16#ifndef dealii_thread_management_h
17# define dealii_thread_management_h
28# include <condition_variable>
120 template <
typename ForwardIterator>
121 std::vector<std::pair<ForwardIterator, ForwardIterator>>
123 const ForwardIterator &
end,
124 const unsigned int n_intervals);
134 std::vector<std::pair<unsigned int, unsigned int>>
136 const unsigned int end,
137 const unsigned int n_intervals);
189 template <
typename ForwardIterator>
190 std::vector<std::pair<ForwardIterator, ForwardIterator>>
192 const ForwardIterator &
end,
193 const unsigned int n_intervals)
195 using IteratorPair = std::pair<ForwardIterator, ForwardIterator>;
201 if (n_intervals == 1)
202 return (std::vector<IteratorPair>(1, IteratorPair(
begin,
end)));
205 const unsigned int n_elements = std::distance(
begin,
end);
206 const unsigned int n_elements_per_interval = n_elements / n_intervals;
207 const unsigned int residual = n_elements % n_intervals;
209 std::vector<IteratorPair> return_values(n_intervals);
211 return_values[0].first =
begin;
212 for (
unsigned int i = 0; i < n_intervals; ++i)
214 if (i != n_intervals - 1)
216 return_values[i].second = return_values[i].first;
222 static_cast<signed int>(n_elements_per_interval));
226 ++return_values[i].second;
228 return_values[i + 1].first = return_values[i].second;
231 return_values[i].second =
end;
233 return return_values;
261 template <
typename RT>
283 value = std::move(v);
289 value = std::move(v.get());
313 template <
typename RT>
326 inline reference_type
384 template <
typename RT>
386 call(
const std::function<RT()> & function,
389 ret_val.
set(function());
414 template <
typename RT>
494 start(
const std::function<RT()> &function)
497 ret_val = std::make_shared<return_value<RT>>();
540 catch (
const std::exception &exc)
579 template <
typename RT =
void>
587 Thread(
const std::function<RT()> &function)
713 template <
typename T>
732 template <
typename T>
735 static std::reference_wrapper<T>
755 template <
typename RT>
828 template <
typename FunctionObjectType>
831 ->
Thread<
decltype(function_object())>
833 using return_type =
decltype(function_object());
845 template <
typename RT,
typename... Args>
851 [dummy, fun_ptr]() -> RT {
return std_cxx17::apply(fun_ptr, dummy); });
861 template <
typename RT,
typename C,
typename... Args>
868 return new_thread(std::function<RT()>(std::bind(
877 template <
typename RT,
typename C,
typename... Args>
884 return new_thread(std::function<RT()>(std::bind(
899 template <
typename RT =
void>
909 threads.push_back(t);
922 for (
typename std::list<
Thread<RT>>::const_iterator t = threads.begin();
941 template <
typename RT,
typename Function>
945 promise.set_value(function());
956 template <
typename Function>
993 template <
typename RT =
void>
1008 Task(
const std::function<RT()> &function_object)
1012 std::async(std::launch::async, function_object));
1025 std::promise<RT> promise;
1026 task_data = std::make_shared<TaskData>(promise.get_future());
1036 promise.set_exception(std::current_exception());
1184 "The current object is not associated with a task that "
1185 "can be joined. It may have been detached, or you "
1186 "may have already joined it in the past.");
1225 std::lock_guard<std::mutex> lock(
mutex);
1326 template <
typename RT>
1410 template <
typename FunctionObjectType>
1413 ->
Task<
decltype(function_object())>
1415 using return_type =
decltype(function_object());
1417 return new_task(std::function<return_type()>(function_object));
1428 template <
typename RT,
typename... Args>
1434 [dummy, fun_ptr]() -> RT {
return std_cxx17::apply(fun_ptr, dummy); });
1445 template <
typename RT,
typename C,
typename... Args>
1452 return new_task(std::function<RT()>(std::bind(
1462 template <
typename RT,
typename C,
typename... Args>
1469 return new_task(std::function<RT()>(std::bind(
1488 template <
typename RT =
void>
1513 return tasks.size();
1526 for (
auto &t :
tasks)
static void initialize_multithreading()
static unsigned int n_threads()
Mutex & operator=(const Mutex &)
internal::return_value< RT >::reference_type return_value()
Task(const std::function< RT()> &function_object)
std::list< Thread< RT > > threads
ThreadGroup & operator+=(const Thread< RT > &t)
Thread(const std::function< RT()> &function)
internal::return_value< RT >::reference_type return_value()
std::shared_ptr< internal::ThreadDescriptor< RT > > thread_descriptor
bool operator==(const Thread &t) const
Thread(const Thread< RT > &t)
#define DEAL_II_NAMESPACE_OPEN
#define DEAL_II_DEPRECATED_EARLY
#define DEAL_II_NAMESPACE_CLOSE
static ::ExceptionBase & ExcNoTask()
TaskGroup & operator+=(const Task< RT > &t)
std::shared_ptr< TaskData > task_data
#define Assert(cond, exc)
std::atomic< bool > task_has_finished
internal::return_value< RT > returned_object
std::list< Task< RT > > tasks
TaskData(std::future< RT > &&future)
#define DeclExceptionMsg(Exception, defaulttext)
static ::ExceptionBase & ExcInternalError()
internal::return_value< RT >::reference_type get()
#define AssertThrow(cond, exc)
std::vector< std::pair< ForwardIterator, ForwardIterator > > split_range(const ForwardIterator &begin, const ForwardIterator &end, const unsigned int n_intervals)
Thread< RT > new_thread(const std::function< RT()> &function)
Task< RT > new_task(const std::function< RT()> &function)
std::vector< std::pair< unsigned int, unsigned int > > split_interval(const unsigned int begin, const unsigned int end, const unsigned int n_intervals)
SymmetricTensor< 2, dim, Number > C(const Tensor< 2, dim, Number > &F)
void handle_unknown_exception()
void evaluate_and_set_promise(Function &function, std::promise< RT > &promise)
void call(const std::function< RT()> &function, internal::return_value< RT > &ret_val)
void handle_std_exception(const std::exception &exc)
VectorType::value_type * end(VectorType &V)
VectorType::value_type * begin(VectorType &V)
Mutex thread_is_active_mutex
std::shared_ptr< return_value< RT > > ret_val
std::atomic< bool > thread_is_active
void start(const std::function< RT()> &function)
static void thread_entry_point(const std::function< RT()> &function, std::shared_ptr< return_value< RT > > ret_val)
static std::reference_wrapper< T > act(T &t)
reference_type get() const
void set_from(std::future< RT & > &v)
void set_from(std::future< void > &)
void set_from(std::future< RT > &v)
void advance(std::tuple< I1, I2 > &t, const unsigned int n)