to the Root Wait Block */
+ WaitBlock--;
+ WaitBlock->NextWaitBlock = WaitBlockArray;
+
+ /* Check if this is a Wait All and all the objects are signaled */
+ if ((WaitType == WaitAll) && (AllObjectsSignaled))
{
- Abandoned = KiSideEffectsBeforeWake(hdr, CurrentThread) ? TRUE : Abandoned;
+ /* Return to the Root Wait Block */
+ WaitBlock = CurrentThread->WaitBlockList;
- if (Timeout != NULL && Timeout->QuadPart != 0)
- {
- KeCancelTimer(&CurrentThread->Timer);
- }
+ /* Satisfy their Waits and return to the caller */
+ KiWaitSatisfyAll(WaitBlock);
+ WaitStatus = CurrentThread->WaitStatus;
+ goto DontWait;
+ }
- KeReleaseDispatcherDatabaseLock(FALSE);
+ /* Make sure we can satisfy the Alertable request */
+ KiCheckAlertability();
- DPRINT("One object is (already) signaled!\n");
- if (Abandoned == TRUE)
- {
- return (STATUS_ABANDONED_WAIT_0 + i);
- }
+ /* Check if we can swap the thread's stack */
+ CurrentThread->WaitListEntry.Flink = NULL;
+ KiCheckThreadStackSwap(WaitMode, CurrentThread, Swappable);
- return (STATUS_WAIT_0 + i);
- }
- }
- }
-
- Abandoned = FALSE;
- if ((WaitType == WaitAll) && (CountSignaled == Count))
- {
- for (i = 0; i < Count; i++)
- {
- hdr = (DISPATCHER_HEADER *) Object[i];
- Abandoned = KiSideEffectsBeforeWake(hdr, CurrentThread) ? TRUE : Abandoned;
- }
-
- if (Timeout != NULL && Timeout->QuadPart != 0)
- {
- KeCancelTimer(&CurrentThread->Timer);
- }
-
- KeReleaseDispatcherDatabaseLock(FALSE);
- DPRINT("All objects are (already) signaled!\n");
-
- if (Abandoned == TRUE)
- {
- return (STATUS_ABANDONED_WAIT_0);
- }
-
- return (STATUS_WAIT_0);
- }
-
- //zero timeout is used for testing if the object(s) can be immediately acquired
- if (Timeout != NULL && Timeout->QuadPart == 0)
- {
- KeReleaseDispatcherDatabaseLock(FALSE);
- return STATUS_TIMEOUT;
- }
-
- /*
- * Check if we have already timed out
- */
- if (Timeout != NULL && KiIsObjectSignalled(&CurrentThread->Timer.Header, CurrentThread))
- {
- KiSideEffectsBeforeWake(&CurrentThread->Timer.Header, CurrentThread);
- KeCancelTimer(&CurrentThread->Timer);
- KeReleaseDispatcherDatabaseLock(FALSE);
- return (STATUS_TIMEOUT);
- }
-
- /* Append wait block to the KTHREAD wait block list */
- CurrentThread->WaitBlockList = blk = WaitBlockArray;
-
- /*
- * Set up the wait
- */
- CurrentThread->WaitStatus = STATUS_UNSUCCESSFUL;
-
- for (i = 0; i < Count; i++)
- {
- hdr = (DISPATCHER_HEADER *) Object[i];
-
- blk->Object = Object[i];
- blk->Thread = CurrentThread;
- blk->WaitKey = STATUS_WAIT_0 + i;
- blk->WaitType = WaitType;
-
- if (i == (Count - 1))
- {
- if (Timeout != NULL)
+ /* Enable the Timeout Timer if there was any specified */
+ if (Timeout)
{
- blk->NextWaitBlock = &CurrentThread->WaitBlock[3];
+ /* Make sure the timeout interval isn't actually 0 */
+ if (!Timeout->QuadPart)
+ {
+ /* Return a timeout */
+ WaitStatus = STATUS_TIMEOUT;
+ goto DontWait;
+ }
+
+ /* Point to Timer Wait Block and Thread Timer */
+ TimerWaitBlock = &CurrentThread->WaitBlock[TIMER_WAIT_BLOCK];
+ ThreadTimer = &CurrentThread->Timer;
+
+ /* Connect the Timer Wait Block */
+ WaitBlock->NextWaitBlock = TimerWaitBlock;
+
+ /* Set up the Timer Wait Block */
+ TimerWaitBlock->NextWaitBlock = WaitBlockArray;
+
+ /* Initialize the list head */
+ InitializeListHead(&ThreadTimer->Header.WaitListHead);
+
+ /* Insert the Timer into the Timer Lists and enable it */
+ if (!KiInsertTimer(ThreadTimer, *Timeout))
+ {
+ /* Return a timeout if we couldn't insert the timer */
+ WaitStatus = STATUS_TIMEOUT;
+ goto DontWait;
+ }
+
+ /* Set the current due time */
+ DueTime.QuadPart = ThreadTimer->DueTime.QuadPart;
}
- else
+
+ /* Insert into Object's Wait List*/
+ WaitBlock = CurrentThread->WaitBlockList;
+ do
{
- blk->NextWaitBlock = NULL;
- }
- }
- else
- {
- blk->NextWaitBlock = blk + 1;
- }
-
- //add wait block to disp. obj. wait list
- InsertTailList(&hdr->WaitListHead, &blk->WaitListEntry);
-
- blk = blk->NextWaitBlock;
- }
-
- if (Timeout != NULL)
- {
- CurrentThread->WaitBlock[3].Object = (PVOID) & CurrentThread->Timer;
- CurrentThread->WaitBlock[3].Thread = CurrentThread;
- CurrentThread->WaitBlock[3].WaitKey = STATUS_TIMEOUT;
- CurrentThread->WaitBlock[3].WaitType = WaitAny;
- CurrentThread->WaitBlock[3].NextWaitBlock = NULL;
-
- InsertTailList(&CurrentThread->Timer.Header.WaitListHead,
- &CurrentThread->WaitBlock[3].WaitListEntry);
- }
-
- PsBlockThread(&Status, Alertable, WaitMode, TRUE, WaitIrql);
- }
- while (Status == STATUS_KERNEL_APC);
-
- if (Timeout != NULL)
- {
- KeCancelTimer(&CurrentThread->Timer);
- }
-
- DPRINT("Returning from KeWaitForMultipleObjects()\n");
- return (Status);
-}
+ /* Get the Current Object */
+ CurrentObject = WaitBlock->Object;
-VOID KeInitializeDispatcher(VOID)
-{
- KeInitializeSpinLock(&DispatcherDatabaseLock);
-}
+ /* Link the Object to this Wait Block */
+ InsertTailList(&CurrentObject->Header.WaitListHead,
+ &WaitBlock->WaitListEntry);
-NTSTATUS STDCALL
-NtWaitForMultipleObjects(IN ULONG Count,
- IN HANDLE Object [],
- IN WAIT_TYPE WaitType,
- IN BOOLEAN Alertable,
- IN PLARGE_INTEGER Time)
-{
- KWAIT_BLOCK WaitBlockArray[EX_MAXIMUM_WAIT_OBJECTS];
- PVOID ObjectPtrArray[EX_MAXIMUM_WAIT_OBJECTS];
- NTSTATUS Status;
- ULONG i, j;
- KPROCESSOR_MODE WaitMode;
-
- DPRINT("NtWaitForMultipleObjects(Count %lu Object[] %x, Alertable %d, "
- "Time %x)\n", Count,Object,Alertable,Time);
-
- if (Count > EX_MAXIMUM_WAIT_OBJECTS)
- return STATUS_UNSUCCESSFUL;
-
- WaitMode = ExGetPreviousMode();
-
- /* reference all objects */
- for (i = 0; i < Count; i++)
- {
- Status = ObReferenceObjectByHandle(Object[i],
- SYNCHRONIZE,
- NULL,
- WaitMode,
- &ObjectPtrArray[i],
- NULL);
- if (Status != STATUS_SUCCESS)
- {
- /* dereference all referenced objects */
- for (j = 0; j < i; j++)
- {
- ObDereferenceObject(ObjectPtrArray[j]);
- }
-
- return(Status);
- }
- }
-
- Status = KeWaitForMultipleObjects(Count,
- ObjectPtrArray,
- WaitType,
- UserRequest,
- WaitMode,
- Alertable,
- Time,
- WaitBlockArray);
-
- /* dereference all objects */
- for (i = 0; i < Count; i++)
- {
- ObDereferenceObject(ObjectPtrArray[i]);
- }
-
- return(Status);
-}
+ /* Move to the next Wait Block */
+ WaitBlock = WaitBlock->NextWaitBlock;
+ } while (WaitBlock != WaitBlockArray);
+ /* Handle Kernel Queues */
+ if (CurrentThread->Queue) KiWakeQueue(CurrentThread->Queue);
-NTSTATUS STDCALL
-NtWaitForSingleObject(IN HANDLE Object,
- IN BOOLEAN Alertable,
- IN PLARGE_INTEGER Time)
-{
- PVOID ObjectPtr;
- NTSTATUS Status;
- KPROCESSOR_MODE WaitMode;
-
- DPRINT("NtWaitForSingleObject(Object %x, Alertable %d, Time %x)\n",
- Object,Alertable,Time);
-
- WaitMode = ExGetPreviousMode();
-
- Status = ObReferenceObjectByHandle(Object,
- SYNCHRONIZE,
- NULL,
- WaitMode,
- &ObjectPtr,
- NULL);
- if (!NT_SUCCESS(Status))
- {
- return(Status);
- }
-
- Status = KeWaitForSingleObject(ObjectPtr,
- UserRequest,
- WaitMode,
- Alertable,
- Time);
-
- ObDereferenceObject(ObjectPtr);
-
- return(Status);
-}
+ /* Setup the wait information */
+ CurrentThread->Alertable = Alertable;
+ CurrentThread->WaitMode = WaitMode;
+ CurrentThread->WaitReason = WaitReason;
+ CurrentThread->WaitTime = ((PLARGE_INTEGER)&KeTickCount)->LowPart;
+ CurrentThread->State = Waiting;
+ /* Find a new thread to run */
+ KiAddThreadToWaitList(CurrentThread, Swappable);
+ WaitStatus = KiSwapThread();
+ ASSERT_IRQL_LESS_OR_EQUAL(DISPATCH_LEVEL);
-NTSTATUS STDCALL
-NtSignalAndWaitForSingleObject(IN HANDLE SignalObject,
- IN HANDLE WaitObject,
- IN BOOLEAN Alertable,
- IN PLARGE_INTEGER Time)
-{
- KPROCESSOR_MODE WaitMode;
- DISPATCHER_HEADER* hdr;
- PVOID SignalObj;
- PVOID WaitObj;
- NTSTATUS Status;
-
- WaitMode = ExGetPreviousMode();
- Status = ObReferenceObjectByHandle(SignalObject,
- 0,
- NULL,
- WaitMode,
- &SignalObj,
- NULL);
- if (!NT_SUCCESS(Status))
- {
- return Status;
- }
-
- Status = ObReferenceObjectByHandle(WaitObject,
- SYNCHRONIZE,
- NULL,
- WaitMode,
- &WaitObj,
- NULL);
- if (!NT_SUCCESS(Status))
- {
- ObDereferenceObject(SignalObj);
- return Status;
- }
-
- hdr = (DISPATCHER_HEADER *)SignalObj;
- switch (hdr->Type)
- {
- case InternalNotificationEvent:
- case InternalSynchronizationEvent:
- KeSetEvent(SignalObj,
- EVENT_INCREMENT,
- TRUE);
- break;
-
- case InternalMutexType:
- KeReleaseMutex(SignalObj,
- TRUE);
- break;
-
- case InternalSemaphoreType:
- KeReleaseSemaphore(SignalObj,
- SEMAPHORE_INCREMENT,
- 1,
- TRUE);
- break;
-
- default:
- ObDereferenceObject(SignalObj);
- ObDereferenceObject(WaitObj);
- return STATUS_OBJECT_TYPE_MISMATCH;
- }
-
- Status = KeWaitForSingleObject(WaitObj,
- UserRequest,
- WaitMode,
- Alertable,
- Time);
-
- ObDereferenceObject(SignalObj);
- ObDereferenceObject(WaitObj);
-
- return Status;
+ /* Check if we were executing an APC */
+ if (WaitStatus != STATUS_KERNEL_APC) return WaitStatus;
+
+ /* Check if we had a timeout */
+ if (Timeout)
+ {
+ /* Recalculate due times */
+ Timeout = KiRecalculateDueTime(OriginalDueTime,
+ &DueTime,
+ &NewDueTime);
+ }
+
+ /* Acquire again the lock */
+ CurrentThread->WaitIrql = KeAcquireDispatcherDatabaseLock();
+ }
+ } while (TRUE);
+
+ /* Release the Lock, we are done */
+ KeReleaseDispatcherDatabaseLock(CurrentThread->WaitIrql);
+ return WaitStatus;
+
+DontWait:
+ /* Adjust the Quantum */
+ KiAdjustQuantumThread(CurrentThread);
+
+ /* Release & Return */
+ KeReleaseDispatcherDatabaseLock(CurrentThread->WaitIrql);
+ return WaitStatus;
}
+
+/* EOF */
projects / reactos.git / blobdiff