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// Copyright (c) 2006- Facebook
// Distributed under the Thrift Software License
//
// See accompanying file LICENSE or visit the Thrift site at:
// http://developers.facebook.com/thrift/
#ifndef _THRIFT_CONCURRENCY_MUTEX_H_
#define _THRIFT_CONCURRENCY_MUTEX_H_ 1
#include <boost/shared_ptr.hpp>
namespace facebook { namespace thrift { namespace concurrency {
/**
* A simple mutex class
*
* @author marc
* @version $Id:$
*/
class Mutex {
public:
typedef void (*Initializer)(void*);
Mutex(Initializer init = DEFAULT_INITIALIZER);
virtual ~Mutex() {}
virtual void lock() const;
virtual bool trylock() const;
virtual void unlock() const;
static void DEFAULT_INITIALIZER(void*);
#ifdef PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
static void ADAPTIVE_INITIALIZER(void*);
#endif
#ifdef PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
static void RECURSIVE_INITIALIZER(void*);
#endif
private:
class impl;
boost::shared_ptr<impl> impl_;
};
class ReadWriteMutex {
public:
ReadWriteMutex();
virtual ~ReadWriteMutex() {}
// these get the lock and block until it is done successfully
virtual void acquireRead() const;
virtual void acquireWrite() const;
// these attempt to get the lock, returning false immediately if they fail
virtual bool attemptRead() const;
virtual bool attemptWrite() const;
// this releases both read and write locks
virtual void release() const;
private:
class impl;
boost::shared_ptr<impl> impl_;
};
class Guard {
public:
Guard(const Mutex& value) : mutex_(value) {
mutex_.lock();
}
~Guard() {
mutex_.unlock();
}
private:
const Mutex& mutex_;
};
class RWGuard {
public:
RWGuard(const ReadWriteMutex& value, bool write = 0) : rw_mutex_(value) {
if (write) {
rw_mutex_.acquireWrite();
} else {
rw_mutex_.acquireRead();
}
}
~RWGuard() {
rw_mutex_.release();
}
private:
const ReadWriteMutex& rw_mutex_;
};
// A little hack to prevent someone from trying to do "Guard(m);"
// Sorry for polluting the global namespace, but I think it's worth it.
#define Guard(m) incorrect_use_of_Guard(m)
#define RWGuard(m) incorrect_use_of_RWGuard(m)
}}} // facebook::thrift::concurrency
#endif // #ifndef _THRIFT_CONCURRENCY_MUTEX_H_
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