Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
- $Id: signal.c 7246 2007-01-29 18:49:05Z twisti $
+ $Id: threads-common.c 7875 2007-05-07 11:35:30Z twisti $
*/
#include "config.h"
+
+#include <assert.h>
+
#include "vm/types.h"
#include "native/jni.h"
# include "native/include/java_lang_VMThread.h"
#endif
+#include "threads/critical.h"
+#include "threads/lock-common.h"
#include "threads/threads-common.h"
-#include "threads/native/threads.h"
-
#include "vm/builtin.h"
#include "vm/stringlocal.h"
#include "vm/vm.h"
#include "vm/jit/stacktrace.h"
#include "vmcore/class.h"
+
+#if defined(ENABLE_STATISTICS)
+# include "vmcore/options.h"
+# include "vmcore/statistics.h"
+#endif
+
#include "vmcore/utf8.h"
+/* global variables ***********************************************************/
+
+/* global threads table */
+static threads_table_t threads_table;
+
+
+/* prototypes *****************************************************************/
+
+static void threads_table_init(threadobject *mainthread);
+
+
+/* threads_preinit *************************************************************
+
+ Do some early initialization of stuff required.
+
+ ATTENTION: Do NOT use any Java heap allocation here, as gc_init()
+ is called AFTER this function!
+
+*******************************************************************************/
+
+void threads_preinit(void)
+{
+ threadobject *mainthread;
+
+ /* Initialize the threads implementation (sets the thinlock on the
+ main thread). */
+
+ threads_impl_preinit();
+
+ /* create internal thread data-structure for the main thread */
+
+ mainthread = threads_create_thread();
+
+ mainthread->object = NULL;
+ mainthread->index = 1;
+ mainthread->thinlock = lock_pre_compute_thinlock(mainthread->index);
+
+ /* thread is a Java thread and running */
+
+ mainthread->flags = THREAD_FLAG_JAVA;
+ mainthread->state = THREAD_STATE_RUNNABLE;
+
+ /* store the internal thread data-structure in the TSD */
+
+ threads_set_current_threadobject(mainthread);
+
+ /* initialize the threads table with the main-thread */
+
+ threads_table_init(mainthread);
+
+ /* initialize locking subsystems */
+
+ lock_init();
+
+ /* initialize the critical section */
+
+ critical_init();
+}
+
+
+/* threads_table_init **********************************************************
+
+ Initialize the global threads table. We initialize the table with
+ the main-thread, which has always the index 1.
+
+ IN:
+ mainthread....the main-thread
+
+*******************************************************************************/
+
+#define THREADS_INITIAL_TABLE_SIZE 8
+
+static void threads_table_init(threadobject *mainthread)
+{
+ threads_table_entry_t *ttemain;
+ s4 size;
+ s4 i;
+
+ /* initialize the threads table lock */
+
+ threads_impl_table_init();
+
+ /* initialize the table */
+
+ size = THREADS_INITIAL_TABLE_SIZE;
+
+ threads_table.table = MNEW(threads_table_entry_t, size);
+ threads_table.size = size;
+ threads_table.used = 0;
+ threads_table.daemons = 0;
+
+ /* Link the entries in a freelist. Skip 2 entries: 0 is the
+ free-list header and 1 is the main thread. */
+
+ for (i = 2; i < size; i++) {
+ threads_table.table[i].thread = NULL;
+ threads_table.table[i].next = i + 1;
+ }
+
+ threads_table.table[0].next = 2;
+
+ /* terminate the freelist */
+
+ threads_table.table[size - 1].next = 0; /* index 0 is never free */
+
+ /* insert the main-thread */
+
+ ttemain = &(threads_table.table[1]);
+
+ ttemain->thread = mainthread;
+ ttemain->next = 0;
+
+ /* now 1 entry is used */
+
+ threads_table.used = 1;
+}
+
+
+/* threads_table_add ***********************************************************
+
+ Add a thread to the global threads table. The index is entered in the
+ threadobject. The thinlock value for the thread is pre-computed.
+
+ IN:
+ thread............the thread to add
+
+ RETURN VALUE:
+ The table index for the newly added thread. This value has also been
+ entered in the threadobject.
+
+*******************************************************************************/
+
+s4 threads_table_add(threadobject *thread)
+{
+ threads_table_entry_t *ttefree;
+ threads_table_entry_t *ttemain;
+ threads_table_entry_t *tte;
+ s4 index;
+ s4 oldsize;
+ s4 newsize;
+ s4 i;
+
+ /* lock the threads table */
+
+ threads_table_lock();
+
+ /* get free and main entry */
+
+ ttefree = &(threads_table.table[0]);
+ ttemain = &(threads_table.table[1]);
+
+ /* get the next free index */
+
+ index = ttefree->next;
+
+ /* no entry free anymore? resize the table */
+
+ if (index == 0) {
+ /* we must grow the table */
+
+ oldsize = threads_table.size;
+ newsize = oldsize * 2;
+
+ threads_table.table = MREALLOC(threads_table.table,
+ threads_table_entry_t, oldsize, newsize);
+ threads_table.size = newsize;
+
+ /* the addresses have changed, get them again */
+
+ ttefree = &(threads_table.table[0]);
+ ttemain = &(threads_table.table[1]);
+
+ /* link the new entries to a free list */
+
+ for (i = oldsize; i < newsize; i++) {
+ threads_table.table[i].thread = NULL;
+ threads_table.table[i].next = i + 1;
+ }
+
+ ttefree->next = oldsize;
+
+ /* terminate the freelist */
+
+ threads_table.table[newsize - 1].next = 0; /* index 0 is never free */
+
+ /* use the first of the new entries */
+
+ index = ttefree->next;
+ }
+
+ /* get the entry with the assigned index */
+
+ tte = &(threads_table.table[index]);
+
+ /* store the next free index into the free-list header */
+
+ ttefree->next = tte->next;
+
+ /* store the thread in the table */
+
+ tte->thread = thread;
+
+ /* link the new entry into the used-list */
+
+ tte->next = ttemain->next;
+ ttemain->next = index;
+
+ /* update the counters */
+
+ threads_table.used++;
+
+ if (thread->flags & THREAD_FLAG_DAEMON)
+ threads_table.daemons++;
+
+ assert(threads_table.used < threads_table.size);
+
+ /* set the thread variables */
+
+ thread->index = index;
+ thread->thinlock = lock_pre_compute_thinlock(index);
+
+ /* unlock the threads table */
+
+ threads_table_unlock();
+
+ return index;
+}
+
+
+/* threads_table_remove *******************************************************
+
+ Remove a thread from the global threads table.
+
+ IN:
+ thread............the thread to remove
+
+******************************************************************************/
+
+void threads_table_remove(threadobject *thread)
+{
+ threads_table_entry_t *ttefree;
+ threads_table_entry_t *tte;
+ s4 index;
+ s4 i;
+
+ /* lock the threads table */
+
+ threads_table_lock();
+
+ /* get the free entry */
+
+ ttefree = &(threads_table.table[0]);
+
+ /* get the current entry */
+
+ index = thread->index;
+ tte = &(threads_table.table[index]);
+
+ assert(tte->thread == thread);
+
+ /* Find the entry which has the one to be removed as next entry (I
+ think it's better to do it at the removal in linear time than
+ to have a list or to do it every time we iterate over all
+ threads). */
+
+ for (i = 0; i < threads_table.size; i++) {
+ if (threads_table.table[i].next == index) {
+ threads_table.table[i].next = tte->next;
+ break;
+ }
+ }
+
+ /* clear the thread pointer in the entry */
+
+ tte->thread = NULL;
+
+ /* this entry is free now, add it to the free-list */
+
+ tte->next = ttefree->next;
+ ttefree->next = index;
+
+ /* update the counters */
+
+ threads_table.used--;
+
+ if (thread->flags & THREAD_FLAG_DAEMON)
+ threads_table.daemons--;
+
+ assert(threads_table.used >= 0);
+
+ /* delete the index in the threadobject to discover bugs */
+#if !defined(NDEBUG)
+ thread->index = 0;
+#endif
+
+ /* unlock the threads table */
+
+ threads_table_unlock();
+}
+
+
+/* threads_table_get ***********************************************************
+
+ Return the thread of the given table-entry index.
+
+ NOTE: It is valid to pass and index of 0, as this entry is the
+ free-list header where the thread pointer is always NULL and
+ this is thre expected behavior.
+
+ NOTE: This function does not lock the table.
+
+*******************************************************************************/
+
+static threadobject *threads_table_get(s4 index)
+{
+ threadobject *thread;
+
+ /* get the requested entry */
+
+ assert((index >= 0) && (index < threads_table.size));
+
+ thread = threads_table.table[index].thread;
+
+ return thread;
+}
+
+
+/* threads_table_get_threads ***************************************************
+
+ Return the number of running threads.
+
+ NOTE: This function does not lock the table.
+
+*******************************************************************************/
+
+s4 threads_table_get_threads(void)
+{
+ return threads_table.used;
+}
+
+
+/* threads_table_get_non_daemons ***********************************************
+
+ Return the number of non-daemon threads.
+
+*******************************************************************************/
+
+s4 threads_table_get_non_daemons(void)
+{
+ s4 nondaemons;
+
+ /* lock the threads table */
+
+ threads_table_lock();
+
+ nondaemons = threads_table.used - threads_table.daemons;
+
+ /* unlock the threads table */
+
+ threads_table_unlock();
+
+ return nondaemons;
+}
+
+
+/* threads_table_first *********************************************************
+
+ Return the first thread of the threads table.
+
+ NOTE: This is always the entry with index 1 and must be the main
+ thread.
+
+ NOTE: This function does not lock the table.
+
+*******************************************************************************/
+
+threadobject *threads_table_first(void)
+{
+ threadobject *thread;
+
+ /* get the requested entry */
+
+ thread = threads_table_get(1);
+
+ return thread;
+}
+
+
+/* threads_table_next **********************************************************
+
+ Return the next thread of the threads table relative to the passed
+ one.
+
+ NOTE: This function does not lock the table.
+
+*******************************************************************************/
+
+threadobject *threads_table_next(threadobject *thread)
+{
+ threads_table_entry_t *tte;
+ threadobject *next;
+ s4 index;
+
+ index = thread->index;
+
+ /* get the passed entry */
+
+ assert((index > 0) && (index < threads_table.size));
+
+ tte = &(threads_table.table[index]);
+
+ /* get the requested entry */
+
+ next = threads_table_get(tte->next);
+
+ return next;
+}
+
+
+/* threads_table_dump *********************************************************
+
+ Dump the threads table for debugging purposes.
+
+******************************************************************************/
+
+#if !defined(NDEBUG)
+void threads_table_dump(void)
+{
+ s4 i;
+ s4 size;
+ ptrint index;
+
+ size = threads_table.size;
+
+ log_println("threads table ==========");
+
+ log_println("size: %d", size);
+ log_println("used: %d", threads_table.used);
+ log_println("daemons: %d", threads_table.daemons);
+
+ for (i = 0; i < size; i++) {
+ index = threads_table.table[i].next;
+
+ if (threads_table.table[i].thread != NULL)
+ log_println("%4d: thread=0x%08x, next=%d", i,
+ threads_table.table[i].thread->tid, (int) index);
+ else
+ log_println("%4d: free, next=%d", i, (int) index);
+ }
+
+ log_println("end of threads table ==========");
+}
+#endif
+
+
/* threads_create_thread *******************************************************
- Creates a thread object with the given name.
+ Creates and initializes an internal thread data-structure.
*******************************************************************************/
-threadobject *threads_create_thread(utf *name)
+threadobject *threads_create_thread(void)
+{
+ threadobject *thread;
+
+ /* allocate internal thread data-structure */
+
+#if defined(ENABLE_GC_BOEHM)
+ thread = GCNEW_UNCOLLECTABLE(threadobject, 1);
+#else
+ thread = NEW(threadobject);
+#endif
+
+#if defined(ENABLE_STATISTICS)
+ if (opt_stat)
+ size_threadobject += sizeof(threadobject);
+#endif
+
+ /* initialize thread data structure */
+
+ threads_init_threadobject(thread);
+ lock_init_execution_env(thread);
+
+ return thread;
+}
+
+
+/* threads_thread_start_internal ***********************************************
+
+ Start an internal thread in the JVM. No Java thread objects exists
+ so far.
+
+ IN:
+ name.......UTF-8 name of the thread
+ f..........function pointer to C function to start
+
+*******************************************************************************/
+
+bool threads_thread_start_internal(utf *name, functionptr f)
{
threadobject *thread;
java_lang_Thread *t;
java_lang_VMThread *vmt;
#endif
- /* create the vm internal thread object */
-
- thread = NEW(threadobject);
+ /* create internal thread data-structure */
- if (thread == NULL)
- return NULL;
+ thread = threads_create_thread();
/* create the java thread object */
t = (java_lang_Thread *) builtin_new(class_java_lang_Thread);
if (t == NULL)
- return NULL;
+ return false;
#if defined(WITH_CLASSPATH_GNU)
vmt = (java_lang_VMThread *) builtin_new(class_java_lang_VMThread);
if (vmt == NULL)
- return NULL;
+ return false;
vmt->thread = t;
vmt->vmdata = (java_lang_Object *) thread;
#endif
t->priority = NORM_PRIORITY;
- /* return the thread object */
+ /* start the thread */
- return thread;
+ threads_impl_thread_start(thread, f);
+
+ /* everything's ok */
+
+ return true;
+}
+
+
+/* threads_thread_start ********************************************************
+
+ Start a Java thread in the JVM. Only the java thread object exists
+ so far.
+
+ IN:
+ object.....the java thread object java.lang.Thread
+
+*******************************************************************************/
+
+void threads_thread_start(java_lang_Thread *object)
+{
+ threadobject *thread;
+
+ /* create internal thread data-structure */
+
+ thread = threads_create_thread();
+
+ /* link the two objects together */
+
+ thread->object = object;
+
+#if defined(ENABLE_JAVASE)
+ /* is this a daemon thread? */
+
+ if (object->daemon == true)
+ thread->flags |= THREAD_FLAG_DAEMON;
+#endif
+
+#if defined(WITH_CLASSPATH_GNU)
+ assert(object->vmThread);
+ assert(object->vmThread->vmdata == NULL);
+
+ object->vmThread->vmdata = (java_lang_Object *) thread;
+#elif defined(WITH_CLASSPATH_CLDC1_1)
+ object->vm_thread = (java_lang_Object *) thread;
+#endif
+
+ /* Start the thread. Don't pass a function pointer (NULL) since
+ we want Thread.run()V here. */
+
+ threads_impl_thread_start(thread, NULL);
}
void threads_dump(void)
{
- threadobject *thread;
- java_lang_Thread *t;
+ threadobject *t;
+ java_lang_Thread *object;
utf *name;
- thread = mainthreadobj;
-
/* XXX we should stop the world here */
+ /* lock the threads table */
+
+ threads_table_lock();
+
printf("Full thread dump CACAO "VERSION":\n");
/* iterate over all started threads */
- do {
+ for (t = threads_table_first(); t != NULL; t = threads_table_next(t)) {
/* get thread object */
- t = thread->object;
+ object = t->object;
/* the thread may be currently in initalization, don't print it */
- if (t != NULL) {
+ if (object != NULL) {
/* get thread name */
#if defined(ENABLE_JAVASE)
- name = javastring_toutf((java_objectheader *) t->name, false);
+ name = javastring_toutf((java_objectheader *) object->name, false);
#elif defined(ENABLE_JAVAME_CLDC1_1)
- name = t->name;
+ name = object->name;
#endif
printf("\n\"");
if (thread->flags & THREAD_FLAG_DAEMON)
printf(" daemon");
- printf(" prio=%d", t->priority);
+ printf(" prio=%d", object->priority);
#if SIZEOF_VOID_P == 8
- printf(" tid=0x%016lx", (ptrint) thread->tid);
+ printf(" tid=0x%016lx (%ld)", (ptrint) t->tid, (ptrint) t->tid);
#else
- printf(" tid=0x%08lx", (ptrint) thread->tid);
+ printf(" tid=0x%08x (%d)", (ptrint) t->tid, (ptrint) t->tid);
#endif
/* print thread state */
- switch (thread->state) {
+ switch (t->state) {
case THREAD_STATE_NEW:
printf(" new");
break;
printf(" terminated");
break;
default:
- vm_abort("threads_dump: unknown thread state %d",
- thread->state);
+ vm_abort("threads_dump: unknown thread state %d", t->state);
}
printf("\n");
/* print trace of thread */
- threads_thread_print_stacktrace(thread);
+ threads_thread_print_stacktrace(t);
}
+ }
+
+ /* unlock the threads table */
- thread = thread->next;
- } while ((thread != NULL) && (thread != mainthreadobj));
+ threads_table_unlock();
}
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