forked from membase/ep-engine
/
mutex.hh
54 lines (42 loc) · 950 Bytes
/
mutex.hh
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/* -*- Mode: C++; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
#ifndef MUTEX_HH
#define MUTEX_HH 1
#include <stdexcept>
#include <iostream>
#include <sstream>
#include <pthread.h>
#include <cerrno>
#include <cstring>
#include <cassert>
#include "common.hh"
/**
* Abstraction built on top of pthread mutexes
*/
class Mutex {
public:
Mutex();
virtual ~Mutex();
/**
* True if I own this lock.
*
* Use this only for assertions.
*/
bool ownsLock() {
return held && pthread_equal(holder, pthread_self());
}
protected:
// The holders of locks twiddle these flags.
friend class LockHolder;
friend class MultiLockHolder;
void acquire();
void release();
void setHolder(bool isHeld) {
held = isHeld;
holder = pthread_self();
}
pthread_mutex_t mutex;
pthread_t holder;
bool held;
DISALLOW_COPY_AND_ASSIGN(Mutex);
};
#endif