src/os/solaris/vm/os_solaris.cpp

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rev 6280 : [mq]: osx-clock

*** 1393,1405 **** // gethrtime can move backwards if read from one cpu and then a different cpu // getTimeNanos is guaranteed to not move backward on Solaris inline hrtime_t getTimeNanos() { if (VM_Version::supports_cx8()) { const hrtime_t now = gethrtime(); ! // Use atomic long load since 32-bit x86 uses 2 registers to keep long. ! const hrtime_t prev = Atomic::load((volatile jlong*)&max_hrtime); ! if (now <= prev) return prev; // same or retrograde time; const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, 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 "obs" is >= now then // we should return "obs". If the CAS failed and now > obs > prv then --- 1393,1410 ---- // gethrtime can move backwards if read from one cpu and then a different cpu // getTimeNanos is guaranteed to not move backward on Solaris inline hrtime_t getTimeNanos() { if (VM_Version::supports_cx8()) { const hrtime_t now = gethrtime(); ! if (AssumeMonotonicOSTimers) { ! return now; ! } ! ! const hrtime_t prev = max_hrtime; ! if (now <= prev) { ! return prev; // same or retrograde time; ! } const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, 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 "obs" is >= now then // we should return "obs". If the CAS failed and now > obs > prv then