| /* |
| * Copyright (c) 1997, 2016, 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_OSTHREAD_HPP |
| #define SHARE_VM_RUNTIME_OSTHREAD_HPP |
| |
| #include "runtime/frame.hpp" |
| #include "runtime/handles.hpp" |
| #include "runtime/javaFrameAnchor.hpp" |
| #include "runtime/objectMonitor.hpp" |
| #include "utilities/macros.hpp" |
| |
| // The OSThread class holds OS-specific thread information. It is equivalent |
| // to the sys_thread_t structure of the classic JVM implementation. |
| |
| // The thread states represented by the ThreadState values are platform-specific |
| // and are likely to be only approximate, because most OSes don't give you access |
| // to precise thread state information. |
| |
| // Note: the ThreadState is legacy code and is not correctly implemented. |
| // Uses of ThreadState need to be replaced by the state in the JavaThread. |
| |
| enum ThreadState { |
| ALLOCATED, // Memory has been allocated but not initialized |
| INITIALIZED, // The thread has been initialized but yet started |
| RUNNABLE, // Has been started and is runnable, but not necessarily running |
| MONITOR_WAIT, // Waiting on a contended monitor lock |
| CONDVAR_WAIT, // Waiting on a condition variable |
| OBJECT_WAIT, // Waiting on an Object.wait() call |
| BREAKPOINTED, // Suspended at breakpoint |
| SLEEPING, // Thread.sleep() |
| ZOMBIE // All done, but not reclaimed yet |
| }; |
| |
| // I'd make OSThread a ValueObj embedded in Thread to avoid an indirection, but |
| // the assembler test in java.cpp expects that it can install the OSThread of |
| // the main thread into its own Thread at will. |
| |
| |
| class OSThread: public CHeapObj<mtThread> { |
| friend class VMStructs; |
| friend class JVMCIVMStructs; |
| private: |
| OSThreadStartFunc _start_proc; // Thread start routine |
| void* _start_parm; // Thread start routine parameter |
| volatile ThreadState _state; // Thread state *hint* |
| volatile jint _interrupted; // Thread.isInterrupted state |
| |
| // Note: _interrupted must be jint, so that Java intrinsics can access it. |
| // The value stored there must be either 0 or 1. It must be possible |
| // for Java to emulate Thread.currentThread().isInterrupted() by performing |
| // the double indirection Thread::current()->_osthread->_interrupted. |
| |
| // Methods |
| public: |
| void set_state(ThreadState state) { _state = state; } |
| ThreadState get_state() { return _state; } |
| |
| OSThread(OSThreadStartFunc start_proc, void* start_parm); |
| ~OSThread(); |
| |
| // Accessors |
| OSThreadStartFunc start_proc() const { return _start_proc; } |
| void set_start_proc(OSThreadStartFunc start_proc) { _start_proc = start_proc; } |
| void* start_parm() const { return _start_parm; } |
| void set_start_parm(void* start_parm) { _start_parm = start_parm; } |
| |
| volatile bool interrupted() const { return _interrupted != 0; } |
| void set_interrupted(bool z) { _interrupted = z ? 1 : 0; } |
| |
| // Printing |
| void print_on(outputStream* st) const; |
| void print() const { print_on(tty); } |
| |
| // For java intrinsics: |
| static ByteSize interrupted_offset() { return byte_offset_of(OSThread, _interrupted); } |
| |
| // Platform dependent stuff |
| #include OS_HEADER(osThread) |
| |
| public: |
| static ByteSize thread_id_offset() { return byte_offset_of(OSThread, _thread_id); } |
| static size_t thread_id_size() { return sizeof(thread_id_t); } |
| |
| thread_id_t thread_id() const { return _thread_id; } |
| |
| void set_thread_id(thread_id_t id) { _thread_id = id; } |
| |
| private: |
| // _thread_id is kernel thread id (similar to LWP id on Solaris). Each |
| // thread has a unique thread_id (BsdThreads or NPTL). It can be used |
| // to access /proc. |
| thread_id_t _thread_id; |
| }; |
| |
| |
| // Utility class for use with condition variables: |
| class OSThreadWaitState : public StackObj { |
| OSThread* _osthread; |
| ThreadState _old_state; |
| public: |
| OSThreadWaitState(OSThread* osthread, bool is_object_wait) { |
| _osthread = osthread; |
| _old_state = osthread->get_state(); |
| if (is_object_wait) { |
| osthread->set_state(OBJECT_WAIT); |
| } else { |
| osthread->set_state(CONDVAR_WAIT); |
| } |
| } |
| ~OSThreadWaitState() { |
| _osthread->set_state(_old_state); |
| } |
| }; |
| |
| |
| // Utility class for use with contended monitors: |
| class OSThreadContendState : public StackObj { |
| OSThread* _osthread; |
| ThreadState _old_state; |
| public: |
| OSThreadContendState(OSThread* osthread) { |
| _osthread = osthread; |
| _old_state = osthread->get_state(); |
| osthread->set_state(MONITOR_WAIT); |
| } |
| ~OSThreadContendState() { |
| _osthread->set_state(_old_state); |
| } |
| }; |
| |
| #endif // SHARE_VM_RUNTIME_OSTHREAD_HPP |