Subj : pthread_timed_wait
To   : comp.programming.threads
From : Michael H Lees
Date : Wed Jun 01 2005 02:53 pm

Hi,

I'm using the LinuxThreads implementation of pthreads and I'm having 
trouble working out the precise meaning of the documentation.

From 
http://www.opengroup.org/onlinepubs/009695399/functions/pthread_cond_timedwait.html
....<snip>
The /pthread_cond_timedwait/() function shall be equivalent to 
/pthread_cond_wait/(), except that an error is returned if the absolute 
time specified by /abstime/ passes (that is, system time equals or 
exceeds /abstime/) before the condition /cond/ is signaled or 
broadcasted, or if the absolute time specified by /abstime/ has already 
been passed at the time of the call.
<snip>...

I assume this means if ptherad_cond_timedwait is called with an absolute 
time before the current time then the error code ETIMEOUT is returned? 
(same as normal timeout)

However, I don't know if it's my implementation but if I call timed wait 
with a time in the past the function returns EINVAL.
 From the documentation EINVAL is returned if the abstime passed is invalid.

Is a abstime less than the system time an invalid time?

Thanks

-Mike

.