[hbelusca] 68589: [NTVDM]: Use the while() construct for looping into doubly-linked lists where we can remove items from it in the middle of the loop code.

Author: hbelusca
Date: Sat Aug  1 18:56:44 2015
New Revision: 68589

URL: http://svn.reactos.org/svn/reactos?rev=68589&view=rev
Log:
[NTVDM]: Use the while() construct for looping into doubly-linked lists where we can
remove items from it in the middle of the loop code.

Modified:
    trunk/reactos/subsystems/mvdm/ntvdm/bios/umamgr.c
    trunk/reactos/subsystems/mvdm/ntvdm/clock.c
    trunk/reactos/subsystems/mvdm/ntvdm/clock.h

Modified: trunk/reactos/subsystems/mvdm/ntvdm/bios/umamgr.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/mvdm/ntvdm/bios…
==============================================================================
--- trunk/reactos/subsystems/mvdm/ntvdm/bios/umamgr.c	[iso-8859-1] (original)
+++ trunk/reactos/subsystems/mvdm/ntvdm/bios/umamgr.c	[iso-8859-1] Sat Aug  1 18:56:44
2015
@@ -91,11 +91,11 @@
     // FIXME: Check! What to do?
     if (RequestSize == 0) DPRINT1("Requesting UMA descriptor with null
size?!\n");
 
-    for (Entry = UmaDescriptorList.Flink;
-         Entry != &UmaDescriptorList;
-         Entry = Entry->Flink)
+    Entry = UmaDescriptorList.Flink;
+    while (Entry != &UmaDescriptorList)
     {
         UmaDesc = (PUMA_DESCRIPTOR)CONTAINING_RECORD(Entry, UMA_DESCRIPTOR, Entry);
+        Entry = Entry->Flink;
 
         /* Only check free descriptors */
         if (UmaDesc->Type != UMA_FREE) continue;
@@ -209,11 +209,11 @@
     PUMA_DESCRIPTOR UmaDesc, PrevDesc = NULL, NextDesc = NULL;
     PUMA_DESCRIPTOR FoundUmaDesc = NULL;
 
-    for (Entry = UmaDescriptorList.Flink;
-         Entry != &UmaDescriptorList;
-         Entry = Entry->Flink)
+    Entry = UmaDescriptorList.Flink;
+    while (Entry != &UmaDescriptorList)
     {
         UmaDesc = (PUMA_DESCRIPTOR)CONTAINING_RECORD(Entry, UMA_DESCRIPTOR, Entry);
+        Entry = Entry->Flink;
 
         /* Search for the descriptor in the list */
         if (UmaDesc->Start == Address && UmaDesc->Type == UMA_UMB)
@@ -267,11 +267,11 @@
     // FIXME: Check! What to do?
     if (RequestSize == 0) DPRINT1("Resizing UMA descriptor %04X to null
size?!\n", Segment);
 
-    for (Entry = UmaDescriptorList.Flink;
-         Entry != &UmaDescriptorList;
-         Entry = Entry->Flink)
+    Entry = UmaDescriptorList.Flink;
+    while (Entry != &UmaDescriptorList)
     {
         UmaDesc = (PUMA_DESCRIPTOR)CONTAINING_RECORD(Entry, UMA_DESCRIPTOR, Entry);
+        Entry = Entry->Flink;
 
         /* Only get the maximum size of free descriptors */
         if (UmaDesc->Type == UMA_FREE)

Modified: trunk/reactos/subsystems/mvdm/ntvdm/clock.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/mvdm/ntvdm/cloc…
==============================================================================
--- trunk/reactos/subsystems/mvdm/ntvdm/clock.c	[iso-8859-1] (original)
+++ trunk/reactos/subsystems/mvdm/ntvdm/clock.c	[iso-8859-1] Sat Aug  1 18:56:44 2015
@@ -65,6 +65,7 @@
     extern BOOLEAN CpuRunning;
     UINT i;
     PLIST_ENTRY Entry;
+    PHARDWARE_TIMER Timer;
 
     while (VdmRunning && CpuRunning)
     {
@@ -81,10 +82,13 @@
             ++Cycles;
         }
 
-        for (Entry = Timers.Flink; Entry != &Timers; Entry = Entry->Flink)
+        Entry = Timers.Flink;
+        while (Entry != &Timers)
         {
             ULONGLONG Ticks = (ULONGLONG)-1;
-            PHARDWARE_TIMER Timer = CONTAINING_RECORD(Entry, HARDWARE_TIMER, Link);
+
+            Timer = CONTAINING_RECORD(Entry, HARDWARE_TIMER, Link);
+            Entry = Entry->Flink;
 
             ASSERT((Timer->EnableCount > 0) && (Timer->Flags &
HARDWARE_TIMER_ENABLED));
 
@@ -128,12 +132,13 @@
 {
     PHARDWARE_TIMER Timer;
 
-    Timer = RtlAllocateHeap(RtlGetProcessHeap(), 0, sizeof(*Timer));
+    Timer = RtlAllocateHeap(RtlGetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(*Timer));
     if (Timer == NULL) return NULL;
 
     Timer->Flags = Flags & ~HARDWARE_TIMER_ENABLED;
     Timer->EnableCount = 0;
     Timer->Callback = Callback;
+    Timer->LastTick.QuadPart = 0;
     SetHardwareTimerDelay(Timer, Delay);
 
     if (Flags & HARDWARE_TIMER_ENABLED) EnableHardwareTimer(Timer);

Modified: trunk/reactos/subsystems/mvdm/ntvdm/clock.h
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/mvdm/ntvdm/cloc…
==============================================================================
--- trunk/reactos/subsystems/mvdm/ntvdm/clock.h	[iso-8859-1] (original)
+++ trunk/reactos/subsystems/mvdm/ntvdm/clock.h	[iso-8859-1] Sat Aug  1 18:56:44 2015
@@ -27,8 +27,8 @@
     ULONG Flags;
     LONG EnableCount;
     ULONGLONG Delay;
+    LARGE_INTEGER LastTick;
     PHARDWARE_TIMER_PROC Callback;
-    LARGE_INTEGER LastTick;
 } HARDWARE_TIMER, *PHARDWARE_TIMER;
 
 /* FUNCTIONS ******************************************************************/