| // (C) Copyright 2013 Ruslan Baratov |
| // Copyright (C) 2014 Vicente J. Botet Escriba |
| // |
| // Distributed under the Boost Software License, Version 1.0. (See accompanying |
| // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| |
| // See www.boost.org/libs/thread for documentation. |
| |
| #ifndef BOOST_THREAD_WITH_LOCK_GUARD_HPP |
| #define BOOST_THREAD_WITH_LOCK_GUARD_HPP |
| |
| #include <boost/thread/lock_guard.hpp> |
| #include <boost/utility/result_of.hpp> |
| //#include <boost/thread/detail/invoke.hpp> |
| |
| namespace boost { |
| |
| #if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && \ |
| !defined(BOOST_NO_CXX11_DECLTYPE) && \ |
| !defined(BOOST_NO_CXX11_TRAILING_RESULT_TYPES) |
| |
| /** |
| * Utility to run functions in scope protected by mutex. |
| * |
| * Examples: |
| * |
| * int func(int, int&); |
| * boost::mutex m; |
| * int a; |
| * int result = boost::with_lock_guard(m, func, 1, boost::ref(a)); |
| * |
| * // using boost::bind |
| * int result = boost::with_lock_guard( |
| * m, boost::bind(func, 2, boost::ref(a)) |
| * ); |
| * |
| * // using lambda |
| * int a; |
| * int result = boost::with_lock_guard( |
| * m, |
| * [&a](int x) { |
| * a = 3; |
| * return x + 4; |
| * }, |
| * 5 |
| * ); |
| */ |
| template <class Lockable, class Function, class... Args> |
| typename boost::result_of<Function(Args...)>::type with_lock_guard( |
| Lockable& m, |
| BOOST_FWD_REF(Function) func, |
| BOOST_FWD_REF(Args)... args |
| ) //-> decltype(func(boost::forward<Args>(args)...)) |
| { |
| boost::lock_guard<Lockable> lock(m); |
| return func(boost::forward<Args>(args)...); |
| } |
| |
| #else |
| |
| // Workaround versions for compilers without c++11 variadic templates support. |
| // (function arguments limit: 4) |
| // (for lambda support define BOOST_RESULT_OF_USE_DECLTYPE may be needed) |
| |
| template <class Lockable, class Func> |
| typename boost::result_of<Func()>::type with_lock_guard( |
| Lockable& m, |
| BOOST_FWD_REF(Func) func |
| ) { |
| boost::lock_guard<Lockable> lock(m); |
| return func(); |
| } |
| |
| template <class Lockable, class Func, class Arg> |
| typename boost::result_of<Func(Arg)>::type with_lock_guard( |
| Lockable& m, |
| BOOST_FWD_REF(Func) func, |
| BOOST_FWD_REF(Arg) arg |
| ) { |
| boost::lock_guard<Lockable> lock(m); |
| return func( |
| boost::forward<Arg>(arg) |
| ); |
| } |
| |
| template <class Lockable, class Func, class Arg1, class Arg2> |
| typename boost::result_of<Func(Arg1, Arg2)>::type with_lock_guard( |
| Lockable& m, |
| BOOST_FWD_REF(Func) func, |
| BOOST_FWD_REF(Arg1) arg1, |
| BOOST_FWD_REF(Arg2) arg2 |
| ) { |
| boost::lock_guard<Lockable> lock(m); |
| return func( |
| boost::forward<Arg1>(arg1), |
| boost::forward<Arg2>(arg2) |
| ); |
| } |
| |
| template <class Lockable, class Func, class Arg1, class Arg2, class Arg3> |
| typename boost::result_of<Func(Arg1, Arg2, Arg3)>::type with_lock_guard( |
| Lockable& m, |
| BOOST_FWD_REF(Func) func, |
| BOOST_FWD_REF(Arg1) arg1, |
| BOOST_FWD_REF(Arg2) arg2, |
| BOOST_FWD_REF(Arg3) arg3 |
| ) { |
| boost::lock_guard<Lockable> lock(m); |
| return func( |
| boost::forward<Arg1>(arg1), |
| boost::forward<Arg2>(arg2), |
| boost::forward<Arg3>(arg3) |
| ); |
| } |
| |
| template < |
| class Lockable, class Func, class Arg1, class Arg2, class Arg3, class Arg4 |
| > |
| typename boost::result_of<Func(Arg1, Arg2, Arg3, Arg4)>::type with_lock_guard( |
| Lockable& m, |
| BOOST_FWD_REF(Func) func, |
| BOOST_FWD_REF(Arg1) arg1, |
| BOOST_FWD_REF(Arg2) arg2, |
| BOOST_FWD_REF(Arg3) arg3, |
| BOOST_FWD_REF(Arg4) arg4 |
| ) { |
| boost::lock_guard<Lockable> lock(m); |
| return func( |
| boost::forward<Arg1>(arg1), |
| boost::forward<Arg2>(arg2), |
| boost::forward<Arg3>(arg3), |
| boost::forward<Arg4>(arg4) |
| ); |
| } |
| |
| // overloads for function pointer |
| // (if argument is not function pointer, static assert will trigger) |
| template <class Lockable, class Func> |
| typename boost::result_of< |
| typename boost::add_pointer<Func>::type() |
| >::type with_lock_guard( |
| Lockable& m, |
| Func* func |
| ) { |
| BOOST_STATIC_ASSERT(boost::is_function<Func>::value); |
| |
| boost::lock_guard<Lockable> lock(m); |
| return func(); |
| } |
| |
| template <class Lockable, class Func, class Arg> |
| typename boost::result_of< |
| typename boost::add_pointer<Func>::type(Arg) |
| >::type with_lock_guard( |
| Lockable& m, |
| Func* func, |
| BOOST_FWD_REF(Arg) arg |
| ) { |
| BOOST_STATIC_ASSERT(boost::is_function<Func>::value); |
| |
| boost::lock_guard<Lockable> lock(m); |
| return func( |
| boost::forward<Arg>(arg) |
| ); |
| } |
| |
| template <class Lockable, class Func, class Arg1, class Arg2> |
| typename boost::result_of< |
| typename boost::add_pointer<Func>::type(Arg1, Arg2) |
| >::type with_lock_guard( |
| Lockable& m, |
| Func* func, |
| BOOST_FWD_REF(Arg1) arg1, |
| BOOST_FWD_REF(Arg2) arg2 |
| ) { |
| BOOST_STATIC_ASSERT(boost::is_function<Func>::value); |
| |
| boost::lock_guard<Lockable> lock(m); |
| return func( |
| boost::forward<Arg1>(arg1), |
| boost::forward<Arg2>(arg2) |
| ); |
| } |
| |
| template <class Lockable, class Func, class Arg1, class Arg2, class Arg3> |
| typename boost::result_of< |
| typename boost::add_pointer<Func>::type(Arg1, Arg2, Arg3) |
| >::type with_lock_guard( |
| Lockable& m, |
| Func* func, |
| BOOST_FWD_REF(Arg1) arg1, |
| BOOST_FWD_REF(Arg2) arg2, |
| BOOST_FWD_REF(Arg3) arg3 |
| ) { |
| BOOST_STATIC_ASSERT(boost::is_function<Func>::value); |
| |
| boost::lock_guard<Lockable> lock(m); |
| return func( |
| boost::forward<Arg1>(arg1), |
| boost::forward<Arg2>(arg2), |
| boost::forward<Arg3>(arg3) |
| ); |
| } |
| |
| template < |
| class Lockable, class Func, class Arg1, class Arg2, class Arg3, class Arg4 |
| > |
| typename boost::result_of< |
| typename boost::add_pointer<Func>::type(Arg1, Arg2, Arg3, Arg4) |
| >::type with_lock_guard( |
| Lockable& m, |
| Func* func, |
| BOOST_FWD_REF(Arg1) arg1, |
| BOOST_FWD_REF(Arg2) arg2, |
| BOOST_FWD_REF(Arg3) arg3, |
| BOOST_FWD_REF(Arg4) arg4 |
| ) { |
| BOOST_STATIC_ASSERT(boost::is_function<Func>::value); |
| |
| boost::lock_guard<Lockable> lock(m); |
| return func( |
| boost::forward<Arg1>(arg1), |
| boost::forward<Arg2>(arg2), |
| boost::forward<Arg3>(arg3), |
| boost::forward<Arg4>(arg4) |
| ); |
| } |
| |
| #endif |
| |
| } // namespace boost |
| |
| #endif // BOOST_THREAD_WITH_LOCK_GUARD_HPP |
| |