src/llvm/lib/Support/Windows/ThreadLocal.inc

   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 }