ThreadLocal.cpp revision 218893 
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(ENABLE_THREADS) || 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) { data = const_cast<void*>(d);}
29const void* ThreadLocalImpl::getInstance() { return data; }
30void ThreadLocalImpl::removeInstance() { data = 0; }
31}
32#else
33
34#if defined(HAVE_PTHREAD_H) && defined(HAVE_PTHREAD_GETSPECIFIC)
35
36#include <cassert>
37#include <pthread.h>
38#include <stdlib.h>
39
40namespace llvm {
41using namespace sys;
42
43ThreadLocalImpl::ThreadLocalImpl() : data(0) {
44  pthread_key_t* key = new pthread_key_t;
45  int errorcode = pthread_key_create(key, NULL);
46  assert(errorcode == 0);
47  (void) errorcode;
48  data = (void*)key;
49}
50
51ThreadLocalImpl::~ThreadLocalImpl() {
52  pthread_key_t* key = static_cast<pthread_key_t*>(data);
53  int errorcode = pthread_key_delete(*key);
54  assert(errorcode == 0);
55  (void) errorcode;
56  delete key;
57}
58
59void ThreadLocalImpl::setInstance(const void* d) {
60  pthread_key_t* key = static_cast<pthread_key_t*>(data);
61  int errorcode = pthread_setspecific(*key, d);
62  assert(errorcode == 0);
63  (void) errorcode;
64}
65
66const void* ThreadLocalImpl::getInstance() {
67  pthread_key_t* key = static_cast<pthread_key_t*>(data);
68  return pthread_getspecific(*key);
69}
70
71void ThreadLocalImpl::removeInstance() {
72  setInstance(0);
73}
74
75}
76
77#elif defined(LLVM_ON_UNIX)
78#include "Unix/ThreadLocal.inc"
79#elif defined( LLVM_ON_WIN32)
80#include "Windows/ThreadLocal.inc"
81#else
82#warning Neither LLVM_ON_UNIX nor LLVM_ON_WIN32 was set in System/ThreadLocal.cpp
83#endif
84#endif
85