1218885Sdim//===- llvm/Support/ThreadLocal.h - 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 declares the llvm::sys::ThreadLocal class. 11218885Sdim// 12218885Sdim//===----------------------------------------------------------------------===// 13218885Sdim 14249423Sdim#ifndef LLVM_SUPPORT_THREADLOCAL_H 15249423Sdim#define LLVM_SUPPORT_THREADLOCAL_H 16218885Sdim 17249423Sdim#include "llvm/Support/DataTypes.h" 18218885Sdim#include "llvm/Support/Threading.h" 19218885Sdim#include <cassert> 20218885Sdim 21218885Sdimnamespace llvm { 22218885Sdim namespace sys { 23218885Sdim // ThreadLocalImpl - Common base class of all ThreadLocal instantiations. 24218885Sdim // YOU SHOULD NEVER USE THIS DIRECTLY. 25218885Sdim class ThreadLocalImpl { 26239462Sdim typedef uint64_t ThreadLocalDataTy; 27239462Sdim /// \brief Platform-specific thread local data. 28239462Sdim /// 29239462Sdim /// This is embedded in the class and we avoid malloc'ing/free'ing it, 30239462Sdim /// to make this class more safe for use along with CrashRecoveryContext. 31239462Sdim union { 32239462Sdim char data[sizeof(ThreadLocalDataTy)]; 33239462Sdim ThreadLocalDataTy align_data; 34239462Sdim }; 35218885Sdim public: 36218885Sdim ThreadLocalImpl(); 37218885Sdim virtual ~ThreadLocalImpl(); 38218885Sdim void setInstance(const void* d); 39218885Sdim const void* getInstance(); 40218885Sdim void removeInstance(); 41218885Sdim }; 42218885Sdim 43218885Sdim /// ThreadLocal - A class used to abstract thread-local storage. It holds, 44218885Sdim /// for each thread, a pointer a single object of type T. 45218885Sdim template<class T> 46218885Sdim class ThreadLocal : public ThreadLocalImpl { 47218885Sdim public: 48218885Sdim ThreadLocal() : ThreadLocalImpl() { } 49218885Sdim 50218885Sdim /// get - Fetches a pointer to the object associated with the current 51218885Sdim /// thread. If no object has yet been associated, it returns NULL; 52218885Sdim T* get() { return static_cast<T*>(getInstance()); } 53218885Sdim 54218885Sdim // set - Associates a pointer to an object with the current thread. 55218885Sdim void set(T* d) { setInstance(d); } 56218885Sdim 57218885Sdim // erase - Removes the pointer associated with the current thread. 58218885Sdim void erase() { removeInstance(); } 59218885Sdim }; 60218885Sdim } 61218885Sdim} 62218885Sdim 63218885Sdim#endif 64