System::Condition Class Reference

Condition class provides communication, the ability to wait for some shared resource to reach some desired state, or to signal that it has reached some state in which another thread may be interested. More...

#include <B2BITS_Condition.h>

Public Member Functions
void	broadcast ()
	Broadcasts condition, waking all current waiters. More...
	Condition ()
	Constructor. More...
void	signal ()
	Signals condition, waking one waiting thread. More...
bool	timedWait (OldMutex *apMutex, Long aTimeout)
	Waits on condition, until awaked by a signal or broadcast, or until a specified amount of time has elapsed. More...
void	wait (OldMutex *apMutex)
	Waits on condition, until awakened by a signal or broadcast. More...
	~Condition ()
	Destructor. More...

Detailed Description

Condition class provides communication, the ability to wait for some shared resource to reach some desired state, or to signal that it has reached some state in which another thread may be interested.

Each condition variable is closely associated with a mutex that protects the state of the resource.

Note

A conditional variable wait always returns with the mutex locked.

Warning

Conditional variables are for signaling, not for mutual exclusion.

Note

Conditional variables and thier predicates are "linked" - for best results, treat them that way!

Constructor & Destructor Documentation

System::Condition::Condition

(

)

Constructor.

Exceptions

SystemException

System::Condition::~Condition

(

)

Destructor.

Member Function Documentation

void System::Condition::broadcast

(

)

Broadcasts condition, waking all current waiters.

Note

Use when more than one waiter may respond to predicate change or if any waiting thread may not be able to respond.

Exceptions

SystemException

void System::Condition::signal

(

)

Signals condition, waking one waiting thread.

Note

Use when any waiter can respond, and only one need respond. All waiters are equal.

Exceptions

SystemException

bool System::Condition::timedWait	(	OldMutex *	apMutex,
		Long	aTimeout
	)

Waits on condition, until awaked by a signal or broadcast, or until a specified amount of time has elapsed.

If awaked by a signal or broadcast returns true, otherwise false. The current thread must own specified mutex.

Note

The function shall block on a condition variable. It shall be called with mutex locked by the calling thread or undefined behavior results. Upon successful return, the mutex shall have been locked and shall be owned by the calling thread.

Parameters

aTimeout

the maximum time to wait in milliseconds.

Exceptions

SystemException

void System::Condition::wait

(

OldMutex *

apMutex

)

Waits on condition, until awakened by a signal or broadcast.

The current thread must own specified mutex.

Exceptions

SystemException

Note

The function shall block on a condition variable. It shall be called with mutex locked by the calling thread or undefined behavior results. Upon successful return, the mutex shall have been locked and shall be owned by the calling thread.