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
24 namespace llvm {
25 using namespace sys;
26 ThreadLocalImpl::ThreadLocalImpl() { }
27 ThreadLocalImpl::~ThreadLocalImpl() { }
28 void 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 }
33 const void* ThreadLocalImpl::getInstance() { return data; }
34 void 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 
47 namespace llvm {
48 using namespace sys;
49 
50 ThreadLocalImpl::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 
58 ThreadLocalImpl::~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 
65 void 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 
72 const void* ThreadLocalImpl::getInstance() {
73   pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);
74   return pthread_getspecific(*key);
75 }
76 
77 void 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