[hbirr] 16754: Acquire always the apc lock if we are modifying the apc queue.

Acquire always the apc lock if we are modifying the apc queue.
Modified: trunk/reactos/ntoskrnl/ke/apc.c
Modified: trunk/reactos/ntoskrnl/ke/process.c
  _____

Modified: trunk/reactos/ntoskrnl/ke/apc.c
--- trunk/reactos/ntoskrnl/ke/apc.c	2005-07-26 19:15:08 UTC (rev
16753)
+++ trunk/reactos/ntoskrnl/ke/apc.c	2005-07-26 19:21:27 UTC (rev
16754)
@@ -245,7 +245,7 @@

*     The APC will execute at APC_LEVEL for the KernelRoutine
registered, and
  *     at PASSIVE_LEVEL for the NormalRoutine registered.
  *
- *     Callers of this routine must be running at IRQL = PASSIVE_LEVEL.
+ *     Callers of this routine must have locked the dipatcher database.
  *
  *--*/
 BOOLEAN
@@ -257,9 +257,12 @@
     PLIST_ENTRY ApcListEntry;
     PKAPC QueuedApc;

+    KeAcquireSpinLockAtDpcLevel(&Thread->ApcQueueLock);
+
     /* Don't do anything if the APC is already inserted */
     if (Apc->Inserted) {
-
+    
+        KeReleaseSpinLockFromDpcLevel(&Thread->ApcQueueLock);
         return FALSE;
     }

@@ -301,6 +304,8 @@
     /* Confirm Insertion */
     Apc->Inserted = TRUE;

+    KeReleaseSpinLockFromDpcLevel(&Thread->ApcQueueLock);
+
     /*
      * Three possibilites here again:
      *  1) Kernel APC, The thread is Running: Request an Interrupt
@@ -318,13 +323,11 @@
 #ifdef CONFIG_SMP
             PKPRCB Prcb, CurrentPrcb;
             LONG i;
-            KIRQL oldIrql;
 #endif

DPRINT ("Requesting APC Interrupt for Running Thread \n");

#ifdef CONFIG_SMP
-            oldIrql = KeRaiseIrqlToDpcLevel();
             CurrentPrcb = KeGetCurrentPrcb();
             if (CurrentPrcb->CurrentThread == Thread)
             {
@@ -344,7 +347,6 @@
                }
                ASSERT (i < KeNumberProcessors);
             }
-            KeLowerIrql(oldIrql);
 #else
             HalRequestSoftwareInterrupt(APC_LEVEL);
 #endif
  _____

Modified: trunk/reactos/ntoskrnl/ke/process.c
--- trunk/reactos/ntoskrnl/ke/process.c	2005-07-26 19:15:08 UTC (rev
16753)
+++ trunk/reactos/ntoskrnl/ke/process.c	2005-07-26 19:21:27 UTC (rev
16754)
@@ -89,6 +89,7 @@

/* Initialize the Thread List */
     InitializeListHead(&Process->ThreadListHead);
+    KeInitializeSpinLock(&Process->ProcessLock);
     DPRINT("The Process has now been initalized with the Kernel\n");
 }

@@ -138,6 +139,7 @@

/* Lock Dispatcher */
     OldIrql = KeAcquireDispatcherDatabaseLock();
+    KeAcquireSpinLockAtDpcLevel(&Thread->ApcQueueLock);

/* Crash system if DPC is being executed! */
     if (KeIsExecutingDpc()) {
@@ -150,6 +152,7 @@
     if (Thread->ApcState.Process == Process || Thread->ApcStateIndex !=
OriginalApcEnvironment) {

DPRINT("Process already Attached. Exitting\n");
+        KeReleaseSpinLockFromDpcLevel(&Thread->ApcQueueLock);
         KeReleaseDispatcherDatabaseLock(OldIrql);
     } else {

@@ -191,6 +194,7 @@
     KiSwapProcess(Process, SavedApcState->Process);

/* Return to old IRQL*/
+    KeReleaseSpinLockFromDpcLevel(&Thread->ApcQueueLock);
     KeReleaseDispatcherDatabaseLock(ApcLock);

DPRINT("KiAttachProcess Completed Sucesfully\n");
@@ -232,6 +236,7 @@
     UpdatePageDirs(Thread, Process);

OldIrql = KeAcquireDispatcherDatabaseLock();
+    KeAcquireSpinLockAtDpcLevel(&Thread->ApcQueueLock);

/* Crash system if DPC is being executed! */
     if (KeIsExecutingDpc()) {
@@ -273,6 +278,7 @@
     /* Get Current Thread and Lock */
     Thread = KeGetCurrentThread();
     OldIrql = KeAcquireDispatcherDatabaseLock();
+    KeAcquireSpinLockAtDpcLevel(&Thread->ApcQueueLock);

/* Check if it's attached */
     DPRINT("Current ApcStateIndex: %x\n", Thread->ApcStateIndex);
@@ -297,6 +303,7 @@
     KiSwapProcess(Thread->ApcState.Process, Thread->ApcState.Process);

/* Unlock Dispatcher */
+    KeReleaseSpinLockFromDpcLevel(&Thread->ApcQueueLock);
     KeReleaseDispatcherDatabaseLock(OldIrql);
 }

@@ -320,6 +327,7 @@

Thread = KeGetCurrentThread();
     OldIrql = KeAcquireDispatcherDatabaseLock();
+    KeAcquireSpinLockAtDpcLevel(&Thread->ApcQueueLock);

/* Sorry Buddy, can't help you if you've got APCs or just aren't
attached */
     if ((Thread->ApcStateIndex == OriginalApcEnvironment) ||
(Thread->ApcState.KernelApcInProgress)) {
@@ -347,6 +355,7 @@
     KiSwapProcess(Thread->ApcState.Process, Thread->ApcState.Process);

/* Return to old IRQL*/
+    KeReleaseSpinLockFromDpcLevel(&Thread->ApcQueueLock);
     KeReleaseDispatcherDatabaseLock(OldIrql);
 }