LLVM  6.0.0svn
ThreadLocal.h
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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_SUPPORT_THREADLOCAL_H
15 #define LLVM_SUPPORT_THREADLOCAL_H
16 
17 #include "llvm/Support/DataTypes.h"
18 #include "llvm/Support/Threading.h"
19 #include <cassert>
20 
21 namespace llvm {
22  namespace sys {
23  // ThreadLocalImpl - Common base class of all ThreadLocal instantiations.
24  // YOU SHOULD NEVER USE THIS DIRECTLY.
26  typedef uint64_t ThreadLocalDataTy;
27  /// \brief Platform-specific thread local data.
28  ///
29  /// This is embedded in the class and we avoid malloc'ing/free'ing it,
30  /// to make this class more safe for use along with CrashRecoveryContext.
31  union {
32  char data[sizeof(ThreadLocalDataTy)];
33  ThreadLocalDataTy align_data;
34  };
35  public:
37  virtual ~ThreadLocalImpl();
38  void setInstance(const void* d);
39  void *getInstance();
40  void removeInstance();
41  };
42 
43  /// ThreadLocal - A class used to abstract thread-local storage. It holds,
44  /// for each thread, a pointer a single object of type T.
45  template<class T>
46  class ThreadLocal : public ThreadLocalImpl {
47  public:
49 
50  /// get - Fetches a pointer to the object associated with the current
51  /// thread. If no object has yet been associated, it returns NULL;
52  T* get() { return static_cast<T*>(getInstance()); }
53 
54  // set - Associates a pointer to an object with the current thread.
55  void set(T* d) { setInstance(d); }
56 
57  // erase - Removes the pointer associated with the current thread.
58  void erase() { removeInstance(); }
59  };
60  }
61 }
62 
63 #endif
Compute iterated dominance frontiers using a linear time algorithm.
Definition: AllocatorList.h:24
char data[sizeof(ThreadLocalDataTy)]
Definition: ThreadLocal.h:32
ThreadLocal - A class used to abstract thread-local storage.
Definition: ThreadLocal.h:46
void setInstance(const void *d)
ThreadLocalDataTy align_data
Definition: ThreadLocal.h:33