Re: Defect in XSH sched_yield

[Joe Gwinn <yyyyy@xxxxxxxxxxxx>]

At 01:44 PM 1/14/2006, yyy@xxxxxxxxx wrote:
>         Defect report from : Howard Chu , Symas Corp.
>
> (Please direct followup comments direct to yyyyyyyyyyyyyy@xxxxxxxxxxxxx)
>
> @ page 0 line 0 section sched_yield objection {1}
>
> Problem:
>
> Edition of Specification (Year): 2004
>
> Defect code :  2. Omission
>
> This function is marked as belonging to both the Processor 
> Scheduling feature group and the Threads feature group. The 
> Description of this function reads:
>
> The sched_yield() function shall force the running thread to 
> relinquish the processor until it again becomes the head of its 
> thread list. It takes no arguments.
>
> However, the concept of thread lists is only defined within the 
> context of Process Scheduling, which is an optional group. If a 
> system implements the Threads feature group without the Process 
> Scheduling group, then the definition/description has no meaning.
>
> Action:
>
> Either the Process Scheduling feature is a required feature when 
> Threads are implemented, or a definition of this function needs to 
> be expressed independently of the "thread list" concept for cases 
> where thread lists are not applicable.
Two places where threads are defined in the absence of processes are 
the smaller two profiles (PSE51 and PSE52) of 1003.13, where the 
whole computer is considered a single implicit process.  So, to not 
interfere with these profiles, sched_yield belongs with Threads, but 
is optional in Process Sceduling.

Joe