Thu, 25 Sep 2008 12:50:51 -0700
6744783: HotSpot segfaults if given -XX options with an empty string argument
Reviewed-by: kamg, kvn
Contributed-by: volker.simonis@gmail.com
duke@435 | 1 | /* |
duke@435 | 2 | * Copyright 1997-2005 Sun Microsystems, Inc. All Rights Reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@435 | 21 | * have any questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
duke@435 | 25 | // The OSThread class holds OS-specific thread information. It is equivalent |
duke@435 | 26 | // to the sys_thread_t structure of the classic JVM implementation. |
duke@435 | 27 | |
duke@435 | 28 | // The thread states represented by the ThreadState values are platform-specific |
duke@435 | 29 | // and are likely to be only approximate, because most OSes don't give you access |
duke@435 | 30 | // to precise thread state information. |
duke@435 | 31 | |
duke@435 | 32 | // Note: the ThreadState is legacy code and is not correctly implemented. |
duke@435 | 33 | // Uses of ThreadState need to be replaced by the state in the JavaThread. |
duke@435 | 34 | |
duke@435 | 35 | enum ThreadState { |
duke@435 | 36 | ALLOCATED, // Memory has been allocated but not initialized |
duke@435 | 37 | INITIALIZED, // The thread has been initialized but yet started |
duke@435 | 38 | RUNNABLE, // Has been started and is runnable, but not necessarily running |
duke@435 | 39 | MONITOR_WAIT, // Waiting on a contended monitor lock |
duke@435 | 40 | CONDVAR_WAIT, // Waiting on a condition variable |
duke@435 | 41 | OBJECT_WAIT, // Waiting on an Object.wait() call |
duke@435 | 42 | BREAKPOINTED, // Suspended at breakpoint |
duke@435 | 43 | SLEEPING, // Thread.sleep() |
duke@435 | 44 | ZOMBIE // All done, but not reclaimed yet |
duke@435 | 45 | }; |
duke@435 | 46 | |
duke@435 | 47 | // I'd make OSThread a ValueObj embedded in Thread to avoid an indirection, but |
duke@435 | 48 | // the assembler test in java.cpp expects that it can install the OSThread of |
duke@435 | 49 | // the main thread into its own Thread at will. |
duke@435 | 50 | |
duke@435 | 51 | |
duke@435 | 52 | class OSThread: public CHeapObj { |
duke@435 | 53 | friend class VMStructs; |
duke@435 | 54 | private: |
duke@435 | 55 | //void* _start_proc; // Thread start routine |
duke@435 | 56 | OSThreadStartFunc _start_proc; // Thread start routine |
duke@435 | 57 | void* _start_parm; // Thread start routine parameter |
duke@435 | 58 | volatile ThreadState _state; // Thread state *hint* |
duke@435 | 59 | jint _interrupted; // Thread.isInterrupted state |
duke@435 | 60 | |
duke@435 | 61 | // Note: _interrupted must be jint, so that Java intrinsics can access it. |
duke@435 | 62 | // The value stored there must be either 0 or 1. It must be possible |
duke@435 | 63 | // for Java to emulate Thread.currentThread().isInterrupted() by performing |
duke@435 | 64 | // the double indirection Thread::current()->_osthread->_interrupted. |
duke@435 | 65 | |
duke@435 | 66 | // Methods |
duke@435 | 67 | public: |
duke@435 | 68 | void set_state(ThreadState state) { _state = state; } |
duke@435 | 69 | ThreadState get_state() { return _state; } |
duke@435 | 70 | |
duke@435 | 71 | // Constructor |
duke@435 | 72 | OSThread(OSThreadStartFunc start_proc, void* start_parm); |
duke@435 | 73 | |
duke@435 | 74 | // Destructor |
duke@435 | 75 | ~OSThread(); |
duke@435 | 76 | |
duke@435 | 77 | // Accessors |
duke@435 | 78 | OSThreadStartFunc start_proc() const { return _start_proc; } |
duke@435 | 79 | void set_start_proc(OSThreadStartFunc start_proc) { _start_proc = start_proc; } |
duke@435 | 80 | void* start_parm() const { return _start_parm; } |
duke@435 | 81 | void set_start_parm(void* start_parm) { _start_parm = start_parm; } |
duke@435 | 82 | |
duke@435 | 83 | bool interrupted() const { return _interrupted != 0; } |
duke@435 | 84 | void set_interrupted(bool z) { _interrupted = z ? 1 : 0; } |
duke@435 | 85 | |
duke@435 | 86 | // Printing |
duke@435 | 87 | void print_on(outputStream* st) const; |
duke@435 | 88 | void print() const { print_on(tty); } |
duke@435 | 89 | |
duke@435 | 90 | // For java intrinsics: |
duke@435 | 91 | static ByteSize interrupted_offset() { return byte_offset_of(OSThread, _interrupted); } |
duke@435 | 92 | |
duke@435 | 93 | // Platform dependent stuff |
duke@435 | 94 | #include "incls/_osThread_pd.hpp.incl" |
duke@435 | 95 | }; |
duke@435 | 96 | |
duke@435 | 97 | |
duke@435 | 98 | // Utility class for use with condition variables: |
duke@435 | 99 | class OSThreadWaitState : public StackObj { |
duke@435 | 100 | OSThread* _osthread; |
duke@435 | 101 | ThreadState _old_state; |
duke@435 | 102 | public: |
duke@435 | 103 | OSThreadWaitState(OSThread* osthread, bool is_object_wait) { |
duke@435 | 104 | _osthread = osthread; |
duke@435 | 105 | _old_state = osthread->get_state(); |
duke@435 | 106 | if (is_object_wait) { |
duke@435 | 107 | osthread->set_state(OBJECT_WAIT); |
duke@435 | 108 | } else { |
duke@435 | 109 | osthread->set_state(CONDVAR_WAIT); |
duke@435 | 110 | } |
duke@435 | 111 | } |
duke@435 | 112 | ~OSThreadWaitState() { |
duke@435 | 113 | _osthread->set_state(_old_state); |
duke@435 | 114 | } |
duke@435 | 115 | }; |
duke@435 | 116 | |
duke@435 | 117 | |
duke@435 | 118 | // Utility class for use with contended monitors: |
duke@435 | 119 | class OSThreadContendState : public StackObj { |
duke@435 | 120 | OSThread* _osthread; |
duke@435 | 121 | ThreadState _old_state; |
duke@435 | 122 | public: |
duke@435 | 123 | OSThreadContendState(OSThread* osthread) { |
duke@435 | 124 | _osthread = osthread; |
duke@435 | 125 | _old_state = osthread->get_state(); |
duke@435 | 126 | osthread->set_state(MONITOR_WAIT); |
duke@435 | 127 | } |
duke@435 | 128 | ~OSThreadContendState() { |
duke@435 | 129 | _osthread->set_state(_old_state); |
duke@435 | 130 | } |
duke@435 | 131 | }; |