Also, it is NOT unrealistic to expect perfect alternation. The definition
of sched_yield in the manpage says that sched_yield() puts the thread under
question last in the run queue. So perfect alternation should have occurred.
I've also tested the code on Solaris - there is perfect alternation there.
- Mohit
-----Original Message-----
From: David Schwartz [mailto:davids@webmaster.com]
Sent: Sunday, February 04, 2001 3:09 AM
To: Mohit Aron; linux-kernel@vger.kernel.org
Subject: RE: system call sched_yield() doesn't work on Linux 2.2
The program you attached worked perfectly for me. You need to
'fflush(stdout);' after each 'printf'. You didn't expect perfect alternation
did you? That's totally unrealistic. You cannot use the scheduler as a
synchronization mechanism.
--Thread1 Thread1 Thread2 Thread1 Thread1 Thread2 Thread1 Thread2 Thread2 Thread2
--DS
> -----Original Message----- > From: linux-kernel-owner@vger.kernel.org > [mailto:linux-kernel-owner@vger.kernel.org]On Behalf Of Mohit Aron > Sent: Saturday, February 03, 2001 2:53 PM > To: linux-kernel@vger.kernel.org > Subject: system call sched_yield() doesn't work on Linux 2.2 > > > Hi, > the system call sched_yield() doesn't seem to work on Linux > 2.2. Does > anyone know of a kernel patch that fixes this ? > > Attached below is a small program that uses pthreads and demonstrates that > sched_yield() doesn't work. Basically, the program creates two > threads that > alternatively try to yield CPU to each other. > > > - Mohit > > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/