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1 // Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // @file |
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15 // @internalComponent |
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16 // |
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17 // |
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18 |
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19 #include <e32base.h> |
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20 #include "cchunkmanager.h" |
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21 #include "rmemcell.h" |
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22 #include "cmemchunk.h" |
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23 #include "rchunkpool.h" |
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24 |
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25 |
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26 RChunkPool::RChunkPool ( TInt aBlockSize, TInt aThresholdValue, TInt aMinGrowth, CChunkManager& aChunkManager ) |
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27 : iBlockSize ( aBlockSize ), |
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28 iChunkManager ( aChunkManager ), |
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29 iThresholdValue ( aThresholdValue ), |
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30 iMinGrowth ( aMinGrowth ) |
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31 { |
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32 iFreeBlocks.Init (); |
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33 iFreeSpace = 0; |
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34 } |
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35 |
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36 RChunkPool::RChunkPool ( CChunkManager& aChunkManager, TInt aBlockSize ) |
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37 : iBlockSize ( aBlockSize ), |
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38 iChunkManager ( aChunkManager ) |
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39 { |
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40 } |
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41 |
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42 void RChunkPool::OpenL () |
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43 { |
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44 User::LeaveIfError ( iFreeListLock.CreateLocal () ); |
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45 } |
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46 |
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47 void RChunkPool::Close () |
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48 { |
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49 iFreeListLock.Close (); |
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50 iAllocatedChunks.Close (); |
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51 } |
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52 |
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53 TInt RChunkPool::Compare ( const RChunkPool& aLHSPool, const RChunkPool& aRHSPool ) |
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54 { |
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55 if ( aLHSPool.BlockSize () < aRHSPool.BlockSize () ) |
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56 { |
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57 return -1; |
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58 } |
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59 else if ( aLHSPool.BlockSize () > aRHSPool.BlockSize () ) |
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60 { |
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61 return 1; |
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62 } |
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63 return 0; |
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64 } |
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65 |
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66 void RChunkPool::AppendToFreeList ( CMemChunk* aChunk ) |
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67 { |
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68 iFreeSpace += iBlockSize * aChunk->NumBlocks (); |
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69 iFreeBlocks.Append ( aChunk->List () ); |
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70 } |
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71 |
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72 |
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73 // transfer's blocks from free list and makes self growth if necessary |
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74 TInt RChunkPool::Alloc ( RMemCellList& aList, TInt aSize ) |
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75 { |
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76 // Lock the freelist so that |
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77 // Transfer of free blocks will be an atomic operation |
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78 iFreeListLock.Wait (); |
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79 |
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80 TInt bytesTransfered = iFreeBlocks.Transfer ( aList, aSize ); |
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81 iFreeSpace -= bytesTransfered; |
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82 |
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83 TInt freeHeapSpace = iChunkManager.BytesAvailable (); |
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84 |
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85 if ( freeHeapSpace ) // makes sure that heap has memory atleast for CMemChunk object, but not for its chunk |
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86 { |
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87 // check if freeblocks is down the threshold value and make self growth if necessary |
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88 // determine min number of blocks to allocate |
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89 TInt minGrowth = iThresholdValue - ( iFreeSpace / iBlockSize ); |
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90 |
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91 if ( minGrowth >= 0 ) |
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92 { |
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93 if ( GrowPool ( iMinGrowth ) == KErrNoMemory ) |
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94 { |
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95 // unable to grow the minimum value set by the client |
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96 if ( minGrowth < iMinGrowth ) |
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97 { |
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98 // so, now try with the min value adjusted with threshold value |
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99 GrowPool ( minGrowth ); |
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100 } |
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101 } |
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102 } |
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103 } |
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104 |
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105 // free the freelistlock |
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106 iFreeListLock.Signal (); |
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107 |
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108 return bytesTransfered; |
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109 } |
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110 |
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111 TInt RChunkPool::GrowPool ( TUint aNumBlocks ) |
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112 { |
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113 return iChunkManager.AllocChunk ( *this, aNumBlocks ); |
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114 } |
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115 |
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116 TInt RChunkPool::GrowAndAlloc ( RMemCellList& aList, TInt aSize, TInt aNumBlocks ) |
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117 { |
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118 // Lock the freelist so that |
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119 // Transfer of free blocks will be an atomic operation |
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120 TInt bytesTransfered = 0; |
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121 iFreeListLock.Wait (); |
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122 |
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123 if ( GrowPool ( aNumBlocks ) != KErrNoMemory ) |
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124 { |
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125 bytesTransfered = iFreeBlocks.Transfer ( aList, aSize ); |
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126 iFreeSpace -= bytesTransfered; |
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127 } |
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128 |
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129 // free the freelistlock |
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130 iFreeListLock.Signal (); |
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131 |
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132 return bytesTransfered; |
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133 } |
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134 |
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135 void RChunkPool::FreeToPool ( RMemCell* aMemCell ) |
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136 { |
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137 iFreeBlocks.Append ( aMemCell ); |
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138 iFreeSpace += aMemCell->Size (); |
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139 } |
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140 |
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141 |