示例#1
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

	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;
}
示例#2
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;
}