diff -r 000000000000 -r f90c822e73f8 src/share/vm/runtime/osThread.hpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/runtime/osThread.hpp Wed Apr 27 01:25:04 2016 +0800 @@ -0,0 +1,166 @@ +/* + * Copyright (c) 1997, 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_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/top.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 { + friend class VMStructs; + 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 +#ifdef TARGET_OS_FAMILY_linux +# include "osThread_linux.hpp" +#endif +#ifdef TARGET_OS_FAMILY_solaris +# include "osThread_solaris.hpp" +#endif +#ifdef TARGET_OS_FAMILY_windows +# include "osThread_windows.hpp" +#endif +#ifdef TARGET_OS_FAMILY_aix +# include "osThread_aix.hpp" +#endif +#ifdef TARGET_OS_FAMILY_bsd +# include "osThread_bsd.hpp" +#endif + + 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