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         static void                 wait_cond(Condition *cond) { cond->wait(_mutex); }
  78
  79         static void                 add_to_active_thread_list(threadobject* t);
  80
  81         // Thread management methods.
  82         static threadobject*        get_main_thread();
  83         static threadobject*        get_free_thread();
  84         static int32_t              get_free_thread_index();
  85         static threadobject*        get_thread_by_index(int32_t index);
  86         static threadobject*        get_thread_from_java_object(java_handle_t* h);
  87         static void                 release_thread(threadobject* t, bool needs_deactivate);
  88         static void                 deactivate_thread(threadobject *t);
  89
  90         // Thread listing methods.
  91         static void                 get_active_threads(List<threadobject*> &list);
  92         static void                 get_active_java_threads(List<threadobject*> &list);
  93
  94         // Thread counting methods visible to Java.
  95         static int32_t              get_number_of_started_java_threads();
  96         static int32_t              get_number_of_active_java_threads();
  97         static int32_t              get_number_of_daemon_java_threads();
  98         static int32_t              get_peak_of_active_java_threads();
  99         static void                 reset_peak_of_active_java_threads();
 100
 101         // Thread counting methods for internal use.
 102         static int32_t              get_number_of_active_threads();
 103         static int32_t              get_number_of_non_daemon_threads();
 104
 105         // Debugging methods.
 106         static void                 dump_threads();
 107 };
 108
 109 struct ThreadListLocker {
 110         ThreadListLocker()  { ThreadList::lock(); }
 111         ~ThreadListLocker()  { ThreadList::unlock(); }
 112 };
 113
 114
 115 inline void ThreadList::add_to_active_thread_list(threadobject* t)
 116 {
 117         lock();
 118         _active_thread_list.push_back(t);
 119         t->is_in_active_list = true;
 120
 121         // Update counter variables.
 122         if ((t->flags & THREAD_FLAG_INTERNAL) == 0) {
 123                 _number_of_started_java_threads++;
 124                 _number_of_active_java_threads++;
 125                 _peak_of_active_java_threads = MAX(_peak_of_active_java_threads, _number_of_active_java_threads);
 126         }
 127         unlock();
 128 }
 129
 130 inline void ThreadList::remove_from_active_thread_list(threadobject* t)
 131 {
 132         lock();
 133         _active_thread_list.remove(t);
 134         t->is_in_active_list = false;
 135
 136         // Update counter variables.
 137         if ((t->flags & THREAD_FLAG_INTERNAL) == 0) {
 138                 _number_of_active_java_threads--;
 139         }
 140         unlock();
 141 }
 142
 143 inline void ThreadList::add_to_free_thread_list(threadobject* t)
 144 {
 145         lock();
 146         _free_thread_list.push_back(t);
 147         unlock();
 148 }
 149
 150 inline void ThreadList::add_to_free_index_list(int32_t index)
 151 {
 152         lock();
 153         _free_index_list.push_back(index);
 154         unlock();
 155 }
 156
 157 inline threadobject* ThreadList::get_main_thread()
 158 {
 159         lock();
 160         threadobject *r = _active_thread_list.front();
 161         unlock();
 162         return r;
 163 }
 164
 165 inline int32_t ThreadList::get_number_of_active_threads()
 166 {
 167         lock();
 168         int32_t size = _active_thread_list.size();
 169         unlock();
 170         return size;
 171 }
 172
 173 inline int32_t ThreadList::get_number_of_started_java_threads()
 174 {
 175         lock();
 176         int32_t num = _number_of_started_java_threads;
 177         unlock();
 178         return num;
 179 }
 180
 181 inline int32_t ThreadList::get_number_of_active_java_threads()
 182 {
 183         lock();
 184         int32_t num = _number_of_active_java_threads;
 185         unlock();
 186         return num;
 187 }
 188
 189 inline int32_t ThreadList::get_peak_of_active_java_threads()
 190 {
 191         lock();
 192         int32_t num = _peak_of_active_java_threads;
 193         unlock();
 194         return num;
 195 }
 196
 197 inline void ThreadList::reset_peak_of_active_java_threads()
 198 {
 199         lock();
 200         _peak_of_active_java_threads = _number_of_active_java_threads;
 201         unlock();
 202 }
 203
 204 #else
 205
 206 typedef struct ThreadList ThreadList;
 207
 208 void ThreadList_lock();
 209 void ThreadList_unlock();
 210 void ThreadList_dump_threads();
 211 threadobject* ThreadList_get_free_thread();
 212 int32_t ThreadList_get_free_thread_index();
 213 void ThreadList_add_to_active_thread_list(threadobject* t);
 214 threadobject* ThreadList_get_thread_by_index(int32_t index);
 215 threadobject* ThreadList_get_main_thread();
 216 threadobject* ThreadList_get_thread_from_java_object(java_handle_t* h);
 217 int32_t ThreadList_get_number_of_non_daemon_threads();
 218
 219 #endif
 220
 221 #endif // _THREADLIST_HPP
 222
 223
 224 /*
 225  * These are local overrides for various environment variables in Emacs.
 226  * Please do not remove this and leave it at the end of the file, where
 227  * Emacs will automagically detect them.
 228  * ---------------------------------------------------------------------
 229  * Local variables:
 230  * mode: c++
 231  * indent-tabs-mode: t
 232  * c-basic-offset: 4
 233  * tab-width: 4
 234  * End:
 235  * vim:noexpandtab:sw=4:ts=4:
 236  */