src/os/bsd/vm/os_bsd.cpp

rev 13441 : imported patch bsd_x86

*** 950,960 ****
    const uint64_t now = (tm * Bsd::_timebase_info.numer) / Bsd::_timebase_info.denom;
    const uint64_t prev = Bsd::_max_abstime;
    if (now <= prev) {
      return prev;   // same or retrograde time;
    }
!   const uint64_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&Bsd::_max_abstime, prev);
    assert(obsv >= prev, "invariant");   // Monotonicity
    // If the CAS succeeded then we're done and return "now".
    // If the CAS failed and the observed value "obsv" is >= now then
    // we should return "obsv".  If the CAS failed and now > obsv > prv then
    // some other thread raced this thread and installed a new value, in which case
--- 950,960 ----
    const uint64_t now = (tm * Bsd::_timebase_info.numer) / Bsd::_timebase_info.denom;
    const uint64_t prev = Bsd::_max_abstime;
    if (now <= prev) {
      return prev;   // same or retrograde time;
    }
!   const uint64_t obsv = Atomic::cmpxchg(now, &Bsd::_max_abstime, prev);
    assert(obsv >= prev, "invariant");   // Monotonicity
    // If the CAS succeeded then we're done and return "now".
    // If the CAS failed and the observed value "obsv" is >= now then
    // we should return "obsv".  If the CAS failed and now > obsv > prv then
    // some other thread raced this thread and installed a new value, in which case