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hotspot/src/share/vm/runtime/osThread.hpp

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+/*
+ * Copyright 1997-2005 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+// 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:
+  //void* _start_proc;            // Thread start routine
+  OSThreadStartFunc _start_proc;  // Thread start routine
+  void* _start_parm;              // Thread start routine parameter
+  volatile ThreadState _state;    // Thread state *hint*
+  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; }
+
+  // Constructor
+  OSThread(OSThreadStartFunc start_proc, void* start_parm);
+
+  // Destructor
+  ~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; }
+
+  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 "incls/_osThread_pd.hpp.incl"
+};
+
+
+// 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);
+  }
+};