1//=== llvm/Support/Unix/ThreadLocal.inc - Unix Thread Local Data -*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file implements the Unix specific (non-pthread) ThreadLocal class.
10//
11//===----------------------------------------------------------------------===//
12
13//===----------------------------------------------------------------------===//
14//=== WARNING: Implementation here must contain only generic UNIX code that
15//===          is guaranteed to work on *all* UNIX variants.
16//===----------------------------------------------------------------------===//
17
18#include "llvm/Config/config.h"
19
20#if defined(HAVE_PTHREAD_H) && defined(HAVE_PTHREAD_GETSPECIFIC)
21
22#include <cassert>
23#include <pthread.h>
24#include <stdlib.h>
25
26namespace llvm {
27using namespace sys;
28
29ThreadLocalImpl::ThreadLocalImpl() : data() {
30  static_assert(sizeof(pthread_key_t) <= sizeof(data), "size too big");
31  pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);
32  int errorcode = pthread_key_create(key, nullptr);
33  assert(errorcode == 0);
34  (void) errorcode;
35}
36
37ThreadLocalImpl::~ThreadLocalImpl() {
38  pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);
39  int errorcode = pthread_key_delete(*key);
40  assert(errorcode == 0);
41  (void) errorcode;
42}
43
44void ThreadLocalImpl::setInstance(const void* d) {
45  pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);
46  int errorcode = pthread_setspecific(*key, d);
47  assert(errorcode == 0);
48  (void) errorcode;
49}
50
51void *ThreadLocalImpl::getInstance() {
52  pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);
53  return pthread_getspecific(*key);
54}
55
56void ThreadLocalImpl::removeInstance() {
57  setInstance(nullptr);
58}
59
60}
61#else
62namespace llvm {
63using namespace sys;
64ThreadLocalImpl::ThreadLocalImpl() : data() { }
65ThreadLocalImpl::~ThreadLocalImpl() { }
66void ThreadLocalImpl::setInstance(const void* d) { data = const_cast<void*>(d);}
67void *ThreadLocalImpl::getInstance() { return data; }
68void ThreadLocalImpl::removeInstance() { setInstance(0); }
69}
70#endif
71