diff -r a179b74831c9 -r c1f20ce4abcf kernel/eka/include/drivers/resource.h
--- a/kernel/eka/include/drivers/resource.h	Thu Aug 19 11:14:22 2010 +0300
+++ b/kernel/eka/include/drivers/resource.h	Tue Aug 31 16:34:26 2010 +0300
@@ -1,4 +1,4 @@
-// Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).
+// Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies).
 // All rights reserved.
 // This component and the accompanying materials are made available
 // under the terms of the License "Eclipse Public License v1.0"
@@ -12,7 +12,7 @@
 //
 // Description:
 // e32\include\drivers\resource.h
-// 
+//
 // WARNING: This file contains some APIs which are internal and are subject
 //          to change without notice. Such APIs should therefore not be used
 //          outside the Kernel and Hardware Services package.
@@ -26,18 +26,18 @@
 #include <drivers/resource_category.h>
 
 //Definition for resource flag setting. Used by PSL.
-static const TUint KTypeMask= 0x3;
-static const TUint KUsageOffset=0x1F;
-static const TUint KLongLatencySetOffset=0x1E;
-static const TUint KLongLatencyGetOffset=0x1D;
-static const TUint KClassOffset=0x1C;
-static const TUint KSenseOffset=0x1A;
-static const TUint KShared=0x1<<KUsageOffset;
-static const TUint KLongLatencySet=0x1<<KLongLatencySetOffset;
-static const TUint KLongLatencyGet=0x1<<KLongLatencyGetOffset;
-static const TUint KLogical=0x1<<KClassOffset;
-static const TUint KSenseNegative=0x01<<KSenseOffset;
-static const TUint KSenseCustom=0x2<<KSenseOffset;
+const TUint KTypeMask             = 0x3;
+const TUint KUsageOffset          = 0x1F;
+const TUint KLongLatencySetOffset = 0x1E;
+const TUint KLongLatencyGetOffset = 0x1D;
+const TUint KClassOffset          = 0x1C;
+const TUint KSenseOffset          = 0x1A;
+const TUint KShared               = 0x1u << KUsageOffset;
+const TUint KLongLatencySet       = 0x1u << KLongLatencySetOffset;
+const TUint KLongLatencyGet       = 0x1u << KLongLatencyGetOffset;
+const TUint KLogical              = 0x1u << KClassOffset;
+const TUint KSenseNegative        = 0x1u << KSenseOffset;
+const TUint KSenseCustom          = 0x2u << KSenseOffset;
 
 struct TPowerRequest;
 struct SIdleResourceInfo;
@@ -149,7 +149,7 @@
 /**
 @publishedPartner
 @prototype 9.5
-An object of this type prepresents a customised Dfc
+An object of this type represents a customized Dfc
 used to signal completion of the resource manager's asynchronous APIs
 and completion of notifications
 @see TPowerResourceManager
@@ -168,19 +168,48 @@
 	    __KTRACE_OPT(KRESMANAGER, Kern::Printf(">TPowerResourceCb::DfcFunc ClientId = 0x%x, ResourceId = %d, Level = %d, \
 			                    LevelOwnerId = %d, Result = %d", pCb->iClientId, pCb->iResourceId, pCb->iLevel, \
 								pCb->iLevelOwnerId, pCb->iResult));
-	    // Call the client specified callback function
-        pCb->iCallback(pCb->iClientId, pCb->iResourceId, pCb->iLevel, pCb->iLevelOwnerId, pCb->iResult, pCb->iParam);
-		pCb->iResult = KErrCompletion; //Mark the callback object to act properly during cancellation of this request.
+
+        pCb->Lock();
+        TUint ClientId = pCb->iClientId;
+        TUint ResourceId = pCb->iResourceId;
+        TInt Level = pCb->iLevel;
+        TInt LevelOwnerId = pCb->iLevelOwnerId;
+        TInt Result = pCb->iResult;
+        TAny* Param = pCb->iParam;
+        pCb->UnLock();
+
+        // Call the client specified callback function
+        pCb->iCallback(ClientId, ResourceId, Level, LevelOwnerId, Result, Param);    
+
+        pCb->Lock();
+        pCb->iPendingRequestCount--;
+        if(pCb->iPendingRequestCount == 0)
+            pCb->iResult = KErrCompletion; //Mark the callback object to act properly during cancellation of this request.
+        pCb->UnLock();
         PRM_CALLBACK_COMPLETION_TRACE
         }
 private:
+    void Lock()
+        {
+		__ASSERT_DEBUG(iMutex, Kern::Fault("TPowerResourceCb::Lock", __LINE__));
+        NKern::ThreadEnterCS();
+        Kern::MutexWait(*iMutex);
+        }
+    void UnLock()
+        {
+		__ASSERT_DEBUG(iMutex, Kern::Fault("TPowerResourceCb::UnLock", __LINE__));
+        Kern::MutexSignal(*iMutex);
+        NKern::ThreadLeaveCS();
+        }
     TAny* iParam; //Stores the aPtr argument passed in the constructor, to be passed as 5th argument to the callback function
-    TInt iResult; //Used to store the result aswell as binary usage count for the callback
+    TInt iResult; //Used to store the result as well as binary usage count for the callback
     TInt iLevel; // Level of the resource
 	TInt iLevelOwnerId; // Stores owner of the resource for asynchronous get operation
     TUint iResourceId; //Stores the ID of the resource whose state is changed/read asynchronously
     TUint iClientId; //Stores the ID of the client that requested the asynchronous operation
     TPowerResourceCbFn iCallback; //Callback function object
+	DMutex* iMutex;   
+    TInt iPendingRequestCount;
 #ifdef PRM_CONTROLLER
     friend class DPowerResourceController;
 #endif