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
24 namespace llvm {
25 using namespace sys;
26 ThreadLocalImpl::ThreadLocalImpl() { }
27 ThreadLocalImpl::~ThreadLocalImpl() { }
28 void ThreadLocalImpl::setInstance(const void* d) { data = const_cast<void*>(d);}
29 const void* ThreadLocalImpl::getInstance() { return data; }
30 void 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 
40 namespace llvm {
41 using namespace sys;
42 
43 ThreadLocalImpl::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 
51 ThreadLocalImpl::~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 
59 void 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 
66 const void* ThreadLocalImpl::getInstance() {
67   pthread_key_t* key = static_cast<pthread_key_t*>(data);
68   return pthread_getspecific(*key);
69 }
70 
71 void 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 set in Support/ThreadLocal.cpp
83 #endif
84 #endif
85