1 | // |
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2 | // MemoryPool.cpp |
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3 | // |
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4 | // $Id: //poco/1.3/Foundation/src/MemoryPool.cpp#2 $ |
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5 | // |
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6 | // Library: Foundation |
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7 | // Package: Core |
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8 | // Module: MemoryPool |
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9 | // |
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10 | // Copyright (c) 2005-2006, Applied Informatics Software Engineering GmbH. |
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11 | // and Contributors. |
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12 | // |
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13 | // Permission is hereby granted, free of charge, to any person or organization |
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14 | // obtaining a copy of the software and accompanying documentation covered by |
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15 | // this license (the "Software") to use, reproduce, display, distribute, |
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16 | // execute, and transmit the Software, and to prepare derivative works of the |
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17 | // Software, and to permit third-parties to whom the Software is furnished to |
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18 | // do so, all subject to the following: |
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19 | // |
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20 | // The copyright notices in the Software and this entire statement, including |
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21 | // the above license grant, this restriction and the following disclaimer, |
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22 | // must be included in all copies of the Software, in whole or in part, and |
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23 | // all derivative works of the Software, unless such copies or derivative |
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24 | // works are solely in the form of machine-executable object code generated by |
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25 | // a source language processor. |
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26 | // |
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27 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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28 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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29 | // FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT |
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30 | // SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE |
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31 | // FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, |
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32 | // ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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33 | // DEALINGS IN THE SOFTWARE. |
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34 | // |
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35 | |
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36 | |
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37 | #include "Poco/MemoryPool.h" |
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38 | #include "Poco/Exception.h" |
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39 | |
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40 | |
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41 | namespace Poco { |
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42 | |
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43 | |
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44 | MemoryPool::MemoryPool(std::size_t blockSize, int preAlloc, int maxAlloc): |
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45 | _blockSize(blockSize), |
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46 | _maxAlloc(maxAlloc), |
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47 | _allocated(preAlloc) |
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48 | { |
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49 | poco_assert (maxAlloc == 0 || maxAlloc >= preAlloc); |
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50 | poco_assert (preAlloc >= 0 && maxAlloc >= 0); |
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51 | |
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52 | int r = BLOCK_RESERVE; |
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53 | if (preAlloc > r) |
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54 | r = preAlloc; |
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55 | if (maxAlloc > 0 && maxAlloc < r) |
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56 | r = maxAlloc; |
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57 | _blocks.reserve(r); |
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58 | for (int i = 0; i < preAlloc; ++i) |
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59 | { |
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60 | _blocks.push_back(new char[_blockSize]); |
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61 | } |
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62 | } |
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63 | |
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64 | |
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65 | MemoryPool::~MemoryPool() |
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66 | { |
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67 | for (BlockVec::iterator it = _blocks.begin(); it != _blocks.end(); ++it) |
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68 | { |
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69 | delete [] *it; |
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70 | } |
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71 | } |
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72 | |
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73 | |
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74 | void* MemoryPool::get() |
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75 | { |
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76 | FastMutex::ScopedLock lock(_mutex); |
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77 | |
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78 | if (_blocks.empty()) |
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79 | { |
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80 | if (_maxAlloc == 0 || _allocated < _maxAlloc) |
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81 | { |
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82 | ++_allocated; |
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83 | return new char[_blockSize]; |
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84 | } |
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85 | else throw OutOfMemoryException("MemoryPool exhausted"); |
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86 | } |
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87 | else |
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88 | { |
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89 | char* ptr = _blocks.back(); |
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90 | _blocks.pop_back(); |
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91 | return ptr; |
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92 | } |
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93 | } |
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94 | |
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95 | |
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96 | void MemoryPool::release(void* ptr) |
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97 | { |
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98 | FastMutex::ScopedLock lock(_mutex); |
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99 | |
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100 | _blocks.push_back(reinterpret_cast<char*>(ptr)); |
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101 | } |
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102 | |
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103 | |
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104 | } // namespace Poco |
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