-/*
- * 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/utils/mono-membar.h"
#include "mono/sgen/sgen-client.h"
-static int workers_num;
-static volatile gboolean forced_stop;
-static WorkerData *workers_data;
-
-static SgenSectionGrayQueue workers_distribute_gray_queue;
-static gboolean workers_distribute_gray_queue_inited;
+static WorkerContext worker_contexts [GENERATION_MAX];
/*
* Allowed transitions:
*
* | from \ to | NOT WORKING | WORKING | WORK ENQUEUED |
* |--------------------+-------------+---------+---------------+
- * | NOT WORKING | - | - | main |
- * | WORKING | worker | - | main |
+ * | NOT WORKING | - | - | main / worker |
+ * | WORKING | worker | - | main / worker |
* | WORK ENQUEUED | - | worker | - |
*
* The WORK ENQUEUED state guarantees that the worker thread will inspect the queue again at
STATE_WORK_ENQUEUED
};
-typedef gint32 State;
-
-static volatile State workers_state;
-
-static SgenObjectOperations * volatile idle_func_object_ops;
-static SgenThreadPoolJob * volatile preclean_job;
+#define SGEN_WORKER_MIN_SECTIONS_SIGNAL 4
static guint64 stat_workers_num_finished;
static gboolean
-set_state (State old_state, State new_state)
+set_state (WorkerData *data, State old_state, State new_state)
{
SGEN_ASSERT (0, old_state != new_state, "Why are we transitioning to the same state?");
if (new_state == STATE_NOT_WORKING)
SGEN_ASSERT (0, old_state == STATE_WORKING, "We can only transition to NOT WORKING from WORKING");
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");
- return InterlockedCompareExchange (&workers_state, new_state, old_state) == old_state;
+ return InterlockedCompareExchange (&data->state, new_state, old_state) == old_state;
}
static gboolean
}
static void
-sgen_workers_ensure_awake (void)
+sgen_workers_ensure_awake (WorkerContext *context)
{
- State old_state;
- gboolean did_set_state;
+ int i;
+ gboolean need_signal = FALSE;
- do {
- old_state = workers_state;
+ /*
+ * All workers are awaken, make sure we reset the parallel context.
+ * We call this function only when starting the workers so nobody is running,
+ * 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.
+ */
+ context->idle_func_object_ops = (context->active_workers_num > 1) ? context->idle_func_object_ops_par : context->idle_func_object_ops_nopar;
+ context->workers_finished = FALSE;
- if (old_state == STATE_WORK_ENQUEUED)
- break;
+ for (i = 0; i < context->active_workers_num; i++) {
+ State old_state;
+ gboolean did_set_state;
+
+ do {
+ old_state = context->workers_data [i].state;
+
+ if (old_state == STATE_WORK_ENQUEUED)
+ break;
+
+ did_set_state = set_state (&context->workers_data [i], old_state, STATE_WORK_ENQUEUED);
- did_set_state = set_state (old_state, STATE_WORK_ENQUEUED);
- } while (!did_set_state);
+ if (did_set_state && old_state == STATE_NOT_WORKING)
+ context->workers_data [i].last_start = sgen_timestamp ();
+ } while (!did_set_state);
- if (!state_is_working_or_enqueued (old_state))
- sgen_thread_pool_idle_signal ();
+ if (!state_is_working_or_enqueued (old_state))
+ need_signal = TRUE;
+ }
+
+ if (need_signal)
+ sgen_thread_pool_idle_signal (context->thread_pool_context);
}
static void
worker_try_finish (WorkerData *data)
{
State old_state;
+ int i, working = 0;
+ WorkerContext *context = data->context;
+ gint64 last_start = data->last_start;
++stat_workers_num_finished;
+ mono_os_mutex_lock (&context->finished_lock);
+
+ for (i = 0; i < context->active_workers_num; i++) {
+ if (state_is_working_or_enqueued (context->workers_data [i].state))
+ working++;
+ }
+
+ if (working == 1) {
+ SgenWorkersFinishCallback callback = context->finish_callback;
+ SGEN_ASSERT (0, context->idle_func_object_ops == context->idle_func_object_ops_nopar, "Why are we finishing with parallel context");
+ /* We are the last one left. Enqueue preclean job if we have one and awake everybody */
+ SGEN_ASSERT (0, data->state != STATE_NOT_WORKING, "How did we get from doing idle work to NOT WORKING without setting it ourselves?");
+ if (callback) {
+ context->finish_callback = NULL;
+ callback ();
+ context->worker_awakenings = 0;
+ /* Make sure each worker has a chance of seeing the enqueued jobs */
+ sgen_workers_ensure_awake (context);
+ SGEN_ASSERT (0, data->state == STATE_WORK_ENQUEUED, "Why did we fail to set our own state to ENQUEUED");
+
+ /*
+ * Log to be able to get the duration of normal concurrent M&S phase.
+ * Worker indexes are 1 based, since 0 is logically considered gc thread.
+ */
+ binary_protocol_worker_finish_stats (data - &context->workers_data [0] + 1, context->generation, context->forced_stop, data->major_scan_time, data->los_scan_time, data->total_time + sgen_timestamp () - last_start);
+ goto work_available;
+ }
+ }
+
do {
- old_state = workers_state;
+ old_state = data->state;
SGEN_ASSERT (0, old_state != STATE_NOT_WORKING, "How did we get from doing idle work to NOT WORKING without setting it ourselves?");
if (old_state == STATE_WORK_ENQUEUED)
- return;
+ goto work_available;
SGEN_ASSERT (0, old_state == STATE_WORKING, "What other possibility is there?");
+ } while (!set_state (data, old_state, STATE_NOT_WORKING));
- /* We are the last thread to go to sleep. */
- } while (!set_state (old_state, STATE_NOT_WORKING));
+ /*
+ * If we are second to last to finish, we set the scan context to the non-parallel
+ * version so we can speed up the last worker. This helps us maintain same level
+ * of performance as non-parallel mode even if we fail to distribute work properly.
+ */
+ if (working == 2)
+ context->idle_func_object_ops = context->idle_func_object_ops_nopar;
+
+ context->workers_finished = TRUE;
+ mono_os_mutex_unlock (&context->finished_lock);
- binary_protocol_worker_finish (sgen_timestamp (), forced_stop);
+ data->total_time += (sgen_timestamp () - last_start);
+ binary_protocol_worker_finish_stats (data - &context->workers_data [0] + 1, context->generation, context->forced_stop, data->major_scan_time, data->los_scan_time, data->total_time);
sgen_gray_object_queue_trim_free_list (&data->private_gray_queue);
+ return;
+
+work_available:
+ mono_os_mutex_unlock (&context->finished_lock);
}
void
-sgen_workers_enqueue_job (SgenThreadPoolJob *job, gboolean enqueue)
+sgen_workers_enqueue_job (int generation, SgenThreadPoolJob *job, gboolean enqueue)
{
if (!enqueue) {
job->func (NULL, job);
return;
}
- sgen_thread_pool_job_enqueue (job);
+ sgen_thread_pool_job_enqueue (worker_contexts [generation].thread_pool_context, job);
}
-void
-sgen_workers_wait_for_jobs_finished (void)
+static gboolean
+workers_get_work (WorkerData *data)
{
- sgen_thread_pool_wait_for_all_jobs ();
- /*
- * If the idle task was never triggered or it finished before the last job did and
- * then didn't get triggered again, we might end up in the situation of having
- * something in the gray queue yet the idle task not working. The easiest way to
- * make sure this doesn't stay that way is to just trigger it again after all jobs
- * have finished.
- */
- sgen_workers_ensure_awake ();
+ 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);
+
+ section = sgen_section_gray_queue_dequeue (&data->context->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 */
+ g_assert (sgen_gray_object_queue_is_empty (&data->private_gray_queue));
+ return FALSE;
}
static gboolean
-workers_get_work (WorkerData *data)
+workers_steal_work (WorkerData *data)
{
- SgenMajorCollector *major;
+ SgenMajorCollector *major = sgen_get_major_collector ();
+ SgenMinorCollector *minor = sgen_get_minor_collector ();
+ int generation = sgen_get_current_collection_generation ();
+ GrayQueueSection *section = NULL;
+ WorkerContext *context = data->context;
+ int i, current_worker;
+
+ 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 */
g_assert (sgen_gray_object_queue_is_empty (&data->private_gray_queue));
- /* 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);
- return TRUE;
- }
+ current_worker = (int) (data - context->workers_data);
+
+ for (i = 1; i < context->active_workers_num && !section; i++) {
+ int steal_worker = (current_worker + i) % context->active_workers_num;
+ if (state_is_working_or_enqueued (context->workers_data [steal_worker].state))
+ section = sgen_gray_object_steal_section (&context->workers_data [steal_worker].private_gray_queue);
+ }
+
+ if (section) {
+ sgen_gray_object_enqueue_section (&data->private_gray_queue, section, TRUE);
+ return TRUE;
}
/* Nobody to steal from */
{
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);
+
+ /* Separate WorkerData for same thread share free_block_lists */
+ if (major->is_parallel || minor->is_parallel)
+ major->init_block_free_lists (&data->free_block_lists);
}
static gboolean
-continue_idle_func (void)
+sgen_workers_are_working (WorkerContext *context)
{
- return state_is_working_or_enqueued (workers_state);
+ int i;
+
+ for (i = 0; i < context->active_workers_num; i++) {
+ if (state_is_working_or_enqueued (context->workers_data [i].state))
+ return TRUE;
+ }
+ return FALSE;
+}
+
+static gboolean
+continue_idle_func (void *data_untyped, int thread_pool_context)
+{
+ if (data_untyped)
+ return state_is_working_or_enqueued (((WorkerData*)data_untyped)->state);
+
+ /* Return if any of the threads is working in the context */
+ if (worker_contexts [GENERATION_NURSERY].workers_num && worker_contexts [GENERATION_NURSERY].thread_pool_context == thread_pool_context)
+ return sgen_workers_are_working (&worker_contexts [GENERATION_NURSERY]);
+ if (worker_contexts [GENERATION_OLD].workers_num && worker_contexts [GENERATION_OLD].thread_pool_context == thread_pool_context)
+ return sgen_workers_are_working (&worker_contexts [GENERATION_OLD]);
+
+ g_assert_not_reached ();
+ return FALSE;
+}
+
+static gboolean
+should_work_func (void *data_untyped)
+{
+ WorkerData *data = (WorkerData*)data_untyped;
+ WorkerContext *context = data->context;
+ int current_worker = (int) (data - context->workers_data);
+
+ return context->started && current_worker < context->active_workers_num && state_is_working_or_enqueued (data->state);
}
static void
marker_idle_func (void *data_untyped)
{
WorkerData *data = (WorkerData *)data_untyped;
+ WorkerContext *context = data->context;
- SGEN_ASSERT (0, continue_idle_func (), "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.");
+ SGEN_ASSERT (0, continue_idle_func (data_untyped, context->thread_pool_context), "Why are we called when we're not supposed to work?");
- if (workers_state == STATE_WORK_ENQUEUED) {
- set_state (STATE_WORK_ENQUEUED, STATE_WORKING);
- SGEN_ASSERT (0, workers_state != STATE_NOT_WORKING, "How did we get from WORK ENQUEUED to NOT WORKING?");
+ if (data->state == STATE_WORK_ENQUEUED) {
+ set_state (data, STATE_WORK_ENQUEUED, STATE_WORKING);
+ SGEN_ASSERT (0, data->state != STATE_NOT_WORKING, "How did we get from WORK ENQUEUED to NOT WORKING?");
}
- if (!forced_stop && (!sgen_gray_object_queue_is_empty (&data->private_gray_queue) || workers_get_work (data))) {
- ScanCopyContext ctx = CONTEXT_FROM_OBJECT_OPERATIONS (idle_func_object_ops, &data->private_gray_queue);
+ if (!context->forced_stop && (!sgen_gray_object_queue_is_empty (&data->private_gray_queue) || workers_get_work (data) || workers_steal_work (data))) {
+ ScanCopyContext ctx = CONTEXT_FROM_OBJECT_OPERATIONS (context->idle_func_object_ops, &data->private_gray_queue);
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);
- } else {
- SgenThreadPoolJob *job = preclean_job;
- if (job) {
- sgen_thread_pool_job_enqueue (job);
- preclean_job = NULL;
- } else {
- worker_try_finish (data);
+
+ if (data->private_gray_queue.num_sections >= SGEN_WORKER_MIN_SECTIONS_SIGNAL
+ && context->workers_finished && context->worker_awakenings < context->active_workers_num) {
+ /* We bound the number of worker awakenings just to be sure */
+ context->worker_awakenings++;
+ mono_os_mutex_lock (&context->finished_lock);
+ sgen_workers_ensure_awake (context);
+ mono_os_mutex_unlock (&context->finished_lock);
}
+ } else {
+ worker_try_finish (data);
}
}
static void
-init_distribute_gray_queue (void)
+init_distribute_gray_queue (WorkerContext *context)
{
- if (workers_distribute_gray_queue_inited) {
- g_assert (sgen_section_gray_queue_is_empty (&workers_distribute_gray_queue));
- g_assert (workers_distribute_gray_queue.locked);
- return;
- }
-
- sgen_section_gray_queue_init (&workers_distribute_gray_queue, TRUE,
+ sgen_section_gray_queue_init (&context->workers_distribute_gray_queue, TRUE,
sgen_get_major_collector ()->is_concurrent ? concurrent_enqueue_check : NULL);
- workers_distribute_gray_queue_inited = TRUE;
}
void
-sgen_workers_init_distribute_gray_queue (void)
+sgen_workers_create_context (int generation, int num_workers)
{
- SGEN_ASSERT (0, sgen_get_major_collector ()->is_concurrent,
- "Why should we init the distribute gray queue if we don't need it?");
- init_distribute_gray_queue ();
+ static gboolean stat_inited = FALSE;
+ int i;
+ WorkerData **workers_data_ptrs = (WorkerData**)sgen_alloc_internal_dynamic (num_workers * sizeof(WorkerData*), INTERNAL_MEM_WORKER_DATA, TRUE);
+ WorkerContext *context = &worker_contexts [generation];
+
+ SGEN_ASSERT (0, !context->workers_num, "We can't init the worker context for a generation twice");
+
+ mono_os_mutex_init (&context->finished_lock);
+
+ context->generation = generation;
+ context->workers_num = num_workers;
+ context->active_workers_num = num_workers;
+
+ context->workers_data = (WorkerData *)sgen_alloc_internal_dynamic (sizeof (WorkerData) * num_workers, INTERNAL_MEM_WORKER_DATA, TRUE);
+ memset (context->workers_data, 0, sizeof (WorkerData) * num_workers);
+
+ init_distribute_gray_queue (context);
+
+ for (i = 0; i < num_workers; ++i) {
+ workers_data_ptrs [i] = &context->workers_data [i];
+ context->workers_data [i].context = context;
+ }
+
+ context->thread_pool_context = sgen_thread_pool_create_context (num_workers, thread_pool_init_func, marker_idle_func, continue_idle_func, should_work_func, (void**)workers_data_ptrs);
+
+ if (!stat_inited) {
+ mono_counters_register ("# workers finished", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_workers_num_finished);
+ stat_inited = TRUE;
+ }
}
-void
-sgen_workers_init (int num_workers)
+/* This is called with thread pool lock so no context switch can happen */
+static gboolean
+continue_idle_wait (int calling_context, int *threads_context)
{
+ WorkerContext *context;
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;
+ if (worker_contexts [GENERATION_OLD].workers_num && calling_context == worker_contexts [GENERATION_OLD].thread_pool_context)
+ context = &worker_contexts [GENERATION_OLD];
+ else if (worker_contexts [GENERATION_NURSERY].workers_num && calling_context == worker_contexts [GENERATION_NURSERY].thread_pool_context)
+ context = &worker_contexts [GENERATION_NURSERY];
+ else
+ g_assert_not_reached ();
+
+ /*
+ * We assume there are no pending jobs, since this is called only after
+ * we waited for all the jobs.
+ */
+ for (i = 0; i < context->active_workers_num; i++) {
+ if (threads_context [i] == calling_context)
+ return TRUE;
}
- //g_print ("initing %d workers\n", num_workers);
+ if (sgen_workers_have_idle_work (context->generation) && !context->forced_stop)
+ return TRUE;
- workers_num = num_workers;
+ /*
+ * At this point there are no jobs to be done, and no objects to be scanned
+ * in the gray queues. We can simply asynchronously finish all the workers
+ * from the context that were not finished already (due to being stuck working
+ * in another context)
+ */
- workers_data = (WorkerData *)sgen_alloc_internal_dynamic (sizeof (WorkerData) * num_workers, INTERNAL_MEM_WORKER_DATA, TRUE);
- memset (workers_data, 0, sizeof (WorkerData) * num_workers);
+ for (i = 0; i < context->active_workers_num; i++) {
+ if (context->workers_data [i].state == STATE_WORK_ENQUEUED)
+ set_state (&context->workers_data [i], STATE_WORK_ENQUEUED, STATE_WORKING);
+ if (context->workers_data [i].state == STATE_WORKING)
+ worker_try_finish (&context->workers_data [i]);
+ }
- init_distribute_gray_queue ();
+ return FALSE;
+}
+
+
+void
+sgen_workers_stop_all_workers (int generation)
+{
+ WorkerContext *context = &worker_contexts [generation];
- for (i = 0; i < workers_num; ++i)
- workers_data_ptrs [i] = (void *) &workers_data [i];
+ mono_os_mutex_lock (&context->finished_lock);
+ context->finish_callback = NULL;
+ mono_os_mutex_unlock (&context->finished_lock);
- sgen_thread_pool_init (num_workers, thread_pool_init_func, marker_idle_func, continue_idle_func, workers_data_ptrs);
+ context->forced_stop = TRUE;
- mono_counters_register ("# workers finished", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_workers_num_finished);
+ sgen_thread_pool_wait_for_all_jobs (context->thread_pool_context);
+ sgen_thread_pool_idle_wait (context->thread_pool_context, continue_idle_wait);
+ SGEN_ASSERT (0, !sgen_workers_are_working (context), "Can only signal enqueue work when in no work state");
+
+ context->started = FALSE;
}
void
-sgen_workers_stop_all_workers (void)
+sgen_workers_set_num_active_workers (int generation, int num_workers)
{
- preclean_job = NULL;
- mono_memory_write_barrier ();
- forced_stop = TRUE;
-
- sgen_thread_pool_wait_for_all_jobs ();
- sgen_thread_pool_idle_wait ();
- SGEN_ASSERT (0, workers_state == STATE_NOT_WORKING, "Can only signal enqueue work when in no work state");
+ WorkerContext *context = &worker_contexts [generation];
+ if (num_workers) {
+ SGEN_ASSERT (0, num_workers <= context->workers_num, "We can't start more workers than we initialized");
+ context->active_workers_num = num_workers;
+ } else {
+ context->active_workers_num = context->workers_num;
+ }
}
void
-sgen_workers_start_all_workers (SgenObjectOperations *object_ops, SgenThreadPoolJob *job)
+sgen_workers_start_all_workers (int generation, SgenObjectOperations *object_ops_nopar, SgenObjectOperations *object_ops_par, SgenWorkersFinishCallback callback)
{
- forced_stop = FALSE;
- idle_func_object_ops = object_ops;
- preclean_job = job;
+ WorkerContext *context = &worker_contexts [generation];
+ int i;
+ SGEN_ASSERT (0, !context->started, "Why are we starting to work without finishing previous cycle");
+
+ context->idle_func_object_ops_par = object_ops_par;
+ context->idle_func_object_ops_nopar = object_ops_nopar;
+ context->forced_stop = FALSE;
+ context->finish_callback = callback;
+ context->worker_awakenings = 0;
+ context->started = TRUE;
+
+ for (i = 0; i < context->active_workers_num; i++) {
+ context->workers_data [i].major_scan_time = 0;
+ context->workers_data [i].los_scan_time = 0;
+ context->workers_data [i].total_time = 0;
+ context->workers_data [i].last_start = 0;
+ }
mono_memory_write_barrier ();
- sgen_workers_ensure_awake ();
+ /*
+ * 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 (&context->finished_lock);
+ sgen_workers_ensure_awake (context);
+ mono_os_mutex_unlock (&context->finished_lock);
}
void
-sgen_workers_join (void)
+sgen_workers_join (int generation)
{
+ WorkerContext *context = &worker_contexts [generation];
int i;
- sgen_thread_pool_wait_for_all_jobs ();
- sgen_thread_pool_idle_wait ();
- SGEN_ASSERT (0, workers_state == STATE_NOT_WORKING, "Can only signal enqueue work when in no work state");
+ SGEN_ASSERT (0, !context->finish_callback, "Why are we joining concurrent mark early");
+
+ sgen_thread_pool_wait_for_all_jobs (context->thread_pool_context);
+ sgen_thread_pool_idle_wait (context->thread_pool_context, continue_idle_wait);
+ SGEN_ASSERT (0, !sgen_workers_are_working (context), "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)
- SGEN_ASSERT (0, sgen_gray_object_queue_is_empty (&workers_data [i].private_gray_queue), "Why is there still work left to do?");
+ SGEN_ASSERT (0, sgen_section_gray_queue_is_empty (&context->workers_distribute_gray_queue), "Why is there still work left to do?");
+ for (i = 0; i < context->active_workers_num; ++i)
+ SGEN_ASSERT (0, sgen_gray_object_queue_is_empty (&context->workers_data [i].private_gray_queue), "Why is there still work left to do?");
+
+ context->started = FALSE;
}
/*
- * Can only be called if the workers are stopped.
- * If we're stopped, there are also no pending jobs.
+ * Can only be called if the workers are not working in the
+ * context and there are no pending jobs.
*/
gboolean
-sgen_workers_have_idle_work (void)
+sgen_workers_have_idle_work (int generation)
{
+ WorkerContext *context = &worker_contexts [generation];
int i;
- SGEN_ASSERT (0, forced_stop && sgen_workers_all_done (), "Checking for idle work should only happen if the workers are stopped.");
-
- if (!sgen_section_gray_queue_is_empty (&workers_distribute_gray_queue))
+ if (!sgen_section_gray_queue_is_empty (&context->workers_distribute_gray_queue))
return TRUE;
- for (i = 0; i < workers_num; ++i) {
- if (!sgen_gray_object_queue_is_empty (&workers_data [i].private_gray_queue))
+ for (i = 0; i < context->active_workers_num; ++i) {
+ if (!sgen_gray_object_queue_is_empty (&context->workers_data [i].private_gray_queue))
return TRUE;
}
gboolean
sgen_workers_all_done (void)
{
- return workers_state == STATE_NOT_WORKING;
-}
+ if (worker_contexts [GENERATION_NURSERY].workers_num && sgen_workers_are_working (&worker_contexts [GENERATION_NURSERY]))
+ return FALSE;
+ if (worker_contexts [GENERATION_OLD].workers_num && sgen_workers_are_working (&worker_contexts [GENERATION_OLD]))
+ return FALSE;
-/* Must only be used for debugging */
-gboolean
-sgen_workers_are_working (void)
-{
- return state_is_working_or_enqueued (workers_state);
+ return TRUE;
}
void
-sgen_workers_assert_gray_queue_is_empty (void)
+sgen_workers_assert_gray_queue_is_empty (int generation)
{
- SGEN_ASSERT (0, sgen_section_gray_queue_is_empty (&workers_distribute_gray_queue), "Why is the workers gray queue not empty?");
+ SGEN_ASSERT (0, sgen_section_gray_queue_is_empty (&worker_contexts [generation].workers_distribute_gray_queue), "Why is the workers gray queue not empty?");
}
void
-sgen_workers_take_from_queue_and_awake (SgenGrayQueue *queue)
+sgen_workers_take_from_queue (int generation, SgenGrayQueue *queue)
{
- gboolean wake = FALSE;
+ WorkerContext *context = &worker_contexts [generation];
+
+ sgen_gray_object_spread (queue, sgen_workers_get_job_split_count (generation));
for (;;) {
GrayQueueSection *section = sgen_gray_object_dequeue_section (queue);
if (!section)
break;
- sgen_section_gray_queue_enqueue (&workers_distribute_gray_queue, section);
- wake = TRUE;
+ sgen_section_gray_queue_enqueue (&context->workers_distribute_gray_queue, section);
}
- if (wake) {
- SGEN_ASSERT (0, sgen_concurrent_collection_in_progress (), "Why is there work to take when there's no concurrent collection in progress?");
- sgen_workers_ensure_awake ();
- }
+ SGEN_ASSERT (0, !sgen_workers_are_working (context), "We should fully populate the distribute gray queue before we start the workers");
+}
+
+SgenObjectOperations*
+sgen_workers_get_idle_func_object_ops (WorkerData *worker)
+{
+ g_assert (worker->context->idle_func_object_ops);
+ return worker->context->idle_func_object_ops;
+}
+
+/*
+ * If we have a single worker, splitting into multiple jobs makes no sense. With
+ * more than one worker, we split into a larger number of jobs so that, in case
+ * the work load is uneven, a worker that finished quickly can take up more jobs
+ * than another one.
+ *
+ * We also return 1 if there is no worker context for that generation.
+ */
+int
+sgen_workers_get_job_split_count (int generation)
+{
+ return (worker_contexts [generation].active_workers_num > 1) ? worker_contexts [generation].active_workers_num * 4 : 1;
+}
+
+void
+sgen_workers_foreach (int generation, SgenWorkerCallback callback)
+{
+ WorkerContext *context = &worker_contexts [generation];
+ int i;
+
+ for (i = 0; i < context->workers_num; i++)
+ callback (&context->workers_data [i]);
+}
+
+gboolean
+sgen_workers_is_worker_thread (MonoNativeThreadId id)
+{
+ return sgen_thread_pool_is_thread_pool_thread (id);
}
#endif
projects / mono.git / blobdiff