author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 31 Aug 2010 16:17:46 +0300 | |
branch | RCL_3 |
changeset 93 | 79859ed3eea9 |
parent 91 | 30342f40acbf |
child 94 | 919f36ff910f |
permissions | -rw-r--r-- |
0
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/* |
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* Copyright (c) 2006 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of the License "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: |
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* |
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*/ |
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#ifndef _MEMORYMANAGER_H_ |
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#define _MEMORYMANAGER_H_ |
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|
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// INCLUDES |
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#include <e32std.h> |
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#include <e32base.h> |
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|
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// CONSTANTS |
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|
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// MACROS |
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// |
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|
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// DATA TYPES |
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enum TOOMCheckResult |
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{ |
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ENoOOM = 0x0000, // no oom |
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ECheckOOM = 0x0001, // last memory check failed |
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EUserAllocOOM = 0x0002, // system heap allocation failed |
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ERescueOOM = 0x0004, // rescue buffer allocation failed |
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ECollecting = 0x0010, // memory manager is collecting memory |
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EStopping = 0x0020 // memory menager is stopping operations |
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}; |
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|
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// simulate OOM, for debugging purpose |
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enum TOOMType |
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{ |
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EOOM_None = 0x0000, |
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EOOM_Heap1 = 0x0001, // fail the first heap allocation |
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EOOM_Heap2 = 0x0003, // fail the second heap allocation, after collection |
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EOOM_Rescue = 0x0007 // fail the rescue allocation |
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}; |
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|
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enum TOOMPriority |
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{ |
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EOOM_PriorityLow = 0, |
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EOOM_PriorityMiddle, |
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EOOM_PriorityHigh, |
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EOOM_PriorityCritical |
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}; |
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|
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// FUNCTION PROTOTYPES |
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// FORWARD DECLARATIONS |
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class CAllocator; |
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class FunctionLogger; |
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// CLASS DECLARATION |
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/** |
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* |
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* @lib memman.lib |
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* @since 3.1 |
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*/ |
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class MMemoryCollector |
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{ |
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public: // New functions |
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/** |
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* Collect free memory, this function is called when allocation from |
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* System heap fails |
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* @since 3.1 |
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* @param amount of memory needs to be collected |
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* @return amount of memory collected |
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*/ |
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virtual TUint Collect(TUint aRequired) = 0; |
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|
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/** |
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* restore the entity controlled memory collector when there is enough memory |
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* System heap fails |
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* @since 3.1 |
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* @param |
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* @return |
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*/ |
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virtual void Restore() = 0; |
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|
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/** |
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* Priority of this collector, 0 - lowest, 10 - highest; |
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* the lower the priority, the earlier this collector is executed. |
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* @since 3.1 |
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* @param |
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* @return |
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*/ |
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virtual TOOMPriority Priority() = 0; |
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}; |
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|
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/** |
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* |
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* @lib memman.lib |
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* @since 3.1 |
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*/ |
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class MOOMStopper |
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{ |
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public: // New functions |
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/** |
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* Stop currently on-going operations, called by the allocator |
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* @since 3.1 |
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* @param |
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* @return |
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*/ |
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virtual void Stop() = 0; |
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/** |
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* return the priority of this stopper (1-100), allocator expects this value |
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* to determine the stopping order. The higher the priority is, the sooner |
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* this stopper will be called. |
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* @since 3.1 |
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* @param |
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* @return |
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*/ |
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virtual TOOMPriority Priority() = 0; |
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}; |
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/** |
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* |
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* @lib memman.lib |
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* @since 3.1 |
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*/ |
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class MOOMNotifier |
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{ |
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public: // New functions |
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/** |
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* client provided notifying utility function, called by the allocator |
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* to inform the user |
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* @since 3.1 |
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* @param |
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* @return |
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*/ |
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virtual TInt Notify() = 0; |
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}; |
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/** |
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* A class handles all memory operations and OOM issues |
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* @lib memman.lib |
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* @since 3.1 |
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*/ |
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class MemoryManager |
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{ |
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public: |
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/** |
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* register a memory collector, memory manager doesn't own this collector |
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* @since 3.1 |
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* @param aCollector the collector to be registered |
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* @param |
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* @return |
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*/ |
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IMPORT_C static void AddCollector( MMemoryCollector* aCollector ); |
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|
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/** |
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* unregister a memory collector |
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* @since 3.1 |
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* @param aCollector the collector to be unregistered |
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* @param |
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* @return |
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*/ |
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IMPORT_C static void RemoveCollector( MMemoryCollector* aCollector ); |
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|
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/** |
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* register a stopper, memory manager doesn't own this stopper. |
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* @since 3.1 |
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* @param aStopper the stopper to be registered |
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* @param |
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* @return |
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*/ |
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IMPORT_C static void AddStopper( MOOMStopper* aStopper ); |
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|
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/** |
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* unregister a stopper |
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* @since 3.1 |
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* @param aStopper the stopper to be unregistered |
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* @param |
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* @return |
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*/ |
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IMPORT_C static void RemoveStopper( MOOMStopper* aStopper ); |
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|
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/** |
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* set the OOM notifier, memory manager doesn't own this notifier |
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* @since 3.1 |
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* @param aNotifier the notifier |
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* @param |
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* @return |
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*/ |
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IMPORT_C static void SetNotifier( MOOMNotifier* aNotifier ); |
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|
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/** |
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* check if the memory manager is able to reserve enough memory for the coming operation. |
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* @since 3.1 |
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* @param aTotalSize total amount of memory |
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* @param aMaxBufSizse the biggest contiguous memory buffer |
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* @param aChecker the name of operation |
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* @return result of prechecking, ETrue = successful |
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*/ |
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IMPORT_C static TBool PreCheck( TUint aTotalSize, TUint aMaxBufSize, const TDesC8& aChecker=KNullDesC8 ); |
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|
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/** |
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* An additional check after an operation is completed. |
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* @since 3.1 |
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* @param |
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* @param |
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* @return the status of memory during this operation. |
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*/ |
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IMPORT_C static TUint PostCheck(); |
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/** |
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* Get the status of memory manager, specific state could be retrieve by AND (&) operator |
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* with TOOMCheckResult enum |
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* @since 3.1 |
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* @param |
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* @param |
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* @return the status of memory during this operation. |
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*/ |
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IMPORT_C static TUint Status(); |
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/** |
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* Trigger an OOM event, this function is only for debugging purpose |
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* @since 3.1 |
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* @param aType defines where memory allocation fails |
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* @param |
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* @return |
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*/ |
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IMPORT_C static void SetStatus( TOOMCheckResult aType = ENoOOM ); |
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/** |
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* Prepare Memory manager for the coming application exit. |
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* @since 3.1 |
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* @param |
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* @param |
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* @return |
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*/ |
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IMPORT_C static void PrepareForExit(); |
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/** |
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* Free some RAM. Calls collect on registered collectors |
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* @since 3.1 |
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* @param |
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* @param |
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* @return |
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*/ |
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IMPORT_C static void FreeRam(); |
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/** |
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* Called when application is no longer in OOM situation. |
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* @since 3.1 |
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* @param |
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* @param |
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* @return |
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*/ |
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IMPORT_C static void RestoreCollectors(); |
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/** |
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* Called when application wants to change the rescue buffer size |
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* @since 3.1 |
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* @param |
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* @param |
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* @return |
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*/ |
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IMPORT_C static void SetRescueBufferSize(TInt aSize); |
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/** |
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* retrieve the size of an allocated memory cell |
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* @since 3.1 |
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* @param |
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* @param |
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* @return |
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*/ |
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IMPORT_C static TUint MemorySize(TAny* aPtr); |
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/** |
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* switch to the allocator using fast dlmalloc |
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* @since 3.1 |
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* @param |
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* @param |
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* @return |
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*/ |
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IMPORT_C static RAllocator* SwitchToFastAllocator(); |
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/** |
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* switch to the default allocator provided by Symbian OS, |
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* and close the current fast allocator. |
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* @since 3.1 |
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* @param |
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* @param |
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* @return |
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*/ |
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IMPORT_C static void CloseFastAllocator(RAllocator* aDefaultAllocator); |
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}; |
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#endif// !_MEMORYMANAGER_H_ |