/* 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 (end_bridge);
unsigned long usec, bridge_usec;
/* 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
count = sgen_thread_handshake (FALSE);
TV_GETTIME (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);
/*
* 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;
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;
}
static void
on_gc_notification (GCEventType event)
{
MonoGCEvent e = (MonoGCEvent)event;
switch (e) {
case MONO_GC_EVENT_PRE_STOP_WORLD:
MONO_GC_WORLD_STOP_BEGIN ();
mono_thread_info_suspend_lock ();
break;
case MONO_GC_EVENT_POST_STOP_WORLD:
MONO_GC_WORLD_STOP_END ();
break;
case MONO_GC_EVENT_PRE_START_WORLD:
MONO_GC_WORLD_RESTART_BEGIN (1);
break;
case MONO_GC_EVENT_POST_START_WORLD:
MONO_GC_WORLD_RESTART_END (1);
mono_thread_info_suspend_unlock ();
break;
case MONO_GC_EVENT_START:
MONO_GC_BEGIN (1);
#ifndef DISABLE_PERFCOUNTERS
if (mono_perfcounters)
mono_perfcounters->gc_collections0++;
#endif
gc_stats.major_gc_count ++;
gc_start_time = mono_100ns_ticks ();
break;
case MONO_GC_EVENT_END:
MONO_GC_END (1);
#if defined(ENABLE_DTRACE) && defined(__sun__)
/* This works around a dtrace -G problem on Solaris.
Limit its actual use to when the probe is enabled. */
if (MONO_GC_END_ENABLED ())
sleep(0);
#endif
#ifndef DISABLE_PERFCOUNTERS
if (mono_perfcounters) {
guint64 heap_size = GC_get_heap_size ();
guint64 used_size = heap_size - GC_get_free_bytes ();
mono_perfcounters->gc_total_bytes = used_size;
mono_perfcounters->gc_committed_bytes = heap_size;
mono_perfcounters->gc_reserved_bytes = heap_size;
mono_perfcounters->gc_gen0size = heap_size;
}
#endif
gc_stats.major_gc_time_usecs += (mono_100ns_ticks () - gc_start_time) / 10;
mono_trace_message (MONO_TRACE_GC, "gc took %d usecs", (mono_100ns_ticks () - gc_start_time) / 10);
break;
}
mono_profiler_gc_event (e, 0);
}
/* 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 (end_bridge);
unsigned long usec, bridge_usec;
/* 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
release_gc_locks ();
count = sgen_thread_handshake (FALSE);
TV_GETTIME (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);
mono_thread_hazardous_try_free_some ();
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;
}
