Threads::TaskGroup< RT > Class Template Reference

#include <deal.II/base/thread_management.h>

Public Member Functions
TaskGroup &	operator+= (const Task< RT > &t)
std::size_t	size () const
std::vector< RT >	return_values ()
void	join_all () const

Private Attributes
std::list< Task< RT > >	tasks

Detailed Description

template<typename RT = void>
class Threads::TaskGroup< RT >

A container for task objects. Allows to add new task objects and wait for them all together. The task objects need to have the same return value for the called function.

Note that the call to join_all() must be executed on the same thread as the calls that add subtasks. Otherwise, there might be a deadlock. In other words, a Task object should never passed on to another task for calling the join() method.

Definition at line 1372 of file thread_management.h.

Member Function Documentation

operator+=()

template<typename RT = void>

TaskGroup & Threads::TaskGroup< RT >::operator+= ( const Task< RT > & t )

inline

Add another task object to the collection.

Definition at line 1379 of file thread_management.h.

size()

template<typename RT = void>

std::size_t Threads::TaskGroup< RT >::size ( ) const

inline

Return how many tasks have been put into this group. This function does not distinguish how many of these tasks have already run and have finished, are still waiting to be scheduled to a CPU resource, or are currently running. Tasks that have been joined already are also still counted.

Definition at line 1394 of file thread_management.h.

return_values()

template<typename RT = void>

std::vector< RT > Threads::TaskGroup< RT >::return_values ( )

inline

Return a vector of objects that contain the return values of the tasks contained in this group. This function can obviously only return once all tasks are completed.

The returned vector contains the returned values of tasks in the same order in which these tasks were added to the task group.

Note

This function only makes sense if RT is an actual data type, rather than void. If the TaskGroup stores tasks that have no return value, then you should simply call join_all(), which also waits for all tasks to finish.

Definition at line 1414 of file thread_management.h.

join_all()

template<typename RT = void>

void Threads::TaskGroup< RT >::join_all ( ) const

inline

Wait for all tasks in the collection to finish. It is not a problem if some of them have already been waited for, i.e. you may call this function more than once, and you can also add new task objects between subsequent calls to this function if you want.

Definition at line 1431 of file thread_management.h.

Member Data Documentation

tasks

template<typename RT = void>

std::list<Task<RT> > Threads::TaskGroup< RT >::tasks

private

List of task objects.

Definition at line 1441 of file thread_management.h.

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The documentation for this class was generated from the following file:

• include/deal.II/base/thread_management.h