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src/hotspot/share/utilities/waitBarrier_generic.cpp

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  65   SpinYield sp;
  66   do {
  67     left = GenericWaitBarrier::wake_if_needed();
  68     if (left == 0 && _barrier_threads > 0) {
  69       // There is no thread to wake but we still have barrier threads.
  70       sp.wait();
  71     }
  72     // We must loop here until there are no waiters or potential waiters.
  73   } while (left > 0 || _barrier_threads > 0);
  74   // API specifies disarm() must provide a trailing fence.
  75   OrderAccess::fence();
  76 }
  77 
  78 void GenericWaitBarrier::wait(int barrier_tag) {
  79   assert(barrier_tag != 0, "Trying to wait on disarmed value");
  80   if (barrier_tag != _barrier_tag) {
  81     // API specifies wait() must provide a trailing fence.
  82     OrderAccess::fence();
  83     return;
  84   }
  85   Atomic::add(1, &_barrier_threads);
  86   if (barrier_tag != 0 && barrier_tag == _barrier_tag) {
  87     Atomic::add(1, &_waiters);
  88     _sem_barrier.wait();
  89     // We help out with posting, but we need to do so before we decrement the
  90     // _barrier_threads otherwise we might wake threads up in next wait.
  91     GenericWaitBarrier::wake_if_needed();
  92   }
  93   Atomic::add(-1, &_barrier_threads);
  94 }


  65   SpinYield sp;
  66   do {
  67     left = GenericWaitBarrier::wake_if_needed();
  68     if (left == 0 && _barrier_threads > 0) {
  69       // There is no thread to wake but we still have barrier threads.
  70       sp.wait();
  71     }
  72     // We must loop here until there are no waiters or potential waiters.
  73   } while (left > 0 || _barrier_threads > 0);
  74   // API specifies disarm() must provide a trailing fence.
  75   OrderAccess::fence();
  76 }
  77 
  78 void GenericWaitBarrier::wait(int barrier_tag) {
  79   assert(barrier_tag != 0, "Trying to wait on disarmed value");
  80   if (barrier_tag != _barrier_tag) {
  81     // API specifies wait() must provide a trailing fence.
  82     OrderAccess::fence();
  83     return;
  84   }
  85   Atomic::add(&_barrier_threads, 1);
  86   if (barrier_tag != 0 && barrier_tag == _barrier_tag) {
  87     Atomic::add(&_waiters, 1);
  88     _sem_barrier.wait();
  89     // We help out with posting, but we need to do so before we decrement the
  90     // _barrier_threads otherwise we might wake threads up in next wait.
  91     GenericWaitBarrier::wake_if_needed();
  92   }
  93   Atomic::add(&_barrier_threads, -1);
  94 }
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