1 //= llvm/Support/Win32/ThreadLocal.inc - Win32 Thread Local Data -*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file implements the Win32 specific (non-pthread) ThreadLocal class. 11 // 12 //===----------------------------------------------------------------------===// 13 14 //===----------------------------------------------------------------------===// 15 //=== WARNING: Implementation here must contain only generic Win32 code that 16 //=== is guaranteed to work on *all* Win32 variants. 17 //===----------------------------------------------------------------------===// 18 19 #include "WindowsSupport.h" 20 #include "llvm/Support/ThreadLocal.h" 21 22 namespace llvm { 23 using namespace sys; 24 25 ThreadLocalImpl::ThreadLocalImpl() : data() { 26 static_assert(sizeof(DWORD) <= sizeof(data), "size too big"); 27 DWORD* tls = reinterpret_cast<DWORD*>(&data); 28 *tls = TlsAlloc(); 29 assert(*tls != TLS_OUT_OF_INDEXES); 30 } 31 32 ThreadLocalImpl::~ThreadLocalImpl() { 33 DWORD* tls = reinterpret_cast<DWORD*>(&data); 34 TlsFree(*tls); 35 } 36 37 void *ThreadLocalImpl::getInstance() { 38 DWORD* tls = reinterpret_cast<DWORD*>(&data); 39 return TlsGetValue(*tls); 40 } 41 42 void ThreadLocalImpl::setInstance(const void* d){ 43 DWORD* tls = reinterpret_cast<DWORD*>(&data); 44 int errorcode = TlsSetValue(*tls, const_cast<void*>(d)); 45 assert(errorcode != 0); 46 (void)errorcode; 47 } 48 49 void ThreadLocalImpl::removeInstance() { 50 setInstance(0); 51 } 52 53 } 54