1 /*
   2  * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 #ifndef SHARE_GC_Z_ZTHREAD_HPP
  25 #define SHARE_GC_Z_ZTHREAD_HPP
  26 
  27 #include "memory/allocation.hpp"
  28 #include "utilities/debug.hpp"
  29 
  30 class ZThread : public AllStatic {
  31   friend class ZTask;
  32 
  33 private:
  34   static __thread bool      _initialized;
  35   static __thread uintptr_t _id;
  36   static __thread bool      _is_vm;
  37   static __thread bool      _is_java;
  38   static __thread bool      _is_worker;
  39   static __thread uint      _worker_id;
  40 
  41   static void initialize();
  42 
  43   static void ensure_initialized() {
  44     if (!_initialized) {
  45       initialize();
  46     }
  47   }
  48 
  49   static bool has_worker_id();
  50   static void set_worker_id(uint worker_id);
  51   static void clear_worker_id();
  52 
  53 public:
  54   static const char* name();
  55 
  56   static uintptr_t id() {
  57     ensure_initialized();
  58     return _id;
  59   }
  60 
  61   static bool is_vm() {
  62     ensure_initialized();
  63     return _is_vm;
  64   }
  65 
  66   static bool is_java() {
  67     ensure_initialized();
  68     return _is_java;
  69   }
  70 
  71   static bool is_worker() {
  72     ensure_initialized();
  73     return _is_worker;
  74   }
  75 
  76   static uint worker_id() {
  77     assert(has_worker_id(), "Worker id not initialized");
  78     return _worker_id;
  79   }
  80 };
  81 
  82 #endif // SHARE_GC_Z_ZTHREAD_HPP