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chaiscript_threading.hpp
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133 lines (101 loc) · 3.78 KB
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// This file is distributed under the BSD License.
// See "license.txt" for details.
// Copyright 2009-2012, Jonathan Turner (jonathan@emptycrate.com)
// Copyright 2009-2018, Jason Turner (jason@emptycrate.com)
// http://www.chaiscript.com
// This is an open source non-commercial project. Dear PVS-Studio, please check it.
// PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
#ifndef CHAISCRIPT_THREADING_HPP_
#define CHAISCRIPT_THREADING_HPP_
#include <unordered_map>
#ifndef CHAISCRIPT_NO_THREADS
#include <mutex>
#include <shared_mutex>
#include <thread>
#else
#ifndef CHAISCRIPT_NO_THREADS_WARNING
#pragma message("ChaiScript is compiling without thread safety.")
#endif
#endif
#include "chaiscript_defines.hpp"
/// \file
///
/// This file contains code necessary for thread support in ChaiScript.
/// If the compiler definition CHAISCRIPT_NO_THREADS is defined then thread safety
/// is disabled in ChaiScript. This has the result that some code is faster, because mutex locks are not required.
/// It also has the side effect that the chaiscript::ChaiScript object may not be accessed from more than
/// one thread simultaneously.
/// If threading is enabled, then this namespace contains std thread classes.
/// If threading is not enabled, then stubbed in wrappers that do nothing are provided.
/// This allows us to avoid \#ifdef code in the sections that need thread safety.
namespace chaiscript::detail::threading {
#ifndef CHAISCRIPT_NO_THREADS
template<typename T>
using unique_lock = std::unique_lock<T>;
template<typename T>
using shared_lock = std::shared_lock<T>;
template<typename T>
using lock_guard = std::lock_guard<T>;
using std::shared_mutex;
using std::mutex;
using std::recursive_mutex;
/// Typesafe thread specific storage. If threading is enabled, this class uses a mutex protected map. If
/// threading is not enabled, the class always returns the same data, regardless of which thread it is called from.
template<typename T>
class Thread_Storage {
public:
Thread_Storage() = default;
Thread_Storage(const Thread_Storage &) = delete;
Thread_Storage(Thread_Storage &&) = delete;
Thread_Storage &operator=(const Thread_Storage &) = delete;
Thread_Storage &operator=(Thread_Storage &&) = delete;
~Thread_Storage() { t().erase(this); }
inline const T *operator->() const noexcept { return &(t()[this]); }
inline const T &operator*() const noexcept { return t()[this]; }
inline T *operator->() noexcept { return &(t()[this]); }
inline T &operator*() noexcept { return t()[this]; }
void *m_key;
private:
/// todo: is it valid to make this noexcept? The allocation could fail, but if it
/// does there is no possible way to recover
static std::unordered_map<const void *, T> &t() noexcept {
static thread_local std::unordered_map<const void *, T> my_t;
return my_t;
}
};
#else // threading disabled
template<typename T>
class unique_lock {
public:
constexpr explicit unique_lock(T &) noexcept {}
constexpr void lock() noexcept {}
constexpr void unlock() noexcept {}
};
template<typename T>
class shared_lock {
public:
constexpr explicit shared_lock(T &) noexcept {}
constexpr void lock() noexcept {}
constexpr void unlock() noexcept {}
};
template<typename T>
class lock_guard {
public:
constexpr explicit lock_guard(T &) noexcept {}
};
class shared_mutex {
};
class recursive_mutex {
};
template<typename T>
class Thread_Storage {
public:
constexpr explicit Thread_Storage() noexcept {}
constexpr inline T *operator->() const noexcept { return &obj; }
constexpr inline T &operator*() const noexcept { return obj; }
private:
mutable T obj;
};
#endif
} // namespace chaiscript::detail::threading
#endif