author | peter1138 |
Sun, 03 Aug 2008 17:35:08 +0000 | |
changeset 9834 | 7474149531c1 |
parent 8934 | f46812d21fe6 |
permissions | -rw-r--r-- |
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/* $Id$ */ |
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/** @file fiber_win32.cpp Win32 implementation of Fiber. */ |
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#include "stdafx.h" |
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#include "fiber.hpp" |
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#include <stdlib.h> |
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#include <windows.h> |
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#include <process.h> |
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class Fiber_Win32 : public Fiber { |
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private: |
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LPVOID m_fiber; |
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FiberFunc m_proc; |
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void *m_param; |
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bool m_attached; |
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static Fiber_Win32 *s_main; |
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public: |
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/** |
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* Create a win32 fiber and start it, calling proc(param). |
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*/ |
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Fiber_Win32(FiberFunc proc, void *param) : |
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m_fiber(NULL), |
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m_proc(proc), |
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m_param(param), |
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m_attached(false) |
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{ |
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CreateFiber(); |
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} |
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/** |
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* Create a win32 fiber and attach current thread to it. |
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*/ |
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Fiber_Win32(void *param) : |
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m_fiber(NULL), |
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m_proc(NULL), |
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m_param(param), |
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m_attached(true) |
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{ |
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ConvertThreadToFiber(); |
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if (s_main == NULL) s_main = this; |
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} |
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/* virtual */ ~Fiber_Win32() |
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{ |
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if (this->m_fiber != NULL) { |
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if (this->m_attached) { |
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this->ConvertFiberToThread(); |
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} else { |
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this->DeleteFiber(); |
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} |
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} |
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} |
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/* virtual */ void SwitchToFiber() |
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{ |
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typedef VOID (WINAPI *FnSwitchToFiber)(LPVOID fiber); |
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static FnSwitchToFiber fnSwitchToFiber = (FnSwitchToFiber)stGetProcAddr("SwitchToFiber"); |
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assert(fnSwitchToFiber != NULL); |
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fnSwitchToFiber(this->m_fiber); |
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} |
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/* virtual */ void Exit() |
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{ |
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/* Simply switch back to the main fiber, we kill the fiber sooner or later */ |
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s_main->SwitchToFiber(); |
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} |
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/* virtual */ bool IsRunning() |
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{ |
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return this->m_fiber != NULL; |
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} |
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/* virtual */ void *GetFiberData() |
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{ |
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return this->m_param; |
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} |
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/** |
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* Win95 doesn't have Fiber support. So check if we have Fiber support, |
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* and else fall back on Fiber_Thread. |
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*/ |
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static bool IsSupported() |
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{ |
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static bool first_run = true; |
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static bool is_supported = false; |
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if (first_run) { |
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first_run = false; |
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static const char *names[] = { |
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"ConvertThreadToFiber", |
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"CreateFiber", |
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"DeleteFiber", |
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"ConvertFiberToThread", |
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"SwitchToFiber"}; |
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for (size_t i = 0; i < lengthof(names); i++) { |
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if (stGetProcAddr(names[i]) == NULL) return false; |
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} |
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is_supported = true; |
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} |
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return is_supported; |
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} |
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private: |
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/** |
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* Get a function from kernel32.dll. |
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* @param name Function to get. |
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* @return Proc to the function, or NULL when not found. |
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*/ |
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static FARPROC stGetProcAddr(const char *name) |
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{ |
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static HMODULE hKernel = LoadLibraryA("kernel32.dll"); |
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return GetProcAddress(hKernel, name); |
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} |
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119 |
|
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/** |
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* First function which is called within the fiber. |
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122 |
*/ |
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static VOID CALLBACK stFiberProc(LPVOID fiber) |
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{ |
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Fiber_Win32 *cur = (Fiber_Win32 *)fiber; |
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cur->m_proc(cur->m_param); |
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} |
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128 |
|
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129 |
/** |
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* Delete a fiber. |
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131 |
*/ |
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void DeleteFiber() |
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133 |
{ |
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typedef VOID (WINAPI *FnDeleteFiber)(LPVOID lpFiber); |
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135 |
|
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static FnDeleteFiber fnDeleteFiber = (FnDeleteFiber)stGetProcAddr("DeleteFiber"); |
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assert(fnDeleteFiber != NULL); |
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138 |
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fnDeleteFiber(this->m_fiber); |
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this->m_fiber = NULL; |
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141 |
} |
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142 |
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143 |
/** |
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* 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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typedef LPVOID (WINAPI *FnConvertThreadToFiber)(LPVOID lpParameter); |
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149 |
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static FnConvertThreadToFiber fnConvertThreadToFiber = (FnConvertThreadToFiber)stGetProcAddr("ConvertThreadToFiber"); |
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assert(fnConvertThreadToFiber != NULL); |
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152 |
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this->m_fiber = fnConvertThreadToFiber(this); |
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154 |
} |
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155 |
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156 |
/** |
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* 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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typedef LPVOID (WINAPI *FnCreateFiber)(SIZE_T dwStackSize, LPFIBER_START_ROUTINE lpStartAddress, LPVOID lpParameter); |
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162 |
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static FnCreateFiber fnCreateFiber = (FnCreateFiber)stGetProcAddr("CreateFiber"); |
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assert(fnCreateFiber != NULL); |
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165 |
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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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* 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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typedef BOOL (WINAPI *FnConvertFiberToThread)(); |
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175 |
|
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static FnConvertFiberToThread fnConvertFiberToThread = (FnConvertFiberToThread)stGetProcAddr("ConvertFiberToThread"); |
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assert(fnConvertFiberToThread != NULL); |
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178 |
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fnConvertFiberToThread(); |
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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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/* 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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#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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if (Fiber_Win32::IsSupported()) return new Fiber_Win32(proc, param); |
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return new Fiber_Thread(proc, param); |
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194 |
} |
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195 |
|
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/* static */ Fiber *Fiber::AttachCurrent(void *param) |
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197 |
{ |
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if (Fiber_Win32::IsSupported()) return new Fiber_Win32(param); |
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return new Fiber_Thread(param); |
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200 |
} |
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201 |
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/* static */ void *Fiber::GetCurrentFiberData() |
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203 |
{ |
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if (Fiber_Win32::IsSupported()) return ((Fiber *)::GetFiberData())->GetFiberData(); |
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return Fiber_Thread::GetCurrentFiber()->GetFiberData(); |
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206 |
} |