SUMO - Simulation of Urban MObility
FXWorkerThread::Pool Class Reference

A pool of worker threads which distributes the tasks and collects the results. More...

#include <FXWorkerThread.h>

Collaboration diagram for FXWorkerThread::Pool:
Collaboration graph

Public Member Functions

void add (Task *const t, int index=-1)
 Gives a number to the given task and assigns it to the worker with the given index. If the index is negative, assign to the next (round robin) one. More...
 
void addFinished (Task *const t)
 Adds the given task to the list of finished tasks and assigns it to a randomly chosen worker. More...
 
void addWorker (FXWorkerThread *const w)
 Adds the given thread to the pool. More...
 
void clear ()
 Stops and deletes all worker threads. More...
 
bool isFull () const
 Checks whether there are currently more pending tasks than threads. More...
 
void lock ()
 locks the pool mutex More...
 
 Pool (int numThreads=0)
 Constructor. More...
 
int size () const
 Returns the number of threads in the pool. More...
 
void unlock ()
 unlocks the pool mutex More...
 
void waitAll (const bool deleteFinished=true)
 waits for all tasks to be finished More...
 
virtual ~Pool ()
 Destructor. More...
 

Private Attributes

FXCondition myCondition
 the semaphore to wait on for finishing all tasks More...
 
std::list< Task * > myFinishedTasks
 list of finished tasks More...
 
FXMutex myMutex
 the internal mutex for the task list More...
 
int myNumFinished
 the number of finished tasks (is reset when the pool runs empty) More...
 
FXMutex myPoolMutex
 the pool mutex for external sync More...
 
int myRunningIndex
 the running index for the next task More...
 
std::vector< FXWorkerThread * > myWorkers
 the current worker threads More...
 

Detailed Description

A pool of worker threads which distributes the tasks and collects the results.

Definition at line 80 of file FXWorkerThread.h.

Constructor & Destructor Documentation

◆ Pool()

FXWorkerThread::Pool::Pool ( int  numThreads = 0)
inline

Constructor.

May initialize the pool with a given number of workers.

Parameters
[in]numThreadsthe number of threads to create

Definition at line 88 of file FXWorkerThread.h.

References FXWorkerThread::FXWorkerThread().

◆ ~Pool()

virtual FXWorkerThread::Pool::~Pool ( )
inlinevirtual

Destructor.

Stopping and deleting all workers by calling clear.

Definition at line 99 of file FXWorkerThread.h.

Member Function Documentation

◆ add()

void FXWorkerThread::Pool::add ( Task *const  t,
int  index = -1 
)
inline

Gives a number to the given task and assigns it to the worker with the given index. If the index is negative, assign to the next (round robin) one.

Parameters
[in]tthe task to add
[in]indexindex of the worker thread to use or -1 for an arbitrary one

Definition at line 127 of file FXWorkerThread.h.

References FXWorkerThread::Task::setIndex().

Referenced by LandmarkLookupTable< E, V >::LandmarkLookupTable().

◆ addFinished()

void FXWorkerThread::Pool::addFinished ( Task *const  t)
inline

Adds the given task to the list of finished tasks and assigns it to a randomly chosen worker.

Locks the internal mutex and counts the finished tasks. This is to be called by the worker thread only.

Parameters
[in]tthe task to add

Definition at line 141 of file FXWorkerThread.h.

References FXWorkerThread::myCondition, and FXWorkerThread::myMutex.

Referenced by FXWorkerThread::run().

◆ addWorker()

void FXWorkerThread::Pool::addWorker ( FXWorkerThread *const  w)
inline

Adds the given thread to the pool.

Parameters
[in]wthe thread to add

Definition at line 116 of file FXWorkerThread.h.

Referenced by FXWorkerThread::FXWorkerThread().

◆ clear()

void FXWorkerThread::Pool::clear ( )
inline

Stops and deletes all worker threads.

Definition at line 105 of file FXWorkerThread.h.

◆ isFull()

bool FXWorkerThread::Pool::isFull ( ) const
inline

Checks whether there are currently more pending tasks than threads.

This is only a rough estimate because the tasks are already assigned and there could be an idle thread even though the number of tasks is large.

Returns
whether there are enough tasks to let all threads work

Definition at line 174 of file FXWorkerThread.h.

◆ lock()

void FXWorkerThread::Pool::lock ( )
inline

locks the pool mutex

Definition at line 187 of file FXWorkerThread.h.

◆ size()

int FXWorkerThread::Pool::size ( ) const
inline

Returns the number of threads in the pool.

Returns
the number of threads

Definition at line 182 of file FXWorkerThread.h.

Referenced by LandmarkLookupTable< E, V >::LandmarkLookupTable().

◆ unlock()

void FXWorkerThread::Pool::unlock ( )
inline

unlocks the pool mutex

Definition at line 192 of file FXWorkerThread.h.

◆ waitAll()

void FXWorkerThread::Pool::waitAll ( const bool  deleteFinished = true)
inline

waits for all tasks to be finished

Definition at line 150 of file FXWorkerThread.h.

References FXWorkerThread::myCondition, and FXWorkerThread::myMutex.

Referenced by LandmarkLookupTable< E, V >::LandmarkLookupTable().

Field Documentation

◆ myCondition

FXCondition FXWorkerThread::Pool::myCondition
private

the semaphore to wait on for finishing all tasks

Definition at line 204 of file FXWorkerThread.h.

◆ myFinishedTasks

std::list<Task*> FXWorkerThread::Pool::myFinishedTasks
private

list of finished tasks

Definition at line 206 of file FXWorkerThread.h.

◆ myMutex

FXMutex FXWorkerThread::Pool::myMutex
private

the internal mutex for the task list

Definition at line 200 of file FXWorkerThread.h.

◆ myNumFinished

int FXWorkerThread::Pool::myNumFinished
private

the number of finished tasks (is reset when the pool runs empty)

Definition at line 210 of file FXWorkerThread.h.

◆ myPoolMutex

FXMutex FXWorkerThread::Pool::myPoolMutex
private

the pool mutex for external sync

Definition at line 202 of file FXWorkerThread.h.

◆ myRunningIndex

int FXWorkerThread::Pool::myRunningIndex
private

the running index for the next task

Definition at line 208 of file FXWorkerThread.h.

◆ myWorkers

std::vector<FXWorkerThread*> FXWorkerThread::Pool::myWorkers
private

the current worker threads

Definition at line 198 of file FXWorkerThread.h.


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