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 25 namespace llvm { 26 using namespace sys; 27 ThreadLocalImpl::ThreadLocalImpl() : data() { } 28 ThreadLocalImpl::~ThreadLocalImpl() { } 29 void 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 } 34 const void* ThreadLocalImpl::getInstance() { 35 void **pd = reinterpret_cast<void**>(&data); 36 return *pd; 37 } 38 void 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 50 namespace llvm { 51 using namespace sys; 52 53 ThreadLocalImpl::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 61 ThreadLocalImpl::~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 68 void 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 75 const void* ThreadLocalImpl::getInstance() { 76 pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data); 77 return pthread_getspecific(*key); 78 } 79 80 void 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
