613 if (!concurrent) {
614 // Wait for completion of request (non-concurrent)
615 // Note: only a JavaThread triggers the safepoint check when locking
616 MutexLocker mu(VMOperationRequest_lock);
617 while(t->vm_operation_completed_count() < ticket) {
618 VMOperationRequest_lock->wait(!t->is_Java_thread());
619 }
620 }
621
622 if (execute_epilog) {
623 op->doit_epilogue();
624 }
625 } else {
626 // invoked by VM thread; usually nested VM operation
627 assert(t->is_VM_thread(), "must be a VM thread");
628 VM_Operation* prev_vm_operation = vm_operation();
629 if (prev_vm_operation != NULL) {
630 // Check the VM operation allows nested VM operation. This normally not the case, e.g., the compiler
631 // does not allow nested scavenges or compiles.
632 if (!prev_vm_operation->allow_nested_vm_operations()) {
633 fatal(err_msg("Nested VM operation %s requested by operation %s",
634 op->name(), vm_operation()->name()));
635 }
636 op->set_calling_thread(prev_vm_operation->calling_thread(), prev_vm_operation->priority());
637 }
638
639 EventMark em("Executing %s VM operation: %s", prev_vm_operation ? "nested" : "", op->name());
640
641 // Release all internal handles after operation is evaluated
642 HandleMark hm(t);
643 _cur_vm_operation = op;
644
645 if (op->evaluate_at_safepoint() && !SafepointSynchronize::is_at_safepoint()) {
646 SafepointSynchronize::begin();
647 op->evaluate();
648 SafepointSynchronize::end();
649 } else {
650 op->evaluate();
651 }
652
653 // Free memory if needed
654 if (op->is_cheap_allocated()) delete op;
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613 if (!concurrent) {
614 // Wait for completion of request (non-concurrent)
615 // Note: only a JavaThread triggers the safepoint check when locking
616 MutexLocker mu(VMOperationRequest_lock);
617 while(t->vm_operation_completed_count() < ticket) {
618 VMOperationRequest_lock->wait(!t->is_Java_thread());
619 }
620 }
621
622 if (execute_epilog) {
623 op->doit_epilogue();
624 }
625 } else {
626 // invoked by VM thread; usually nested VM operation
627 assert(t->is_VM_thread(), "must be a VM thread");
628 VM_Operation* prev_vm_operation = vm_operation();
629 if (prev_vm_operation != NULL) {
630 // Check the VM operation allows nested VM operation. This normally not the case, e.g., the compiler
631 // does not allow nested scavenges or compiles.
632 if (!prev_vm_operation->allow_nested_vm_operations()) {
633 fatal("Nested VM operation %s requested by operation %s",
634 op->name(), vm_operation()->name());
635 }
636 op->set_calling_thread(prev_vm_operation->calling_thread(), prev_vm_operation->priority());
637 }
638
639 EventMark em("Executing %s VM operation: %s", prev_vm_operation ? "nested" : "", op->name());
640
641 // Release all internal handles after operation is evaluated
642 HandleMark hm(t);
643 _cur_vm_operation = op;
644
645 if (op->evaluate_at_safepoint() && !SafepointSynchronize::is_at_safepoint()) {
646 SafepointSynchronize::begin();
647 op->evaluate();
648 SafepointSynchronize::end();
649 } else {
650 op->evaluate();
651 }
652
653 // Free memory if needed
654 if (op->is_cheap_allocated()) delete op;
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