ThreadLocalValueImpl.h
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#pragma once
#include "il2cpp-config.h"
#if IL2CPP_THREADS_WIN32
#include "os/c-api/il2cpp-config-platforms.h"
#include "os/ErrorCodes.h"
#include "utils/NonCopyable.h"
// We declare windows APIs here instead of including windows system headers
// to avoid leaking windows system headers to all of il2cpp and il2cpp-generated
// code.
// On UWP, old Windows SDKs (10586 and older) did not have support for Tls* functions
// so instead we used forwarded them to Fls* equivalents. Using Tls* functions directly
// with these old SDKs causes linker errors.
#define IL2CPP_USE_WINRT_FLS_WORKAROUND (IL2CPP_TARGET_WINRT && WINDOWS_SDK_BUILD_VERSION <= 10586)
#if !IL2CPP_USE_WINRT_FLS_WORKAROUND
extern "C" {
__declspec(dllimport) unsigned long __stdcall TlsAlloc(void);
__declspec(dllimport) void* __stdcall TlsGetValue(unsigned long dwTlsIndex);
__declspec(dllimport) int __stdcall TlsSetValue(unsigned long dwTlsIndex, void* lpTlsValue);
__declspec(dllimport) int __stdcall TlsFree(unsigned long dwTlsIndex);
__declspec(dllimport) unsigned long __stdcall GetLastError(void);
}
#else
extern "C" {
typedef void (__stdcall* PFLS_CALLBACK_FUNCTION)(void* lpFlsData);
__declspec(dllimport) unsigned long __stdcall FlsAlloc(PFLS_CALLBACK_FUNCTION callback);
__declspec(dllimport) void* __stdcall FlsGetValue(unsigned long dwTlsIndex);
__declspec(dllimport) int __stdcall FlsSetValue(unsigned long dwTlsIndex, void* lpTlsValue);
__declspec(dllimport) int __stdcall FlsFree(unsigned long dwTlsIndex);
__declspec(dllimport) unsigned long __stdcall GetLastError(void);
}
#define TlsAlloc() FlsAlloc(NULL)
#define TlsGetValue FlsGetValue
#define TlsSetValue FlsSetValue
#define TlsFree FlsFree
#endif
#define IL2CPP_TLS_OUT_OF_INDEXES ((unsigned long)0xFFFFFFFF)
namespace il2cpp
{
namespace os
{
class ThreadLocalValueImpl : public il2cpp::utils::NonCopyable
{
public:
inline ThreadLocalValueImpl()
{
m_Index = TlsAlloc();
IL2CPP_ASSERT(m_Index != IL2CPP_TLS_OUT_OF_INDEXES);
}
inline ~ThreadLocalValueImpl()
{
bool success = TlsFree(m_Index);
NO_UNUSED_WARNING(success);
IL2CPP_ASSERT(success);
}
inline ErrorCode SetValue(void* value)
{
if (TlsSetValue(m_Index, value) == false)
return static_cast<ErrorCode>(GetLastError());
return kErrorCodeSuccess;
}
inline ErrorCode GetValue(void** value)
{
*value = TlsGetValue(m_Index);
if (*value)
return kErrorCodeSuccess;
unsigned long lastError = GetLastError();
if (lastError == 0)
return kErrorCodeSuccess;
return static_cast<ErrorCode>(lastError);
}
private:
unsigned long m_Index;
};
}
}
#if IL2CPP_USE_WINRT_FLS_WORKAROUND
#undef TlsAlloc
#undef TlsGetValue
#undef TlsSetValue
#undef TlsFree
#endif
#endif // IL2CPP_THREADS_WIN32