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8210155: Lock ClassLoaderDataGraph

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In preparation for concurrent class unloading.

Reviewed-by: hseigel, eosterlund
This commit is contained in:
Coleen Phillimore 2018-08-31 07:03:46 -04:00
parent 71479d029a
commit eb9259138f
19 changed files with 199 additions and 82 deletions
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17
src/hotspot/share/classfile/classLoaderData.hpp
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@ -70,6 +70,7 @@ class ClassLoaderDataGraph : public AllStatic {
friend class ClassLoaderDataGraphMetaspaceIterator;
friend class ClassLoaderDataGraphKlassIteratorAtomic;
friend class ClassLoaderDataGraphKlassIteratorStatic;
friend class ClassLoaderDataGraphIterator;
friend class VMStructs;
private:
// All CLDs (except the null CLD) can be reached by walking _head->_next->...
@ -118,6 +119,7 @@ class ClassLoaderDataGraph : public AllStatic {
static void packages_do(void f(PackageEntry*));
static void packages_unloading_do(void f(PackageEntry*));
static void loaded_classes_do(KlassClosure* klass_closure);
static void unlocked_loaded_classes_do(KlassClosure* klass_closure);
static void classes_unloading_do(void f(Klass* const));
static bool do_unloading(bool do_cleaning);
@ -177,6 +179,20 @@ class ClassLoaderDataGraph : public AllStatic {
#endif
};
class LockedClassesDo : public KlassClosure {
typedef void (*classes_do_func_t)(Klass*);
classes_do_func_t _function;
public:
LockedClassesDo(); // For callers who provide their own do_klass
LockedClassesDo(classes_do_func_t function);
~LockedClassesDo();
void do_klass(Klass* k) {
(*_function)(k);
}
};
// ClassLoaderData class
class ClassLoaderData : public CHeapObj<mtClass> {
@ -213,6 +229,7 @@ class ClassLoaderData : public CHeapObj<mtClass> {
};
friend class ClassLoaderDataGraph;
friend class ClassLoaderDataGraphIterator;
friend class ClassLoaderDataGraphKlassIteratorAtomic;
friend class ClassLoaderDataGraphKlassIteratorStatic;
friend class ClassLoaderDataGraphMetaspaceIterator;