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

Public Attributes
std::thread	m_service_thread

Private Member Functions
std::multimap< std::chrono::steady_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 39 of file scheduler.h.

Member Typedef Documentation

Function

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

Definition at line 47 of file scheduler.h.

Constructor & Destructor Documentation

CScheduler()

CScheduler::CScheduler ( )

default

~CScheduler()

CScheduler::~CScheduler

(

)

Definition at line 16 of file scheduler.cpp.

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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::steady_clock::time_point &	first,
		std::chrono::steady_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::steady_clock::time_point, Function > taskQueue CScheduler::GUARDED_BY ( newTaskMutex  )

private

GUARDED_BY() [2/4]

int nThreadsServicingQueue CScheduler::GUARDED_BY ( newTaskMutex  )

inlineprivate

Definition at line 108 of file scheduler.h.

GUARDED_BY() [3/4]

bool stopRequested CScheduler::GUARDED_BY ( newTaskMutex  )

inlineprivate

Definition at line 109 of file scheduler.h.

GUARDED_BY() [4/4]

bool stopWhenEmpty CScheduler::GUARDED_BY ( newTaskMutex  )

inlineprivate

Definition at line 110 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::steady_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 53 of file scheduler.h.

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serviceQueue()

void CScheduler::serviceQueue

(

)

Services the queue 'forever'.

Should be run in a thread.

Definition at line 23 of file scheduler.cpp.

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shouldStop()

bool CScheduler::shouldStop ( ) const

inlineprivate

Definition at line 111 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 79 of file scheduler.h.

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StopWhenDrained()

void CScheduler::StopWhenDrained ( )

inline

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

Definition at line 86 of file scheduler.h.

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Member Data Documentation

m_service_thread

std::thread CScheduler::m_service_thread

Definition at line 45 of file scheduler.h.

newTaskMutex

Mutex CScheduler::newTaskMutex

mutableprivate

Definition at line 105 of file scheduler.h.

newTaskScheduled

std::condition_variable CScheduler::newTaskScheduled

private

Definition at line 106 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