// Some utilities.
void SharedHeap::print_size_transition(outputStream* out,
size_t bytes_before,
size_t bytes_after,
size_t capacity) {
out->print(" %d%s->%d%s(%d%s)",
byte_size_in_proper_unit(bytes_before),
proper_unit_for_byte_size(bytes_before),
byte_size_in_proper_unit(bytes_after),
proper_unit_for_byte_size(bytes_after),
byte_size_in_proper_unit(capacity),
proper_unit_for_byte_size(capacity));
}
bool VM_GC_Operation::doit_prologue() {
assert(Thread::current()->is_Java_thread(), "just checking");
assert(((_gc_cause != GCCause::_no_gc) &&
(_gc_cause != GCCause::_no_cause_specified)), "Illegal GCCause");
// To be able to handle a GC the VM initialization needs to be completed.
if (!is_init_completed()) {
vm_exit_during_initialization(
err_msg("GC triggered before VM initialization completed. Try increasing "
"NewSize, current value " UINTX_FORMAT "%s.",
byte_size_in_proper_unit(NewSize),
proper_unit_for_byte_size(NewSize)));
}
acquire_pending_list_lock();
// If the GC count has changed someone beat us to the collection
// Get the Heap_lock after the pending_list_lock.
Heap_lock->lock();
// Check invocations
if (skip_operation()) {
// skip collection
Heap_lock->unlock();
release_and_notify_pending_list_lock();
_prologue_succeeded = false;
} else {
_prologue_succeeded = true;
SharedHeap* sh = SharedHeap::heap();
if (sh != NULL) sh->_thread_holds_heap_lock_for_gc = true;
}
return _prologue_succeeded;
}
