Add Chromium-only Blender WebEngine parity work

blender-5.2.0/intern/cycles/util/task.cpp

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+/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
+ *
+ * SPDX-License-Identifier: Apache-2.0 */
+
+#include "util/task.h"
+
+#include "util/log.h"
+#include "util/time.h"
+
+CCL_NAMESPACE_BEGIN
+
+/* Task Pool */
+
+TaskPool::TaskPool() : start_time(time_dt()), num_tasks_pushed(0) {}
+
+TaskPool::~TaskPool()
+{
+  cancel();
+}
+
+void TaskPool::push(TaskRunFunction &&task)
+{
+  tbb_group.run(std::move(task));
+  num_tasks_pushed++;
+}
+
+void TaskPool::wait_work(Summary *stats)
+{
+  tbb_group.wait();
+
+  if (stats != nullptr) {
+    stats->time_total = time_dt() - start_time;
+    stats->num_tasks_handled = num_tasks_pushed;
+  }
+
+  num_tasks_pushed = 0;
+}
+
+void TaskPool::cancel()
+{
+  if (num_tasks_pushed > 0) {
+    tbb_group.cancel();
+    tbb_group.wait();
+    num_tasks_pushed = 0;
+  }
+}
+
+bool TaskPool::canceled()
+{
+  return tbb::is_current_task_group_canceling();
+}
+
+/* Task Scheduler */
+
+thread_mutex TaskScheduler::mutex;
+int TaskScheduler::users = 0;
+int TaskScheduler::active_num_threads = 0;
+unique_ptr<tbb::global_control> TaskScheduler::global_control;
+
+void TaskScheduler::init(const int num_threads)
+{
+  const thread_scoped_lock lock(mutex);
+  /* Multiple cycles instances can use this task scheduler, sharing the same
+   * threads, so we keep track of the number of users. */
+  ++users;
+  if (users != 1) {
+    return;
+  }
+  if (num_threads > 0) {
+    /* Automatic number of threads. */
+    LOG_INFO << "Overriding number of TBB threads to " << num_threads << ".";
+    global_control = make_unique<tbb::global_control>(tbb::global_control::max_allowed_parallelism,
+                                                      num_threads);
+    active_num_threads = num_threads;
+  }
+  else {
+    active_num_threads = tbb::this_task_arena::max_concurrency();
+  }
+}
+
+void TaskScheduler::exit()
+{
+  const thread_scoped_lock lock(mutex);
+  users--;
+  if (users == 0) {
+    global_control.reset();
+    active_num_threads = 0;
+  }
+}
+
+void TaskScheduler::free_memory()
+{
+  assert(users == 0);
+}
+
+int TaskScheduler::max_concurrency()
+{
+  const thread_scoped_lock lock(mutex);
+  return (users > 0) ? active_num_threads : tbb::this_task_arena::max_concurrency();
+}
+
+/* Dedicated Task Pool */
+
+DedicatedTaskPool::DedicatedTaskPool()
+{
+  do_cancel = false;
+  do_exit = false;
+  num = 0;
+
+  worker_thread = make_unique<thread>([this] { thread_run(); });
+}
+
+DedicatedTaskPool::~DedicatedTaskPool()
+{
+  wait();
+
+  do_exit = true;
+  queue_cond.notify_all();
+
+  worker_thread->join();
+  worker_thread.reset();
+}
+
+void DedicatedTaskPool::push(TaskRunFunction &&run, bool front)
+{
+  num_increase();
+
+  /* add task to queue */
+  queue_mutex.lock();
+  if (front) {
+    queue.emplace_front(std::move(run));
+  }
+  else {
+    queue.emplace_back(std::move(run));
+  }
+
+  queue_cond.notify_one();
+  queue_mutex.unlock();
+}
+
+void DedicatedTaskPool::wait()
+{
+  thread_scoped_lock num_lock(num_mutex);
+
+  while (num) {
+    num_cond.wait(num_lock);
+  }
+}
+
+void DedicatedTaskPool::cancel()
+{
+  do_cancel = true;
+
+  clear();
+  wait();
+
+  do_cancel = false;
+}
+
+bool DedicatedTaskPool::canceled()
+{
+  return do_cancel;
+}
+
+void DedicatedTaskPool::num_decrease(const int done)
+{
+  const thread_scoped_lock num_lock(num_mutex);
+  num -= done;
+
+  assert(num >= 0);
+  if (num == 0) {
+    num_cond.notify_all();
+  }
+}
+
+void DedicatedTaskPool::num_increase()
+{
+  const thread_scoped_lock num_lock(num_mutex);
+  num++;
+  num_cond.notify_all();
+}
+
+bool DedicatedTaskPool::thread_wait_pop(TaskRunFunction &task)
+{
+  thread_scoped_lock queue_lock(queue_mutex);
+
+  while (queue.empty() && !do_exit) {
+    queue_cond.wait(queue_lock);
+  }
+
+  if (queue.empty()) {
+    assert(do_exit);
+    return false;
+  }
+
+  task = queue.front();
+  queue.pop_front();
+
+  return true;
+}
+
+void DedicatedTaskPool::thread_run()
+{
+  TaskRunFunction task;
+
+  /* keep popping off tasks */
+  while (thread_wait_pop(task)) {
+    /* run task */
+    task();
+
+    /* delete task */
+    task = nullptr;
+
+    /* notify task was done */
+    num_decrease(1);
+  }
+}
+
+void DedicatedTaskPool::clear()
+{
+  thread_scoped_lock queue_lock(queue_mutex);
+
+  /* erase all tasks from the queue */
+  const int done = queue.size();
+  queue.clear();
+
+  queue_lock.unlock();
+
+  /* notify done */
+  num_decrease(done);
+}
+
+string TaskPool::Summary::full_report() const
+{
+  string report;
+  report += string_printf("Total time:    %f\n", time_total);
+  report += string_printf("Tasks handled: %d", num_tasks_handled);
+  return report;
+}
+
+CCL_NAMESPACE_END