> > I *sounds* like the problem you're trying to solve** is some thing like > > I want to efficiently read data from a serial line, returning > > whenever at least > > 250 bytes are available or when more then 0.1s has passed. > > If no data is received, it should still return after 0.1s. > > No, read() should not return 10 times per second when there is "no > data". It must depend on VMIN and VTIME. When 1 byte becomes > available, the 0.1 timer starts, and further bytes do not restart it. > A call to read() returns when VMIN is satisfied, or the timer expires > by reaching 0.1. Tthe timer must not be "interbyte," restarted by > further bytes. The worst case I described continually resets an > interbyte timer, pushing it into the future, until VMIN overcomes the > effect. That can take up to 20 seconds.
Are you saying OpenBSD does it wrong, or that all the operating systems do it wrong?
