/* LOCKING: assumes the GC lock is held */
int
sgen_stop_world (int generation)
{
TV_DECLARE (end_handshake);
int count, dead;
mono_profiler_gc_event (MONO_GC_EVENT_PRE_STOP_WORLD, generation);
MONO_GC_WORLD_STOP_BEGIN ();
binary_protocol_world_stopping (sgen_timestamp ());
acquire_gc_locks ();
/* We start to scan after locks are taking, this ensures we won't be interrupted. */
sgen_process_togglerefs ();
update_current_thread_stack (&count);
sgen_global_stop_count++;
SGEN_LOG (3, "stopping world n %d from %p %p", sgen_global_stop_count, mono_thread_info_current (), (gpointer)mono_native_thread_id_get ());
TV_GETTIME (stop_world_time);
count = sgen_thread_handshake (TRUE);
dead = restart_threads_until_none_in_managed_allocator ();
if (count < dead)
g_error ("More threads have died (%d) that been initialy suspended %d", dead, count);
count -= dead;
SGEN_LOG (3, "world stopped %d thread(s)", count);
mono_profiler_gc_event (MONO_GC_EVENT_POST_STOP_WORLD, generation);
MONO_GC_WORLD_STOP_END ();
if (binary_protocol_is_enabled ()) {
long long major_total, major_marked, los_total, los_marked;
count_cards (&major_total, &major_marked, &los_total, &los_marked);
binary_protocol_world_stopped (sgen_timestamp (), major_total, major_marked, los_total, los_marked);
}
TV_GETTIME (end_handshake);
time_stop_world += TV_ELAPSED (stop_world_time, end_handshake);
sgen_memgov_collection_start (generation);
if (sgen_need_bridge_processing ())
sgen_bridge_reset_data ();
return count;
}
/*
* Perform consistency check of the heap.
*
* Assumes the world is stopped.
*/
void
sgen_check_consistency (void)
{
// Need to add more checks
missing_remsets = FALSE;
DEBUG (1, fprintf (gc_debug_file, "Begin heap consistency check...\n"));
// Check that oldspace->newspace pointers are registered with the collector
major_collector.iterate_objects (TRUE, TRUE, (IterateObjectCallbackFunc)check_consistency_callback, NULL);
sgen_los_iterate_objects ((IterateObjectCallbackFunc)check_consistency_callback, NULL);
DEBUG (1, fprintf (gc_debug_file, "Heap consistency check done.\n"));
if (!binary_protocol_is_enabled ())
g_assert (!missing_remsets);
}
/* LOCKING: assumes the GC lock is held */
int
sgen_restart_world (int generation, GGTimingInfo *timing)
{
int count;
SgenThreadInfo *info;
TV_DECLARE (end_sw);
TV_DECLARE (start_handshake);
TV_DECLARE (end_bridge);
unsigned long usec, bridge_usec;
if (binary_protocol_is_enabled ()) {
long long major_total, major_marked, los_total, los_marked;
count_cards (&major_total, &major_marked, &los_total, &los_marked);
binary_protocol_world_restarting (generation, sgen_timestamp (), major_total, major_marked, los_total, los_marked);
}
/* notify the profiler of the leftovers */
/* FIXME this is the wrong spot at we can STW for non collection reasons. */
if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_GC_MOVES))
sgen_gc_event_moves ();
mono_profiler_gc_event (MONO_GC_EVENT_PRE_START_WORLD, generation);
MONO_GC_WORLD_RESTART_BEGIN (generation);
FOREACH_THREAD (info) {
info->stack_start = NULL;
#ifdef USE_MONO_CTX
memset (&info->ctx, 0, sizeof (MonoContext));
#else
memset (&info->regs, 0, sizeof (info->regs));
#endif
} END_FOREACH_THREAD
TV_GETTIME (start_handshake);
count = sgen_thread_handshake (FALSE);
TV_GETTIME (end_sw);
time_restart_world += TV_ELAPSED (start_handshake, end_sw);
usec = TV_ELAPSED (stop_world_time, end_sw);
max_pause_usec = MAX (usec, max_pause_usec);
SGEN_LOG (2, "restarted %d thread(s) (pause time: %d usec, max: %d)", count, (int)usec, (int)max_pause_usec);
mono_profiler_gc_event (MONO_GC_EVENT_POST_START_WORLD, generation);
MONO_GC_WORLD_RESTART_END (generation);
binary_protocol_world_restarted (generation, sgen_timestamp ());
/*
* We must release the thread info suspend lock after doing
* the thread handshake. Otherwise, if the GC stops the world
* and a thread is in the process of starting up, but has not
* yet registered (it's not in the thread_list), it is
* possible that the thread does register while the world is
* stopped. When restarting the GC will then try to restart
* said thread, but since it never got the suspend signal, it
* cannot answer the restart signal, so a deadlock results.
*/
release_gc_locks ();
sgen_try_free_some_memory = TRUE;
if (sgen_need_bridge_processing ())
sgen_bridge_processing_finish (generation);
TV_GETTIME (end_bridge);
bridge_usec = TV_ELAPSED (end_sw, end_bridge);
if (timing) {
timing [0].stw_time = usec;
timing [0].bridge_time = bridge_usec;
}
sgen_memgov_collection_end (generation, timing, timing ? 2 : 0);
return count;
}