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
22namespace llvm {
23using namespace sys;
24
25ThreadLocalImpl::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
32ThreadLocalImpl::~ThreadLocalImpl() {
33  DWORD* tls = reinterpret_cast<DWORD*>(&data);
34  TlsFree(*tls);
35}
36
37void *ThreadLocalImpl::getInstance() {
38  DWORD* tls = reinterpret_cast<DWORD*>(&data);
39  return TlsGetValue(*tls);
40}
41
42void 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
49void ThreadLocalImpl::removeInstance() {
50  setInstance(0);
51}
52
53}
54