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annotate src/fiber_win32.cpp @ 10480:649ba332458f draft

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(svn r14735) -Codechange: remove a bit of bit-waste in the map array (without changing the map array) and make the CompanyIDs contiguous. -Note: 15 should be enough for now... making it any more means adding more bytes to the map array and thus wasting more bits instead of reducing the bit waste.
author rubidium <rubidium@openttd.org>
date Wed, 24 Dec 2008 09:53:15 +0000 (2008-12-24)
parents a56c5ca0f396
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
8934
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1 /* $Id$ */
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2
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3 /** @file fiber_win32.cpp Win32 implementation of Fiber. */
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4
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5 #include "stdafx.h"
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6 #include "fiber.hpp"
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7 #include <stdlib.h>
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8 #include <windows.h>
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9 #include <process.h>
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10
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11 class Fiber_Win32 : public Fiber {
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12 private:
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13 LPVOID m_fiber;
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14 FiberFunc m_proc;
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15 void *m_param;
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16 bool m_attached;
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17
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18 static Fiber_Win32 *s_main;
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19
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20 public:
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21 /**
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22 * Create a win32 fiber and start it, calling proc(param).
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23 */
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24 Fiber_Win32(FiberFunc proc, void *param) :
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25 m_fiber(NULL),
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26 m_proc(proc),
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27 m_param(param),
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28 m_attached(false)
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29 {
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30 CreateFiber();
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31 }
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32
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33 /**
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34 * Create a win32 fiber and attach current thread to it.
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35 */
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36 Fiber_Win32(void *param) :
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37 m_fiber(NULL),
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38 m_proc(NULL),
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39 m_param(param),
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40 m_attached(true)
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41 {
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42 ConvertThreadToFiber();
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43 if (s_main == NULL) s_main = this;
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44 }
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45
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46 /* virtual */ ~Fiber_Win32()
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47 {
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48 if (this->m_fiber != NULL) {
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49 if (this->m_attached) {
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50 this->ConvertFiberToThread();
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51 } else {
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52 this->DeleteFiber();
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53 }
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54 }
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55 }
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56
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57 /* virtual */ void SwitchToFiber()
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58 {
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59 typedef VOID (WINAPI *FnSwitchToFiber)(LPVOID fiber);
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60
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61 static FnSwitchToFiber fnSwitchToFiber = (FnSwitchToFiber)stGetProcAddr("SwitchToFiber");
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62 assert(fnSwitchToFiber != NULL);
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63
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64 fnSwitchToFiber(this->m_fiber);
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65 }
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66
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67 /* virtual */ void Exit()
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68 {
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69 /* Simply switch back to the main fiber, we kill the fiber sooner or later */
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70 s_main->SwitchToFiber();
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71 }
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72
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73 /* virtual */ bool IsRunning()
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74 {
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75 return this->m_fiber != NULL;
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76 }
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77
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78 /* virtual */ void *GetFiberData()
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79 {
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80 return this->m_param;
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81 }
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82
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83 /**
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84 * Win95 doesn't have Fiber support. So check if we have Fiber support,
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85 * and else fall back on Fiber_Thread.
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86 */
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87 static bool IsSupported()
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88 {
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89 static bool first_run = true;
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90 static bool is_supported = false;
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91
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92 if (first_run) {
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93 first_run = false;
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94 static const char *names[] = {
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95 "ConvertThreadToFiber",
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96 "CreateFiber",
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97 "DeleteFiber",
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98 "ConvertFiberToThread",
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99 "SwitchToFiber"};
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100 for (size_t i = 0; i < lengthof(names); i++) {
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101 if (stGetProcAddr(names[i]) == NULL) return false;
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102 }
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103 is_supported = true;
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104 }
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105 return is_supported;
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106 }
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107
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108 private:
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109 /**
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110 * Get a function from kernel32.dll.
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111 * @param name Function to get.
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112 * @return Proc to the function, or NULL when not found.
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113 */
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114 static FARPROC stGetProcAddr(const char *name)
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115 {
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116 static HMODULE hKernel = LoadLibraryA("kernel32.dll");
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117 return GetProcAddress(hKernel, name);
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118 }
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119
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120 /**
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121 * First function which is called within the fiber.
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122 */
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123 static VOID CALLBACK stFiberProc(LPVOID fiber)
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124 {
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125 Fiber_Win32 *cur = (Fiber_Win32 *)fiber;
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126 cur->m_proc(cur->m_param);
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127 }
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128
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129 /**
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130 * Delete a fiber.
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131 */
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132 void DeleteFiber()
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133 {
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134 typedef VOID (WINAPI *FnDeleteFiber)(LPVOID lpFiber);
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135
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136 static FnDeleteFiber fnDeleteFiber = (FnDeleteFiber)stGetProcAddr("DeleteFiber");
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137 assert(fnDeleteFiber != NULL);
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138
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139 fnDeleteFiber(this->m_fiber);
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140 this->m_fiber = NULL;
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141 }
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142
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143 /**
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144 * Convert a current thread to a fiber.
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145 */
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146 void ConvertThreadToFiber()
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147 {
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148 typedef LPVOID (WINAPI *FnConvertThreadToFiber)(LPVOID lpParameter);
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149
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150 static FnConvertThreadToFiber fnConvertThreadToFiber = (FnConvertThreadToFiber)stGetProcAddr("ConvertThreadToFiber");
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151 assert(fnConvertThreadToFiber != NULL);
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152
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153 this->m_fiber = fnConvertThreadToFiber(this);
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154 }
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155
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156 /**
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157 * Create a new fiber.
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158 */
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159 void CreateFiber()
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160 {
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161 typedef LPVOID (WINAPI *FnCreateFiber)(SIZE_T dwStackSize, LPFIBER_START_ROUTINE lpStartAddress, LPVOID lpParameter);
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162
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163 static FnCreateFiber fnCreateFiber = (FnCreateFiber)stGetProcAddr("CreateFiber");
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164 assert(fnCreateFiber != NULL);
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165
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166 this->m_fiber = fnCreateFiber(0, &stFiberProc, this);
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167 }
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168
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169 /**
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170 * Convert a fiber back to a thread.
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171 */
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172 void ConvertFiberToThread()
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173 {
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174 typedef BOOL (WINAPI *FnConvertFiberToThread)();
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175
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176 static FnConvertFiberToThread fnConvertFiberToThread = (FnConvertFiberToThread)stGetProcAddr("ConvertFiberToThread");
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177 assert(fnConvertFiberToThread != NULL);
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178
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179 fnConvertFiberToThread();
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180 this->m_fiber = NULL;
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181 }
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182 };
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183
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184 /* Initialize the static member of Fiber_Win32 */
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185 /* static */ Fiber_Win32 *Fiber_Win32::s_main = NULL;
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186
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187 /* Include Fiber_Thread, as Win95 needs it */
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188 #include "fiber_thread.cpp"
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189
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190 /* static */ Fiber *Fiber::New(FiberFunc proc, void *param)
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191 {
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192 if (Fiber_Win32::IsSupported()) return new Fiber_Win32(proc, param);
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193 return new Fiber_Thread(proc, param);
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194 }
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195
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196 /* static */ Fiber *Fiber::AttachCurrent(void *param)
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197 {
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198 if (Fiber_Win32::IsSupported()) return new Fiber_Win32(param);
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199 return new Fiber_Thread(param);
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200 }
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201
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202 /* static */ void *Fiber::GetCurrentFiberData()
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203 {
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204 if (Fiber_Win32::IsSupported()) return ((Fiber *)::GetFiberData())->GetFiberData();
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205 return Fiber_Thread::GetCurrentFiber()->GetFiberData();
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206 }