Asynchronous Communications Using select and poll

By Sean Eric Fagan

Dr. Dobb's Journal September 1998

if (p->p_wchan == (caddr_t)&selwait) {
  if (p->p_stat == SSLEEP)
    setrunnable(p);
  else
    unsleep(p);
} else if (p->p_flag & P_SELECT)
  p->p_flag &= ~P_SELECT;

Example 1: Waking up just one process.

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