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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#ifndef SPRINGMUTEX_H
#define SPRINGMUTEX_H
//#define USE_FUTEX
#include <atomic>
#if defined(_WIN32)
#include "CriticalSection.h"
#elif defined(__APPLE__) || !defined(USE_FUTEX)
#include <mutex>
#else
#include "Futex.h"
#include <mutex>
#endif
#include <boost/thread/shared_mutex.hpp>
namespace spring {
#if defined(_WIN32)
typedef CriticalSection mutex;
typedef CriticalSection recursive_mutex;
#elif defined(__APPLE__) || !defined(USE_FUTEX)
typedef std::mutex mutex;
typedef std::recursive_mutex recursive_mutex;
#else
typedef spring_futex mutex;
//typedef recursive_futex recursive_mutex;
typedef std::recursive_mutex recursive_mutex;
#endif
class spinlock {
private:
std::atomic_flag state;
public:
spinlock() {
state.clear();
}
void lock()
{
while (state.test_and_set(std::memory_order_acquire)) {
/* busy-wait */
}
}
void unlock()
{
state.clear(std::memory_order_release);
}
};
class shared_spinlock : public boost::shared_mutex {
public:
void lock() {
while (!try_lock()) { /* busy-wait */ }
}
void lock_shared() {
while (!try_lock_shared()) { /* busy-wait */ }
}
};
}
#endif // SPRINGMUTEX_H
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