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() { 34 void **pd = reinterpret_cast<void**>(&data); 35 return *pd; 36 } 37 void ThreadLocalImpl::removeInstance() { 38 setInstance(0); 39 } 40 } 41 #else 42 43 #if defined(HAVE_PTHREAD_H) && defined(HAVE_PTHREAD_GETSPECIFIC) 44 45 #include <cassert> 46 #include <pthread.h> 47 #include <stdlib.h> 48 49 namespace llvm { 50 using namespace sys; 51 52 ThreadLocalImpl::ThreadLocalImpl() : data() { 53 typedef int SIZE_TOO_BIG[sizeof(pthread_key_t) <= sizeof(data) ? 1 : -1]; 54 pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data); 55 int errorcode = pthread_key_create(key, NULL); 56 assert(errorcode == 0); 57 (void) errorcode; 58 } 59 60 ThreadLocalImpl::~ThreadLocalImpl() { 61 pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data); 62 int errorcode = pthread_key_delete(*key); 63 assert(errorcode == 0); 64 (void) errorcode; 65 } 66 67 void ThreadLocalImpl::setInstance(const void* d) { 68 pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data); 69 int errorcode = pthread_setspecific(*key, d); 70 assert(errorcode == 0); 71 (void) errorcode; 72 } 73 74 const void* ThreadLocalImpl::getInstance() { 75 pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data); 76 return pthread_getspecific(*key); 77 } 78 79 void ThreadLocalImpl::removeInstance() { 80 setInstance(0); 81 } 82 83 } 84 85 #elif defined(LLVM_ON_UNIX) 86 #include "Unix/ThreadLocal.inc" 87 #elif defined( LLVM_ON_WIN32) 88 #include "Windows/ThreadLocal.inc" 89 #else 90 #warning Neither LLVM_ON_UNIX nor LLVM_ON_WIN32 set in Support/ThreadLocal.cpp 91 #endif 92 #endif 93
