mono/sgen/sgen-workers.h

   1 /**
   2  * \file
   3  * Worker threads for parallel and concurrent GC.
   4  *
   5  * Copyright 2011 Xamarin Inc (http://www.xamarin.com)
   6  * Copyright (C) 2012 Xamarin Inc
   7  *
   8  * Licensed under the MIT license. See LICENSE file in the project root for full license information.
   9  */
  10
  11 #ifndef __MONO_SGEN_WORKER_H__
  12 #define __MONO_SGEN_WORKER_H__
  13
  14 #include "mono/sgen/sgen-thread-pool.h"
  15
  16 typedef struct _WorkerData WorkerData;
  17 typedef struct _WorkerContext WorkerContext;
  18
  19 typedef gint32 State;
  20
  21 typedef void (*SgenWorkersFinishCallback) (void);
  22 typedef void (*SgenWorkerCallback) (WorkerData *data);
  23
  24 struct _WorkerData {
  25         gint32 state;
  26         SgenGrayQueue private_gray_queue; /* only read/written by worker thread */
  27         /*
  28          * Workers allocate major objects only from here. It has same structure as the
  29          * global one. This is normally accessed from the worker_block_free_list_key.
  30          * We hold it here so we can clear free lists from all threads before sweep
  31          * starts.
  32          */
  33         gpointer free_block_lists;
  34         WorkerContext *context;
  35
  36         /* Work time distribution. Measured in ticks. */
  37         gint64 major_scan_time, los_scan_time, total_time;
  38         /*
  39          * When changing the state of the worker from not working to work enqueued
  40          * we set the timestamp so we can compute for how long the worker did actual
  41          * work during the phase
  42          */
  43         gint64 last_start;
  44 };
  45
  46 struct _WorkerContext {
  47         int workers_num;
  48         int active_workers_num;
  49         volatile gboolean started;
  50         volatile gboolean forced_stop;
  51         WorkerData *workers_data;
  52
  53         /*
  54          * When using multiple workers, we need to have the last worker
  55          * enqueue the preclean jobs (if there are any). This lock ensures
  56          * that when the last worker takes it, all the other workers have
  57          * gracefully finished, so it can restart them.
  58          */
  59         mono_mutex_t finished_lock;
  60         volatile gboolean workers_finished;
  61         int worker_awakenings;
  62
  63         SgenSectionGrayQueue workers_distribute_gray_queue;
  64
  65         SgenObjectOperations * volatile idle_func_object_ops;
  66         SgenObjectOperations *idle_func_object_ops_par, *idle_func_object_ops_nopar;
  67
  68         /*
  69          * finished_callback is called only when the workers finish work normally (when they
  70          * are not forced to finish). The callback is used to enqueue preclean jobs.
  71          */
  72         volatile SgenWorkersFinishCallback finish_callback;
  73
  74         int generation;
  75         int thread_pool_context;
  76 };
  77
  78 void sgen_workers_create_context (int generation, int num_workers);
  79 void sgen_workers_stop_all_workers (int generation);
  80 void sgen_workers_set_num_active_workers (int generation, int num_workers);
  81 void sgen_workers_start_all_workers (int generation, SgenObjectOperations *object_ops_nopar, SgenObjectOperations *object_ops_par, SgenWorkersFinishCallback finish_job);
  82 void sgen_workers_enqueue_job (int generation, SgenThreadPoolJob *job, gboolean enqueue);
  83 void sgen_workers_join (int generation);
  84 gboolean sgen_workers_have_idle_work (int generation);
  85 gboolean sgen_workers_all_done (void);
  86 void sgen_workers_assert_gray_queue_is_empty (int generation);
  87 void sgen_workers_take_from_queue (int generation, SgenGrayQueue *queue);
  88 SgenObjectOperations* sgen_workers_get_idle_func_object_ops (WorkerData *worker);
  89 int sgen_workers_get_job_split_count (int generation);
  90 int sgen_workers_get_active_worker_count (int generation);
  91 void sgen_workers_foreach (int generation, SgenWorkerCallback callback);
  92 gboolean sgen_workers_is_worker_thread (MonoNativeThreadId id);
  93
  94 #endif