ThreadLocal.cpp revision 1a18e9a2c4495052b903481c83616265074c4e91 
1//===- ThreadLocal.cpp - 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 llvm::sys::ThreadLocal class.
11//
12//===----------------------------------------------------------------------===//
13
14#include "llvm/Config/config.h"
15#include "llvm/Support/ThreadLocal.h"
16
17//===----------------------------------------------------------------------===//
18//=== WARNING: Implementation here must contain only TRULY operating system
19//===          independent code.
20//===----------------------------------------------------------------------===//
21
22#if !defined(LLVM_ENABLE_THREADS) || LLVM_ENABLE_THREADS == 0
23// Define all methods as no-ops if threading is explicitly disabled
24namespace llvm {
25using namespace sys;
26ThreadLocalImpl::ThreadLocalImpl() { }
27ThreadLocalImpl::~ThreadLocalImpl() { }
28void ThreadLocalImpl::setInstance(const void* d) {
29  typedef int SIZE_TOO_BIG[sizeof(d) <= sizeof(data) ? 1 : -1];
30  void **pd = reinterpret_cast<void**>(&data);
31  *pd = const_cast<void*>(d);
32}
33const void* ThreadLocalImpl::getInstance() { return data; }
34void ThreadLocalImpl::removeInstance() {
35  void **pd = reinterpret_cast<void**>(&data);
36  *pd = 0;
37}
38}
39#else
40
41#if defined(HAVE_PTHREAD_H) && defined(HAVE_PTHREAD_GETSPECIFIC)
42
43#include <cassert>
44#include <pthread.h>
45#include <stdlib.h>
46
47namespace llvm {
48using namespace sys;
49
50ThreadLocalImpl::ThreadLocalImpl() : data() {
51  typedef int SIZE_TOO_BIG[sizeof(pthread_key_t) <= sizeof(data) ? 1 : -1];
52  pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);
53  int errorcode = pthread_key_create(key, NULL);
54  assert(errorcode == 0);
55  (void) errorcode;
56}
57
58ThreadLocalImpl::~ThreadLocalImpl() {
59  pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);
60  int errorcode = pthread_key_delete(*key);
61  assert(errorcode == 0);
62  (void) errorcode;
63}
64
65void ThreadLocalImpl::setInstance(const void* d) {
66  pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);
67  int errorcode = pthread_setspecific(*key, d);
68  assert(errorcode == 0);
69  (void) errorcode;
70}
71
72const void* ThreadLocalImpl::getInstance() {
73  pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);
74  return pthread_getspecific(*key);
75}
76
77void ThreadLocalImpl::removeInstance() {
78  setInstance(0);
79}
80
81}
82
83#elif defined(LLVM_ON_UNIX)
84#include "Unix/ThreadLocal.inc"
85#elif defined( LLVM_ON_WIN32)
86#include "Windows/ThreadLocal.inc"
87#else
88#warning Neither LLVM_ON_UNIX nor LLVM_ON_WIN32 set in Support/ThreadLocal.cpp
89#endif
90#endif
91