Fair critical section (Linux)

Question

On a multi-threaded Linux application I use a mutex for critical sections. This works very well except for the fairness issue. It can happen that a thread leaving a critical

Answer 1

If your claim holds true (I haven't got the time to read up, and it would appear as though you have researched this before posting the question), I suggest

 sleep(0);

to explicitely yield in between critical sections.

while(true)
{
    critsect.enter();
    ... do calculations ...
    ... maybe call a blocking operation so we sleep ...
    critsect.leave();
    sleep(0);
}