Enables clean VM shutdown.

runtime/vm/thread_pool_test.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/os.h"
 #include "vm/lockers.h"
 #include "vm/thread_pool.h"
 #include "vm/unit_test.h"
 
 namespace dart {
 
 DECLARE_FLAG(int, worker_timeout_millis);
 
-
-class ThreadPoolTestPeer {
- public:
-  // When the pool has an exit monitor, workers notify a monitor just
-  // before they exit.  This is only used in tests to make sure that
-  // Shutdown works.
-  static void SetExitMonitor(Monitor* exit_monitor, int* exit_count) {
-    ThreadPool::exit_monitor_ = exit_monitor;
-    ThreadPool::exit_count_ = exit_count;
-  }
-};
-
-
-UNIT_TEST_CASE(ThreadPool_Create) {
-  ThreadPool thread_pool;
-}
-
-
 class TestTask : public ThreadPool::Task {
  public:
   TestTask(Monitor* sync, bool* done)
       : sync_(sync), done_(done) {
   }
 
   virtual void Run() {
     MonitorLocker ml(sync_);
     *done_ = true;
     ml.Notify();
   }
 
  private:
   Monitor* sync_;
   bool* done_;
 };
 
 
 UNIT_TEST_CASE(ThreadPool_RunOne) {
-  ThreadPool thread_pool;
+  ThreadPool::set_shutdown_timeout_fatal(false);
   Monitor sync;
   bool done = false;
-  thread_pool.Run(new TestTask(&sync, &done));
+  ThreadPool::Run(new TestTask(&sync, &done));
   {
     MonitorLocker ml(&sync);
     while (!done) {
       ml.Wait();
     }
   }
   EXPECT(done);
 
   // Do a sanity test on the worker stats.
-  EXPECT_EQ(1U, thread_pool.workers_started());
-  EXPECT_EQ(0U, thread_pool.workers_stopped());
+  EXPECT_LE(1U, ThreadPool::workers_started());
+  EXPECT_EQ(0U, ThreadPool::workers_stopped());
+  EXPECT(ThreadPool::Shutdown());
 }
 
 
 UNIT_TEST_CASE(ThreadPool_RunMany) {
+  ThreadPool::set_shutdown_timeout_fatal(false);
   const int kTaskCount = 100;
-  ThreadPool thread_pool;
   Monitor sync[kTaskCount];
   bool done[kTaskCount];
 
   for (int i = 0; i < kTaskCount; i++) {
     done[i] = false;
-    thread_pool.Run(new TestTask(&sync[i], &done[i]));
+    ThreadPool::Run(new TestTask(&sync[i], &done[i]));
   }
   for (int i = 0; i < kTaskCount; i++) {
     MonitorLocker ml(&sync[i]);
     while (!done[i]) {
       ml.Wait();
     }
     EXPECT(done[i]);
   }
+  EXPECT(ThreadPool::Shutdown());
 }
 
 
-class SleepTask : public ThreadPool::Task {
- public:
-  explicit SleepTask(int millis)
-      : millis_(millis) {
-  }
-
-  virtual void Run() {
-    OS::Sleep(millis_);
-  }
-
- private:
-  int millis_;
-};
-
-
-UNIT_TEST_CASE(ThreadPool_WorkerShutdown) {
-  Monitor exit_sync;
-  int exit_count = 0;
-  MonitorLocker ml(&exit_sync);
-
-  // Set up the ThreadPool so that workers notify before they exit.
-  ThreadPool* thread_pool = new ThreadPool();
-  ThreadPoolTestPeer::SetExitMonitor(&exit_sync, &exit_count);
-
-  // Run a single task.
-  thread_pool->Run(new SleepTask(2));
-
-  // Kill the thread pool.
-  delete thread_pool;
-  thread_pool = NULL;
-
-  // Wait for the workers to terminate.
-  while (exit_count == 0) {
-    ml.Wait();
-  }
-  EXPECT_EQ(1, exit_count);
-}
-
-
 UNIT_TEST_CASE(ThreadPool_WorkerTimeout) {
   // Adjust the worker timeout so that we timeout quickly.
   int saved_timeout = FLAG_worker_timeout_millis;
   FLAG_worker_timeout_millis = 1;
 
-  ThreadPool thread_pool;
-  EXPECT_EQ(0U, thread_pool.workers_started());
-  EXPECT_EQ(0U, thread_pool.workers_stopped());
+  ThreadPool::set_shutdown_timeout_fatal(false);
+  EXPECT_LE(0U, ThreadPool::workers_started());
+  EXPECT_EQ(0U, ThreadPool::workers_stopped());
 
   // Run a worker.
   Monitor sync;
   bool done = false;
-  thread_pool.Run(new TestTask(&sync, &done));
-  EXPECT_EQ(1U, thread_pool.workers_started());
-  EXPECT_EQ(0U, thread_pool.workers_stopped());
+  ThreadPool::Run(new TestTask(&sync, &done));
+  EXPECT_LE(1U, ThreadPool::workers_started());
+  EXPECT_EQ(0U, ThreadPool::workers_stopped());
   {
     MonitorLocker ml(&sync);
     while (!done) {
       ml.Wait();
     }
   }
   EXPECT(done);
 
   // Wait up to 5 seconds to see if a worker times out.
   const int kMaxWait = 5000;
   int waited = 0;
-  while (thread_pool.workers_stopped() == 0 && waited < kMaxWait) {
+  while (ThreadPool::workers_stopped() == 0 && waited < kMaxWait) {
     OS::Sleep(1);
     waited += 1;
   }
-  EXPECT_EQ(1U, thread_pool.workers_stopped());
+  EXPECT_LE(1U, ThreadPool::workers_stopped());
   FLAG_worker_timeout_millis = saved_timeout;
+
+  EXPECT(ThreadPool::Shutdown());
 }
 
 
 class SpawnTask : public ThreadPool::Task {
  public:
-  SpawnTask(ThreadPool* pool, Monitor* sync, int todo, int total, int* done)
-      : pool_(pool), sync_(sync), todo_(todo), total_(total), done_(done) {
+  SpawnTask(Monitor* sync, int todo, int total, int* done)
+      : sync_(sync), todo_(todo), total_(total), done_(done) {
   }
 
   virtual void Run() {
     todo_--;  // Subtract one for current task.
     int child_todo = todo_ / 2;
 
     // Spawn 0-2 children.
     if (todo_ > 0) {
-      pool_->Run(
-          new SpawnTask(pool_, sync_, todo_ - child_todo, total_, done_));
+      ThreadPool::Run(
+          new SpawnTask(sync_, todo_ - child_todo, total_, done_));
     }
     if (todo_ > 1) {
-      pool_->Run(
-          new SpawnTask(pool_, sync_, child_todo, total_, done_));
+      ThreadPool::Run(
+          new SpawnTask(sync_, child_todo, total_, done_));
     }
 
     {
       MonitorLocker ml(sync_);
       (*done_)++;
       if (*done_ >= total_) {
         ml.Notify();
       }
     }
   }
 
  private:
-  ThreadPool* pool_;
   Monitor* sync_;
   int todo_;
   int total_;
   int* done_;
 };
 
 
 UNIT_TEST_CASE(ThreadPool_RecursiveSpawn) {
-  ThreadPool thread_pool;
+  ThreadPool::set_shutdown_timeout_fatal(false);
   Monitor sync;
   const int kTotalTasks = 500;
   int done = 0;
-  thread_pool.Run(
-      new SpawnTask(&thread_pool, &sync, kTotalTasks, kTotalTasks, &done));
+  ThreadPool::Run(
+      new SpawnTask(&sync, kTotalTasks, kTotalTasks, &done));
   {
     MonitorLocker ml(&sync);
     while (done < kTotalTasks) {
       ml.Wait();
     }
   }
   EXPECT_EQ(kTotalTasks, done);
+  EXPECT(ThreadPool::Shutdown());
 }
 
 
+class SleepTask : public ThreadPool::Task {
+ public:
+  SleepTask(Monitor* sync, int millis)
+      : sync_(sync), millis_(millis) {
+  }
+
+  virtual void Run() {
+    {
+      MonitorLocker ml(sync_);
+      ml.Notify();
+    }
+    OS::Sleep(millis_);
+  }
+
+ private:
+  Monitor* sync_;
+  int millis_;
+};
+
+
+UNIT_TEST_CASE(ThreadPool_ShutdownTimeout) {
+  ThreadPool::set_shutdown_timeout_fatal(false);
+  Monitor sync;
+  ThreadPool::Run(new SleepTask(&sync, 15000));
+  {
+    MonitorLocker ml(&sync);
+    ml.Wait();
+  }
+  EXPECT(!ThreadPool::Shutdown());
+}
+
+
 }  // namespace dart