Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: src/os/solaris/vm/os_solaris.cpp
src/os/solaris/vm/os_solaris.cpp
- changeset 1329
- 665be97e8704
- parent 1126
- 956304450e80
- child 1552
- 95e9083cf4a7
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| 1328:dd0a4e1e219b | 1329:665be97e8704 |
|---|---|
| 1641 // gethrtime can move backwards if read from one cpu and then a different cpu | 1641 // gethrtime can move backwards if read from one cpu and then a different cpu |
| 1642 // getTimeNanos is guaranteed to not move backward on Solaris | 1642 // getTimeNanos is guaranteed to not move backward on Solaris |
| 1643 inline hrtime_t getTimeNanos() { | 1643 inline hrtime_t getTimeNanos() { |
| 1644 if (VM_Version::supports_cx8()) { | 1644 if (VM_Version::supports_cx8()) { |
| 1645 const hrtime_t now = gethrtime(); | 1645 const hrtime_t now = gethrtime(); |
| 1646 const hrtime_t prev = max_hrtime; | 1646 // Use atomic long load since 32-bit x86 uses 2 registers to keep long. |
| 1647 const hrtime_t prev = Atomic::load((volatile jlong*)&max_hrtime); | |
| 1647 if (now <= prev) return prev; // same or retrograde time; | 1648 if (now <= prev) return prev; // same or retrograde time; |
| 1648 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev); | 1649 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev); |
| 1649 assert(obsv >= prev, "invariant"); // Monotonicity | 1650 assert(obsv >= prev, "invariant"); // Monotonicity |
| 1650 // If the CAS succeeded then we're done and return "now". | 1651 // If the CAS succeeded then we're done and return "now". |
| 1651 // If the CAS failed and the observed value "obs" is >= now then | 1652 // If the CAS failed and the observed value "obs" is >= now then |
