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future (_State_baseV2::_M_set_result): Pass pointers to _M_do_set.

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* include/std/future (_State_baseV2::_M_set_result): Pass pointers to
	_M_do_set.
	(_State_baseV2::_M_do_set): Change parameters to pointers.
	(_State_baseV2::_Setter): Change _M_arg from reference to pointer.
	(_State_baseV2::__setter): Initialize _Setter with pointers.
	(_State_baseV2::__setter(promise<void>*)): Remove overload.
	(promise::set_value, promise::set_exception): Pass setter directly
	to _M_set_result.
	(_State_baseV2::_Task_setter): Add template parameter for callable
	type and replace std::function member with pointer to that type.
	Change _M_result member from reference to pointer.
	(_State_baseV2::_S_task_setter): Change parameter to lvalue reference
	and initialize _Task_setter with pointers.
	(__location_invariant): Specialize for _Setter and _Task_setter.

From-SVN: r213737
This commit is contained in:
Jonathan Wakely 2014-08-07 21:13:52 +01:00 committed by Jonathan Wakely
parent 2d45625fa7
commit 4e48c10968
2 changed files with 66 additions and 71 deletions
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15
libstdc++-v3/ChangeLog
View File

@ -11,6 +11,21 @@
* testsuite/23_containers/list/requirements/dr438/insert_neg.cc:
Likewise.
* include/std/future (_State_baseV2::_M_set_result): Pass pointers to
_M_do_set.
(_State_baseV2::_M_do_set): Change parameters to pointers.
(_State_baseV2::_Setter): Change _M_arg from reference to pointer.
(_State_baseV2::__setter): Initialize _Setter with pointers.
(_State_baseV2::__setter(promise<void>*)): Remove overload.
(promise::set_value, promise::set_exception): Pass setter directly
to _M_set_result.
(_State_baseV2::_Task_setter): Add template parameter for callable
type and replace std::function member with pointer to that type.
Change _M_result member from reference to pointer.
(_State_baseV2::_S_task_setter): Change parameter to lvalue reference
and initialize _Task_setter with pointers.
(__location_invariant): Specialize for _Setter and _Task_setter.
2014-08-02 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/15339

120
libstdc++-v3/include/std/future
View File

@ -358,7 +358,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// all calls to this function are serialized,
// side-effects of invoking __res only happen once
call_once(_M_once, &_State_baseV2::_M_do_set, this,
ref(__res), ref(__lock));
std::__addressof(__res), std::__addressof(__lock));
if (__lock.owns_lock())
_M_cond.notify_all();
else if (!__ignore_failure)
@ -396,7 +396,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
struct _Setter<_Res, _Arg&>
{
// check this is only used by promise<R>::set_value(const R&)
// or promise<R>::set_value(R&)
// or promise<R&>::set_value(R&)
static_assert(is_same<_Res, _Arg&>::value // promise<R&>
|| is_same<const _Res, _Arg>::value, // promise<R>
"Invalid specialisation");
@ -404,11 +404,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
typename promise<_Res>::_Ptr_type operator()()
{
_State_baseV2::_S_check(_M_promise->_M_future);
_M_promise->_M_storage->_M_set(_M_arg);
_M_promise->_M_storage->_M_set(*_M_arg);
return std::move(_M_promise->_M_storage);
}
promise<_Res>* _M_promise;
_Arg& _M_arg;
_Arg* _M_arg;
};
// set rvalues
@ -418,11 +418,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
typename promise<_Res>::_Ptr_type operator()()
{
_State_baseV2::_S_check(_M_promise->_M_future);
_M_promise->_M_storage->_M_set(std::move(_M_arg));
_M_promise->_M_storage->_M_set(std::move(*_M_arg));
return std::move(_M_promise->_M_storage);
}
promise<_Res>* _M_promise;
_Res& _M_arg;
_Res* _M_arg;
};
struct __exception_ptr_tag { };
@ -434,31 +434,28 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
typename promise<_Res>::_Ptr_type operator()()
{
_State_baseV2::_S_check(_M_promise->_M_future);
_M_promise->_M_storage->_M_error = _M_ex;
_M_promise->_M_storage->_M_error = *_M_ex;
return std::move(_M_promise->_M_storage);
}
promise<_Res>* _M_promise;
exception_ptr& _M_ex;
exception_ptr* _M_ex;
};
template<typename _Res, typename _Arg>
static _Setter<_Res, _Arg&&>
__setter(promise<_Res>* __prom, _Arg&& __arg)
{
return _Setter<_Res, _Arg&&>{ __prom, __arg };
return _Setter<_Res, _Arg&&>{ __prom, &__arg };
}
template<typename _Res>
static _Setter<_Res, __exception_ptr_tag>
__setter(exception_ptr& __ex, promise<_Res>* __prom)
{
return _Setter<_Res, __exception_ptr_tag>{ __prom, __ex };
return _Setter<_Res, __exception_ptr_tag>{ __prom, &__ex };
}
static _Setter<void, void>
__setter(promise<void>* __prom);
template<typename _Tp>
static void
_S_check(const shared_ptr<_Tp>& __p)
@ -469,10 +466,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
private:
void
_M_do_set(function<_Ptr_type()>& __f, unique_lock<mutex>& __lock)
_M_do_set(function<_Ptr_type()>* __f, unique_lock<mutex>* __lock)
{
_Ptr_type __res = __f(); // do not hold lock while running setter
__lock.lock();
_Ptr_type __res = (*__f)(); // do not hold lock while running setter
__lock->lock();
_M_result.swap(__res);
}
@ -514,15 +511,15 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
static std::shared_ptr<_State_base>
_S_make_async_state(_BoundFn&& __fn);
template<typename _Res_ptr,
template<typename _Res_ptr, typename _Fn,
typename _Res = typename _Res_ptr::element_type::result_type>
struct _Task_setter;
template<typename _Res_ptr, typename _BoundFn>
static _Task_setter<_Res_ptr>
_S_task_setter(_Res_ptr& __ptr, _BoundFn&& __call)
static _Task_setter<_Res_ptr, _BoundFn>
_S_task_setter(_Res_ptr& __ptr, _BoundFn& __call)
{
return _Task_setter<_Res_ptr>{ __ptr, std::ref(__call) };
return { std::__addressof(__ptr), std::__addressof(__call) };
}
};
@ -554,6 +551,18 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
void _M_destroy() { delete this; }
};
// Allow _Setter objects to be stored locally in std::function
template<typename _Res, typename _Arg>
struct __is_location_invariant
<__future_base::_State_base::_Setter<_Res, _Arg>>
: true_type { };
// Allow _Task_setter objects to be stored locally in std::function
template<typename _Res_ptr, typename _Fn, typename _Res>
struct __is_location_invariant
<__future_base::_Task_setter<_Res_ptr, _Fn, _Res>>
: true_type { };
#ifndef _GLIBCXX_ASYNC_ABI_COMPAT
/// Common implementation for future and shared_future.
@ -994,24 +1003,15 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// Setting the result
void
set_value(const _Res& __r)
{
auto __setter = _State::__setter(this, __r);
_M_future->_M_set_result(std::move(__setter));
}
{ _M_future->_M_set_result(_State::__setter(this, __r)); }
void
set_value(_Res&& __r)
{
auto __setter = _State::__setter(this, std::move(__r));
_M_future->_M_set_result(std::move(__setter));
}
{ _M_future->_M_set_result(_State::__setter(this, std::move(__r))); }
void
set_exception(exception_ptr __p)
{
auto __setter = _State::__setter(__p, this);
_M_future->_M_set_result(std::move(__setter));
}
{ _M_future->_M_set_result(_State::__setter(__p, this)); }
};
template<typename _Res>
@ -1092,17 +1092,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// Setting the result
void
set_value(_Res& __r)
{
auto __setter = _State::__setter(this, __r);
_M_future->_M_set_result(std::move(__setter));
}
{ _M_future->_M_set_result(_State::__setter(this, __r)); }
void
set_exception(exception_ptr __p)
{
auto __setter = _State::__setter(__p, this);
_M_future->_M_set_result(std::move(__setter));
}
{ _M_future->_M_set_result(_State::__setter(__p, this)); }
};
/// Explicit specialization for promise<void>
@ -1177,10 +1171,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
void
set_exception(exception_ptr __p)
{
auto __setter = _State::__setter(__p, this);
_M_future->_M_set_result(std::move(__setter));
}
{ _M_future->_M_set_result(_State::__setter(__p, this)); }
};
// set void
@ -1196,28 +1187,18 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
promise<void>* _M_promise;
};
inline __future_base::_State_base::_Setter<void, void>
__future_base::_State_base::__setter(promise<void>* __prom)
{
return _Setter<void, void>{ __prom };
}
inline void
promise<void>::set_value()
{
auto __setter = _State::__setter(this);
_M_future->_M_set_result(std::move(__setter));
}
{ _M_future->_M_set_result(_State::_Setter<void, void>{ this }); }
template<typename _Ptr_type, typename _Res>
template<typename _Ptr_type, typename _Fn, typename _Res>
struct __future_base::_Task_setter
{
_Ptr_type operator()()
{
__try
{
_M_result->_M_set(_M_fn());
(*_M_result)->_M_set((*_M_fn)());
}
__catch(const __cxxabiv1::__forced_unwind&)
{
@ -1225,22 +1206,22 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
}
__catch(...)
{
_M_result->_M_error = current_exception();
(*_M_result)->_M_error = current_exception();
}
return std::move(_M_result);
return std::move(*_M_result);
}
_Ptr_type& _M_result;
std::function<_Res()> _M_fn;
_Ptr_type* _M_result;
_Fn* _M_fn;
};
template<typename _Ptr_type>
struct __future_base::_Task_setter<_Ptr_type, void>
template<typename _Ptr_type, typename _Fn>
struct __future_base::_Task_setter<_Ptr_type, _Fn, void>
{
_Ptr_type operator()()
{
__try
{
_M_fn();
(*_M_fn)();
}
__catch(const __cxxabiv1::__forced_unwind&)
{
@ -1248,12 +1229,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
}
__catch(...)
{
_M_result->_M_error = current_exception();
(*_M_result)->_M_error = current_exception();
}
return std::move(_M_result);
return std::move(*_M_result);
}
_Ptr_type& _M_result;
std::function<void()> _M_fn;
_Ptr_type* _M_result;
_Fn* _M_fn;
};
template<typename _Res, typename... _Args>
@ -1294,8 +1275,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// bound arguments decay so wrap lvalue references
auto __boundfn = std::__bind_simple(std::ref(_M_impl._M_fn),
_S_maybe_wrap_ref(std::forward<_Args>(__args))...);
auto __setter = _S_task_setter(this->_M_result, std::move(__boundfn));
this->_M_set_result(std::move(__setter));
this->_M_set_result(_S_task_setter(this->_M_result, __boundfn));
}
virtual shared_ptr<_Task_state_base<_Res(_Args...)>>