Subject: Re: posix semaphores and libpthread
To: Anthony Mallet <>
From: Jaromir Dolecek <>
List: current-users
Date: 02/02/2003 21:36:37
Since you are using nonshared semaphore and sem_wait(), how'd
you ever get wakeup from the call?

I assume that the semaphore is nonshared by seeing that
you hit the preempt condition, which is only hit for USEM_USER
semaphores. USEM_USER is set when sem_init() is called
with pshared == 0, so I'm assuming you do just that. If you
expect the semaphore to be posted from other process, you
ought to sem_init() it with pshared == 1 ...


Anthony Mallet wrote:
> I still have some trouble with posix semaphores in libpthread.
> Calling sem_wait when no thread has been created triggers this:
> assertion "next != 0" failed: file "/home/src/netbsd-current/lib/libpthread/pthread_run.c", line 118, function "pthread__next"
> Shoud I send-pr?
> Or am I wrong in trying do to this?
> Or is it a known issue :) ?

Jaromir Dolecek <>  
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