compiler-rt/lib/tsan/rtl/tsan_mutex.h

//===-- tsan_mutex.h --------------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a part of ThreadSanitizer (TSan), a race detector.
//
//===----------------------------------------------------------------------===//
#ifndef TSAN_MUTEX_H
#define TSAN_MUTEX_H

#include "sanitizer_common/sanitizer_atomic.h"
#include "tsan_defs.h"

namespace __tsan {

enum MutexType {
  MutexTypeInvalid,
  MutexTypeTrace,
  MutexTypeThreads,
  MutexTypeReport,
  MutexTypeSyncVar,
  MutexTypeSyncTab,
  MutexTypeSlab,
  MutexTypeAnnotations,
  MutexTypeAtExit,

  // This must be the last.
  MutexTypeCount,
};

class Mutex {
 public:
  explicit Mutex(MutexType type, StatType stat_type);
  ~Mutex();

  void Lock();
  void Unlock();

  void ReadLock();
  void ReadUnlock();

 private:
  atomic_uintptr_t state_;
#if TSAN_DEBUG
  MutexType type_;
#endif
#if TSAN_COLLECT_STATS
  StatType stat_type_;
#endif

  Mutex(const Mutex&);
  void operator = (const Mutex&);
};

class Lock {
 public:
  explicit Lock(Mutex *m);
  ~Lock();

 private:
  Mutex *m_;

  Lock(const Lock&);
  void operator = (const Lock&);
};

class ReadLock {
 public:
  explicit ReadLock(Mutex *m);
  ~ReadLock();

 private:
  Mutex *m_;

  ReadLock(const ReadLock&);
  void operator = (const ReadLock&);
};

class DeadlockDetector {
 public:
  DeadlockDetector();
  void Lock(MutexType t);
  void Unlock(MutexType t);
 private:
  u64 seq_;
  u64 locked_[MutexTypeCount];
};

void InitializeMutex();

}  // namespace __tsan

#endif  // TSAN_MUTEX_H