only attach to the process to be queried when necessary

Modified: trunk/reactos/ntoskrnl/ke/spinlock.c
Modified: trunk/reactos/ntoskrnl/ps/process.c

--- trunk/reactos/ntoskrnl/ke/spinlock.c	2005-02-05 10:19:49 UTC (rev 13420)
+++ trunk/reactos/ntoskrnl/ke/spinlock.c	2005-02-05 10:31:37 UTC (rev 13421)
@@ -195,9 +195,7 @@

 			  :
                           : "r" (SpinLock));
 #else	                  

-    while (0 != *(volatile PKSPIN_LOCK)SpinLock)
-    {
-    }

+    while (0 != *(volatile KSPIN_LOCK*)SpinLock);

 #endif
 #else
     DbgPrint("Spinning on spinlock %x current value %x\n", SpinLock, i);

--- trunk/reactos/ntoskrnl/ps/process.c	2005-02-05 10:19:49 UTC (rev 13420)
+++ trunk/reactos/ntoskrnl/ps/process.c	2005-02-05 10:31:37 UTC (rev 13421)
@@ -1613,11 +1613,15 @@

         {
           PRTL_USER_PROCESS_PARAMETERS ProcParams = NULL;
           UNICODE_STRING LocalDest;

+          BOOLEAN Attached;

           ULONG ImagePathLen = 0;
           PUNICODE_STRING DstPath = (PUNICODE_STRING)ProcessInformation;
 
           /* we need to attach to the process to make sure we're in the right context! */

-          KeAttachProcess(&Process->Pcb);

+          Attached = Process != PsGetCurrentProcess();
+
+          if(Attached)
+            KeAttachProcess(&Process->Pcb);

           
           _SEH_TRY
           {
@@ -1677,7 +1681,8 @@

                   _SEH_END;
 
                   /* detach from the process */

-                  KeDetachProcess();

+                  if(Attached)
+                    KeDetachProcess();

 
                   /* only copy the string back to the caller if we were able to
                      copy it into the temporary buffer! */
@@ -1715,7 +1720,8 @@

           }
           
           /* don't forget to detach from the process!!! */

-          KeDetachProcess();

+          if(Attached)
+            KeDetachProcess();

         }
         else
         {