kernel/eka/include/e32shbufcmn.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 31 Aug 2010 16:34:26 +0300
branchRCL_3
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permissions -rw-r--r--
Revision: 201035 Kit: 201035
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// Copyright (c) 2009 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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// e32/include/e32shbufcmn.h
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// Shareable Data Buffers
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/**
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	@file
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	@publishedPartner
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	@prototype
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*/
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#ifndef E32SHBUFCMN_H
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#define E32SHBUFCMN_H
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#include <e32shbuf_priv.h>
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#include <e32def.h>
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/**
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	Defines values used to modify client behaviour when opening a pool or buffer in a new process.
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	@publishedPartner
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	@prototype
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*/
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enum TShPoolHandleFlags
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	{
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	/**
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	The buffers will be writeable in the process where this handle is used.
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	If not set, the buffers will be read-only.
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	*/
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	EShPoolWriteable		= 0x0001,
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	/**
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	The process will be able to allocate buffers from this pool.
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	If not set, the process will not be able to allocate buffers from this pool.
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	*/
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	EShPoolAllocate			= 0x0002,
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	};
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/**
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	Defines flags for RShBuf::Alloc() and DShPool::Alloc().
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	@see RShBuf::Alloc()
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	@see DShPool::Alloc()
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	@publishedPartner
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	@prototype
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*/
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enum TShPoolAllocFlags
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	{
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	/**
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	The thread is willing to wait for a pool grow if no buffer is immediately available.
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	If this is not set, the Alloc() will return immediately if no free buffer is available,
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	but the pool might be able to grow to create new buffers.
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	*/
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	EShPoolAllocCanWait = 0x0001,
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	/**
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	Do not automatically map the newly-allocated buffer into this process, if the pool is page-aligned.
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	(RShBuf::Alloc() only.)
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	*/
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	EShPoolAllocNoMap = 0x0002,
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	};
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/**
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	Defines the attributes of a pool.
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	@publishedPartner
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	@prototype
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*/
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class TShPoolInfo
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	{
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public:
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	IMPORT_C TShPoolInfo();
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	/**
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	Specifies the size of each buffer in the pool.
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	*/
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	TUint iBufSize;
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	/**
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	Specifies the initial number of buffers to be allocated to the pool.
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	*/
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	TUint iInitialBufs;
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	/**
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	Specifies the maximum number of buffers the pool can grow to.
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	*/
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	TUint iMaxBufs;
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	/**
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	This specifies when the pool grows.  If zero, the pool will not grow or shrink
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	automatically.
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	This is the proportion of free buffers left in the pool at which it should be grown.
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	For example, if the ratio is 0.1, the pool will be grown when the number of free
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	buffers drops to 10%.
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	This value is expressed as a 32-bit fixed-point number, where the binary
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	point is defined to be between bits 7 and 8 (where the least-significant
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	bit is defined as bit 0).  (This format is also known as a Q8, or fx24.8
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	number, or alternatively as the value * 256.)  For the example given of 10%,
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	use the value 26.  It represents a value < 1 (i.e. must be < 256).  Calculations
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	are rounded down towards zero, but if calculating how many buffers to trigger
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	on gives 0, the grow will be triggered when 1 buffer is free.
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	*/
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	TUint iGrowTriggerRatio;
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	/**
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	This specifies the proportion by which to grow the pool each time it is grown.
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	If zero, the pool will not grow or shrink automatically.
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	It is expressed as a 32-bit fx24.8 fixed-point number, in the same way as
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	iGrowTriggerRatio.  Calculations are rounded down towards zero, but if calculating
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	how many buffers to grow by yields 0, then the pool will be grown by 1 buffer.
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	*/
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	TUint iGrowByRatio;
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	/**
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	The hysteresis value to ensure that the pool does not automatically shrink
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	immediately after is grows.
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	Automatic shrinking will only happen when there are (iGrowTriggerRatio +
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	iGrowByRatio) * iShrinkHysteresisRatio * (total buffers in the pool) free
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	buffers left in the pool.
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	The amount by which the pool is shrunk depends on iGrowByRatio: it is the operational
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	inverse, such that the pool would shrink down to the same number of buffers if shrunk
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	immediately after growing (although hysteresis normally prevents this).
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	For example, if iGrowByRatio is 10%, a pool of 100 buffers would grow to 110 buffers.
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	To shrink back to 100, a shrink ratio of 10/110 = 9% is required.  That is, if the
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	grow-by ration is G, the shrink-by ratio S is calculated as S = 1 - 1 / (1 + G).
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	iShrinkHysteresisRatio is a 32-bit fx24.8 fixed-point number in the same way as
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	iGrowTriggerRatio and iGrowByRatio.  It represents a value > 1 (i.e. must be > 256).
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	@see iGrowByRatio
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	*/
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	TUint iShrinkHysteresisRatio;
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	/**
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	Specifies the alignment for each buffer, as a shift count (log2 bytes).
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	For example, 9 means that each buffer is aligned on a 512-byte boundary.
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	*/
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	TUint iAlignment;
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	/**
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	Specifies flags for the pool, as bit values from TShPoolCreateFlags or-ed together.
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	@see TShPoolCreateFlags
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	*/
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	TUint iFlags;
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private:
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	TInt iSpare1;			// Reserved for future use
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	TInt iSpare2;
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	TInt iSpare3;
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	TInt iSpare4;
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	};
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#endif	// E32SHBUF_H
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