47e
Subj : Re: get num waiters on cv
To   : comp.programming.threads
From : Sree
Date : Mon May 02 2005 08:06 pm


Joe Seigh wrote:
> On Mon, 02 May 2005 18:22:02 +0530, Sree <sree@nowhere.com> wrote:
> 
>> Hi,
>> Is there a way (like say a pthread syscall) to get the number of threads
>> waiting on a cv and mutex? I wish to avoid additional bookkeeping at the
>> application level(like counters) to achieve this.
>>
> Anything not in the pthreads api wouldn't be portable.  Some 
> implementations
> like Linux have that info in userspace if you can figure out your way 
> through
> the opaque data types to get to it but I wouldn't trust the api to be 
> stable
> enough that you could trust code to work accross multiple releases.  And 
> there
> is no such thing as a standard pthread syscall if you're thinking there's
> anything like that.
> 
seems strange considering the info might be kept in a straightforward 
fashion in the kernel data structure. This does look to me like a 
not-so-infrequently desired information, say for resource management or 
in my case, for diagnostics (to detect hopeless waiters).

.

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