mutexDebug.h

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/**
 * PANDA 3D SOFTWARE
 * Copyright (c) Carnegie Mellon University.  All rights reserved.
 *
 * All use of this software is subject to the terms of the revised BSD
 * license.  You should have received a copy of this license along
 * with this source code in a file named "LICENSE."
 *
 * @file mutexDebug.h
 * @author drose
 * @date 2006-02-13
 */

#ifndef MUTEXDEBUG_H
#define MUTEXDEBUG_H

#include "pandabase.h"
#include "mutexTrueImpl.h"
#include "conditionVarImpl.h"
#include "thread.h"
#include "namable.h"
#include "pmap.h"

#ifdef DEBUG_THREADS

/**
 * This class implements a standard mutex the hard way, by doing everything by
 * hand.  This does allow fancy things like deadlock detection, however.
 */
class EXPCL_PANDA_PIPELINE MutexDebug : public Namable {
protected:
  MutexDebug(const std::string &name, bool allow_recursion, bool lightweight);
  MutexDebug(const MutexDebug &copy) = delete;
  virtual ~MutexDebug();

  void operator = (const MutexDebug &copy) = delete;

public:
  INLINE void lock();
  INLINE bool try_lock();
  INLINE void unlock();

PUBLISHED:
  BLOCKING INLINE void acquire(Thread *current_thread = Thread::get_current_thread()) const;
  BLOCKING INLINE bool try_acquire(Thread *current_thread = Thread::get_current_thread()) const;
  INLINE void elevate_lock() const;
  INLINE void release() const;
  INLINE bool debug_is_locked() const;

  virtual void output(std::ostream &out) const;
  void output_with_holder(std::ostream &out) const;

  typedef void VoidFunc();

public:
  static void increment_pstats();
  static void decrement_pstats();

private:
  void do_lock(Thread *current_thread);
  bool do_try_lock(Thread *current_thread);
  void do_unlock();
  bool do_debug_is_locked() const;

  void report_deadlock(Thread *current_thread);

private:
  INLINE static MutexTrueImpl *get_global_lock();

  bool _allow_recursion;
  bool _lightweight;
  Thread *_locking_thread;
  int _lock_count;
  char *_deleted_name; // To help I.D. a destructed mutex.

  // For _lightweight mutexes.
  typedef pmap<Thread *, int> MissedThreads;
  MissedThreads _missed_threads;

  ConditionVarImpl _cvar_impl;

  static int _pstats_count;
  static MutexTrueImpl *_global_lock;

  friend class ConditionVarDebug;
  friend class ConditionVarFullDebug;
};

INLINE std::ostream &
operator << (std::ostream &out, const MutexDebug &m) {
  m.output(out);
  return out;
}

#include "mutexDebug.I"

#endif  //  DEBUG_THREADS

#endif