ThreadLocal.cpp revision 263508 
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() : data() { }
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() {
34  void **pd = reinterpret_cast<void**>(&data);
35  return *pd;
36}
37void ThreadLocalImpl::removeInstance() {
38  setInstance(0);
39}
40}
41#else
42
43#if defined(HAVE_PTHREAD_H) && defined(HAVE_PTHREAD_GETSPECIFIC)
44
45#include <cassert>
46#include <pthread.h>
47#include <stdlib.h>
48
49namespace llvm {
50using namespace sys;
51
52ThreadLocalImpl::ThreadLocalImpl() : data() {
53  typedef int SIZE_TOO_BIG[sizeof(pthread_key_t) <= sizeof(data) ? 1 : -1];
54  pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);
55  int errorcode = pthread_key_create(key, NULL);
56  assert(errorcode == 0);
57  (void) errorcode;
58}
59
60ThreadLocalImpl::~ThreadLocalImpl() {
61  pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);
62  int errorcode = pthread_key_delete(*key);
63  assert(errorcode == 0);
64  (void) errorcode;
65}
66
67void ThreadLocalImpl::setInstance(const void* d) {
68  pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);
69  int errorcode = pthread_setspecific(*key, d);
70  assert(errorcode == 0);
71  (void) errorcode;
72}
73
74const void* ThreadLocalImpl::getInstance() {
75  pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);
76  return pthread_getspecific(*key);
77}
78
79void ThreadLocalImpl::removeInstance() {
80  setInstance(0);
81}
82
83}
84
85#elif defined(LLVM_ON_UNIX)
86#include "Unix/ThreadLocal.inc"
87#elif defined( LLVM_ON_WIN32)
88#include "Windows/ThreadLocal.inc"
89#else
90#warning Neither LLVM_ON_UNIX nor LLVM_ON_WIN32 set in Support/ThreadLocal.cpp
91#endif
92#endif
93