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annotate src/leveldb/port/port_win.h @ 3635:af349b425472 draft

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Leveldb Windows port by Edouard Alligand, adapted for MingW by me.
author justmoon <justmoon@members.fsf.org>
date Sat, 21 Jul 2012 14:54:55 +0200
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children e5033c157bc8
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3635
af349b425472 Leveldb Windows port by Edouard Alligand, adapted for MingW by me.
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1 // LevelDB Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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2 // Use of this source code is governed by a BSD-style license that can be
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3 // found in the LICENSE file. See the AUTHORS file for names of contributors.
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4 //
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5 // See port_example.h for documentation for the following types/functions.
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6
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7 // Redistribution and use in source and binary forms, with or without
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8 // modification, are permitted provided that the following conditions are met:
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9 //
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10 // * Redistributions of source code must retain the above copyright
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11 // notice, this list of conditions and the following disclaimer.
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12 // * Redistributions in binary form must reproduce the above copyright
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13 // notice, this list of conditions and the following disclaimer in the
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14 // documentation and/or other materials provided with the distribution.
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15 // * Neither the name of the University of California, Berkeley nor the
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16 // names of its contributors may be used to endorse or promote products
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17 // derived from this software without specific prior written permission.
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18 //
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19 // THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
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20 // EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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21 // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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22 // DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
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23 // DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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24 // (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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25 // LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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26 // ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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28 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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29 //
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30
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31 #ifndef STORAGE_LEVELDB_PORT_PORT_WIN_H_
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32 #define STORAGE_LEVELDB_PORT_PORT_WIN_H_
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33
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34 #ifdef _MSC_VER
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35 #define snprintf _snprintf
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36 #define close _close
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37 #define fread_unlocked _fread_nolock
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38 #endif
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39
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40
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41 #ifdef SNAPPY
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42 #include <snappy/snappy.h>
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43 #endif
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44
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45 #include <string>
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46
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47 #include <stdint.h>
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48
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49 namespace leveldb {
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50 namespace port {
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51
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52 // Windows is little endian (for now :p)
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53 static const bool kLittleEndian = true;
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54
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55 class CondVar;
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56
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57 class Mutex {
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58 public:
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59 Mutex();
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60 ~Mutex();
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61
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62 void Lock();
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63 void Unlock();
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64 void AssertHeld();
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65
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66 private:
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67 friend class CondVar;
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68 // critical sections are more efficient than mutexes
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69 // but they are not recursive and can only be used to synchronize threads within the same process
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70 // additionnaly they cannot be used with SignalObjectAndWait that we use for CondVar
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71 // we use opaque void * to avoid including windows.h in port_win.h
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72 void * mutex_;
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73
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74 // No copying
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75 Mutex(const Mutex&);
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76 void operator=(const Mutex&);
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77 };
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78
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79 // the Win32 API offers a dependable condition variable mechanism, but only starting with
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80 // Windows 2008 and Vista
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81 // no matter what we will implement our own condition variable with a semaphore
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82 // implementation as described in a paper written by Douglas C. Schmidt and Irfan Pyarali
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83 class CondVar {
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84 public:
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85 explicit CondVar(Mutex* mu);
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86 ~CondVar();
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87 void Wait();
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88 void Signal();
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89 void SignalAll();
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90 private:
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91 Mutex* mu_;
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92
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93 Mutex wait_mtx_;
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94 long waiting_;
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95
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96 void * sema_;
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97 void * event_;
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98
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99 bool broadcasted_;
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100 };
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101
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102 // Storage for a lock-free pointer
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103 class AtomicPointer {
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104 private:
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105 void * rep_;
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106 public:
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107 AtomicPointer() : rep_(nullptr) { }
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108 explicit AtomicPointer(void* v);
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109 void* Acquire_Load() const;
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110
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111 void Release_Store(void* v);
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112
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113 void* NoBarrier_Load() const;
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114
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115 void NoBarrier_Store(void* v);
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116 };
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117
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118 typedef volatile long OnceType;
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119 #define LEVELDB_ONCE_INIT (0)
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120
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121 extern void InitOnce(OnceType* once, void (*initializer)());
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122
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123 inline bool Snappy_Compress(const char* input, size_t length,
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124 ::std::string* output) {
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125 #ifdef SNAPPY
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126 output->resize(snappy::MaxCompressedLength(length));
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127 size_t outlen;
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128 snappy::RawCompress(input, length, &(*output)[0], &outlen);
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129 output->resize(outlen);
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130 return true;
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131 #endif
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132
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133 return false;
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134 }
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135
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136 inline bool Snappy_GetUncompressedLength(const char* input, size_t length,
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137 size_t* result) {
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138 #ifdef SNAPPY
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139 return snappy::GetUncompressedLength(input, length, result);
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140 #else
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141 return false;
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142 #endif
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143 }
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144
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145 inline bool Snappy_Uncompress(const char* input, size_t length,
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146 char* output) {
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147 #ifdef SNAPPY
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148 return snappy::RawUncompress(input, length, output);
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149 #else
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150 return false;
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151 #endif
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152 }
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153
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154 inline bool GetHeapProfile(void (*func)(void*, const char*, int), void* arg) {
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155 return false;
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156 }
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157
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158 }
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159 }
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160
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161 #endif // STORAGE_LEVELDB_PORT_PORT_WIN_H_