Mercurial > hg > graal-compiler
view src/share/vm/runtime/vmThread.hpp @ 20654:fa6adc194d48
8064667: Add -XX:+CheckEndorsedAndExtDirs flag to JDK 8
Reviewed-by: coleenp, ccheung
author | mchung |
---|---|
date | Wed, 19 Nov 2014 14:21:09 -0800 |
parents | 4af19b914f53 |
children | 4ca6dc0799b6 |
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/* * Copyright (c) 1998, 2012, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef SHARE_VM_RUNTIME_VMTHREAD_HPP #define SHARE_VM_RUNTIME_VMTHREAD_HPP #include "runtime/perfData.hpp" #include "runtime/thread.inline.hpp" #include "runtime/vm_operations.hpp" // // Prioritized queue of VM operations. // // Encapsulates both queue management and // and priority policy // class VMOperationQueue : public CHeapObj<mtInternal> { private: enum Priorities { SafepointPriority, // Highest priority (operation executed at a safepoint) MediumPriority, // Medium priority nof_priorities }; // We maintain a doubled linked list, with explicit count. int _queue_length[nof_priorities]; int _queue_counter; VM_Operation* _queue [nof_priorities]; // we also allow the vmThread to register the ops it has drained so we // can scan them from oops_do VM_Operation* _drain_list; // Double-linked non-empty list insert. void insert(VM_Operation* q,VM_Operation* n); void unlink(VM_Operation* q); // Basic queue manipulation bool queue_empty (int prio); void queue_add_front (int prio, VM_Operation *op); void queue_add_back (int prio, VM_Operation *op); VM_Operation* queue_remove_front(int prio); void queue_oops_do(int queue, OopClosure* f); void drain_list_oops_do(OopClosure* f); VM_Operation* queue_drain(int prio); // lock-free query: may return the wrong answer but must not break bool queue_peek(int prio) { return _queue_length[prio] > 0; } public: VMOperationQueue(); // Highlevel operations. Encapsulates policy bool add(VM_Operation *op); VM_Operation* remove_next(); // Returns next or null VM_Operation* remove_next_at_safepoint_priority() { return queue_remove_front(SafepointPriority); } VM_Operation* drain_at_safepoint_priority() { return queue_drain(SafepointPriority); } void set_drain_list(VM_Operation* list) { _drain_list = list; } bool peek_at_safepoint_priority() { return queue_peek(SafepointPriority); } // GC support void oops_do(OopClosure* f); void verify_queue(int prio) PRODUCT_RETURN; }; // // A single VMThread (the primordial thread) spawns all other threads // and is itself used by other threads to offload heavy vm operations // like scavenge, garbage_collect etc. // class VMThread: public NamedThread { private: static ThreadPriority _current_priority; static bool _should_terminate; static bool _terminated; static Monitor * _terminate_lock; static PerfCounter* _perf_accumulated_vm_operation_time; void evaluate_operation(VM_Operation* op); public: // Constructor VMThread(); // Tester bool is_VM_thread() const { return true; } bool is_GC_thread() const { return true; } // The ever running loop for the VMThread void loop(); // Called to stop the VM thread static void wait_for_vm_thread_exit(); static bool should_terminate() { return _should_terminate; } static bool is_terminated() { return _terminated == true; } // Execution of vm operation static void execute(VM_Operation* op); // Returns the current vm operation if any. static VM_Operation* vm_operation() { return _cur_vm_operation; } // Returns the single instance of VMThread. static VMThread* vm_thread() { return _vm_thread; } // GC support void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); // Debugging void print_on(outputStream* st) const; void print() const { print_on(tty); } void verify(); // Performance measurement static PerfCounter* perf_accumulated_vm_operation_time() { return _perf_accumulated_vm_operation_time; } // Entry for starting vm thread virtual void run(); // Creations/Destructions static void create(); static void destroy(); private: // VM_Operation support static VM_Operation* _cur_vm_operation; // Current VM operation static VMOperationQueue* _vm_queue; // Queue (w/ policy) of VM operations // Pointer to single-instance of VM thread static VMThread* _vm_thread; }; #endif // SHARE_VM_RUNTIME_VMTHREAD_HPP