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ost::Runlist

NAME

ost::Runlist −

A runlist is used to restrict concurrent exection to a limited set of concurrent sessions, much like a semaphore.

SYNOPSIS

#include <misc.h>

Inherits ost::Mutex.

Public Member Functions

Runlist (unsigned count=1)
Create a new runlist with a specified limit.

bool add (Runable *run)
Add a runable object to this runlist.

void del (Runable *run)
Remove a runable object from the wait list or notify when it is done running so that the used count can be decremented.

void set (unsigned limit)
Set the limit.

Protected Member Functions

void check (void)

Protected Attributes

unsigned limit
unsigned used

Detailed Description

A runlist is used to restrict concurrent exection to a limited set of concurrent sessions, much like a semaphore.

However, the runlist differs in that it notifies objects when they become ready to run, rather than requiring them to wait and ’block’ for the semaphore count to become low enough to continue.

Author:

David Sugar <dyfet AT ostel DOT com> list of runable objects.

Constructor & Destructor Documentation

ost::Runlist::Runlist (unsigned count = 1)
Create a new runlist with a specified limit. Parameters:

count limit before wait queuing.

Member Function Documentation

bool ost::Runlist::add (Runable * run)
Add a runable object to this runlist. If the number of entries running is below the limit, then add returns true otherwise the entry is added to the list.

Returns:

true if immediately ready to run

Parameters:

run pointer to runable object.

void ost::Runlist::check (void) [protected]
void ost::Runlist::del (Runable * run)

Remove a runable object from the wait list or notify when it is done running so that the used count can be decremented. Parameters:

run pointer to runable object.

void ost::Runlist::set (unsigned limit)
Set the limit. Parameters:

limit to use.

Member Data Documentation

unsigned ost::Runlist::limit [protected]
unsigned ost::Runlist::used
[protected]

Author

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