Mercurial > hg > graal-jvmci-8
diff src/share/vm/memory/gcLocker.hpp @ 806:821269eca479
6820167: GCALotAtAllSafepoints + FullGCALot(ScavengeALot) options crash JVM
Summary: Short-circuit gc-a-lot attempts by non-JavaThreads; SkipGCALot c'tor to elide re-entrant gc-a-lot attempts.
Reviewed-by: apetrusenko, jcoomes, jmasa, kamg
author | ysr |
---|---|
date | Thu, 11 Jun 2009 12:40:00 -0700 |
parents | d1605aabd0a1 |
children | bd02caa94611 |
line wrap: on
line diff
--- a/src/share/vm/memory/gcLocker.hpp Wed Jun 10 14:57:21 2009 -0700 +++ b/src/share/vm/memory/gcLocker.hpp Thu Jun 11 12:40:00 2009 -0700 @@ -242,6 +242,31 @@ #endif }; +// A SkipGCALot object is used to elide the usual effect of gc-a-lot +// over a section of execution by a thread. Currently, it's used only to +// prevent re-entrant calls to GC. +class SkipGCALot : public StackObj { + private: + bool _saved; + Thread* _t; + + public: +#ifdef ASSERT + SkipGCALot(Thread* t) : _t(t) { + _saved = _t->skip_gcalot(); + _t->set_skip_gcalot(true); + } + + ~SkipGCALot() { + assert(_t->skip_gcalot(), "Save-restore protocol invariant"); + _t->set_skip_gcalot(_saved); + } +#else + SkipGCALot(Thread* t) { } + ~SkipGCALot() { } +#endif +}; + // JRT_LEAF currently can be called from either _thread_in_Java or // _thread_in_native mode. In _thread_in_native, it is ok // for another thread to trigger GC. The rest of the JRT_LEAF