-/*
- * sgen-workers.c: Worker threads for parallel and concurrent GC.
+/**
+ * \file
+ * Worker threads for parallel and concurrent GC.
*
* Copyright 2001-2003 Ximian, Inc
* Copyright 2003-2010 Novell, Inc.
#include "mono/sgen/sgen-client.h"
static int workers_num;
+static int active_workers_num;
static volatile gboolean forced_stop;
static WorkerData *workers_data;
static SgenWorkerCallback worker_init_cb;
+static SgenThreadPool pool_inst;
+static SgenThreadPool *pool; /* null if we're not using workers */
+
/*
* When using multiple workers, we need to have the last worker
* enqueue the preclean jobs (if there are any). This lock ensures
* gracefully finished, so it can restart them.
*/
static mono_mutex_t finished_lock;
+static volatile gboolean workers_finished;
+static int worker_awakenings;
static SgenSectionGrayQueue workers_distribute_gray_queue;
static gboolean workers_distribute_gray_queue_inited;
STATE_WORK_ENQUEUED
};
+#define SGEN_WORKER_MIN_SECTIONS_SIGNAL 4
+
typedef gint32 State;
static SgenObjectOperations * volatile idle_func_object_ops;
else if (new_state == STATE_WORKING)
SGEN_ASSERT (0, old_state == STATE_WORK_ENQUEUED, "We can only transition to WORKING from WORK ENQUEUED");
if (new_state == STATE_NOT_WORKING || new_state == STATE_WORKING)
- SGEN_ASSERT (6, sgen_thread_pool_is_thread_pool_thread (mono_native_thread_id_get ()), "Only the worker thread is allowed to transition to NOT_WORKING or WORKING");
+ SGEN_ASSERT (6, sgen_thread_pool_is_thread_pool_thread (pool, mono_native_thread_id_get ()), "Only the worker thread is allowed to transition to NOT_WORKING or WORKING");
return InterlockedCompareExchange (&data->state, new_state, old_state) == old_state;
}
* or when the last worker is enqueuing preclean work. In both cases we can't
* have a worker working using a nopar context, which means it is safe.
*/
- idle_func_object_ops = (workers_num > 1) ? idle_func_object_ops_par : idle_func_object_ops_nopar;
+ idle_func_object_ops = (active_workers_num > 1) ? idle_func_object_ops_par : idle_func_object_ops_nopar;
+ workers_finished = FALSE;
- for (i = 0; i < workers_num; i++) {
+ for (i = 0; i < active_workers_num; i++) {
State old_state;
gboolean did_set_state;
}
if (need_signal)
- sgen_thread_pool_idle_signal ();
+ sgen_thread_pool_idle_signal (pool);
}
static void
mono_os_mutex_lock (&finished_lock);
- for (i = 0; i < workers_num; i++) {
+ for (i = 0; i < active_workers_num; i++) {
if (state_is_working_or_enqueued (workers_data [i].state))
working++;
}
if (callback) {
finish_callback = NULL;
callback ();
+ worker_awakenings = 0;
/* Make sure each worker has a chance of seeing the enqueued jobs */
sgen_workers_ensure_awake ();
SGEN_ASSERT (0, data->state == STATE_WORK_ENQUEUED, "Why did we fail to set our own state to ENQUEUED");
if (working == 2)
idle_func_object_ops = idle_func_object_ops_nopar;
+ workers_finished = TRUE;
mono_os_mutex_unlock (&finished_lock);
binary_protocol_worker_finish (sgen_timestamp (), forced_stop);
return;
}
- sgen_thread_pool_job_enqueue (job);
+ sgen_thread_pool_job_enqueue (pool, job);
}
static gboolean
workers_get_work (WorkerData *data)
{
- SgenMajorCollector *major;
+ SgenMajorCollector *major = sgen_get_major_collector ();
+ SgenMinorCollector *minor = sgen_get_minor_collector ();
+ GrayQueueSection *section;
g_assert (sgen_gray_object_queue_is_empty (&data->private_gray_queue));
+ g_assert (major->is_concurrent || minor->is_parallel);
- /* If we're concurrent, steal from the workers distribute gray queue. */
- major = sgen_get_major_collector ();
- if (major->is_concurrent) {
- GrayQueueSection *section = sgen_section_gray_queue_dequeue (&workers_distribute_gray_queue);
- if (section) {
- sgen_gray_object_enqueue_section (&data->private_gray_queue, section, major->is_parallel);
- return TRUE;
- }
+ section = sgen_section_gray_queue_dequeue (&workers_distribute_gray_queue);
+ if (section) {
+ sgen_gray_object_enqueue_section (&data->private_gray_queue, section, major->is_parallel);
+ return TRUE;
}
/* Nobody to steal from */
workers_steal_work (WorkerData *data)
{
SgenMajorCollector *major = sgen_get_major_collector ();
+ SgenMinorCollector *minor = sgen_get_minor_collector ();
+ int generation = sgen_get_current_collection_generation ();
GrayQueueSection *section = NULL;
int i, current_worker;
- if (!major->is_parallel)
+ if ((generation == GENERATION_OLD && !major->is_parallel) ||
+ (generation == GENERATION_NURSERY && !minor->is_parallel))
return FALSE;
/* If we're parallel, steal from other workers' private gray queues */
current_worker = (int) (data - workers_data);
- for (i = 1; i < workers_num && !section; i++) {
- int steal_worker = (current_worker + i) % workers_num;
+ for (i = 1; i < active_workers_num && !section; i++) {
+ int steal_worker = (current_worker + i) % active_workers_num;
if (state_is_working_or_enqueued (workers_data [steal_worker].state))
section = sgen_gray_object_steal_section (&workers_data [steal_worker].private_gray_queue);
}
{
WorkerData *data = (WorkerData *)data_untyped;
SgenMajorCollector *major = sgen_get_major_collector ();
+ SgenMinorCollector *minor = sgen_get_minor_collector ();
sgen_client_thread_register_worker ();
- if (!major->is_concurrent)
+ if (!major->is_concurrent && !minor->is_parallel)
return;
init_private_gray_queue (data);
}
}
+static gboolean
+should_work_func (void *data_untyped)
+{
+ WorkerData *data = (WorkerData*)data_untyped;
+ int current_worker = (int) (data - workers_data);
+
+ return current_worker < active_workers_num;
+}
+
static void
marker_idle_func (void *data_untyped)
{
WorkerData *data = (WorkerData *)data_untyped;
SGEN_ASSERT (0, continue_idle_func (data_untyped), "Why are we called when we're not supposed to work?");
- SGEN_ASSERT (0, sgen_concurrent_collection_in_progress (), "The worker should only mark in concurrent collections.");
if (data->state == STATE_WORK_ENQUEUED) {
set_state (data, STATE_WORK_ENQUEUED, STATE_WORKING);
SGEN_ASSERT (0, !sgen_gray_object_queue_is_empty (&data->private_gray_queue), "How is our gray queue empty if we just got work?");
sgen_drain_gray_stack (ctx);
+
+ if (data->private_gray_queue.num_sections >= SGEN_WORKER_MIN_SECTIONS_SIGNAL
+ && workers_finished && worker_awakenings < active_workers_num) {
+ /* We bound the number of worker awakenings just to be sure */
+ worker_awakenings++;
+ mono_os_mutex_lock (&finished_lock);
+ sgen_workers_ensure_awake ();
+ mono_os_mutex_unlock (&finished_lock);
+ }
} else {
worker_try_finish (data);
}
void
sgen_workers_init_distribute_gray_queue (void)
{
- SGEN_ASSERT (0, sgen_get_major_collector ()->is_concurrent,
+ SGEN_ASSERT (0, sgen_get_major_collector ()->is_concurrent || sgen_get_minor_collector ()->is_parallel,
"Why should we init the distribute gray queue if we don't need it?");
init_distribute_gray_queue ();
}
sgen_workers_init (int num_workers, SgenWorkerCallback callback)
{
int i;
- void **workers_data_ptrs = (void **)alloca(num_workers * sizeof(void *));
-
- if (!sgen_get_major_collector ()->is_concurrent) {
- sgen_thread_pool_init (num_workers, thread_pool_init_func, NULL, NULL, NULL);
- return;
- }
+ WorkerData **workers_data_ptrs = (WorkerData**)alloca(num_workers * sizeof(WorkerData*));
mono_os_mutex_init (&finished_lock);
//g_print ("initing %d workers\n", num_workers);
workers_num = num_workers;
+ active_workers_num = num_workers;
workers_data = (WorkerData *)sgen_alloc_internal_dynamic (sizeof (WorkerData) * num_workers, INTERNAL_MEM_WORKER_DATA, TRUE);
memset (workers_data, 0, sizeof (WorkerData) * num_workers);
init_distribute_gray_queue ();
for (i = 0; i < num_workers; ++i)
- workers_data_ptrs [i] = (void *) &workers_data [i];
+ workers_data_ptrs [i] = &workers_data [i];
worker_init_cb = callback;
- sgen_thread_pool_init (num_workers, thread_pool_init_func, marker_idle_func, continue_idle_func, workers_data_ptrs);
+ pool = &pool_inst;
+ sgen_thread_pool_init (pool, num_workers, thread_pool_init_func, marker_idle_func, continue_idle_func, should_work_func, (SgenThreadPoolData**)workers_data_ptrs);
mono_counters_register ("# workers finished", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_workers_num_finished);
}
+void
+sgen_workers_shutdown (void)
+{
+ if (pool)
+ sgen_thread_pool_shutdown (pool);
+}
+
void
sgen_workers_stop_all_workers (void)
{
mono_memory_write_barrier ();
forced_stop = TRUE;
- sgen_thread_pool_wait_for_all_jobs ();
- sgen_thread_pool_idle_wait ();
+ sgen_thread_pool_wait_for_all_jobs (pool);
+ sgen_thread_pool_idle_wait (pool);
SGEN_ASSERT (0, sgen_workers_all_done (), "Can only signal enqueue work when in no work state");
}
+void
+sgen_workers_set_num_active_workers (int num_workers)
+{
+ if (num_workers) {
+ SGEN_ASSERT (0, active_workers_num <= workers_num, "We can't start more workers than we initialized");
+ active_workers_num = num_workers;
+ } else {
+ active_workers_num = workers_num;
+ }
+}
+
void
sgen_workers_start_all_workers (SgenObjectOperations *object_ops_nopar, SgenObjectOperations *object_ops_par, SgenWorkersFinishCallback callback)
{
idle_func_object_ops_nopar = object_ops_nopar;
forced_stop = FALSE;
finish_callback = callback;
+ worker_awakenings = 0;
mono_memory_write_barrier ();
+ /*
+ * We expect workers to start finishing only after all of them were awaken.
+ * Otherwise we might think that we have fewer workers and use wrong context.
+ */
+ mono_os_mutex_lock (&finished_lock);
sgen_workers_ensure_awake ();
+ mono_os_mutex_unlock (&finished_lock);
}
void
{
int i;
- sgen_thread_pool_wait_for_all_jobs ();
- sgen_thread_pool_idle_wait ();
+ sgen_thread_pool_wait_for_all_jobs (pool);
+ sgen_thread_pool_idle_wait (pool);
SGEN_ASSERT (0, sgen_workers_all_done (), "Can only signal enqueue work when in no work state");
/* At this point all the workers have stopped. */
SGEN_ASSERT (0, sgen_section_gray_queue_is_empty (&workers_distribute_gray_queue), "Why is there still work left to do?");
- for (i = 0; i < workers_num; ++i)
+ for (i = 0; i < active_workers_num; ++i)
SGEN_ASSERT (0, sgen_gray_object_queue_is_empty (&workers_data [i].private_gray_queue), "Why is there still work left to do?");
}
if (!sgen_section_gray_queue_is_empty (&workers_distribute_gray_queue))
return TRUE;
- for (i = 0; i < workers_num; ++i) {
+ for (i = 0; i < active_workers_num; ++i) {
if (!sgen_gray_object_queue_is_empty (&workers_data [i].private_gray_queue))
return TRUE;
}
{
int i;
- for (i = 0; i < workers_num; i++) {
+ for (i = 0; i < active_workers_num; i++) {
if (state_is_working_or_enqueued (workers_data [i].state))
return FALSE;
}
int
sgen_workers_get_job_split_count (void)
{
- return (workers_num > 1) ? workers_num * 4 : 1;
+ return (active_workers_num > 1) ? active_workers_num * 4 : 1;
}
void
callback (&workers_data [i]);
}
+gboolean
+sgen_workers_is_worker_thread (MonoNativeThreadId id)
+{
+ if (!pool)
+ return FALSE;
+ return sgen_thread_pool_is_thread_pool_thread (pool, id);
+}
+
#endif
projects / mono.git / blobdiff