Aufgabe 7: Anwendung

Static Public Member Functions | List of all members
Bellringer Class Reference
IPC Subsystem

Manages and activates time-triggered activities. More...

#include <sync/bellringer.h>

Static Public Member Functions

static void check ()
 Checks whether there are bells to be rung. More...
 
static void job (Bell *bell, unsigned int ms)
 Passes a bell to the bellringer to be rung after ms milliseconds. More...
 
static void cancel (Bell *bell)
 Cancel ticking & ringing a bell. More...
 
static unsigned int residual (Bell *bell)
 Returns the remaining time until bell will ring. More...
 
static bool bellPending ()
 Checks whether there are enqueued bells. More...
 

Detailed Description

Manages and activates time-triggered activities.

The Bellringer is regularly activated and checks whether any of the bells should ring. The bells are stored in a Queue<Bell> that is managed by the Bellringer. A clever implementation avoids iterating through the whole list for every iteration by keeping the bells sorted and storing delta times. This approach leads to a complexity of O(1) for the method called by the timer interrupt in case no bells need to be rung.

Member Function Documentation

void Bellringer::check ( )
static

Checks whether there are bells to be rung.

Every call to check elapses a tick. Once such a tick reduces a bells remaining time to zero, the bell will be rung.

void Bellringer::job ( Bell *  bell,
unsigned int  ms 
)
static

Passes a bell to the bellringer to be rung after ms milliseconds.

Parameters
bellBell that should be rung after ms milliseconds
msnumber of milliseconds that should be waited before ringing the bell
void Bellringer::cancel ( Bell *  bell)
static

Cancel ticking & ringing a bell.

Parameters
bellBell that should not be rung.
unsigned int Bellringer::residual ( Bell *  bell)
static

Returns the remaining time until bell will ring.

Parameters
bellThe bell for which the remaining time should be returned
Returns
Remaining time in milliseconds
Optional:
Implement Method
bool Bellringer::bellPending ( )
static

Checks whether there are enqueued bells.

Returns
true if there are enqueued bells, false otherwise
The documentation for this class was generated from the following files: