1 /* src/threads/threadlist.cpp - thread list
4 CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO
6 This file is part of CACAO.
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.
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.
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
32 #include "threads/mutex.hpp"
33 #include "threads/threadlist.hpp"
34 #include "threads/thread.hpp"
36 #include "toolbox/list.hpp"
37 #include "toolbox/logging.hpp"
39 #include "vm/jit/stacktrace.hpp"
44 Mutex ThreadList::_mutex; // a mutex for all thread lists
46 List<threadobject*> ThreadList::_active_thread_list; // list of active threads
47 List<threadobject*> ThreadList::_free_thread_list; // list of free threads
48 List<int32_t> ThreadList::_free_index_list; // list of free thread indexes
50 int32_t ThreadList::_number_of_non_daemon_threads;
54 * Dumps info for all threads running in the VM. This function is
55 * called when SIGQUIT (<ctrl>-\) is sent to the VM.
57 void ThreadList::dump_threads()
59 // XXX we should stop the world here
60 // Lock the thread lists.
63 printf("Full thread dump CACAO "VERSION":\n");
65 // Iterate over all started threads.
66 for (List<threadobject*>::iterator it = _active_thread_list.begin(); it != _active_thread_list.end(); it++) {
67 threadobject* t = *it;
69 // Ignore threads which are in state NEW.
70 if (t->state == THREAD_STATE_NEW)
73 #if defined(ENABLE_GC_CACAO)
74 /* Suspend the thread. */
75 /* XXX Is the suspend reason correct? */
77 if (threads_suspend_thread(t, SUSPEND_REASON_JNI) == false)
78 vm_abort("threads_dump: threads_suspend_thread failed");
81 /* Print thread info. */
87 /* Print trace of thread. */
89 stacktrace_print_of_thread(t);
91 #if defined(ENABLE_GC_CACAO)
92 /* Resume the thread. */
94 if (threads_resume_thread(t) == false)
95 vm_abort("threads_dump: threads_resume_thread failed");
99 // Unlock the thread lists.
105 * Fills the passed list with all currently active threads. Creating a copy
106 * of the thread list here, is the only way to ensure we do not end up in a
107 * dead-lock when iterating over the list.
109 * @param list list class to be filled
111 void ThreadList::get_active_threads(List<threadobject*> &list)
113 // Lock the thread lists.
116 // Use the assignment operator to create a copy of the thread list.
117 list = _active_thread_list;
119 // Unlock the thread lists.
125 * Return a free thread object.
127 * @return free thread object or NULL if none available
129 threadobject* ThreadList::get_free_thread()
131 threadobject* t = NULL;
133 // Do we have free threads in the free-list?
134 if (_free_thread_list.empty() == false) {
135 // Yes, get the index and remove it from the free list.
136 threadobject* t = _free_thread_list.front();
137 _free_thread_list.remove(t);
145 * Return a free thread index.
147 * @return free thread index
149 int32_t ThreadList::get_free_thread_index()
153 // Do we have free indexes in the free-list?
154 if (_free_index_list.empty() == false) {
155 // Yes, get the index and remove it from the free list.
156 index = _free_index_list.front();
157 _free_index_list.remove(index);
160 // Get a new the thread index.
161 index = _active_thread_list.size() + 1;
169 * Return the number of non-daemon threads.
171 * NOTE: This function does a linear-search over the threads list,
172 * because it is only used for joining the threads.
174 * @return number of non daemon threads
176 int32_t ThreadList::get_number_of_non_daemon_threads(void)
182 for (List<threadobject*>::iterator it = _active_thread_list.begin(); it != _active_thread_list.end(); it++) {
183 threadobject* t = *it;
185 if (!thread_is_daemon(t))
196 * Return the thread object with the given index.
198 * @return thread object
200 threadobject* ThreadList::get_thread_by_index(int32_t index)
204 List<threadobject*>::iterator it = find_if(_active_thread_list.begin(), _active_thread_list.end(), std::bind2nd(comparator(), index));
207 if (it == _active_thread_list.end()) {
212 threadobject* t = *it;
214 // The thread found is in state new.
215 if (t->state == THREAD_STATE_NEW) {
226 * Return the Java thread object from the given thread object.
228 * @return Java thread object
230 threadobject* ThreadList::get_thread_from_java_object(java_handle_t* h)
232 List<threadobject*>::iterator it;
238 for (it = _active_thread_list.begin(); it != _active_thread_list.end(); it++) {
241 LLNI_equals(t->object, h, equal);
256 * Release the thread.
258 * @return free thread index
260 void ThreadList::release_thread(threadobject* t)
264 // Move thread from active thread list to free thread list.
265 remove_from_active_thread_list(t);
266 add_to_free_thread_list(t);
268 // Add thread index to free index list.
269 add_to_free_index_list(t->index);
275 /* C interface functions ******************************************************/
278 void ThreadList_lock() { ThreadList::lock(); }
279 void ThreadList_unlock() { ThreadList::unlock(); }
280 void ThreadList_dump_threads() { ThreadList::dump_threads(); }
281 void ThreadList_release_thread(threadobject* t) { ThreadList::release_thread(t); }
282 threadobject* ThreadList_get_free_thread() { return ThreadList::get_free_thread(); }
283 int32_t ThreadList_get_free_thread_index() { return ThreadList::get_free_thread_index(); }
284 void ThreadList_add_to_active_thread_list(threadobject* t) { ThreadList::add_to_active_thread_list(t); }
285 threadobject* ThreadList_get_thread_by_index(int32_t index) { return ThreadList::get_thread_by_index(index); }
286 threadobject* ThreadList_get_main_thread() { return ThreadList::get_main_thread(); }
287 threadobject* ThreadList_get_thread_from_java_object(java_handle_t* h) { return ThreadList::get_thread_from_java_object(h); }
289 int32_t ThreadList_get_number_of_non_daemon_threads() { return ThreadList::get_number_of_non_daemon_threads(); }
293 * These are local overrides for various environment variables in Emacs.
294 * Please do not remove this and leave it at the end of the file, where
295 * Emacs will automagically detect them.
296 * ---------------------------------------------------------------------
299 * indent-tabs-mode: t
303 * vim:noexpandtab:sw=4:ts=4: