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
Additional Inherited Members
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 [email protected]
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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