summaryrefslogtreecommitdiff
path: root/lib/Support/Windows/ThreadLocal.inc
blob: 3914cf72fa95d143eb3cb91c7711ec24c748948b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
//= llvm/Support/Win32/ThreadLocal.inc - Win32 Thread Local Data -*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the Win32 specific (non-pthread) ThreadLocal class.
//
//===----------------------------------------------------------------------===//

//===----------------------------------------------------------------------===//
//=== WARNING: Implementation here must contain only generic Win32 code that
//===          is guaranteed to work on *all* Win32 variants.
//===----------------------------------------------------------------------===//

#include "WindowsSupport.h"
#include "llvm/Support/ThreadLocal.h"

namespace llvm {
using namespace sys;

ThreadLocalImpl::ThreadLocalImpl() : data() {
  typedef int SIZE_TOO_BIG[sizeof(DWORD) <= sizeof(data) ? 1 : -1];
  DWORD* tls = reinterpret_cast<DWORD*>(&data);
  *tls = TlsAlloc();
  assert(*tls != TLS_OUT_OF_INDEXES);
}

ThreadLocalImpl::~ThreadLocalImpl() {
  DWORD* tls = reinterpret_cast<DWORD*>(&data);
  TlsFree(*tls);
}

const void* ThreadLocalImpl::getInstance() {
  DWORD* tls = reinterpret_cast<DWORD*>(&data);
  return TlsGetValue(*tls);
}

void ThreadLocalImpl::setInstance(const void* d){
  DWORD* tls = reinterpret_cast<DWORD*>(&data);
  int errorcode = TlsSetValue(*tls, const_cast<void*>(d));
  assert(errorcode != 0);
  (void)errorcode;
}

void ThreadLocalImpl::removeInstance() {
  setInstance(0);
}

}