Threads::ConditionVar Class Reference

Is an object that faciliates many threads to wait for something to happen. More...

Inheritance diagram for Threads::ConditionVar:

Public Member Functions
	ConditionVar ()
	ConditionVar (const ConditionVar &)
	~ConditionVar ()
void	signal (bool all)
void	wait ()
bool	wait (unsigned long timeout)
Public Member Functions inherited from Threads::Mutex
	Mutex (bool recursive=false)
	Mutex (const Mutex &)=delete
virtual	~Mutex ()
int	getCount () const
bool	isRecursive () const
void	lock ()
bool	tryLock ()
void	unLock ()

Protected Attributes
QWaitCondition *	cond_
Protected Attributes inherited from Threads::Mutex
int	count_ = 0
	Only set in debug-mode. More...
ThreadID	lockingthread_ = 0
	Only set in debug-mode. More...
QMutex *	qmutex_ = nullptr
QRecursiveMutex *	qrecursivemutex_ = nullptr

Detailed Description

Is an object that faciliates many threads to wait for something to happen.

Usage:

From the working thread

1. lock() You will now be the only one allowed to check weather condition is true (e.g. if new work has arrived).
2. Check condition. If false, call wait(). You will now sleep until someone calls signal(); If you are awakened, check the condition again and go back to sleep if it is false.
3. If condition is true, unLock() and start working. When finished working go back to 1.

It is wise to put an exit flag in the loop, so it's possible to say that we are about to quit.

From the manager: When you want to change the condition:

1. lock
2. set condition (e.g. add more work)
3. signal

4. unLock

   <>

Constructor & Destructor Documentation

ConditionVar() [1/2]

Threads::ConditionVar::ConditionVar

(

)

ConditionVar() [2/2]

Threads::ConditionVar::ConditionVar

(

const ConditionVar &

)

~ConditionVar()

Threads::ConditionVar::~ConditionVar

(

)

Member Function Documentation

signal()

void Threads::ConditionVar::signal

(

bool

all

)

If all is true, all threads that have called wait() will be Notified about the signal. If all is false, only one thread will respond.

wait() [1/2]

void Threads::ConditionVar::wait

(

)

wait() [2/2]

bool Threads::ConditionVar::wait

(

unsigned long

timeout

)

Parameters

timeout

is in milliseconds.

Return values

false

if timeout was hit

Member Data Documentation

cond_

QWaitCondition* Threads::ConditionVar::cond_

protected