src/hotspot/os/linux/waitBarrier_linux.cpp

rev 53078 : 8214271: Fast primitive to wake many threads
Reviewed-by:
rev 53079 : [mq]: fix-sema

*** 47,64 ****
    assert(_futex_barrier == 0, "Already armed");
    _futex_barrier = barrier_tag;
    OrderAccess::fence();
  }
  
! void LinuxWaitBarrier::disarm() {
    assert(_futex_barrier != 0, "Not armed");
    _futex_barrier = 0;
-   OrderAccess::fence();
- }
- 
- void LinuxWaitBarrier::wake() {
-   assert(_futex_barrier == 0, "Not disarmed");
    int s = futex(&_futex_barrier,
                  FUTEX_WAKE_PRIVATE,
                  INT_MAX /* wake a max of this many threads */);
    guarantee_with_errno(s > -1, "futex FUTEX_WAKE");
  }
--- 47,59 ----
    assert(_futex_barrier == 0, "Already armed");
    _futex_barrier = barrier_tag;
    OrderAccess::fence();
  }
  
! void LinuxWaitBarrier::wake() {
    assert(_futex_barrier != 0, "Not armed");
    _futex_barrier = 0;
    int s = futex(&_futex_barrier,
                  FUTEX_WAKE_PRIVATE,
                  INT_MAX /* wake a max of this many threads */);
    guarantee_with_errno(s > -1, "futex FUTEX_WAKE");
  }