jdk8-mips64-public/hotspot: changeset 5483:cd25d3be91c5

8012144: multiple SIGSEGVs fails on staxf
Summary: Forward port of 7u change to add additional fence() on RMO platforms, with a load_acquire on all platforms
Reviewed-by: dholmes, kvn

     1.1 --- a/src/share/vm/utilities/taskqueue.hpp	Fri Aug 02 03:06:19 2013 -0700
     1.2 +++ b/src/share/vm/utilities/taskqueue.hpp	Tue Aug 06 20:01:40 2013 -0400
     1.3 @@ -395,7 +395,13 @@
     1.4  template<class E, MEMFLAGS F, unsigned int N>
     1.5  bool GenericTaskQueue<E, F, N>::pop_global(E& t) {
     1.6    Age oldAge = _age.get();
     1.7 -  uint localBot = _bottom;
     1.8 +  // Architectures with weak memory model require a barrier here
     1.9 +  // to guarantee that bottom is not older than age,
    1.10 +  // which is crucial for the correctness of the algorithm.
    1.11 +#if !(defined SPARC || defined IA32 || defined AMD64)
    1.12 +  OrderAccess::fence();
    1.13 +#endif
    1.14 +  uint localBot = OrderAccess::load_acquire((volatile juint*)&_bottom);
    1.15    uint n_elems = size(localBot, oldAge.top());
    1.16    if (n_elems == 0) {
    1.17      return false;
    1.18 @@ -644,7 +650,7 @@
    1.19  template<class E, MEMFLAGS F, unsigned int N> inline bool
    1.20  GenericTaskQueue<E, F, N>::push(E t) {
    1.21    uint localBot = _bottom;
    1.22 -  assert((localBot >= 0) && (localBot < N), "_bottom out of range.");
    1.23 +  assert(localBot < N, "_bottom out of range.");
    1.24    idx_t top = _age.top();
    1.25    uint dirty_n_elems = dirty_size(localBot, top);
    1.26    assert(dirty_n_elems < N, "n_elems out of range.");

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changeset

8012144: multiple SIGSEGVs fails on staxf