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6820167: GCALotAtAllSafepoints + FullGCALot(ScavengeALot) options crash JVM

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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
This commit is contained in:
Y. Srinivas Ramakrishna 2009-06-11 12:40:00 -07:00
parent 46dcdf10e6
commit 9d9317de4c
5 changed files with 39 additions and 2 deletions
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8
hotspot/src/share/vm/runtime/thread.hpp
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@ -191,6 +191,9 @@ class Thread: public ThreadShadow {
NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
// Used by SkipGCALot class.
NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
// Record when GC is locked out via the GC_locker mechanism
CHECK_UNHANDLED_OOPS_ONLY(int _gc_locked_out_count;)
@ -308,6 +311,11 @@ class Thread: public ThreadShadow {
bool is_gc_locked_out() { return _gc_locked_out_count > 0; }
#endif // CHECK_UNHANDLED_OOPS
#ifndef PRODUCT
bool skip_gcalot() { return _skip_gcalot; }
void set_skip_gcalot(bool v) { _skip_gcalot = v; }
#endif
public:
// Installs a pending exception to be inserted later
static void send_async_exception(oop thread_oop, oop java_throwable);