Mutex.h

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/*
 Copyright Disney Enterprises, Inc.  All rights reserved.

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License
 and the following modification to it: Section 6 Trademarks.
 deleted and replaced with:

 6. Trademarks. This License does not grant permission to use the
 trade names, trademarks, service marks, or product names of the
 Licensor and its affiliates, except as required for reproducing
 the content of the NOTICE file.

 You may obtain a copy of the License at
 http://www.apache.org/licenses/LICENSE-2.0
*/
#ifndef Mutex_h
#define Mutex_h

// #define DEBUG_THREADING

#include "Platform.h"

namespace SeExprInternal2 {
#ifndef NDEBUG
template <class T>
class DebugLock : public T {
  public:
    DebugLock() : _locked(0) {}
    void lock() {
        T::lock();
        _locked = 1;
    }
    void unlock() {
        assert(_locked);
        _locked = 0;
        T::unlock();
    }
    bool locked() { return _locked != 0; }

  private:
    int _locked;
};
#endif

template <class T>
class AutoLock {
  public:
    AutoLock(T& m) : _m(m) { _m.lock(); }
    ~AutoLock() { _m.unlock(); }

  private:
    T& _m;
};

#ifndef NDEBUG
// add debug wrappers to mutex and spinlock
typedef DebugLock<_Mutex> Mutex;
typedef DebugLock<_SpinLock> SpinLock;
#else
typedef _Mutex Mutex;
typedef _SpinLock SpinLock;
#endif

typedef AutoLock<Mutex> AutoMutex;
typedef AutoLock<SpinLock> AutoSpin;
}

#endif