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 /*

  * 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 OS_SOLARIS_VM_OSTHREAD_SOLARIS_HPP

 #define OS_SOLARIS_VM_OSTHREAD_SOLARIS_HPP

 // This is embedded via include into the class OSThread

  public:

   typedef thread_t thread_id_t;

  private:

   uint     _lwp_id;            // lwp ID, only used with bound threads

   int      _native_priority;   // Saved native priority when starting

                                // a bound thread

   sigset_t _caller_sigmask;    // Caller's signal mask

   bool     _vm_created_thread; // true if the VM created this thread,

                                // false if primary thread or attached thread

  public:

   uint     lwp_id() const          { return _lwp_id; }

   int      native_priority() const { return _native_priority; }

   // 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_lwp_id(uint id)           { _lwp_id = id; }

   void set_native_priority(int prio) { _native_priority = prio; }

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

  // 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 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();

 #endif // OS_SOLARIS_VM_OSTHREAD_SOLARIS_HPP