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 /*

  * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.

  * Copyright 2012, 2013 SAP AG. 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_AIX_VM_OSTHREAD_AIX_HPP

 #define OS_AIX_VM_OSTHREAD_AIX_HPP

  public:

   typedef pid_t thread_id_t;

  private:

   int _thread_type;

  public:

   int thread_type() const {

     return _thread_type;

   }

   void set_thread_type(int type) {

     _thread_type = type;

   }

  private:

   // _pthread_id is the pthread id, which is used by library calls

   // (e.g. pthread_kill).

   pthread_t _pthread_id;

   sigset_t _caller_sigmask; // Caller's signal mask

  public:

   // 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

   // We expect no reposition failures so kill vm if we get one.

   //

   bool valid_reposition_failure() {

     return false;

   }

 #endif // ASSERT

   pthread_t pthread_id() const {

     return _pthread_id;

   }

   void set_pthread_id(pthread_t tid) {

     _pthread_id = tid;

   }

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

   // suspension support.

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

  public:

   // flags that support signal based suspend/resume on Linux are in a

   // separate class to avoid confusion with many flags in OSThread that

   // are used by VM level suspend/resume.

   os::SuspendResume sr;

   // _ucontext and _siginfo are used by SR_handler() to save thread context,

   // and they will later be used to walk the stack or reposition thread PC.

   // If the thread is not suspended in SR_handler() (e.g. self suspend),

   // the value in _ucontext is meaningless, so we must use the last Java

   // frame information as the frame. This will mean that for threads

   // that are parked on a mutex the profiler (and safepoint mechanism)

   // will see the thread as if it were still in the Java frame. This

   // not a problem for the profiler since the Java frame is a close

   // enough result. For the safepoint mechanism when the give it the

   // Java frame we are not at a point where the safepoint needs the

   // frame to that accurate (like for a compiled safepoint) since we

   // should be in a place where we are native and will block ourselves

   // if we transition.

  private:

   void* _siginfo;

   ucontext_t* _ucontext;

   int _expanding_stack;                 // non zero if manually expanding stack

   address _alt_sig_stack;               // address of base of alternate signal stack

  public:

   void* siginfo() const                   { return _siginfo;  }

   void set_siginfo(void* ptr)             { _siginfo = ptr;   }

   ucontext_t* ucontext() const            { return _ucontext; }

   void set_ucontext(ucontext_t* ptr)      { _ucontext = ptr;  }

   void set_expanding_stack(void)          { _expanding_stack = 1;  }

   void clear_expanding_stack(void)        { _expanding_stack = 0;  }

   int  expanding_stack(void)              { return _expanding_stack;  }

   void set_alt_sig_stack(address val)     { _alt_sig_stack = val; }

   address alt_sig_stack(void)             { return _alt_sig_stack; }

  private:

   Monitor* _startThread_lock;     // sync parent and child in thread creation

  public:

   Monitor* startThread_lock() const {

     return _startThread_lock;

   }

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

   // Platform dependent initialization and cleanup

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

  private:

   void pd_initialize();

   void pd_destroy();

  public:

   // The last measured values of cpu timing to prevent the "stale

   // value return" bug in thread_cpu_time.

   volatile struct {

     jlong sys;

     jlong user;

   } _last_cpu_times;

 #endif // OS_AIX_VM_OSTHREAD_AIX_HPP