ThreadLocal.cpp revision 276479
1218885Sdim//===- ThreadLocal.cpp - Thread Local Data ----------------------*- C++ -*-===// 2218885Sdim// 3218885Sdim// The LLVM Compiler Infrastructure 4218885Sdim// 5218885Sdim// This file is distributed under the University of Illinois Open Source 6218885Sdim// License. See LICENSE.TXT for details. 7218885Sdim// 8218885Sdim//===----------------------------------------------------------------------===// 9218885Sdim// 10218885Sdim// This file implements the llvm::sys::ThreadLocal class. 11218885Sdim// 12218885Sdim//===----------------------------------------------------------------------===// 13218885Sdim 14218885Sdim#include "llvm/Config/config.h" 15276479Sdim#include "llvm/Support/Compiler.h" 16218885Sdim#include "llvm/Support/ThreadLocal.h" 17218885Sdim 18218885Sdim//===----------------------------------------------------------------------===// 19218885Sdim//=== WARNING: Implementation here must contain only TRULY operating system 20218885Sdim//=== independent code. 21218885Sdim//===----------------------------------------------------------------------===// 22218885Sdim 23234353Sdim#if !defined(LLVM_ENABLE_THREADS) || LLVM_ENABLE_THREADS == 0 24218885Sdim// Define all methods as no-ops if threading is explicitly disabled 25218885Sdimnamespace llvm { 26218885Sdimusing namespace sys; 27261991SdimThreadLocalImpl::ThreadLocalImpl() : data() { } 28218885SdimThreadLocalImpl::~ThreadLocalImpl() { } 29239462Sdimvoid ThreadLocalImpl::setInstance(const void* d) { 30276479Sdim static_assert(sizeof(d) <= sizeof(data), "size too big"); 31239462Sdim void **pd = reinterpret_cast<void**>(&data); 32239462Sdim *pd = const_cast<void*>(d); 33218885Sdim} 34239462Sdimconst void* ThreadLocalImpl::getInstance() { 35239462Sdim void **pd = reinterpret_cast<void**>(&data); 36239462Sdim return *pd; 37239462Sdim} 38239462Sdimvoid ThreadLocalImpl::removeInstance() { 39239462Sdim setInstance(0); 40239462Sdim} 41239462Sdim} 42218885Sdim#else 43218885Sdim 44218885Sdim#if defined(HAVE_PTHREAD_H) && defined(HAVE_PTHREAD_GETSPECIFIC) 45218885Sdim 46218885Sdim#include <cassert> 47218885Sdim#include <pthread.h> 48218885Sdim#include <stdlib.h> 49218885Sdim 50218885Sdimnamespace llvm { 51218885Sdimusing namespace sys; 52218885Sdim 53239462SdimThreadLocalImpl::ThreadLocalImpl() : data() { 54276479Sdim static_assert(sizeof(pthread_key_t) <= sizeof(data), "size too big"); 55239462Sdim pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data); 56276479Sdim int errorcode = pthread_key_create(key, nullptr); 57218885Sdim assert(errorcode == 0); 58218885Sdim (void) errorcode; 59218885Sdim} 60218885Sdim 61218885SdimThreadLocalImpl::~ThreadLocalImpl() { 62239462Sdim pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data); 63218885Sdim int errorcode = pthread_key_delete(*key); 64218885Sdim assert(errorcode == 0); 65218885Sdim (void) errorcode; 66218885Sdim} 67218885Sdim 68218885Sdimvoid ThreadLocalImpl::setInstance(const void* d) { 69239462Sdim pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data); 70218885Sdim int errorcode = pthread_setspecific(*key, d); 71218885Sdim assert(errorcode == 0); 72218885Sdim (void) errorcode; 73218885Sdim} 74218885Sdim 75218885Sdimconst void* ThreadLocalImpl::getInstance() { 76239462Sdim pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data); 77218885Sdim return pthread_getspecific(*key); 78218885Sdim} 79218885Sdim 80218885Sdimvoid ThreadLocalImpl::removeInstance() { 81276479Sdim setInstance(nullptr); 82218885Sdim} 83218885Sdim 84218885Sdim} 85218885Sdim 86218885Sdim#elif defined(LLVM_ON_UNIX) 87218885Sdim#include "Unix/ThreadLocal.inc" 88218885Sdim#elif defined( LLVM_ON_WIN32) 89218885Sdim#include "Windows/ThreadLocal.inc" 90218885Sdim#else 91226633Sdim#warning Neither LLVM_ON_UNIX nor LLVM_ON_WIN32 set in Support/ThreadLocal.cpp 92218885Sdim#endif 93218885Sdim#endif 94