/*

 * Copyright 1997-2006 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.

 *

 */

// This is embedded via include into the class OSThread

 private:

  thread_t _thread_id;      // Solaris thread id

  unsigned int  _lwp_id;    // lwp ID, only used with bound threads

  sigset_t _caller_sigmask; // Caller's signal mask

  bool _vm_created_thread;  // true if the VM create this thread

                            // false if primary thread or attached thread

 public:

  thread_t thread_id() const      { return _thread_id; }

  unsigned int lwp_id() const     { return _lwp_id; }

  // Set and get state of _vm_created_thread flag

  void set_vm_created()           { _vm_created_thread = true; }

  bool is_vm_created()            { return _vm_created_thread; }

  // Methods to save/restore caller's signal mask

  sigset_t  caller_sigmask() const       { return _caller_sigmask; }

  void    set_caller_sigmask(sigset_t sigmask)  { _caller_sigmask = sigmask; }

#ifndef PRODUCT

  // Used for debugging, return a unique integer for each thread.

  int thread_identifier() const   { return _thread_id; }

#endif

#ifdef ASSERT

  // On solaris reposition can fail in two ways:

  // 1: a mismatched pc, because signal is delivered too late, target thread

  //    is resumed.

  // 2: on a timeout where signal is lost, target thread is resumed.

  bool valid_reposition_failure() {

    // only 1 and 2 can happen and we can handle both of them

    return true;

  }

#endif

  void set_thread_id(thread_t id) { _thread_id = id;   }

  void set_lwp_id(unsigned int id){ _lwp_id = id;   }

 // ***************************************************************

 // interrupt support.  interrupts (using signals) are used to get

 // the thread context (get_thread_pc), to set the thread context

 // (set_thread_pc), and to implement java.lang.Thread.interrupt.

 // ***************************************************************

 public:

  class InterruptArguments : StackObj {

   private:

    Thread*     _thread;   // the thread to signal was dispatched to

    ucontext_t* _ucontext; // the machine context at the time of the signal

   public:

    InterruptArguments(Thread* thread, ucontext_t* ucontext) {

      _thread   = thread;

      _ucontext = ucontext;

    }

    Thread*     thread()   const { return _thread;   }

    ucontext_t* ucontext() const { return _ucontext; }

  };

  // There are currently no asynchronous callbacks - and we'd better not

  // support them in the future either, as they need to be deallocated from

  // the interrupt handler, which is not safe; they also require locks to

  // protect the callback queue.

  class Sync_Interrupt_Callback : private StackObj {

   protected:

    volatile bool _is_done;

    Monitor*      _sync;

    Thread*       _target;

   public:

    Sync_Interrupt_Callback(Monitor * sync) {

      _is_done = false;  _target = NULL;  _sync = sync;

    }

    bool is_done() const               { return _is_done; }

    Thread* target() const             { return _target;  }

    int interrupt(Thread * target, int timeout);

    // override to implement the callback.

    virtual void execute(InterruptArguments *args) = 0;

    void leave_callback();

  };

 private:

  Sync_Interrupt_Callback * volatile _current_callback;

  enum {

    callback_in_progress = 1

  };

  Mutex * _current_callback_lock;       // only used on v8

 public:

  int set_interrupt_callback    (Sync_Interrupt_Callback * cb);

  void remove_interrupt_callback(Sync_Interrupt_Callback * cb);

  void OSThread::do_interrupt_callbacks_at_interrupt(InterruptArguments *args);

 // ***************************************************************

 // java.lang.Thread.interrupt state.

 // ***************************************************************

 private:

  JavaThreadState      _saved_interrupt_thread_state;       // the thread state before a system call -- restored afterward

 public:

  JavaThreadState   saved_interrupt_thread_state()                              { return _saved_interrupt_thread_state; }

  void              set_saved_interrupt_thread_state(JavaThreadState state)     { _saved_interrupt_thread_state = state; }

  static void       handle_spinlock_contention(int tries);                      // Used for thread local eden locking

  // ***************************************************************

  // Platform dependent initialization and cleanup

  // ***************************************************************

private:

  void pd_initialize();

  void pd_destroy();