quickpool::ThreadPool Class Reference

A work stealing thread pool. More...

#include <quickpool.hpp>

Public Member Functions
	ThreadPool (size_t threads=sched::num_cores_avail())
	constructs a thread pool. More...
	ThreadPool (ThreadPool &&)=delete
	ThreadPool (const ThreadPool &)=delete
ThreadPool &	operator= (const ThreadPool &)=delete
ThreadPool &	operator= (ThreadPool &&other)=delete
void	set_active_threads (size_t threads)
	sets the number of active worker threads in the thread pool. More...
size_t	get_active_threads () const
	retrieves the number of active worker threads in the thread pool.
template<class Function , class... Args>
void	push (Function &&f, Args &&... args)
	pushes a job to the thread pool. More...
template<class Function , class... Args>
auto	async (Function &&f, Args &&... args) -> std::future< decltype(f(args...))>
	executes a job asynchronously on the global thread pool. More...
template<class UnaryFunction >
void	parallel_for (int begin, int end, UnaryFunction f)
	computes an index-based parallel for loop. More...
template<class Items , class UnaryFunction >
void	parallel_for_each (Items &items, UnaryFunction f)
	computes a iterator-based parallel for loop. More...
void	wait (size_t millis=0)
	waits for all jobs currently running on the thread pool. Has no effect when called from threads other than the one that created the pool. More...
bool	done () const
	checks whether all jobs are done.

Static Public Member Functions
static ThreadPool &	global_instance ()
	returns a reference to the global thread pool instance.
static void *	operator new (size_t count)
	allocator respecting memory alignment.
static void	operator delete (void *ptr)
	deallocator respecting memory alignment.

Detailed Description

A work stealing thread pool.

Definition at line 796 of file quickpool.hpp.

Constructor & Destructor Documentation

ThreadPool()

quickpool::ThreadPool::ThreadPool ( size_t  threads = sched::num_cores_avail() )

inlineexplicit

constructs a thread pool.

Parameters

threads

number of worker threads to create; defaults to number of available (virtual) hardware cores.

Definition at line 802 of file quickpool.hpp.

Member Function Documentation

async()

template<class Function , class... Args>

auto quickpool::ThreadPool::async ( Function &&  f, Args &&...  args  ) -> std::future<decltype(f(args...))>

inline

executes a job asynchronously on the global thread pool.

Parameters

f	a function.
args	(optional) arguments passed to f.

Returns

A std::future for the task. Call future.get() to retrieve the results at a later point in time (blocking).

Definition at line 881 of file quickpool.hpp.

parallel_for()

template<class UnaryFunction >

void quickpool::ThreadPool::parallel_for ( int  begin, int  end, UnaryFunction  f  )

inline

computes an index-based parallel for loop.

Waits until all tasks have finished, unless called from a thread that didn't create the pool. If this is taken into account, parallel loops can be nested.

Parameters

begin	first index of the loop.
end	the loop runs in the range [begin, end).
f	a function taking int argument (the 'loop body').

Definition at line 902 of file quickpool.hpp.

parallel_for_each()

template<class Items , class UnaryFunction >

void quickpool::ThreadPool::parallel_for_each ( Items &  items, UnaryFunction  f  )

inline

computes a iterator-based parallel for loop.

Waits until all tasks have finished, unless called from a thread that didn't create the pool. If this is taken into account, parallel loops can be nested.

Parameters

items	an object allowing for std::begin() and std::end().
f	function to be applied as f(*it) for the iterator in the range [begin, end) (the 'loop body').

Definition at line 924 of file quickpool.hpp.

push()

template<class Function , class... Args>

void quickpool::ThreadPool::push ( Function &&  f, Args &&...  args  )

inline

pushes a job to the thread pool.

Parameters

f	a function.
args	(optional) arguments passed to f.

Definition at line 867 of file quickpool.hpp.

set_active_threads()

void quickpool::ThreadPool::set_active_threads ( size_t  threads )

inline

sets the number of active worker threads in the thread pool.

Parameters

threads

the number of worker threads. Has no effect when not called from owner thread.

Definition at line 836 of file quickpool.hpp.

wait()

void quickpool::ThreadPool::wait ( size_t  millis = 0 )

inline

waits for all jobs currently running on the thread pool. Has no effect when called from threads other than the one that created the pool.

Parameters

millis

if > 0: stops waiting after millis ms.

Definition at line 935 of file quickpool.hpp.

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

• quickpool.hpp