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, bool needs_deactivate);
  87         static void                 deactivate_thread(threadobject *t);
  88
  89         // Thread listing methods.
  90         static void                 get_active_threads(List<threadobject*> &list);
  91         static void                 get_active_java_threads(List<threadobject*> &list);
  92
  93         // Thread counting methods visible to Java.
  94         static int32_t              get_number_of_started_java_threads();
  95         static int32_t              get_number_of_active_java_threads();
  96         static int32_t              get_number_of_daemon_java_threads();
  97         static int32_t              get_peak_of_active_java_threads();
  98         static void                 reset_peak_of_active_java_threads();
  99
 100         // Thread counting methods for internal use.
 101         static int32_t              get_number_of_active_threads();
 102         static int32_t              get_number_of_non_daemon_threads();
 103
 104         // Debugging methods.
 105         static void                 dump_threads();
 106 };
 107
 108 struct ThreadListLocker {
 109         ThreadListLocker()  { ThreadList::lock(); }
 110         ~ThreadListLocker()  { ThreadList::unlock(); }
 111 };
 112
 113
 114 inline void ThreadList::add_to_active_thread_list(threadobject* t)
 115 {
 116         lock();
 117         _active_thread_list.push_back(t);
 118         t->is_in_active_list = true;
 119
 120         // Update counter variables.
 121         if ((t->flags & THREAD_FLAG_INTERNAL) == 0) {
 122                 _number_of_started_java_threads++;
 123                 _number_of_active_java_threads++;
 124                 _peak_of_active_java_threads = MAX(_peak_of_active_java_threads, _number_of_active_java_threads);
 125         }
 126         unlock();
 127 }
 128
 129 inline void ThreadList::remove_from_active_thread_list(threadobject* t)
 130 {
 131         lock();
 132         _active_thread_list.remove(t);
 133         t->is_in_active_list = false;
 134
 135         // Update counter variables.
 136         if ((t->flags & THREAD_FLAG_INTERNAL) == 0) {
 137                 _number_of_active_java_threads--;
 138         }
 139         unlock();
 140 }
 141
 142 inline void ThreadList::add_to_free_thread_list(threadobject* t)
 143 {
 144         lock();
 145         _free_thread_list.push_back(t);
 146         unlock();
 147 }
 148
 149 inline void ThreadList::add_to_free_index_list(int32_t index)
 150 {
 151         lock();
 152         _free_index_list.push_back(index);
 153         unlock();
 154 }
 155
 156 inline threadobject* ThreadList::get_main_thread()
 157 {
 158         lock();
 159         threadobject *r = _active_thread_list.front();
 160         unlock();
 161         return r;
 162 }
 163
 164 inline int32_t ThreadList::get_number_of_active_threads()
 165 {
 166         lock();
 167         int32_t size = _active_thread_list.size();
 168         unlock();
 169         return size;
 170 }
 171
 172 inline int32_t ThreadList::get_number_of_started_java_threads()
 173 {
 174         lock();
 175         int32_t num = _number_of_started_java_threads;
 176         unlock();
 177         return num;
 178 }
 179
 180 inline int32_t ThreadList::get_number_of_active_java_threads()
 181 {
 182         lock();
 183         int32_t num = _number_of_active_java_threads;
 184         unlock();
 185         return num;
 186 }
 187
 188 inline int32_t ThreadList::get_peak_of_active_java_threads()
 189 {
 190         lock();
 191         int32_t num = _peak_of_active_java_threads;
 192         unlock();
 193         return num;
 194 }
 195
 196 inline void ThreadList::reset_peak_of_active_java_threads()
 197 {
 198         lock();
 199         _peak_of_active_java_threads = _number_of_active_java_threads;
 200         unlock();
 201 }
 202
 203 #else
 204
 205 typedef struct ThreadList ThreadList;
 206
 207 void ThreadList_lock();
 208 void ThreadList_unlock();
 209 void ThreadList_dump_threads();
 210 threadobject* ThreadList_get_free_thread();
 211 int32_t ThreadList_get_free_thread_index();
 212 void ThreadList_add_to_active_thread_list(threadobject* t);
 213 threadobject* ThreadList_get_thread_by_index(int32_t index);
 214 threadobject* ThreadList_get_main_thread();
 215 threadobject* ThreadList_get_thread_from_java_object(java_handle_t* h);
 216 int32_t ThreadList_get_number_of_non_daemon_threads();
 217
 218 #endif
 219
 220 #endif // _THREADLIST_HPP
 221
 222
 223 /*
 224  * These are local overrides for various environment variables in Emacs.
 225  * Please do not remove this and leave it at the end of the file, where
 226  * Emacs will automagically detect them.
 227  * ---------------------------------------------------------------------
 228  * Local variables:
 229  * mode: c++
 230  * indent-tabs-mode: t
 231  * c-basic-offset: 4
 232  * tab-width: 4
 233  * End:
 234  * vim:noexpandtab:sw=4:ts=4:
 235  */