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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:
ThreadLocal()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;
get()43       T* get() { return static_cast<T*>(getInstance()); }
44 
45       // set - Associates a pointer to an object with the current thread.
set(T * d)46       void set(T* d) { setInstance(d); }
47 
48       // erase - Removes the pointer associated with the current thread.
erase()49       void erase() { removeInstance(); }
50     };
51   }
52 }
53 
54 #endif
55