CScheduler Class Reference

Simple class for background tasks that should be run periodically or once "after a while". More...

#include <scheduler.h>

Collaboration diagram for CScheduler:

Public Types
typedef std::function< void()>	Function

Public Member Functions
	CScheduler ()
	~CScheduler ()
void	schedule (Function f, std::chrono::system_clock::time_point t)
	Call func at/after time t. More...
void	scheduleFromNow (Function f, std::chrono::milliseconds delta)
	Call f once after the delta has passed. More...
void	scheduleEvery (Function f, std::chrono::milliseconds delta)
	Repeat f until the scheduler is stopped. More...
void	MockForward (std::chrono::seconds delta_seconds)
	Mock the scheduler to fast forward in time. More...
void	serviceQueue ()
	Services the queue 'forever'. More...
void	stop ()
	Tell any threads running serviceQueue to stop as soon as the current task is done. More...
void	StopWhenDrained ()
	Tell any threads running serviceQueue to stop when there is no work left to be done. More...
size_t	getQueueInfo (std::chrono::system_clock::time_point &first, std::chrono::system_clock::time_point &last) const
	Returns number of tasks waiting to be serviced, and first and last task times. More...
bool	AreThreadsServicingQueue () const
	Returns true if there are threads actively running in serviceQueue() More...

Private Member Functions
std::multimap< std::chrono::system_clock::time_point, Function > taskQueue	GUARDED_BY (newTaskMutex)
int nThreadsServicingQueue	GUARDED_BY (newTaskMutex)
bool stopRequested	GUARDED_BY (newTaskMutex)
bool stopWhenEmpty	GUARDED_BY (newTaskMutex)
bool	shouldStop () const EXCLUSIVE_LOCKS_REQUIRED(newTaskMutex)

Private Attributes
Mutex	newTaskMutex
std::condition_variable	newTaskScheduled

Detailed Description

Simple class for background tasks that should be run periodically or once "after a while".

Usage:

CScheduler* s = new CScheduler(); s->scheduleFromNow(doSomething, std::chrono::milliseconds{11}); // Assuming a: void doSomething() { } s->scheduleFromNow([=] { this->func(argument); }, std::chrono::milliseconds{3}); std::thread* t = new std::thread([&] { s->serviceQueue(); });

... then at program shutdown, make sure to call stop() to clean up the thread(s) running serviceQueue: s->stop(); t->join(); delete t; delete s; // Must be done after thread is interrupted/joined.

Definition at line 32 of file scheduler.h.

Member Typedef Documentation

Function

typedef std::function<void()> CScheduler::Function

Definition at line 38 of file scheduler.h.

Constructor & Destructor Documentation

CScheduler()

CScheduler::CScheduler

(

)

Definition at line 12 of file scheduler.cpp.

~CScheduler()

CScheduler::~CScheduler

(

)

Definition at line 16 of file scheduler.cpp.

Member Function Documentation

AreThreadsServicingQueue()

bool CScheduler::AreThreadsServicingQueue

(

)

const

Returns true if there are threads actively running in serviceQueue()

Definition at line 125 of file scheduler.cpp.

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getQueueInfo()

size_t CScheduler::getQueueInfo	(	std::chrono::system_clock::time_point &	first,
		std::chrono::system_clock::time_point &	last
	)		const

Returns number of tasks waiting to be serviced, and first and last task times.

Definition at line 113 of file scheduler.cpp.

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GUARDED_BY() [1/4]

std::multimap<std::chrono::system_clock::time_point, Function> taskQueue CScheduler::GUARDED_BY ( newTaskMutex  )

private

GUARDED_BY() [2/4]

int nThreadsServicingQueue CScheduler::GUARDED_BY ( newTaskMutex  )

inlineprivate

Definition at line 97 of file scheduler.h.

GUARDED_BY() [3/4]

bool stopRequested CScheduler::GUARDED_BY ( newTaskMutex  )

inlineprivate

Definition at line 98 of file scheduler.h.

GUARDED_BY() [4/4]

bool stopWhenEmpty CScheduler::GUARDED_BY ( newTaskMutex  )

inlineprivate

Definition at line 99 of file scheduler.h.

MockForward()

void CScheduler::MockForward

(

std::chrono::seconds

delta_seconds

)

Mock the scheduler to fast forward in time.

Iterates through items on taskQueue and reschedules them to be delta_seconds sooner.

Definition at line 80 of file scheduler.cpp.

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schedule()

void CScheduler::schedule	(	CScheduler::Function	f,
		std::chrono::system_clock::time_point	t
	)

Call func at/after time t.

Definition at line 71 of file scheduler.cpp.

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scheduleEvery()

void CScheduler::scheduleEvery	(	CScheduler::Function	f,
		std::chrono::milliseconds	delta
	)

Repeat f until the scheduler is stopped.

First run is after delta has passed once.

The timing is not exact: Every time f is finished, it is rescheduled to run again after delta. If you need more accurate scheduling, don't use this method.

Definition at line 108 of file scheduler.cpp.

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scheduleFromNow()

void CScheduler::scheduleFromNow ( Function  f, std::chrono::milliseconds  delta  )

inline

Call f once after the delta has passed.

Definition at line 44 of file scheduler.h.

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serviceQueue()

void CScheduler::serviceQueue

(

)

Services the queue 'forever'.

Should be run in a thread, and interrupted using boost::interrupt_thread

Definition at line 23 of file scheduler.cpp.

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shouldStop()

bool CScheduler::shouldStop ( ) const

inlineprivate

Definition at line 100 of file scheduler.h.

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stop()

void CScheduler::stop ( )

inline

Tell any threads running serviceQueue to stop as soon as the current task is done.

Definition at line 71 of file scheduler.h.

StopWhenDrained()

void CScheduler::StopWhenDrained ( )

inline

Tell any threads running serviceQueue to stop when there is no work left to be done.

Definition at line 77 of file scheduler.h.

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Member Data Documentation

newTaskMutex

Mutex CScheduler::newTaskMutex

mutableprivate

Definition at line 94 of file scheduler.h.

newTaskScheduled

std::condition_variable CScheduler::newTaskScheduled

private

Definition at line 95 of file scheduler.h.

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

• src/scheduler.h
• src/scheduler.cpp