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/Compiler.h"
16#include "llvm/Support/ThreadLocal.h"
17
18//===----------------------------------------------------------------------===//
19//=== WARNING: Implementation here must contain only TRULY operating system
20//===          independent code.
21//===----------------------------------------------------------------------===//
22
23#if !defined(LLVM_ENABLE_THREADS) || LLVM_ENABLE_THREADS == 0
24// Define all methods as no-ops if threading is explicitly disabled
25namespace llvm {
26using namespace sys;
27ThreadLocalImpl::ThreadLocalImpl() : data() { }
28ThreadLocalImpl::~ThreadLocalImpl() { }
29void ThreadLocalImpl::setInstance(const void* d) {
30  static_assert(sizeof(d) <= sizeof(data), "size too big");
31  void **pd = reinterpret_cast<void**>(&data);
32  *pd = const_cast<void*>(d);
33}
34const void* ThreadLocalImpl::getInstance() {
35  void **pd = reinterpret_cast<void**>(&data);
36  return *pd;
37}
38void ThreadLocalImpl::removeInstance() {
39  setInstance(0);
40}
41}
42#else
43
44#if defined(HAVE_PTHREAD_H) && defined(HAVE_PTHREAD_GETSPECIFIC)
45
46#include <cassert>
47#include <pthread.h>
48#include <stdlib.h>
49
50namespace llvm {
51using namespace sys;
52
53ThreadLocalImpl::ThreadLocalImpl() : data() {
54  static_assert(sizeof(pthread_key_t) <= sizeof(data), "size too big");
55  pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);
56  int errorcode = pthread_key_create(key, nullptr);
57  assert(errorcode == 0);
58  (void) errorcode;
59}
60
61ThreadLocalImpl::~ThreadLocalImpl() {
62  pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);
63  int errorcode = pthread_key_delete(*key);
64  assert(errorcode == 0);
65  (void) errorcode;
66}
67
68void ThreadLocalImpl::setInstance(const void* d) {
69  pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);
70  int errorcode = pthread_setspecific(*key, d);
71  assert(errorcode == 0);
72  (void) errorcode;
73}
74
75const void* ThreadLocalImpl::getInstance() {
76  pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);
77  return pthread_getspecific(*key);
78}
79
80void ThreadLocalImpl::removeInstance() {
81  setInstance(nullptr);
82}
83
84}
85
86#elif defined(LLVM_ON_UNIX)
87#include "Unix/ThreadLocal.inc"
88#elif defined( LLVM_ON_WIN32)
89#include "Windows/ThreadLocal.inc"
90#else
91#warning Neither LLVM_ON_UNIX nor LLVM_ON_WIN32 set in Support/ThreadLocal.cpp
92#endif
93#endif
94