src/threads/threadlist.hpp

   1 /* src/threads/threadlist.hpp - different thread-lists
   2
   3    Copyright (C) 1996-2011
   4    CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO
   5
   6    This file is part of CACAO.
   7
   8    This program is free software; you can redistribute it and/or
   9    modify it under the terms of the GNU General Public License as
  10    published by the Free Software Foundation; either version 2, or (at
  11    your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful, but
  14    WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16    General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  21    02110-1301, USA.
  22
  23 */
  24
  25
  26 #ifndef _THREADLIST_HPP
  27 #define _THREADLIST_HPP
  28
  29 #include "config.h"
  30
  31 #include <stdint.h>
  32
  33 #include "threads/thread.hpp"
  34
  35 #include "toolbox/list.hpp"
  36
  37 #include "vm/global.h"
  38
  39
  40 /* ThreadList *****************************************************************/
  41
  42 #ifdef __cplusplus
  43
  44 class ThreadList {
  45 private:
  46         static Mutex               _mutex;              // a mutex for all thread lists
  47
  48         static List<threadobject*> _active_thread_list; // list of active threads
  49         static List<threadobject*> _free_thread_list;   // list of free threads
  50         static List<int32_t>       _free_index_list;    // list of free thread indexes
  51
  52         // Thread counters visible to Java.
  53         static int32_t             _number_of_started_java_threads;
  54         static int32_t             _number_of_active_java_threads;
  55         static int32_t             _peak_of_active_java_threads;
  56
  57         // Thread counters for internal usage.
  58         static int32_t             _number_of_non_daemon_threads;
  59
  60         static void                 remove_from_active_thread_list(threadobject* t);
  61         static void                 add_to_free_thread_list(threadobject* t);
  62         static void                 add_to_free_index_list(int32_t index);
  63
  64 private:
  65         // Comparator class.
  66         class comparator : public std::binary_function<threadobject*, int32_t, bool> {
  67         public:
  68                 bool operator() (const threadobject* t, const int32_t index) const
  69                 {
  70                         return (t->index == index);
  71                 }
  72         };
  73
  74 public:
  75         static void                 lock()   { _mutex.lock(); }
  76         static void                 unlock() { _mutex.unlock(); }
  77
  78         static void                 add_to_active_thread_list(threadobject* t);
  79
  80         // Thread management methods.
  81         static threadobject*        get_main_thread();
  82         static threadobject*        get_free_thread();
  83         static int32_t              get_free_thread_index();
  84         static threadobject*        get_thread_by_index(int32_t index);
  85         static threadobject*        get_thread_from_java_object(java_handle_t* h);
  86         static void                 release_thread(threadobject* t);
  87
  88         // Thread listing methods.
  89         static void                 get_active_threads(List<threadobject*> &list);
  90         static void                 get_active_java_threads(List<threadobject*> &list);
  91
  92         // Thread counting methods visible to Java.
  93         static int32_t              get_number_of_started_java_threads();
  94         static int32_t              get_number_of_active_java_threads();
  95         static int32_t              get_number_of_daemon_java_threads();
  96         static int32_t              get_peak_of_active_java_threads();
  97         static void                 reset_peak_of_active_java_threads();
  98
  99         // Thread counting methods for internal use.
 100         static int32_t              get_number_of_active_threads();
 101         static int32_t              get_number_of_non_daemon_threads();
 102
 103         // Debugging methods.
 104         static void                 dump_threads();
 105 };
 106
 107 struct ThreadListLocker {
 108         ThreadListLocker()  { ThreadList::lock(); }
 109         ~ThreadListLocker()  { ThreadList::unlock(); }
 110 };
 111
 112
 113 inline void ThreadList::add_to_active_thread_list(threadobject* t)
 114 {
 115         lock();
 116         _active_thread_list.push_back(t);
 117
 118         // Update counter variables.
 119         if ((t->flags & THREAD_FLAG_INTERNAL) == 0) {
 120                 _number_of_started_java_threads++;
 121                 _number_of_active_java_threads++;
 122                 _peak_of_active_java_threads = MAX(_peak_of_active_java_threads, _number_of_active_java_threads);
 123         }
 124         unlock();
 125 }
 126
 127 inline void ThreadList::remove_from_active_thread_list(threadobject* t)
 128 {
 129         _active_thread_list.remove(t);
 130
 131         // Update counter variables.
 132         if ((t->flags & THREAD_FLAG_INTERNAL) == 0) {
 133                 _number_of_active_java_threads--;
 134         }
 135 }
 136
 137 inline void ThreadList::add_to_free_thread_list(threadobject* t)
 138 {
 139         _free_thread_list.push_back(t);
 140 }
 141
 142 inline void ThreadList::add_to_free_index_list(int32_t index)
 143 {
 144         _free_index_list.push_back(index);
 145 }
 146
 147 inline threadobject* ThreadList::get_main_thread()
 148 {
 149         return _active_thread_list.front();
 150 }
 151
 152 inline int32_t ThreadList::get_number_of_active_threads()
 153 {
 154         return _active_thread_list.size();
 155 }
 156
 157 inline int32_t ThreadList::get_number_of_started_java_threads()
 158 {
 159         return _number_of_started_java_threads;
 160 }
 161
 162 inline int32_t ThreadList::get_number_of_active_java_threads()
 163 {
 164         return _number_of_active_java_threads;
 165 }
 166
 167 inline int32_t ThreadList::get_peak_of_active_java_threads()
 168 {
 169         return _peak_of_active_java_threads;
 170 }
 171
 172 inline void ThreadList::reset_peak_of_active_java_threads()
 173 {
 174         _peak_of_active_java_threads = _number_of_active_java_threads;
 175 }
 176
 177 #else
 178
 179 typedef struct ThreadList ThreadList;
 180
 181 void ThreadList_lock();
 182 void ThreadList_unlock();
 183 void ThreadList_dump_threads();
 184 void ThreadList_release_thread(threadobject* t);
 185 threadobject* ThreadList_get_free_thread();
 186 int32_t ThreadList_get_free_thread_index();
 187 void ThreadList_add_to_active_thread_list(threadobject* t);
 188 threadobject* ThreadList_get_thread_by_index(int32_t index);
 189 threadobject* ThreadList_get_main_thread();
 190 threadobject* ThreadList_get_thread_from_java_object(java_handle_t* h);
 191 int32_t ThreadList_get_number_of_non_daemon_threads();
 192
 193 #endif
 194
 195 #endif // _THREADLIST_HPP
 196
 197
 198 /*
 199  * These are local overrides for various environment variables in Emacs.
 200  * Please do not remove this and leave it at the end of the file, where
 201  * Emacs will automagically detect them.
 202  * ---------------------------------------------------------------------
 203  * Local variables:
 204  * mode: c++
 205  * indent-tabs-mode: t
 206  * c-basic-offset: 4
 207  * tab-width: 4
 208  * End:
 209  * vim:noexpandtab:sw=4:ts=4:
 210  */