1 //===- llvm/Support/ThreadLocal.h - 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 declares the llvm::sys::ThreadLocal class. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_SYSTEM_THREAD_LOCAL_H 15 #define LLVM_SYSTEM_THREAD_LOCAL_H 16 17 #include "llvm/Support/Threading.h" 18 #include <cassert> 19 20 namespace llvm { 21 namespace sys { 22 // ThreadLocalImpl - Common base class of all ThreadLocal instantiations. 23 // YOU SHOULD NEVER USE THIS DIRECTLY. 24 class ThreadLocalImpl { 25 void* data; 26 public: 27 ThreadLocalImpl(); 28 virtual ~ThreadLocalImpl(); 29 void setInstance(const void* d); 30 const void* getInstance(); 31 void removeInstance(); 32 }; 33 34 /// ThreadLocal - A class used to abstract thread-local storage. It holds, 35 /// for each thread, a pointer a single object of type T. 36 template<class T> 37 class ThreadLocal : public ThreadLocalImpl { 38 public: 39 ThreadLocal() : ThreadLocalImpl() { } 40 41 /// get - Fetches a pointer to the object associated with the current 42 /// thread. If no object has yet been associated, it returns NULL; 43 T* get() { return static_cast<T*>(getInstance()); } 44 45 // set - Associates a pointer to an object with the current thread. 46 void set(T* d) { setInstance(d); } 47 48 // erase - Removes the pointer associated with the current thread. 49 void erase() { removeInstance(); } 50 }; 51 } 52 } 53 54 #endif 55
